# Patent

## Title
Broadcasting receiving apparatus and broadcasting receiving method

## Abstract

Disclosed a digital-broadcasting receiving apparatus including: a scramble judgment member, a decode judgment member, a first registration member to register the sub-channel as a viewable channel when the decode judgment member judges that the broadcast data can be decoded, a second registration member to register the sub-channel as a viewable channel when the scramble judgment member judges that the broadcast data is not scrambled, a judgment member, a channel registration control member to register the sub-channel by the first registration member when the judgment member judges that the scramble judgment does not accord with the decode judgment in all kinds of the scramble judgment data, and refers to one of a plural kinds of scramble judgment data and registers the sub-channel by the second registration member when it judged that the scramble judgment obtained by referring to the one scramble judgment data accords with the decode judgment.

## Background
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a digital-broadcasting receiving apparatus and a digital-broadcasting receiving method.
2. Description of Related Art
A digital-broadcasting wave includes a broadcast data of a physical channel assigned to each frequency band area, and the broadcast data of each physical channel includes a broadcast data of plural sub-channels. In order to allow the broadcast data of the physical channel assigned to the limited frequency band area to include the broadcast data of plural sub-channels, a video data, an audio data, etc., which are included in the broadcast data of the physical channel are coded and multiplexed by the MPEG2 (Moving Picture Experts Group Phase2)-TS (Transport Stream) system. Therefore, in order to view the broadcast data of each sub-channel, in the digital broadcasting receiving apparatus which receives a digital-broadcasting airwave, it is necessary to recognize and register individually beforehand the sub-channel included in the digital-broadcasting wave. Then, the technique to scan and register the broadcast data of the sub-channel included in the digital-broadcasting wave has been developed (e.g. JP2002-320152A).
The sub-channel includes a free sub-channel and a pay sub-channel. A video data, a audio data, etc. of the pay sub-channel are usually coded (hereinafter referred to as “scrambled”) so that only the person who paid a charge can view it (e.g. JP2000-032414A). In some cases, the non-scrambled broadcast data of the sub-channel and the scrambled broadcast data of the sub-channel are mixed in the broadcast data of the physical channel. In this case, when all the broadcast data of the sub-channels included in the digital-broadcasting wave are scanned and registered, non-scrambled sub-channels which are not viewable are also registered.
For example, by referring to a tsc (transport scrambling control) bit in a header region of the broadcast data of the sub-channel, it is judged whether the broadcast data of the sub-channels is scrambled or not.
However, actually, because the tsc bit does not often reflect whether the broadcast data is scrambled or not, there is the case that it cannot be exactly judged whether it is scrambled or not by referring the tsc bit.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a digital broadcasting apparatus and a digital broadcasting method in which the sub-channel is examined whether it is scrambled more exactly and is registered.
In order to accomplish the above object, in accordance with a first aspect of the invention, a digital-broadcasting receiving apparatus comprising: a scanning member to scan a broadcast data of a sub-channel included in a broadcast data of a physical channel which is transmitted by a digital-broadcasting wave; a scramble judgment member to judge whether the broadcast data is scrambled or not by referring individually to a plural kinds of scramble judgment data, which are included in the broadcast data of the sub-channel scanned by the scanning member, and are data for judging whether the broadcast data is scrambled or not; a decode judgment member to judge whether the broadcast data is scrambled or not by judging whether the broadcast data can be decoded or not; a first registration member to register the sub-channel as a viewable channel when the decode judgment member judges that the broadcast data can be decoded; a second registration member to register the sub-channel as a viewable channel when the scramble judgment member judges that the broadcast data is not scrambled; a judgment member to judge whether the judgment obtained by the scramble judgment member referring to one of the plural kinds of scramble judgment data accords with the judgment obtained by the decode judgment member; and a channel registration control member to allow the first registration member to register the sub-channel when the judgment member judges that the judgment obtained by the scramble judgment member does not accord with the judgment obtained by the decode judgment member in all kinds of the scramble judgment data, and to allow the second registration member to register the sub-channel with referring to one of the plural kinds of scramble judgment data when the judgment member judges that the judgment obtained by the scramble judgment member referring to the one scramble judgment data accords with the judgment obtained by the decode judgment member.
