Audio equipment and method of displaying operation thereof

The present invention is concerned with an audio equipment capable of processing video signals and a method of displaying operation of the acoustic equipment. An input selector switch 1 is supplied with reproduced audio signals from devices connected to a tuner unit 2 and input terminals 3, and supplies a signal to a sound field processing DSP unit 4. A signal processed by the DSP unit 4 is applied through a muting switch 5 to an output terminal 6. An input selector switch 7 is supplied with reproduced video signals from devices connected to input terminals 8, and supplies a signal to a graphic controller (GDC) 9 which generates a video signal to display an image. One of a signal generated by the GDC 9 and an original video signal are selected by a switch 10, and applied to an output terminal 11. The GDC 9 also generates an image simulating a control panel. When a key switch 13 is operated, the display corresponding to the operated key in the simulating image is varied.

TECHNICAL FIELD 
The present invention relates to an audio equipment capable of processing 
video signals and a method of displaying operation of the acoustic 
equipment. 
BACKGROUND ART 
It has been practiced to supply audio signals reproduced from a VTR to an 
audio equipment to improve reproduced acoustic sounds. It is also 
customary to supply, simultaneously with the audio signals, video signals 
from the VTR to the audio equipment, from which the video signals are 
supplied to a video signal receiver or another VTR. When supplying video 
signals to another VTR for dubbing purpose or the like, the video signals 
may be amplified or otherwise processed in the audio equipment in a manner 
suitable for dubbing the video signals. 
Recent years have seen many various modes of signal processing in audio 
equipment. It is difficult to display necessary modes of signal processing 
sufficiently on a small-size display disposed on a control panel of audio 
equipment, for example. 
The present invention has been made in view of the above problems. 
DISCLOSURE OF THE INVENTION 
According to a first invention, there is provided an audio equipment for 
processing an audio signal and a video signal for a video signal receiver 
connected thereto, comprising means for detecting an operated state of a 
control panel, and means for producing a video signal to display an image 
simulating the control panel on the video signal receiver, the arrangement 
being such that when the control panel is operated, a video signal is 
produced in which the display at a position corresponding to a portion of 
the displayed image which is detected as being operated on the control 
panel is varied. 
According to a second invention, there is provided a method of displaying 
operation of an audio equipment, comprising the steps of detecting an 
operated state of a control panel of the audio equipment, and varying an 
image of an operated portion of an image simulating the control panel. 
According to a third invention, there is provided an audio equipment for 
processing an audio signal and a video signal for a video signal receiver 
connected thereto, comprising means for selecting and outputting signals 
from input terminals, and means for storing the names of devices connected 
to the input terminals and producing a video signal to display a list of 
the names of the devices, the arrangement being such that when one of the 
signals from the input terminals is selected, a video signal is produced 
in which the display at a position corresponding to the selected input 
terminal is varied on the displayed list. 
According to a fourth invention, there is provided a method of displaying 
operation of an audio equipment, comprising the steps of producing an 
image to display the names of devices connected to input terminals, 
detecting a selected one of the signals from the input terminals, and 
varying an image of a portion corresponding to the selected input terminal 
on the list. 
According to a fifth invention, there is provided a broadcast receiving 
apparatus for receiving broadcast signals and processing a video signal 
for a video signal receiver connected thereto, comprising means for 
storing the frequencies, set names, and sound field setting information of 
broadcast signals which are selectively receivable, and means for 
producing a video signal to display a list of the stored frequencies, set 
names, and sound field setting information on the video signal receiver, 
the arrangement being such that a video signal is produced in which the 
display at a position corresponding to a selected broadcast signal is 
varied on the displayed list. 
According to a sixth invention, there is provided a method of displaying 
operation of a broadcast receiving apparatus, comprising the steps of 
producing an image to display a list of the frequencies and/or set names 
and sound field setting information of broadcast signals which are 
selectively receivable, detecting a selected broadcast signal, and varying 
an image of a portion corresponding to the selected broadcast signal on 
the list. 
