Digital broadcast receiving apparatus

A tuner part 101 for receiving broadcast waves of a channel specified, a key operation part 111 including plural channel selection buttons B corresponding to channels, and a control part 116 for performing control so as to be able to visually distinguish a channel selection button B corresponding to a channel capable of being received by the tuner part 101 from other channel selection buttons B among the plurality of channel selection buttons B are provided, so that notification of a receivable channel can be provided surely.

TECHNICAL FIELD

The present invention relates to a digital broadcast receiving apparatus such as a mobile telephone or a PDA (Personal digital assistant) capable of receiving digital broadcasting.

BACKGROUND ART

In recent years, a technique for incorporating a television tuner in a mobile telephone device has been known (for example, see JP-A-2002-9920).

Also, in a terrestrial digital method or satellite digital broadcasting, broadcasting using a transmission band of 1 or 3 segments, mainly for a small receiver with high portability, is scheduled.Patent Reference 1: JP-A-2002-9920

DISCLOSURE OF THE INVENTION

Problems that the Invention is to Solve

However, in terrestrial digital broadcasting, the sending and receiving performance depends on geographical conditions such as a landform. Depending on an area, radio waves of the same channel are received from separate broadcast stations, so that phenomena in which, for example, a reception screen is distorted due to interference occur. Therefore, radio waves are sent by assigning different channels (frequencies) to each of the broadcast stations according to a location, so that interference does not occur.

The occurrence of interference can thus be prevented, but such a broadcast system is unsuitable for mobility which is a basic property of a portable terminal. For example, in the area visited for the first time, reception channels of television broadcasting or radio broadcasting are not known, so that a program which a user wants to view may be missed.

As a result of this, a digital broadcast-receiving apparatus capable of surely providing notification of a receivable channel is desired.

The invention has been implemented in view of such circumstances, and an object of the invention is to provide a digital broadcast receiving apparatus capable of surely providing notification of a receivable channel.

Means for Solving the Problems

The gist of a digital broadcast receiving apparatus of the invention for solving the problems described above is in the following (1) to (7).

(1) A digital broadcast receiving apparatus comprising:

a receiver for receiving broadcast waves of specified channels,

a plurality of channel selection buttons corresponding to the channels, and

a control portion for controlling so as to be able to visually distinguish channel selection buttons corresponding to channels capable of being received by the receiver from other channel selection buttons among the plurality of channel selection buttons.

(2) The digital broadcast receiving apparatus comprising:

light emitting portions provided in correspondence with the channel selection buttons,

wherein the control portion makes the light emitting portions emit light to illuminate the channel selection buttons corresponding to the channels capable of being received by the receiver.

(3) The digital broadcast receiving apparatus comprising:

a display portion,

wherein the control portion controls so as to be able to visually distinguish a channel selection button corresponding to a channel being displayed on the display portion from the other channel selection buttons, among the channel selection buttons corresponding to the channels capable of being received by the receiver.
(4) The digital broadcast receiving apparatus comprising:

a detection portion for detecting a change of a reception area,

wherein when the detection portion detects the change, the control portion makes the light emitting portions of the channel selection buttons corresponding to channels capable of being received by the receiver in the changed area emit light.

(5) In the digital broadcast receiving apparatus, when a channel scan for detecting the channels capable of being received by the receiver is executed, the control portion makes the display portion display the channels capable of being received by the receiver and information related to broadcast stations of the channels in association with each other:
(6) In the digital broadcast receiving apparatus, the control portion makes the light emitting portion corresponding to the channel emit light at a light emission intensity in response to a reception state of the broadcast waves of each of the channels by the receiver.
(7) In the digital broadcast receiving apparatus, the light emitting portions emit light in a plurality of different colors, and

the control portion makes the light emitting portion corresponding to the channel emit light in a color that corresponds to the reception state of the broadcast waves of each of the channels by the receiver.

Effect of the Invention

According to (1) to (7) described above, a digital broadcast receiving apparatus capable of surely providing notification of a receivable channel can be provided.