As above, the digital-broadcasting receiving apparatus comprising: a scramble judgment member to judge whether the broadcast data is scrambled or not by referring individually to plural kinds of scramble judgment data, which is included in the broadcast data of the sub-channel, for judging whether the broadcast data is scrambled or not, a decode judgment member to judge whether the broadcast data is scrambled or not by judging whether the broadcast data can be decoded or not, a first registration member to register the sub-channel as a viewable channel when the decode judgment member judges that the broadcast data can be decoded, a second registration member to register the sub-channel as a viewable channel when the scramble judgment member judges that the broadcast data is not scrambled, a judgment member to judge whether the judgment obtained by the scramble judgment member referring one of the plural kinds of scramble judgment data accords with the judgment obtained by the decode judgment member. Further, the channel registration control member registers the sub-channel by the first registration member when the judgment member judges the judgment obtained by the scramble judgment member does not accord with the judgment obtained by the decode judgment member in all kinds of the scramble judgment data, and refers to one of the plural kinds of scramble judgment data and registers the sub-channel by the second registration member when the judgment member judges the judgment obtained by the scramble judgment member referring to the above scramble judgment data accords with the judgment obtained by the decode judgment member. The CPU 7 refers to the plural kinds of scramble judgment data and searches the scramble judgment data which exactly reflect whether the broadcast data was scrambled so as to judges, based on the scramble judgment data, whether the broadcast data was scrambled more exactly. The CPU 7 judges more exactly whether the broadcast data was scrambled by judging whether it can be decoded when the CPU 7 cannot judge whether the broadcast data was scrambled by referring the plural kinds of scramble judgment data. As a result, it becomes possible to register the sub-channel as well as to confirm more exactly whether it is scrambled or not.
Preferably, the scramble judgment data is one of a transport scrambling control bit in a header region of the video data of the sub-channel, a descriptor tag in the program map table and a packetized elementary stream scrambling control in the video/audio of the sub-channel.
According to the above, not to mention the effect that is similar to the above, in particular, the scramble judgment data is one of the transport scrambling control bit in a header region of the video data of the sub-channel, the descriptor tag in the PMT (Program Map Table) and the PES (Packetized Elementary Stream) scrambling control in the video/audio of the sub-channel, so that one of three scramble judgment data which exactly reflects whether the broadcast data is scrambled or not is selected. As a result, it is possible to judge whether the broadcast data coded with the MPEG2-TS method is scrambled or not.
In accordance with a second aspect of the invention, a digital-broadcasting receiving method for the digital-broadcasting receiving apparatus as claimed in claim 2, comprising the steps of: a scanning step to scan the broadcast data of the sub-channel included in the broadcast data of the physical channel; a scramble judging step to judge whether the broadcast data is scrambled or not by referring individually to a plural kinds of scramble judgment data which is included in the broadcast data of the sub-channel scanned by the scanning member; a decode judging step to judge whether the broadcast data of the sub-channel is scrambled or not by judging whether the broadcast data can be decoded or not; a judging step to judge whether a judgment obtained in the scramble judging step accords with a judgment obtained in the decode judging step; and a channel registration controlling step to allow the first registration member to register the sub-channel when it is judged in the judging step that the judgment obtained in the scramble judging step does not accord with the judgment obtained in the decode judging step in all kinds of the scramble judgment data, and to allow the second registration member to register the sub-channel with referring to one of the plural kinds of scramble judgment data when it is judged in the judging step that the judgment obtained by referring to the one scramble judgment data in the scramble judging step accords with the judgment obtained in the decode judging step.