According to a seventh invention, there is provided an audio equipment for 
processing an audio signal and a video signal for a video signal receiver 
connected thereto, comprising means for processing an input signal into 
desired characteristics and outputting the processed input signal, means 
for storing a plurality of settings of processed characteristics, and 
means for producing a video signal to display a list of the plurality of 
settings on the video signal receiver, the arrangement being such that 
when one of the settings of processed characteristics is selected, a video 
signal is produced in which the display at a position of the setting of a 
selected one of the processed characteristics is varied on the list. 
According to an eighth first invention, there is provided a method of 
displaying operation of an audio equipment, comprising the steps of 
producing an image signal to display a list of a plurality of settings of 
processed characteristics, detecting the setting of a selected one of the 
processed characteristics, and varying an image of a portion corresponding 
the setting of the selected one of the processed characteristics on the 
list. 
According to a ninth invention, there is provided an audio equipment for 
processing an audio signal and a video signal for a video signal receiver 
connected thereto, comprising means for processing an input signal into 
desired sound field characteristics and outputting the processed input 
signal, means for setting a parameter of processing of the sound field 
characteristics, and means for producing a video signal to display the set 
parameter on the video signal receiver, the arrangement being such that 
when the parameter is set for the shape of a sound field, an image 
indicative of a standard shape of sound field is displayed on the video 
signal receiver, and a video signal is produced in which the image is 
enlarged or contracted as the parameter is varied. 
According to a tenth invention, there is provided a method of displaying 
operation of an audio equipment, comprising the steps of producing an 
image to display an image indicative of the shape of a standard sound 
field, detecting setting of a parameter of the shape of a sound field, and 
enlarging or contracting the image as the parameter is varied. 
According to an eleventh invention, there is provided an audio equipment 
for processing an audio signal and a video signal for a video signal 
receiver connected thereto, comprising means for processing an input 
signal into desired sound field characteristics and outputting the 
processed input signal, means for setting a parameter of processing of the 
sound field characteristics, and means for producing a video signal to 
display the set parameter on the video signal receiver, the arrangement 
being such that when the parameter is set for the material of a wall 
surface around a sound field, an image indicating the shape of the sound 
field is displayed on the video signal receiver, and a video signal is 
produced in which the color of a portion corresponding to the wall surface 
of the image is varied as the parameter is varied. 
According to a twelfth invention, there is provided a method of displaying 
operation of an audio equipment, comprising the steps of producing an 
image to display an image indicative of a sound field, detecting setting 
of a parameter of the material of a wall surface around the sound field, 
and varying the color of a portion corresponding to the wall surface of 
the image as the parameter is varied.

BEST MODE FOR CARRYING OUT THE INVENTION 
As shown in FIG. 1, an audio equipment according to the present invention 
has an audio signal input selector switch 1 that is supplied with a 
received AM/FM signal from a tuner unit 2, a reproduced signal from a CD 
player (not shown) connected to an input terminal 3, a reproduced signal 
from a DAT player (now shown) connected to an input terminal 3, audio 
signals from three video equipments VIDEO1, VIDEO2, VIDEO3 (not shown) 
connected to respective input terminals 3, and an audio signal monitored 
and reproduced from a recording equipment TAPE2 (not shown) connected to 
an input terminal 3 in a dubbing process, each of the signals being 
supplied in a stereophonic mode. One of the signals from the input 
selector switch 1 is supplied to a sound field processing DSP unit 4, 
which sends the processed signal through a muting switch 5 to an output 
terminal 6. 
The audio equipment also has a video signal input selector switch 7 that is 
supplied with video signals reproduced from the respective three video 
equipments VIDEO1, VIDEO2, VIDEO3. The video signal input selector switch 
7 supplies one of the video signals to a graphic controller (GDC) 9 which 
generates a video signal for a displayed image. One of the signal 
generated by the GDC 9 and the original signal is selected by a switch 10 
and supplied to an output terminal 11. 
The audio equipment further includes a system control microcomputer 12. The 
microcomputer 12 has a CPU 21, a ROM 22, and a RAM 23m, and effects 
control operation according to a program written in the ROM 22. Signals 
from key switches 13 of a control panel are supplied to the microcomputer 
12 to control the input selector switches 1, 7, the tuner unit 2, the DSP 
unit 4, the GDC 9, and the switches 5, 10. Statuses of the controlled 
components are displayed on a display unit 14 and an LED 15 on the control 
panel. 