DESCRIPTION OF REFERENCE NUMERALS AND SIGNS

In addition, inFIGS. 1 to 11, numeral100is a digital broadcast receiving apparatus (mobile telephone), numeral101is a tuner part, numeral102is a demodulation part, numeral103is a demultiplexing part, numeral104is an image processing part, numeral105is a data processing part, numeral106is a sound processing part, numeral107is a channel scan part, numeral108is a display part, numeral109is a voice receiving part, numeral110is a voice transmitting part, numeral111is a communication part, numeral112is a key operation part, numeral113is a light emitting part, numeral114is a light emission adjusting part, numeral115is a memory, numeral116is a control part, and numeral117is an area detection part.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1is an overall diagram of a communication system1000in which a digital broadcast receiving apparatus according to a first embodiment of the invention is adopted.

A digital broadcast receiving apparatus100according to the present embodiment has a function of receiving digital broadcast waves of, for example, television broadcasting or radio broadcasting sent from a broadcast station1001or a relay station, and performs control so as to be able to visually distinguish a channel selection button corresponding to a receivable channel from the other channel selection buttons among the plurality of channel selection buttons.

For example, the digital broadcast receiving apparatus100performs control so that the light emitting portion emits light and a channel selection button corresponding to a receivable channel is illuminated to be visually distinguishable.

For example, the digital broadcast receiving apparatus is a digital broadcast receiving apparatus for a mobile unit such as a mobile telephone, a PDA and a car navigation apparatus.

A mobile telephone100will be described as the digital broadcast receiving apparatus in the present embodiment.

The mobile telephone100according to present embodiment will be described below with reference to the drawings.

FIG. 2is a functional block diagram showing one embodiment of the mobile telephone according to the invention.

The mobile telephone100has a tuner part101, a demodulation part102, a demultiplexing part103, an image processing part104, a data processing part105, a display part106, a sound processing part107, a voice receiving part108, a voice transmitting part109, a communication part110, a key operation part111, a light emitting part112, a light emission adjusting part113, a channel scan part114, memory115and a control part116as shown in, for example,FIG. 2.

The tuner part101and the demodulation part102correspond to one specific example of the receiver according to the invention.

The display part106corresponds to one example of the display portion according to the invention, and the key operation part111corresponds to one example of a channel selection button according to the invention, and the control part116corresponds to one example of the control portion according to the invention.

The tuner part101is constructed of, for example, a high-frequency circuit, a tuning circuit, a frequency conversion circuit, etc., and under the control of the control part116, broadcast waves of a specified channel (frequency) are received through an antenna ANT1and are converted into an intermediate frequency signal and the signal is outputted to the demodulation part102.

The demodulation part102is constructed of, for example, a demodulation circuit. Under the control of the control part116, predefined demodulation processing is performed with respect to a signal outputted from the tuner part101and the signal is outputted to the demultiplexing part103.

The demultiplexing part103performs predefined decoding processing, etc., with respect to a signal outputted from the demodulation part102, generates an image signal, a sound signal, a data signal, etc., and outputs the signals to the image processing part104, the data processing part105, the sound processing part107, the control part116, etc.

The image processing part104performs predetermined image processing with respect to an image signal outputted from the demultiplexing part103and displays a predetermined image on the display part106under the control of, for example, the control part116.

The data processing part105performs predetermined data processing with respect to a data signal outputted from the demultiplexing part103and performs predetermined display on the display part106under the control of, for example, the control part116.

The display part106is constructed of, for example, a display device such as an LCD (Liquid crystal display), a TFT (Thin Film Transistor) type LCD or a display unit, and performs display in response to an image signal or data under the control of the control part116.

An apparatus body1of the mobile telephone100has a first casing part11and a second casing part12as shown in, for example,FIG. 1. The first casing part11is foldably connected to the second casing part12by a folding part13.

The display part106is disposed in the center of the first casing part11of the apparatus body1as shown in, for example,FIG. 1.