As above, in the scramble judging step, the scramble judgment member judges whether the broadcast data is scrambled or not by referring individually to plural kinds of scramble judgment data which is included in the broadcast data of the sub-channel, in the decode judging step, the decode judgment member judges whether the broadcast data is scrambled or not by judging whether the broadcast data can be decoded or not, in the judging step, the judgment member judges whether the judgment obtained in the scramble judging step accords with the judgment obtained in the decode judging step, in the channel registration controlling step, the channel registration control member registers the sub-channel by the first registration member when it is judged in the judging step that the judgment obtained in the scramble judging step does not accord with the judgment obtained in the decode judging step in all kinds of the scramble judgment data, and referring to one of the plural kinds of scramble judgment data and registering the channel by the second registration member when it is judged in the judging step that the judgment obtained by referring to the above scramble judgment data in the scramble judging step accords with the judgment obtained in the decode judging step. The CPU 7 refers to the plural kinds of scramble judgment data and searches the scramble judgment data which exactly reflect whether the broadcast data was scrambled so as to judges, based on the scramble judgment data, whether the broadcast data was scrambled more exactly. The CPU 7 judges more exactly whether the broadcast data was scrambled by judging whether it can be decoded when the CPU 7 cannot judge whether the broadcast data was scrambled by referring the plural kinds of scramble judgment data. As a result, it becomes possible to register the sub-channel as well as to confirm more exactly whether it is scrambled or not.
Preferably, the scramble judging step, the decode judging step, the judging step and the channel registration controlling step are executed for each physical channel.
According to the above, not to mention the effect that is similar to the above, in particular, since the scramble judgment step, the decoding judgment step, the judgment step and the channel registration control step are executed for every physical channel, it is possible to deal with the situation where whether the predetermined data reflects the scrambling differs with respect to the physical channels. Thus, it is possible to register the channel more effectively while confirming whether it is scrambled or not.



BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the appended drawings which given by way of illustration only, and thus are not intended as a definition of the limits of the present invention, and wherein:
FIG. 1 is a block diagram showing main constitution of the digital broadcasting receiving apparatus of the invention;
FIG. 2 is a block diagram explaining the relation between a control section and the other sections of the invention;
FIG. 3 is a flow chart explaining operation of the digital broadcasting receiving apparatus of the invention;
FIG. 4 is a flow chart explaining operation of the digital broadcasting receiving apparatus of the invention; and
FIG. 5 is a flow chart explaining operation of the digital broadcasting receiving apparatus of the invention.



DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the best mode for carrying out the digital broadcasting receiving apparatus and a digital-broadcasting receiving method of the present invention will be described in detail with reference to the drawings.
First, a composition of a digital-broadcasting receiving apparatus 100 of the invention is explained. The digital-broadcasting receiving apparatus 100 of this invention comprises, as shown in FIG. 1, an antenna 1, a tuner section 2, a separation section 3, a decoder 4, a control section 5, an input section 6, and the like.
The digital-broadcasting receiving apparatus 100 is connected with a display 200 and a sound output apparatus 300.
The antenna 1 is a parabolic antenna, a UHF antenna, etc., receives a digital airwave and outputs a RF (Radio Frequency) signal to a broadcast wave memory or the tuner section 2. A connecting cable (not shown) etc. may be provided instead of the antenna 1 in the case of receiving the digital airwave through a CATV line. A broadcast data of a physical channel contained in the digital airwave is multiplexed by, for example, the MPEG2-TS method.
The tuner section 2 comprises, for example, a mixer (not shown), a tuning circuit (not shown), a reverse interleave circuit (not shown), an error correction circuit (not shown), a demodulation circuit (not shown), etc. In the tuner section 2, the mixer, the tuning circuit, etc. generates the IF (Intermediate Frequency) signal of the physical channel desired by a user from the RF signal inputted from the antenna 1. In the tuner section 2, the reverse interleave circuit, the error correction circuit, the demodulation circuit, etc. give error correction processing, recovery processing, etc. to the generated IF signal, so that the IF signal is converted into a TS (Transport Stream) signal as broadcast data. The TS signal generated by the tuner section 2 is outputted to the separation section 3.
The tuner section 2 is controlled by a CPU 7 executing the scanning program 9C described below, searches entire band of the RF signal inputted from the antenna 1, so as to search a physical channel with an airwave.
The separation section 3 is connected with, for example, the tuner section 2, the decoder 4, etc., divides the TS signal inputted from the tuner section 2 into a video data, a audio data and PSI/SI (Program Specific Information/Service Information), and outputs them to the decoder 4.
The decoder 4 decodes the video data and the audio data inputted from the separation section 3, and outputs them to the display 200 and the sound output apparatus 300.