The control panel of the audio equipment is arranged as shown in FIG. 2. In 
FIG. 2, the control panel has at least a power supply switch 51, an LED 52 
for indicating a display on a video signal receiver, a display unit 14, 
and a dial 53 for volume control. The control panel also has an operation 
key 31 corresponding to a key switch 13 for muting an audio signal, and an 
LED 15a for indicating an operation of the operation key 31. 
The control panel also includes a group of operation keys 32 corresponding 
to key switches 13 for controlling functions when the input selector 
switches 1, 7 are operated. The operation keys 32 include an operation key 
32b corresponding to a key switch 13 for selecting an audio signal that is 
monitored and reproduced from a recording equipment TAPE2 (not shown) 
through the input selector switch 1 during dubbing operation, and an LED 
15b for indicating an operation of the operation key 32b. 
The graphic controller (GDC) 9 generates video signals for displayed images 
as shown in FIGS. 3A and 3B. In FIG. 3A, an image which simulates the 
control panel is displayed on a left-hand side of the image displayed on 
the display unit 14. The simulating image includes images of the power 
supply switch 51, the display 14, the dial 53, etc. 
When one of the operation keys 31, 32 is operated, the display at the 
position of the operated key is altered as shown in FIG. 3B. In the 
example shown in FIG. 3, a bright display is produced in a position 
corresponding to the operation key 31 which mutes the audio signal, and a 
display in the shape of a bright frame is produced in a position 
corresponding to the operation key 32b which selects the audio signal 
monitored and reproduced from the recording equipment TAPE2 during dubbing 
operation. 
Displays similar to those in the displayed image and indicating the 
function of the operated key are produced at a lower right position in the 
displayed image. The name of the device which is selected by the input 
selector switches 1, 7 is displayed in a position corresponding to the 
image of the display unit 14 in the image simulating the control panel. 
Functions displayed in the display unit 14, for example, are displayed at 
enlarged scale in a upper right position in the displayed image. 
The audio equipment thus displays highly clearly data of the operated key 
in the image which simulates the control panel. 
FIG. 4 shows a flowchart of a key-in process for the above operation 
display process. When the key-in process is started, a step [1] determines 
whether the operation key 31 is operated or not, and then a step [2] 
determines whether the operation keys 32 are operated or not. If NO in the 
steps [1], [2], then control goes to a next process. If YES in the step 
[1], then the switch 5 is turned off in a step [3] and the LED 15 is 
energized in a step [4]. The switch 10 is shifted to the GDC 9 in a step 
[5], and display data are supplied to the GDC 9 in a step [6], after which 
control goes to the next process. 
The above displays are thus carried out in the manner described above. 
The control panel shown in FIG. 2 has a group of operation keys 33 
corresponding to key switches 13 for registering the names of input 
devices. The operation keys 33 include four upward, downward, leftward, 
and rightward operation keys 33a.about.33d, a start operation key 33e, and 
a memory operation key 33f, for example. 
The graphic controller (GDC) of the audio equipment generates video signals 
for displayed images as shown in FIGS. 5A and 5B. In FIG. 5A, the original 
names of the respective input terminals 3 are displayed in a left-hand 
side of the image, and the names of devices connected to the respective 
input terminals 3 are displayed in a central portion of the image. When 
one of the input devices is selected by the operation key 32, the display 
"DAT" is surrounded by a frame as shown, and the color of the displayed 
name of the device is altered. 
When the start operation key 33e is operated with the input device thus 
selected, an image for registering the name of the input device is 
displayed as shown in FIG. 3B. When the leftward and rightward operation 
keys 33a, 33b, for example, are operated, the position of characters for 
names to be registered is changed. The upward and downward operation keys 
33c, 33d can be operated in any desired position. When the upward and 
downward operation keys 33c, 33d are operated in a desired position, the 
character displayed in that position is changed. 
The available characters include alphabetical letters in upper and lower 
cases, numerals, simple symbols, etc., and can successively be displayed 
when the operation keys 33c, 33d are operated. The name of a desired 
device can be produced by operating the operation keys 33a-33d 
successively. When the name of a device is completed, the memory operation 
key 33f is operated to register the name of the device. 