The sound processing part107performs predetermined processing with respect to a signal outputted from the demultiplexing part103or the communication part110and outputs a sound signal to the voice receiving part108under the control of, for example, the control part116.

Also, the sound processing part107performs predetermined processing with respect to a sound signal outputted from the voice transmitting part109and outputs the sound signal to the control part116or the communication part110under the control of the control part116.

The voice receiving part108is constructed of, for example, a sound production device such as a speaker, and performs sound production in response to a sound signal from the sound processing part107.

The voice receiving part108is disposed in an upper portion of the first casing part11as shown in, for example,FIG. 1.

The voice transmitting part109outputs an electrical signal in response to the voice of, for example, a user to the sound processing part107or the communication part110.

The voice transmitting part109is disposed in a lower portion of the second casing part12as shown in, for example,FIG. 1.

The communication part110communicates with another digital broadcast receiving apparatus having a communication function or a base station through a wireless signal under the control of, for example, the control part116. The communication part110is constructed of, for example, a wireless reception part, a demodulation part, a decoding part, a digital-to-analog (D/A) conversion part, an analog-to-digital (A/D) conversion part, an encoding part, a modulation part and a wireless transmission part.

The communication part110converts a sound signal outputted from the voice transmitting part109into a wireless signal by a predefined method and outputs the signal to, for example, a base station through an antenna ANT2.

Also, the communication part110performs demodulation of a wireless signal received by the antenna ANT2by a predefined method, and generates a sound signal, an image signal, a data signal, etc., and outputs the signals to the control part116, the display part106, the voice receiving part108, etc.

The key operation part111outputs a signal in response to an operation of, for example, a user, to the control part116.

The key operation part111is disposed in the center of the second casing part12of the apparatus body1as shown in, for example,FIG. 1.

For example, in the present embodiment, the key operation part111has numeric buttons such as “1”, “2”, . . . , “9”, “0”, a “*” button, a “#” button, a directional button AB, a scan button SB, a lighting button RB, etc.

The key operation part111functions as a button for inputting telephone number assigned to a communication device of a communication destination when, for example, in a telephone mode.

Also, a part or all buttons of the plural buttons in the key operation part111function as plural channel selection buttons corresponding to channels, when, for example, in a digital broadcast receiving mode.

In the present embodiment, for example, of the buttons of the key operation part111, the “1” to “9” buttons respectively function as respective channel selection buttons of channels 1 to 9, the “*” button functions as a channel selection button of channel 10, the “0” button functions as a music selection button of channel 11, the “#” button functions as a channel selection button of channel 12, and the channel selection buttons corresponding to these channels are called buttons B.

The light emitting parts112are disposed in correspondence with, for example, each of the plural channel selection buttons of the key operation part111and emit light under the control of the control part116, and thereby illuminate the key operation part111including the channel selection buttons B.

For example, the light emitting part112is constructed of a light emitting device such as an LED (Light emitting diode) or an organic EL (electroluminescence) device.

Also, plural LEDs for emitting light by plural different colors may be disposed as the light emitting part112.

The light emission adjusting part113changes light emission intensity of the light emitting part112by controlling the amount of electric current supplied to the light emitting part112under the control of, for example, the control part116.

The light emission adjusting part113makes the light emitting part112emit light at a light emission intensity that corresponds to a reception state under the control of, for example, the control part116.

Also, the light emission adjusting part113makes the light emitting part112emit light in a color that corresponds to a reception state under the control of the control part116.

The channel scan part114controls a tuning circuit, etc., of the tuner part101and scans a receivable channel under the control of, for example, the control part116.

The memory115records user data, data such as channel information, a program (PRG), etc., and functions as work space of the processing of the control part116under the control of the control part116.

The memory115is comprised of, for example, ROM (Read only memory) or RAM (Random Access Memory).

The program (PRG) has, for example, a function according to the invention and the control part116implements the function according to the invention by execution.

The control part116performs centralized control of the entire apparatus.