The control section 5 comprises, as shown in FIG. 2, the CPU (Central Processing Unit) 7, a RAM (Random Access Memory) 8, a memory section 9, etc., is connected with the tuner section 2, the separation section 3, the decoder 4, the input section 6, etc., and controls each section of the digital-broadcasting receiving apparatus 100.
The CPU 7 controls the digital-broadcasting receiving apparatus 100 integrally by retrieving a processing program etc. stored in the memory section 9, developing it to the RAM 8, and executing it.
The RAM 8 develops the processing program etc. executed by the CPU 7 to a program storage region in the RAM 8, and stores an input data and a processing result produced in executing the above-mentioned processing program to a data storage region.
The memory section 9 comprises, for example, a recording medium (not shown) to which a program or a data are stored previously, and the recording medium comprises a semiconductor memory, etc. The memory section 9 stores various data for the CPU 7 to control the digital-broadcasting receiving apparatus 100 integrally, various processing programs, a data processed by executing these programs, etc. Specifically, the memory section 9 stores, for example as shown in FIG. 2, a channel data 9A, a search program 9B, a scanning program 9C, a scramble judgment program 9D, a decode judgment program 9E, a detailed registration program 9F, a simple registration program 9G, a judgment program 9H, a registration control program 9I, a normal broadcast program 9J, etc.
The channel data 9A stores, for example, a sub-channel which is not scrambled, as a viewable channel.
The search program 9B, for example, is a program for the CPU 7 to control the tuner section 2 to search entire band of the RF signal inputted from the antenna 1, to convert the RF signal into the IF signal of the physical channel, to convert the IF signal into the TS signal of a predetermined physical channel.
The scanning program 9C, for example, is a program for the CPU 7 to scan a broadcast data of a sub-channel included in the TS signal generated by the tuner section 2. The CPU 7 is the member to scan by executing the scanning program 9C.
The scramble judgment program 9D, for example, is a program for the CPU 7 to refer individually to plural kinds of scramble judgment data, which is included in the broadcast data of the scanned sub-channel, for judging whether the broadcast data is scrambled or not, and to judge whether the broadcast data is scrambled or not. The scramble judgment data is, for example, one of the transport scrambling control bit in a header region of the video data included in the broadcast data of the sub-channel, the descriptor tag in the PMT (Program Map Table) and the PES (Packetized Elementary Stream) scrambling control included in the video data or the audio data. The CPU 7 functions as the scramble judgment member by executing the scramble judgment program 9D.
Specifically, the CPU 7 refers to a tsc bit which is the 2-bit field according to section 2.4.3.3 of ISO/IEC 13818-1 “Semantic definition of fields in Transport Stream packet layer” so as to judge that the broadcast data is scrambled when the values of the tsc bit is “01”, “10”, or “11”, and to judge that the broadcast data is not scrambled when the value of the tsc bit is “00”.
When there is a descriptor according to the syntax of section 2.6.1 of ISO/IEC 13818-1 “Semantic definition of fields in program and program element descriptors” in the PMT according to the syntax of section 2.4.4.9 of ISO/IEC 13818-1 “Semantic definition of fields in Transport Stream program map section” and a the descriptor tag which is a value within the syntax is “0x09”, i.e., a value showing CA (Conditional Access) descriptor, the CPU 7 judges that the broadcast data is scrambled and when the descriptor tag is not “0x09”, CPU 7 judges that the broadcast data is not scrambled.
The CPU 7 refers to the PES scrambling control which is the 2-bit field according to section 2.4.3.7 of ISO/IEC 13818-1 “Semantic definition of fields in PES packet” so as to judge that the broadcast data is scrambled when the value of the PES scrambling control is “01”, “10” or “11”, and to judge that the broadcast data is not scrambled when the value of the PES scrambling control is “00”.
The decode judgment program 9E, for example, is a program for the CPU 7 to control the decoder 4 and let it decode the broadcast data of the scanned sub-channel, and to judge whether the broadcast data is scrambled or not by judging whether it can be decoded or not. The CPU 7 functions as a decode judgment member to judge whether the broadcast data can be decoded or not when the decode judgment program 9E is executed.