If an editing process (EDIT) is carried out, then the name of the input 
device is displayed in a lower portion of the displayed image. The display 
is produced by copying the name which has been registered. If the audio 
equipment supplies the audio and video signals to another room (DRLC), 
then the name of the device which produces the signal that is supplied to 
the other room is displayed. This display is also produced by copying the 
name which has been registered. 
The audio equipment thus displays highly clearly a selected signal with a 
list of names of devices connected to the input terminals 3. 
FIG. 6 shows a flowchart of a key-in process for the above operation 
display process. When the key-in process is started, a step [1] determines 
whether the operation keys 32 are operated or not, and then a step [2] 
determines whether the operation keys 33 are operated or not. If NO in the 
steps [1], [2], then control goes to a next process. If YES in the step 
[1], then the switch 7 is shifted in a step [3], and then data is 
displayed on the display unit 14 in a step [4]. The switch 10 is shifted 
to the GDC 9 in a step [5], and display data is supplied to the GDC 9 in a 
step [6]. A display image of original names of the input terminals 3 is 
generated in a step [7], and a display image of names of devices connected 
to the input terminals 8 is generated in a step [8]. A step [9] then 
determines whether all names are displayed or not. If not displayed yet, 
then control returns to the step [7]. If all names are displayed, then the 
display of the name of the selected device is altered in a step [10], 
after which control goes to the next process. 
If YES in the step [2], then a step [12] determines whether data from the 
GDC 9 is displayed or not. If not displayed, then the steps [3].about.[9] 
are executed in a step [13]. If displayed, then the display of the name of 
the selected device is altered in a step [14]. A display image of the name 
of the device being inputted is generated in a step [15], which is 
followed by a step [16] that determines whether the display is flickering 
or not. If not flickering, then control proceeds to the next process. If 
flickering, then a display image in which the characters being inputted 
are turned off is generated in a step [17], from which control goes to the 
next process. 
The above displays are thus carried out in the manner described above. 
The control panel shown in FIG. 2 also has operation keys 34 corresponding 
to key switches 13 for selecting a broadcast signal (selective reception). 
The operation keys 34 include operation keys 34a.about.34j for selecting 
numerals ranging from 1 to 0, an operation key 34k for shifting letters A, 
B, C, an operation key 341 for directly setting a selected station, and 
operation keys 34m, 34n for automatically selecting a station or for 
selecting a station based on an index as described later on. 
The operation keys 33 on the control panel also correspond to key switches 
13 for registering desired set names of broadcast signals. The operation 
keys 33 include four upward, downward, leftward, and rightward operation 
keys 33a.about.33d, a start operation key 33e, and a memory operation key 
33f, for example. The control panel also includes an operation key 35 for 
setting sound fields as described later on. 
The operation keys 34a.about.34j, 34k are used to select broadcast signals 
in a total of 30 channels. When the numerical value of a frequency is 
inputted with the operation keys 34a.about.34j after the operation key 341 
has been operated, a broadcast signal of that frequency is directly 
selected. 
When the operation key 34m is operated, the frequencies are swept in a 
direction (+ or - determined by the operation key 34n) to automatically 
select a broadcast signal. With the broadcast signal directly or 
automatically selected, the operation keys 34a.about.34j, 34k, and the 
memory operation key 33f are operated to set the frequency of the selected 
broadcast signal to a selected channel. The set information is stored in 
the RAM 23. 
The graphic controller (GDC) 9 of the audio equipment generates video 
signals of display images as shown in FIGS. 7A and 7B. In FIG. 7A, the 
image is divided into left and right images, and the numbers of a total of 
30 channels composed of letters A, B, C and numerals 1.about.0 are 
displayed in left-hand sides of each of the left and right images. The 
bands FM/AM and the frequencies of broadcast signals that can selectively 
be received are displayed centrally in the left and right images, and 
information indicative of set sound fields is displayed in right-hand 
sides of each of the left and right images. When a channel is selected 
with the operation keys 34, the selected channel which is displayed is 
surrounded by a frame and its displayed color is altered as indicated at 
the channel A3. 
With the channel selected, when the operation key 35 for setting a sound 
field is operated, an image for setting a sound field is displayed as 
shown in FIG. 7B. A desired sound field is established when the operation 
keys 34a.about.34j, for example, are operated. There are available typical 
10 sound fields that have been preset in the DSP unit 4 and a maximum of 
10 sound fields that can be set by the user. When the memory operation key 
33f is operated, one of the available sound fields can be set in the 
selected channel. 