For example, the control part116performs the control by executing the program (PRG) using the memory115as a workspace as described above. Description will be made below with a focus on functions according to the invention.

The control part116performs control so as to be able to visually distinguish a channel selection button B corresponding to a channel capable of being received by the tuner part101from the other channel selection buttons B among the plural channel selection buttons B.

Specifically, the control part116performs control so as to be able to visually distinguish a channel selection button B corresponding to a receivable channel from the other channel selection buttons B by emitting light of the light emitting part112and thereby illuminating the channel selection button B corresponding to the channel capable of being received by the tuner part101.

Also, the control part116performs control so as to be able to visually distinguish a channel selection button B corresponding to a channel displayed on the display part106from other channel selection buttons B, among the channel selection buttons B corresponding to the channels capable of being received by the tuner part101.

Specifically, the control part116performs the control visually distinguishably by, for example, blinking a channel selection button B corresponding to a channel displayed on the display part106among the channel selection buttons B corresponding to receivable channels, and lighting up the other channel selection buttons B. Also, the distinction may be made by color.

Also, the control part116makes the light emitting part112corresponding to the channel emit light at light emission intensity that corresponds to a reception state of broadcast waves of each of the channels by the tuner part101.

Specifically, the control part116makes the light emission adjusting part113control the amount of electric current supplied to the light emitting part112in response to a reception state.

For example, the amount of electric current is controlled so that light emission intensity of the light emitting part112increases for a good reception state and the light emission intensity decreases for a bad reception state.

Also, the control part116may make the light emitting part112emit light of a color corresponding to a reception state of broadcast waves of each of the channels by the tuner part101.

Specifically, the control part116makes, for example, the light emitting part112corresponding to a channel selection button B of a channel with a good reception state emit blue light, and makes the light emitting part112corresponding to a channel selection button B of a channel with a bad reception state emit red light. Also, the distinction may be made by lighting or blinking.

Also, when the control part116makes the channel scan part114execute a channel scan for detecting a channel capable of being received by the tuner part101, the control part116makes the light emitting part112emit light and makes the display part106perform display for associating the channel capable of being received by the tuner part101with a broadcast station of its channel.

That is, as described above, in the case of lighting up the light emitting parts112disposed in the channel selection buttons B corresponding to all the channels broadcast in the reception area (for the sake of simplicity, this is also called “lighting up the channel selection buttons B”), there are cases where a channel incapable of being viewed exists due to influence of a failure peculiar to the place in which a channel scan is executed even though it is lit up.

In such cases, the control part116effectively changes color of a lit LED (for example, a channel with a good reception state lights up blue and a channel with a bad reception state lights up red) or stepwise varies light emission intensity of lighting in response to a reception state as described above (for example, a channel with a good reception state emits light strongly and a channel with a bad reception state emits light weakly).

As a result of this, a user can distinguish a channel which is not broadcast from a channel which is broadcast but cannot be viewed due to a bad reception state.

In addition, the reception state described herein includes a concept reproduction quality including video/sound or electric field intensity of radio wave reception.

One specific example of an operation of the mobile telephone100will be described below.

FIG. 3is a flowchart describing an operation at the time of a channel scan of the mobile telephone shown inFIG. 1.

An operation of the case of starting a channel scan operation manually will be described with a focus on an operation of the control part116with reference toFIG. 3.

The control part116assigns a channel scan function to a particular key (for example, a scan button SB) among plural buttons of the key operation part111at the time of, for example, a viewing mode.

When the scan button SB of the key operation part111is operated in step ST1, the control part116acquires channel information from a broadcast station within the reception area and generates the channel information in step ST2. Otherwise, the processing is ended.

In step ST3, the control part116stores the acquired channel information into the memory115. The channel information includes, for example, a channel capable of being viewed in the acquired area and a button number corresponding to the channel (for example, A television and 1).

Specifically, in step ST4, the control part116performs control visually distinguishably by making the light emitting parts (LEDs)112disposed in correspondence with plural channel selection buttons B corresponding to viewable (receivable) channels light up and suppressing light emissions of the light emitting parts112disposed in correspondence with the other channel selection buttons B.