The detailed registration program 9F, for example, is a program for the CPU 7 to store the sub-channel at the channel data 9A as a viewable channel when the CPU 7 executes the decode judgment program 9E and judges that the broadcast data can be decoded. The CPU 7 functions as a first registration member when the detailed registration program 9F is executed.
The simple registration program 9G, for example, is a program for the CPU 7 to store the sub-channel at the channel data 9A as a viewable channel when it executes the scramble judgment program 9D and judges that the broadcast data is not scrambled. The CPU 7 functions as a second registration member when the simple registration program 9G is executed.
The judgment program 9H is, for example, a program for the CPU 7 to judge whether the judgment on one of the plural kinds of scramble judgment data obtained by executing the scramble judgment program 9D accords with the judgment obtained by executing the decode judgment program 9E. The CPU 7 functions as a judgment member when the judgment program 9H is executed.
The registration control program 9I, for example, is a program for the CPU 7 to register the sub-channel by executing the detailed registration program 9F when the CPU 7 executes the judgment program 9H and judges that the judgment obtained by executing the scramble judgment program 9D does not accord with the judgment obtained by executing the decode judgment program 9E in all kinds of the scramble judgment data (a detailed mode), and to register the sub-channel with referring to the following one scramble judgment data and executing the simple registration program 9G when the CPU 7 judges that the judgment on one of the plural kinds of scramble judgment data obtained by executing the scramble judgment program 9D accords with the judgment obtained by executing the decode judgment program 9E (a simple mode). The CPU 7 functions as a channel registration control member to execute this registration control program 9I and controls the registration.
The normal broadcast program 9J, for example, is a program for the CPU 7 to control the tuner section 2 to generate the IF signal of the physical channel desired by a user from the RF signal inputted from the antenna 1 and convert the IF signal into the TS signal; to control the separation section 3 to divide the TS signal inputted from the tuner section 2 into the video data, the audio data and the PSI/SI (Program Specific Information/Service Information); and to control the decoder 4 to decode the video data and the audio data inputted from the separation section 3 so as to generate a video signal and a sound signal and output the video signal and the sound signal to the display 200 and the sound output apparatus 300 respectively.
The input section 6 comprises a key etc. to input an input signal of various operations into the digital-broadcasting receiving apparatus 100, and when a user operates the input section 6, an input signal of the various operations is inputted into the digital-broadcasting receiving apparatus 100.
Next, a channel registration operation of the digital-broadcasting receiving apparatus 100 of the present invention which has the above-mentioned composition is explained, referring to flow charts shown in FIGS. 3-5.
First, a user operates the input section 6 to input a channel registration operation signal. The CPU 7 initializes the number of physical channels (the number of physical channels=0) which has been searched by the CPU 7 and stored at the RAM 8 (Step S1).
Subsequently, the CPU 7 adds “1” to the number of physical channels (Step S2).
Next, the CPU 7 controls the tuner section 2 by executing the search program 9B, so as to search entire band of the RF signal inputted from the antenna 1, and let it detect the RF signal of the physical channel with a broadcast signal (Step S3).
In Step S3, when the tuner section 2 does not detected the RF signal of the physical channel with the broadcast signal (Step S3; No),the channel registration operation advances to Step S30 (Step S4).
In Step S3, when the tuner section 2 detects the RF signal of the physical channel with the broadcast signal (Step S3; Yes), the CPU 7 controls the tuner section 2 based on the search program 9B, to detect the number of sub-channels contained in the physical channels detected in Step S3 (Step S5).
Subsequently, the CPU 7 initializes the number of sub-channels (the number of sub-channels=1) which is registered by the CPU 7 and stored at the RAM 8 (Step S6).
Next, the CPU 7, based on the search program 9B, converts the RF signal into the IF signal, converts the IF signal into the TS signal, scans the broadcast data of the sub-channel contained in the TS signal by executing the scanning program 9C (scanning step). The CPU 7 executes the scramble judgment program 9D so that the CPU 7 refers to the tsc bit and judges whether the broadcast data is scrambled or not (Step S7: scramble judgment step).
Next, the CPU 7 executes the decode judgment program 9E and judges whether the broadcast data is scrambled or not by judging whether it can be decoded or not (Step S8: decoding judgment step).