With the channel selected, when the start operation key 33e is operated, an 
image for registering a set name is displayed as shown in FIG. 8A. When 
the leftward and rightward operation keys 33a, 33b, for example, are 
operated, the position of characters for names to be registered is 
changed. When the upward and downward operation keys 33c, 33d are operated 
in any desired position, the character displayed in that position is 
changed. The available characters include alphabetical letters in upper 
and lower cases, numerals, simple symbols, etc., and can successively be 
displayed when the operation keys 33c, 33d are operated. A desired set 
name can be produced by operating the operation keys 33a.about.33d 
successively. When the set name is completed, the memory operation key 33f 
is operated to register the set name. 
The graphic controller (GDC) 9 switches between the above image and a 
display image shown in FIG. 8B. The image shown in FIG. 8B is divided into 
left and right images, and the numbers of a total of 30 channels composed 
of letters A, B, C and numerals 1.about.0 are displayed in left-hand sides 
of each of the left and right images. The bands FM/AM and the set names of 
broadcast signals that can selectively be received are displayed centrally 
in the left and right images, and information indicative of set sound 
fields is displayed in right-hand sides of each of the left and right 
images. When a channel is selected with the operation keys 34, the 
selected channel which is displayed is surrounded by a frame and its 
displayed color is altered as indicated at the channel A3. When broadcast 
signals are selected based on indexes, only those broadcast signals having 
the same set name are successively selected. 
The audio equipment thus clearly displays the states of selectively 
received broadcast signals on a list of the frequencies of broadcast 
signals, desired set names, and sound field setting information. 
FIG. 9 shows a flowchart of a key-in process for the above operation 
display process. When the key-in process is started, a step [1] determines 
whether the operation keys 34 are operated or not. If NO, then control 
proceeds to a next process. If YES, data stored in the RAM 23 is read in a 
step [2], and a frequency is set in the tuner unit 2 in a step [3]. A step 
[4] sets a sound field in the DSP unit 4, and a step [5] displays data on 
the display unit 14. 
A step [6] determines whether data has already been displayed or not. If 
YES, control goes to the next process. If NO, the switch 10 is shifted to 
the GDC 9 in a step [7], and then band display data is supplied to the GDC 
9 in a step [8]. A step [9] determines whether there is a setting name or 
not. If there is no setting name (NO), then display data for a frequency 
is supplied to the GDC 9 in a step [10]. If there is a setting name (YES), 
then display data for the setting name is supplied to the GDC 9 in a step 
[11]. 
Display data for setting a sound field is supplied to the GDC 9 in a step 
[12]. A step [13] then determines whether 30 stations have been displayed 
or not. If NO, then control returns to the step [8]. If YES, then a 
display image in which a channel being received is surrounded by a frame 
is generated. Thereafter, control goes to the next process. 
The above display can therefore be carried out in the manner described 
above. 
The control panel shown in FIG. 2 also has operation keys corresponding to 
key switches 13 for selecting settings for characteristic processing. The 
10 operation keys 34a.about.34j indicative of the numerals 1.about.0 
double as these operation keys. 
The operation keys 33 on the control panel also correspond to key switches 
13 for the user to provide a desired sound field. The operation keys 33 
include four upward, downward, leftward, and rightward operation keys 
33a.about.33d, a start operation key 33e, and a memory operation key 33f, 
for example. 
The control panel also includes operation keys 36 corresponding to key 
switches 13 for the user to set a desired equalizer curve. The operation 
keys 36 include an operation key 36a for turning on and off an equalizer, 
an operation key 36b for displaying an equalizer curve, an operation key 
36c for controlling an equalizer band, and an operation key 36d for 
controlling the level of the middle range of the equalizer curve. 
The control panel also includes an operation key 37 corresponding to a key 
switch 13 for the user to provide a desired dynamic range. The operation 
key 37 serves to turn on and off a dynamic range correcting mode, for 
example. 