In step ST5, the control part116makes LED of the button of channel selection button B corresponding to the channel displayed on the display part106blink.

Also, another embodiment in which channel information is acquired and also a reception state in its position is considered will be shown below.

FIG. 4is a diagram showing one specific example of channel information that corresponds to a channel scan result of the mobile telephone shown inFIG. 1.

The control part116generates channel information DC based on a channel scan result as shown in, for example,FIG. 4. The channel information DC is recorded with, for example, a channel and the reception state of broadcast waves of its channel being associated with each other. For simple description, the case where a reception state is good is represented as a circle mark, and the case where a reception state is not good is represented as a triangle mark, and the case where reception cannot be performed is represented as a cross (X) mark.

In step ST3, the control part116stores the channel information DC into the memory115.

In step ST4, the control part116performs control so as to be able to visually distinguish a channel selection button B corresponding to a channel capable of being received by the tuner part101from the other channel selection buttons B among the plural channel selection buttons B, based on the channel information DC indicating the channel scan result.

Specifically, the control part116performs control so as to be able to visually distinguish, by lighting up the light emitting parts (LEDs)112disposed in correspondence with plural channel selection buttons B corresponding to viewable (receivable) channels and suppressing light emissions of the light emitting parts112disposed in correspondence with the other channel selection buttons B.

In step ST5, the control part116makes the LED of the button of channel selection button B corresponding to the channel displayed on the display part106blink.

Specifically, in step ST5, the control part116makes the tuner part101receive broadcast waves of a channel with the smallest number, for example, among the viewable channel numbers within a reception area in the present place based on a scan result, and makes the display part106display an image in response to contents data included in the broadcast waves of this channel, and blinks the light emitting part112disposed in a channel selection button B corresponding to this channel.

In addition, the present specific example assumes that the viewable channel is a channel actually received by a channel scan, but the control part116may recognize an area code from a broadcast station received by the tuner part101and light up channel selection buttons B corresponding to all the channels broadcast in the reception area.

FIG. 5is a flowchart describing an operation at the time of turning off a light emitting part (LED) of the mobile telephone shown inFIG. 1.

An operation of automatically turning off the light emitting part (LED)112will be described with a focus on an operation of the control part116with reference toFIG. 5.

In step ST11, the control part116causes the light emitting part (LED)112corresponding to a channel selection button B of a receivable channel based on channel information DC to light up.

In step ST12, using lighting of the LED112as a trigger, the control part116activates a lights-out timer which is a timer for measuring time for turning off the LED112after a lapse of a predetermined time from the start of its lighting.

In step ST13, the control part116determines whether or not a channel selection button B is operated. When the control part116decides that the channel selection button B is operated, the flowchart returns to processing of step ST12and the previous elapsed time of the lights-out timer is reset and timing is startedanew.

On the other hand, when the channel selection button B is determined to have been not operated in step ST13, the control part116determines whether or not a time-out has occurred. Specifically, the control part116determines whether or not a predetermined time, for example, several seconds have elapsed (ST14).

When it is determined that the time-out has not occurred in step ST14, the flowchart returns to processing of step ST13. When it is determined that the time-out has occurred, that is, the predetermined time has elapsed, light emission of the light emitting part (LED)112is suppressed (turned off).

Power consumption can be reduced by turning off the light emitting part (LED)112after a lapse of the predetermined time as described above.

Also, when the channel selection button continues to be operated repeatedly within a predetermined time, the light emitting part (LED)112continues to light up, so that, for example, even when a user wavers in channel selection, the light emitting part (LED)112continues to light up without turning off during channel selection.

FIG. 6is a diagram describing lighting and turning off operations of LEDs of channel selection buttons B of the mobile telephone shown inFIG. 1.

Next, a method for lighting up LEDs of channel selection buttons B as necessary when the light emitting part (LED)112have been turned off will be described with reference toFIG. 6.