Next, the CPU 7 executes the judgment program 9H and judges whether the judgment in Step S7 accords with the judgment in Step S8 (Step S9: judgment step).
In Step S9, when the CPU 7 judges that the judgment in Step S7 accords with the judgment in Step S8 (Step S9; Yes), the CPU 7 executes the registration control program 9I so as to determine the channel register mode as the simple mode and determines to execute the scramble processing judgment with referring to the tsc bit (Step S10: channel registration control step).
In Step S9, when the CPU 7 judges that the judgment in Step S7 does not accord with the judgment in Step S8 (Step S9; No), the CPU 7 executes the scramble judgment program 9D so that the CPU 7 refers to the descriptor tag and judges whether the broadcast data is scrambled or not by (StepS11: scramble judgment step).
Next, the CPU 7 executes the decode judgment program 9E and judges whether the broadcast data is scrambled or not by judging whether it can be decoded (Step12: decode judgment step).
Next, the CPU 7 executes the judgment program 9H and judges whether the judgment in Step S11 accords with the judgment in Step S12 (Step S13: judgment step).
In Step S13, when the CPU 7 judges that the judgment in Step S11 accords with the judgment in Step S12 (Step S13; Yes), the CPU 7 executes the registration control program 9I so as to determine the channel register mode as the simple mode and determines to execute the scramble processing judgment with referring to the descriptor tag (Step S14: channel registration control step).
In Step S13, when the CPU 7 judges that the judgment in Step S11 does not accord with the judgment in Step S12 (Step S13; No), the CPU 7 executes the scramble judgment program 9D so that the CPU 7 refers to the PES scrambling control and judges whether the broadcast data is scrambled or not (Step S15: scramble judgment step).
Next, the CPU 7 executes the decode judgment program 9E and judges whether the broadcast data is scrambled or not by judging whether the broadcast data can be decoded (Step S16: decode judgment step).
Next, the CPU 7 executes the judgment program 9H and judges whether the judgment in Step S15 accords with the judgment in Step S16 or not (Step S17: judgment step).
In Step S17, when the CPU 7 judges the judgment in Step S15 accords with the judgment in Step S16 (Step S17; Yes), the CPU 7 executes the registration control program 9I so as to determine the channel register mode as the simple mode and determines to execute the scramble processing judgment with referring to the PES scrambling control (Step S18: channel registration control step).
In Step S17, when the CPU 7 judges the judgment in Step S15 does not accord with the judgment in Step S16 (Step S17; No), the CPU 7 executes the registration control program 9I so as to determine the channel register mode as the detailed mode (Step S19: channel registration control step).
Next, the CPU 7 refers to one of the processing results produced in Step S8, Step S12 and Step S16 which are stored at the RAM 8, and judges whether the broadcast data of the sub-channel of “1” can be decoded or not (Step S20).
In Step S20, when the CPU 7 judges that the broadcast data of the sub-channel of “1” cannot be decoded (Step S20; No), the channel registration operation advances to Step S22.
In Step S20, when the CPU 7 judges that the broadcast data of the sub-channel of “1” can be decoded (Step S20; Yes), the CPU 7 stores the sub-channel as a viewable channel at the channel data 9A (Step S21).
Next, the CPU 7 adds “1” to the number of sub-channels (Step S22).
Next, the CPU 7 refers the processing result stored at the RAM 8 and judges whether the channel register mode is set as the detailed mode or not (Step S23).
In Step S23, when the CPU 7 judges that the channel register mode is set as the simple mode (Step S23; No), the CPU 7 executes the simple registration program 9G, refers one of the scramble judgment data according to the determination in Step S10, Step S14 and Step S18, and judges whether the broadcast data of the sub-channel included in the TS signal is scrambled or not (Step S24).
In Step S24, when the CPU 7 judges that the broadcast data is scrambled (Step S24; Yes), the channel registration operation advances to Step S28.
In Step S24, when the CPU 7 judges that the broadcast data is not scrambled (Step S24; No), the CPU 7, based on the execution of the simple registration program 9G, registers the sub-channel as a viewable channel by storing it at the channel data 9A (Step S25). Then the channel registration operation advances to Step S28.