The graphic controller (GDC) 9 of the audio equipment generates video 
signals of display images as shown in FIGS. 10A and 10B. In FIG. 10A, 
preset characteristics stored in the ROM 22 are displayed. The names of 
basic sound fields are displayed in a left-hand side of the image, and the 
on and off states of a sound field (surround) mode, an equalizer mode, and 
a dynamic range correcting mode are displayed in a right-hand side of the 
image. When the name of a desired sound field is selected with the 
operation keys 34a.about.34j, the displayed name is surrounded by a frame 
as indicated at HALL 1, for example. Audio signals can thus be processed 
in one of the 10 basic sound fields. 
If the user wishes to set desired characteristics, then the start operation 
key 33e is operated. When the start operation key 33e is operated, an 
image for setting characteristics is displayed as shown in FIG. 10B. When 
the operation keys 33a.about.33d are operated, the characteristics of a 
sound field (surround) are variously changed. 
To set a desired equalizer curve, the start operation key 33e is operated 
with the operation keys 36a on, and the display operation key 36b is 
operated. Now, an image for setting an equalizer is displayed as shown in 
FIG. 11A. When the operation key 36c for controlling the equalizer band is 
operated and the operation keys 33a.about.33d are operated, the level of 
each frequency is controlled. As the level of each frequency is 
controlled, the curve of the image is varied. When required, the level of 
the middle range of the equalizer curve is controlled with the operation 
key 36d. The above control processes are effected in each of the bands 
until the entire equalizer curve (characteristics) is established. 
To provide a desired dynamic range, the start operation key 33e is operated 
with the dynamic range correcting mode being on with the operation key 37. 
Now, an image for providing a dynamic range is displayed as shown in FIG. 
10B. When the operation keys 33a, 33b are operated, the characteristic 
curve of a dynamic range is controlled to change from a compressor curve 
into an expander curve. As the characteristic curve of a dynamic range is 
controlled, the curve in the image is varied. 
When the sound field (surround), the equalizer curve, and the dynamic range 
have achieved desired characteristics, the memory operation key 33f is 
operated, and the operation keys 34a.about.34j are operated to store the 
set characteristics in addresses in the RAM 23 that have been designated 
by the operation keys 34a.about.34j. 
The audio equipment can thus clearly display selected states of signals on 
a list of a plurality of settings. 
FIG. 12 shows a flowchart of a key-in process for the above operation 
display process. When the key-in process is started, a step [1] determines 
whether the operation keys 33 are operated or not and a step [2] 
determines whether the operation keys 34 are operated or not. If NO in the 
steps [1], [2], then control proceeds to a next process. If YES in the 
step [2], data stored in the RAM 23 is read in a step [3], and the read 
data is set in the DSP 4 in a step [4]. A step [5] displays the data on 
the display unit 14, and a step [6] shifts the switch 10 to the GDC 9. 
Thereafter, a step [7] supplies display data of basic sound fields to the 
GDC 9. A step [8] determines whether a sound field (surround) correcting 
mode is on or not. If on, then display data "ON" is supplied to the GDC 9. 
If off, then display data "OFF" is supplied to the GDC 9. Thereafter, a 
step [8] determines whether a sound field (surround) correcting mode is on 
or not. If on, then display data "ON" is supplied to the GDC 9 in a step 
[9]. If off, then display data "OFF" is supplied to the GDC 9 in a step 
[10]. A step [11] determines whether an equalizer mode is on or not. If 
on, then display data "ON" is supplied to the GDC 9 in a step [12]. If 
off, then display data "OFF" is supplied to the GDC 9 in a step [13]. 
Thereafter, a step [14] determines whether a dynamic range correcting is 
on or not. If on, then display data "ON" is supplied to the GDC 9 in a 
step [15]. If off, then display data "OFF" is supplied to the GDC 9 in a 
step [16]. 
A step [17] determines whether data of 10 sound field characteristics have 
been displayed or not. If NO, then control goes back to the step [7]. If 
YES, a step [18] generates a display image in which the display of a 
selected sound field is surrounded by a frame. Thereafter, control goes to 
the next process. 
If YES in the step [1], then a step [19] determines whether data from the 
GDC 9 is displayed or not. If not displayed, then the steps [3].about.[17] 
are executed in a step [20]. If displayed, the display of the selected 
sound field is altered in a step [21]. A step [22] generates a display 
image of the selected sound field, and a step [23] generates a display 
image of an on/off state of the sound field (surround) correcting mode for 
the selected sound field. A step [24] generates a display image of an 
on/off state of the equalizer mode for the selected sound field, and a 
step [25] generates a display image of an on/off state of the dynamic 
range correcting mode for the selected sound field. Thereafter, control 
goes to the next process. 