This is a function that assumes, for example, the case where a user wants to know a viewed channel during viewing of television or the ease where a user wants to change a channel.

As shown inFIG. 6, in the key operation part111, a lighting button RB for controlling lighting and turning off of the light emitting part (LED)112is disposed in, for example, a lower right portion of the first casing part11of the apparatus1.

For example, when the lighting button RB is operated at the time of turning off the light emitting part (LED)112, the control part116makes the light emitting part112corresponding to a viewable channel light up and makes the light emitting part112corresponding to a channel viewed at present blink, based on channel information DC indicating a result of the previous channel scan recorded in the memory115.

In the present specific example, the “8” button is illuminated so as to be blinked by making the display part106display a viewable channel 8 and blinking the light emitting part112corresponding to this channel.

Even when a channel scan is again executed manually, the same state can be obtained, but by recording the previous channel information DC inside the memory115, the LED can be lit up in a short time without the need for receiving and sending to and from a broadcast station for a channel scan again.

FIG. 7is a flowchart describing an operation of the case of again lighting up an LED of a channel selection button when an LED of the mobile telephone has been turned off shown inFIG. 1.

First and second methods for again lighting up an LED at the time of lights-out will be described.

The first method is a flow of performing a channel scan manually and a method for again acquiring channel information based on a reception state of broadcast waves from a broadcast station as shown in, for example,FIG. 3.

The second method is a method for reading out channel information DC already recorded in the memory115by depressing the lighting button RB without performing a channel scan, and lighting up the light emitting part (LED)112based on this channel information DC as shown in, for example,FIG. 7.

Only a difference from the operation shown inFIG. 3will be described.

Specifically, when the control part116determines that a channel scan is not performed manually in step ST1, that is, a scan button SB of the key operation part111is not operated, it determines whether or not the lighting button RB is operated (ST6).

When it is determined that the lighting button RB is operated in the determination of step ST6, the flowchart proceeds to processing of step ST4and channel information DC already recorded in the memory115is read out and the light emitting part (LED)112is lit up based on this channel information DC.

On the other hand, when it is determined that the lighting button RB is not operated in the determination of step ST6, the series of processing is ended.

For example, as an actual operation method, the processing in response to an operation of the lighting button RB as shown in the second method is preferable from the standpoint of operability.

Also, the configuration may be such that the lighting button RB is not disposed separately.

For example, the control part116may light up the light emitting part (LED)112based on the channel information DC using any of the button operations of the key operation part111as a trigger.

A change procedure of a channel of the case of this configuration will be described.

When any of the channel selection buttons B among the key operation part111is operated (first time), the LEDs112are lit up, and when any of the lit channel selection buttons B among the LEDs is operated (second time), the channel is decided to a channel corresponding to this channel selection button B (two-stage operation).

Also, the channel selection buttons B are further effective in prioritizing a change in a channel and using the other key operation parts for the purpose of LED lighting. That is, it is similar to “*”, “0”, “#” buttons as well as numeric keys.

FIG. 8is a diagram describing one specific example of an operation at the time of receiving digital broadcast waves shown inFIG. 1.

For example, the control part116according to the present embodiment lights up channel selection buttons B at the time of starting to receive digital broadcast waves.

Specifically, the control part116records a channel at the time of the previous end in the memory115.

At the time of activating a digital broadcast receiving function, based on information indicating a channel at the time of the previous end recorded in the memory115, the control part116makes the tuner part101receive broadcast waves of this channel and makes the display part106display an image in response to contents data included in the broadcast waves.

Also, at the same time, the control part116lights up a viewable channel and blinks a displayed channel in a manner similar to the above based on channel information DC recorded in the memory115.

Thus, even when a user performs another operation (for example), during viewing, a broadcast of the previous channel can be viewed without performing troublesome operation by again activating the digital broadcast receiving function.

Also, a receivable channel selection button B is lit up based on channel information DC recorded in the memory115, so that notification of a receivable channel can be provided without performing a scan again.