On the other hand, in Step S23, when the CPU 7 judges that the channel register mode is set as the detailed mode (Step S23; Yes), the CPU 7 executes the detailed registration program 9F and executes the decode judgment program 9E so as to judge whether the broadcast data can be decoded or not (Step S26).
In Step S26, when the CPU 7 judges that the broadcast data cannot be decoded (Step S26; No), the channel registration operation advances to Step S28.
In Step S26, when the CPU 7 judges that the broadcast data can be decoded (Step S26; Yes), the CPU 7, based on the execution of the detailed registration program 9F, stores the sub-channel as a viewable channel at the channel data 9A.
Next, the CPU 7 refers to the processing results, etc. stored at the RAM 8 and judges whether the number of the registered sub-channels reaches the maximum number of the channels or not (Step S28).
In Step S28, when the CPU 7 judges that the registered number of the sub-channels does not reach the maximum number of the channels (Step S28; No), the channel registration operation goes back to Step S22.
In Step S28, when the CPU 7 judges that the registered number of the sub-channels reaches the maximum number of the channels (Step S28; Yes), the CPU 7 refers to the processing results, etc. stored at the RAM 8 and judges whether the number of the searched physical channels reaches the maximum number of the physical channels (Step S30).
In Step S30, when the CPU 7 judges that the number of the searched physical channels does not reach the maximum number of the physical channels (Step S30; No), the channel registration operation goes back to Step 2.
In Step S30, when the CPU 7 judges that the number of the searched physical channels reaches the maximum number of the physical channels (Step S30; Yes), the channel registration operation ends.
According to the above-described digital broadcasting receiving apparatus 100 and the digital-broadcasting receiving method of the present invention, the CPU 7 executes the registration control program 9I so that the CPU 7 registers the sub-channel with the detailed mode when the CPU 7 executes the judgment program 9H and judges that the judgment by executing the scramble judgment program 9D does not accord with the judgment by executing the decode judgment program 9E in all kinds of the scramble judgment data. Also, the CPU 7 registers the sub-channel with the simple mode when the CPU 7 executes the judgment program 9H and judges that the judgment obtained by executing the scramble judgment program 9D and by referring to one of the plural kinds of scramble judgment data accords with the judgment obtained by executing the decode judgment program 9E. The CPU 7 refers to the plural kinds of scramble judgment data and searches the scramble judgment data which exactly reflect scrambling of the broadcast data so as to judges, based on the scramble judgment data, whether the broadcast data was scrambled more exactly. The CPU 7 judges more exactly whether the broadcast data was scrambled by judging whether it can be decoded when the CPU 7 cannot judge whether the broadcast data was scrambled by referring the plural kinds of scramble judgment data. As a result, it becomes possible to register the sub-channel while whether it is scrambled or not is confirmed more exactly.
According to the digital broadcasting receiving apparatus of the present invention, since the scramble judgment step, the decoding judgment step, the judgment step and the channel registration control step are executed for every physical channel, it is possible to deal with the situation where whether the predetermined data reflects the scrambling differs with respect to the physical channels. Thus, it is possible to register the channel more effectively while confirming whether it is scrambled or not.
The order of referring the scramble data by executing the scramble judgment program 9D is not limited to the present embodiment. It may be any possible order. It may be previously set by a user or set in the digital broadcasting receiving apparatus 100.
The predetermined data to which the CPU 7 refers by executing the scramble judgment program 9D is not limited to the present embodiment, any data can be given as long as the data can be judged whether it is scrambled or not.
Multiplexing of the broadcast data of the physical channel may be methods other than the MPEG2-TS method. When the broadcast data is multiplexed by methods other than the MPEG2-TS method, the predetermined data to which the CPU 7 refers by executing the scramble judgment program 9D may be any data as long as the data can be judged that it is scrambled or not.
The entire disclosure of Japanese Patent Application No. 2005-300267 filed on Oct. 14, 2005, including description, claims, drawings and summary are incorporated herein by reference in its entirety.