The above display can therefore be carried out in the manner described 
above. 
The control panel shown in FIG. 2 also has operation keys corresponding to 
key switches 13 for selecting settings for sound field (surround) 
characteristic processing. The 10 operation keys 34a.about.34j indicative 
of the numerals 1.about.0 double as these operation keys. 
The control panel also has operation keys corresponding to key switches 13 
for the user to change to a desired sound field. The start operation key 
33e and the four upward, downward, leftward, and rightward operation keys 
33a.about.33d double as these operation keys. 
The graphic controller (GDC) 9 of the audio equipment generates video 
signals of display images as shown in FIGS. 13A and 13B. In FIG. 13A, 
preset characteristics stored in the ROM 22 are displayed. The names of 
basic sound fields are displayed in a left-hand side of the image, and the 
on and off states of a sound field (surround) mode, an equalizer mode, and 
a dynamic range correcting mode are displayed in a right-hand side of the 
image. When the name of a desired sound field is selected with the 
operation keys 34a.about.34j, the displayed name is surrounded by a frame 
as indicated at HALL 1, for example. Audio signals can thus be processed 
in one of the 10 basic sound fields. 
The start operation key 33e is operated to display an image for setting 
characteristics as shown in FIG. 10B. When the operation keys 
33a.about.33d, for example, are operated, the characteristics of a sound 
field (surround) are variously changed. 
The characteristics of a sound field (surround) comprise parameters 
including the size of a room (the shape of a sound field), the material of 
a wall surface, the position of a seat, the level of a surround effect, 
the duration of a reverberation. Desired ones of these parameters are 
selected with the operation keys 33a, 33b. When the parameter indicative 
of the size of a room is selected, an image for setting the size of a room 
is displayed as shown in FIGS. 14A and 14B. 
Then, the operation keys 33c, 33d are operated to modify the parameter 
indicative of the size of a room, thus varying the image as shown in FIG. 
14A or 14B. In FIGS. 14A and 14B, thinner lines represent the size of a 
standard room (the shape of a sound field). As the operation keys 33c, 33d 
are operated, an image indicated by thicker lines is enlarged or 
contracted. 
The parameter indicative of the size of a room corresponds to the time for 
which reflected sounds simulated as shown in FIG. 15A or 15B endures. 
Since the representations of FIGS. 15A and 15B are difficult to 
understand, the size of a room is displayed as an image as shown in FIGS. 
14A and 14B for an easier visual recognition of the room size. 
The audio equipment thus clearly displays an image representing the shape 
of a standard sound field, which image can be enlarged or contracted as 
the parameter of the size of the sound field is modified. 
FIG. 16 shows a flowchart of a key-in process for the above operation 
display process. When the key-in process is started, a step [1] determines 
whether the operation keys 33 are operated or not. If NO, control proceeds 
to a next process. If YES, delay time data stored in the RAM 23 is read 
and set in the DSP unit 4 in a step [2]. The data is then displayed on the 
display unit 14 in a step [3], and the switch 10 is shifted to the GDC 9 
in a step [4]. 
In a step [5], the previous display data from the GDC 9 is erased. Display 
data (represented by thinner lines) of the shape of a standard sound field 
is supplied in a step [6]. Display data of the shape of a set sound field 
set is supplied in a step [7]. Then, numerical display data is supplied in 
a step [8], after which control goes to the next process. 
The above display can therefore be carried out in the manner described 
above. 
While the size of a room has been described above as the shape of a sound 
field, the present invention is also applicable to changing of the shape 
of a sound field such as a square or sectorial sound field, for example. 
The control panel shown in FIG. 2 also has operation keys corresponding to 
key switches 13 for selecting settings for sound field (surround) 
characteristic processing. The 10 operation keys 34a.about.34j indicative 
of the numerals 1.about.0 double as these operation keys. 
The control panel also has operation keys corresponding to key switches 13 
for the user to change to a desired sound field. The start operation key 
33e and the four upward, downward, leftward, and rightward operation keys 
33a.about.33d double as these operation keys. 