As described above, the mobile telephone100according to the present embodiment is provided with the tuner part101for receiving broadcast waves of a channel specified, the key operation part111including plural channel selection buttons B corresponding to channels, and the control part116for performing control so as to be able to visually distinguish a channel selection button B corresponding to a channel capable of being received by the tuner part101from the other channel selection buttons B among the plural channel selection buttons B, so that notification of a receivable channel can be provided surely.

Also, the light emitting part (LED)112disposed in correspondence with a channel selection button B is disposed, and the control part116makes the light emitting part (LED)112light up and illuminates a channel selection button B corresponding to a channel capable of being received by the tuner part101, so that a user can be notified of a receivable channel more surely.

Also, the control part116performs control so as to be able to visually distinguish a channel selection button B corresponding to a channel displayed on the display part106from the other channel selection buttons B, among the plural channel selection buttons B corresponding to channels capable of being received by the tuner part101.

Control is performed distinguishably by, for example, blinking and lighting, or blue and red, so that a user can surely be notified of a channel displayed on the display part106.

That is, notification of a channel selection button B of a receivable channel is provided by light emission or illumination, so that it is easy for a user to select a channel.

Also, notification of a receivable channel is provided by light emission or illumination of the key operation part111without displaying an image about the receivable channel on the display part106, so that processing of the display of the display part106can be reduced.

Also, the control part116makes the light emitting part (LED)112corresponding to a channel emit light at light emission intensity corresponding to a reception state of broadcast waves of each of the channels by the tuner part101or causes light emission by color that correspond to a reception state, and thereby notification reflecting the reception state can be provided.

For example, while checking light emission or illumination of a channel selection button B, a user can search an environment (a place, a position or a direction of a terminal) with a good reception state.

Also, a user can find channels with a good reception state and can intentionally select the channel with a good reception state.

FIG. 9is a diagram describing an operation at the time of movement of a mobile telephone according to a second embodiment of the invention.

Next, an operation at the time of movement which is a feature of a digital broadcast receiving apparatus for mobile unit, particularly, a channel scan will be described with reference toFIG. 9.

A problem does not arise particularly in the case of moving within the same reception area, but the following description assumes moving to change a reception area while a digital broadcast is viewed by a mobile telephone as shown in, for example,FIG. 9.

The mobile telephone moves from a reception area AR1001A of a broadcast station1001A to a reception area AR1001B of another broadcast station1001B as shown in, for example,FIG. 9. Therefore, digital broadcast waves sent from the broadcast station1001A that are received in the reception area AR1001A can no longer be received.

A mobile telephone100aaccording to the present embodiment has an area detection part for determining a broadcast station of an information sending source. When this area detection part detects a change in a broadcast station, a channel scan is executed automatically.

Description will be made below with reference to the drawings.

FIG. 10is a functional block diagram of the mobile telephone according to the second embodiment of the invention.

The mobile telephone100aaccording to the present embodiment has a tuner part101, a demodulation part102, a demultiplexing part103, an image processing part104, a data processing part105, a display part106, a sound processing part107, a voice receiving part108, a voice transmitting part109, a communication part110, a key operation part111, a light emitting part112, a light emission adjusting part113, a channel scan part114, a memory115, a control part116and an area detection part117as shown in, for example,FIG. 10.

A difference between the mobile telephone100aand the mobile telephone100according to the first embodiment is that the area detection part117is additionally provided.

Only the difference from the first embodiment will be described. The same numerals are attached to the other components and their descriptions are omitted.

The area detection part117detects a change in a reception area and outputs a signal indicating a detection result to the control part116.

Specifically, the area detection part117determines a reception area based on, for example, receiving area information or receiving intensity, etc., of broadcast waves sent from a broadcast station of an information sending source.

When the area detection part117detects a change in this reception area, for example, a change in the broadcast station, the control part116makes the channel scan part114perform a channel scan and makes the light emitting part (LED)112of a channel selection button B corresponding to a channel capable of being received by the tuner part101light up.