## Claims

1. A digital-broadcasting receiving apparatus comprising:
a scanning member to scan a broadcast data of a sub-channel included in a broadcast data of a physical channel which is transmitted by a digital-broadcasting wave;
a scramble judgment member to judge whether the broadcast data is scrambled or not by referring individually to one of a scramble judgment data, which is included in the broadcast data of the sub-channel scanned by the scanning member, of a transport scrambling control bit included in a header region of the video data of the sub-channel, a descriptor tag in the program map table and a packetized elementary stream scrambling control in the video/audio of the sub-channel;
a decode judgment member to judge whether the broadcast data of the sub-channel is scrambled or not by judging whether the broadcast data can be decoded or not;
a first registration member to register the sub-channel as a viewable channel when the decode judgment member judges that the broadcast data can be decoded;
a second registration member to register the sub-channel as a viewable channel when the scramble judgment member judges that the broadcast data is not scrambled;
a judgment member to judge whether the judgment obtained by the scramble judgment member referring to one of a plural kinds of scramble judgment data accords with the judgment obtained by the decode judgment member; and
a channel registration control member to allow the first registration member to register the sub-channel when the judgment member judges that the judgment obtained by the scramble judgment member does not accord with the judgment obtained by the decode judgment member in all kinds of the scramble judgment data, and to allow the second registration member to register the sub-channel with referring to the one of the plural kinds of scramble judgment data when the judgment member judges that the judgment obtained by the scramble judgment member referring to the one scramble judgment data accords with the judgment obtained by the decode judgment member.

2. A digital-broadcasting receiving apparatus comprising:
a scanning member to scan a broadcast data of a sub-channel included in a broadcast data of a physical channel which is transmitted by a digital-broadcasting wave;
a scramble judgment member to judge whether the broadcast data is scrambled or not by referring individually to a plural kinds of scramble judgment data, which are included in the broadcast data of the sub-channel scanned by the scanning member, and are data for judging whether the broadcast data is scrambled or not;
a decode judgment member to judge whether the broadcast data is scrambled or not by judging whether the broadcast data can be decoded or not;
a first registration member to register the sub-channel as a viewable channel when the decode judgment member judges that the broadcast data can be decoded;
a second registration member to register the sub-channel as a viewable channel when the scramble judgment member judges that the broadcast data is not scrambled;
a judgment member to judge whether the judgment obtained by the scramble judgment member referring to one of the plural kinds of scramble judgment data accords with the judgment obtained by the decode judgment member; and
a channel registration control member to allow the first registration member to register the sub-channel when the judgment member judges that the judgment obtained by the scramble judgment member does not accord with the judgment obtained by the decode judgment member in all kinds of the scramble judgment data, and to allow the second registration member to register the sub-channel with referring to one of the plural kinds of scramble judgment data when the judgment member judges that the judgment obtained by the scramble judgment member referring to the one scramble judgment data accords with the judgment obtained by the decode judgment member.

3. The digital-broadcasting receiving apparatus as claimed in claim 2,
wherein the scramble judgment data is one of a transport scrambling control bit in a header region of the video data of the sub-channel, a descriptor tag in the program map table and a packetized elementary stream scrambling control in the video/audio of the sub-channel.

4. A digital-broadcasting receiving method for the digital-broadcasting receiving apparatus as claimed in claim 2, comprising the steps of:
a scanning step to scan the broadcast data of the sub-channel included in the broadcast data of the physical channel;
a scramble judging step to judge whether the broadcast data is scrambled or not by referring individually to a plural kinds of scramble judgment data which is included in the broadcast data of the sub-channel scanned by the scanning member;
a decode judging step to judge whether the broadcast data of the sub-channel is scrambled or not by judging whether the broadcast data can be decoded or not;
a judging step to judge whether a judgment obtained in the scramble judging step accords with a judgment obtained in the decode judging step; and
a channel registration controlling step to allow the first registration member to register the sub-channel when it is judged in the judging step that the judgment obtained in the scramble judging step does not accord with the judgment obtained in the decode judging step in all kinds of the scramble judgment data, and to allow the second registration member to register the sub-channel with referring to one of the plural kinds of scramble judgment data when it is judged in the judging step that the judgment obtained by referring to the one scramble judgment data in the scramble judging step accords with the judgment obtained in the decode judging step.

5. The digital-broadcasting receiving method as claimed in claim 4,
wherein the scramble judging step, the decode judging step, the judging step and the channel registration controlling step are executed for each physical channel.