The graphic controller (GDC) 9 of the audio equipment generates video 
signals of display images as shown in FIGS. 17A and 17B. In FIG. 17A, 
preset characteristics stored in the ROM 22 are displayed. The names of 
basic sound fields are displayed in a left-hand side of the image, and the 
on and off states of a sound field (surround) mode, an equalizer mode, and 
a dynamic range correcting mode are displayed in a right-hand side of the 
image. When the name of a desired sound field is selected with the 
operation keys 34a.about.34j, the displayed name is surrounded by a frame 
as indicated at HALL 1, for example. Audio signals can thus be processed 
in one of the 10 basic sound fields. 
The start operation key 33e is operated to display an image for setting 
characteristics as shown in FIG. 17B. When the operation keys 
33a.about.33d, for example, are operated, the characteristics of a sound 
field (surround) are variously changed. 
The characteristics of a sound field (surround) comprise parameters 
including the size of a room (the shape of a sound field), the material of 
a wall surface, the position of a seat, the level of a surround effect, 
the duration of a reverberation. Desired ones of these parameters are 
selected with the operation keys 33a, 33b. When the parameter indicative 
of the size of a room is selected, an image for setting the material of a 
wall surface is displayed as shown in FIGS. 18A and 18B. 
Then, the operation keys 33c, 33d are operated to modify the parameter 
indicative of the material of a wall surface, thus varying the image as 
shown in FIG. 18A or 18B. FIGS. 18A and 18B illustrate the shape of a 
sound field. As the operation keys 33c, 33d are operated, the color of an 
image portion corresponding to the wall surface is varied. More 
specifically, the ratio of mixture of red (R), green (G), and blue (B) of 
the displayed color in the image portion is varied as indicated in the 
table of FIG. 19. According to the table of FIG. 19, the colors of 
materials in upper rows (softer materials) are indicated as warmer colors, 
and the colors of materials in lower rows (harder materials) are indicated 
as colder colors. 
The parameter indicative of the material of a wall surface corresponds to a 
change in the frequency characteristic (filter) with respect to initial 
reflected sounds and reverberation as shown in FIGS. 20A and 20B. Since 
the representations of FIGS. 20A and 20B are difficult to understand, the 
material of a wall surface is displayed as a change in the color of an 
image portion corresponding to the wall surface as shown in FIGS. 18A and 
18B for an easier visual recognition of the wall material. 
The audio equipment thus clearly displays an image representing the shape 
of a standard sound field, with the color of an image portion which 
corresponds to a wall surface being varied as the parameter indicative of 
the material of the wall surface is varied. 
FIG. 21 shows a flowchart of a key-in process for the above operation 
display process. When the key-in process is started, a step [1] determines 
whether the operation keys 33 are operated or not. If NO, control proceeds 
to a next process. If YES, filter coefficient data stored in the RAM 23 is 
read and set in the DSP unit 4 in a step [2]. The data is then displayed 
on the display unit 14 in a step [3], and the switch 10 is shifted to the 
GDC 9 in a step [4]. 
A step [5] supplies display data of the shape of a sound field to the GDC 
9, and a step [6] supplies color data (RGB) of the material of a wall 
surface of the set sound field to draw on an image portion corresponding 
to the wall surface. After numerical display data is supplied in a step 
[7], control goes to the next process. 
The above display can therefore be carried out in the manner described 
above. 
To set the parameter of the position of a seat, the position of the arrow 
shown in FIGS. 18A and 18B is moved forward, backward, leftward, or 
rightward. To set the parameter of the level of a surround effect, images 
representing original sound, initial reflection, and reverberation are 
displayed as shown in FIG. 22A, and the heights of the graphs indicating 
initial reflection and reverberation are varied. To set the parameter of 
the duration of reverberation, images representing original sound, initial 
reflection, and reverberation are displayed as shown in FIG. 22B, and the 
height of the graph indicating reverberation is varied. Therefore, these 
displays can clearly be produced. 
FIGS. 23A and 23B show display images for setting sound levels. FIG. 23A 
illustrates a surround level, and FIG. 23B illustrates a center level, 
both through the number of thick lines. In this manner, the sound levels 
can clearly be displayed.