Or, the control part116acquires channel information and makes the light emitting part112corresponding to a channel selection button B of a receivable channel light up.

Also, the control part116makes the display part106perform display of a channel capable of being received by the tuner part101and information about a broadcast station of the channel being associated with each other, when a channel scan is executed.

Specifically, the control part116makes the display part106display a list TP of television stations and channels assigned to broadcast stations of a moving destination.

In the present embodiment, the list TP is displayed after an automatic channel scan, and this is because a television station offering a program as well as a channel number may want to be checked in a new place.

Of course, a reception state of each channel can also be displayed in this list TP as information.

Also, the control part116may display a program of, for example, the smallest number in the viewable channels, on the display part106in a manner similar to the first embodiment.

Further, in order to take advantage of movement as a portable terminal, the control part116may always control light emission color or light emission intensity of the light emitting part (LED)112in response to a reception state while updating a reception state by the tuner part101.

Thus, notification of a receivable channel can always be provided.

FIG. 11is a flowchart describing an operation at the time of movement of the mobile telephone shown inFIG. 10.

An operation of the case where the mobile telephone moves at the time of, for example, television viewing will be described with a focus on an operation of the control part116with reference toFIG. 11.

In step ST201, the control part116determines whether or not the area detection part117detects a change in a reception area.

When it is determined that the reception area is not changed, the control part116performs normal processing.

On the other hand, when the area detection part117detects the change in the receiving area in step ST201, the channel scan part114is made to execute a channel scan automatically (ST202) and channel information DC is generated based on receiving intensity of broadcast waves from a broadcast station within the reception area (ST203).

In step ST204, the control part116records the channel information DC in the memory115.

In step ST205, the control part116performs control so as to visually distinguish, by making the light emitting parts (LEDs)112disposed in correspondence with plural channel selection buttons B corresponding to viewable (receivable) channels light up and suppressing light emissions of the light emitting parts112disposed in correspondence with the other channel selection buttons B among the plural channel selection buttons B, based on the channel information DC indicating a result of the channel scan.

In step ST206, the control part116makes the display part106display the channel list TP described above based on the scan result.

Since the other actions are similar to those of the first embodiment, the description is omitted.

As described above, in the present embodiment, the area detection part117for detecting a change in a reception area (area) is provided and the control part116makes the light emitting part (LED)112corresponding to a channel selection button B of a channel capable of being received by the tuner part101light up when the area detection part117detects the change in the reception area, so that notification of a receivable channel can be provided surely even when moving from a reception area of a broadcast station to a reception area of another broadcast station.

Also, the control part116makes the light emitting part (LED)112light up and makes the display part106perform display (for example, the list TP) in which a channel capable of being received by the tuner part101is associated with a broadcast station of the channel when the channel scan part114executes a channel scan for detecting the channel capable of being received by the tuner part101, so that notification of information in which a receivable channel is associated with a broadcast station can be provided at the time of movement.

Also, for example, even in the area visited for the first time, information about receivable channels of television broadcasting or radio broadcasting can be obtained and a desired view program can be viewed.

That is, even when a reception area changes during movement, an operation and channel selection for continuous viewing are easy.

Also, by performing a channel scan automatically when a reception area changes and video is not temporarily displayable, a user can find, for example, a cause for the received picture not being displayed.

In addition, the invention is not limited to the present embodiments and preferred modifications can be made arbitrarily.

For example, a configuration of the mobile telephone100described above is not limited to the configuration described above.

Also, the program (PRG) may be downloaded through a communication network.

Also, the control part may be implemented by a circuit of hardware having the functions according to the invention.

INDUSTRIAL APPLICABILITY

In a digital broadcast receiving apparatus of the invention described in (1) to (7), a user can be notified of a receivable channel surely, so that industrial applicability is extremely wide as a digital broadcast receiving apparatus mounted in a mobile unit of a mobile telephone, a PDA, a car navigation apparatus, etc.

In addition, the invention is not limited to the embodiments described above.