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JPH01143516

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DESCRIPTION JPH01143516
[0001]
A. Industrial Field of Application The present invention relates to a digital signal processing
apparatus used, for example, when manipulating the frequency characteristics of an analog
signal corresponding to an input digital audio signal. B1 Outline of the Invention The present
invention is a digital signal processing apparatus comprising: a signal processing device for
processing and outputting a digital signal represented by two types of variable axes to be input;
and control means for controlling the signal processing device In the apparatus, the control
means scans at one predetermined variable axis representing a digital signal at a predetermined
speed, and the other variable axis is determined based on the input operation signal, and a signal
based on these two variables. By controlling the processing device, it is possible to provide a
digital signal processing device capable of manipulating signal characteristics quickly and
accurately by a simple operation. C0 Prior Art Conventionally, there has been proposed a digital
signal processing apparatus which receives a digital signal represented by two types of variable
axes and processes the digital signal. As such a digital signal processing apparatus, for example, a
digital acoustic signal is input, and by processing frequency data representing the digital acoustic
signal and sound pressure level data, an analog acoustic signal corresponding to the digital
acoustic signal can be obtained. There are devices that manipulate the frequency characteristics
represented by two variable axes of frequency and sound pressure level. As shown in FIG. 5, this
apparatus has an operation unit 101 operated manually, and an input device 102 for outputting
an operation signal corresponding to the manual operation of the operation unit 101, and the
operation signal Control means 103 for supplying a control signal to be supplied based on the
operation signal, and the digital acoustic signal being input and the control signal being supplied,
a signal based on the control signal for the digital acoustic signal It comprises the signal
processing device 104 which performs processing and outputs it. For example, as shown in FIG.
6, the operation unit 101 includes first and second rotary volume knobs 101a and 101b. The
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first rotary volume knob 101a is for selecting a frequency band of a predetermined width in the
analog sound signal. The second rotary volume knob 101b is for adjusting the sound pressure
level of the signal of the frequency band selected by the first rotary volume knob 101a. That is,
the frequency band is selected by the first rotary volume knob Iota, and the sound pressure level
is adjusted by the second rotary volume knob 101b in correspondence to each of the selected
frequency bands, whereby the analog audio signal is selected. Frequency characteristics are
manipulated.
Alternatively, as shown in FIG. 7, the operation unit 101 is provided with a plurality of slide
volume knobs 10IC corresponding to the respective frequency bands of the predetermined width
in the analog sound signal. In such an operation unit 101, the sound pressure level of the signal
of the frequency band corresponding to each slide volume knob in the analog audio signal is
adjusted by operating the plurality of slide volume knobs 101c, and the analog audio signal is
processed. The frequency characteristics of are manipulated. By the way, in the digital signal
processing apparatus as described above, the operation for making the signal processing by the
signal processing apparatus 104 into a desired state is a complicated and time-consuming
operation. There is. That is, in the digital signal processing apparatus having the first and second
rotary volume knobs 101a and 101b, in order to sequentially adjust and set each frequency
band, it is long to complete the adjustment for all frequency bands. It takes time, and it is difficult
to grasp the overall state of the frequency characteristics of the analog acoustic signal. Further,
in the digital signal processing apparatus provided with the plurality of slide volume knobs 101c,
it is necessary to provide the slide volume knobs 101c as many as the number of the frequency
bands. Therefore, when the width of one frequency band is narrowed and the number of
frequency bands is increased to, for example, several hundred bands to about 1000 bands, the
number of slide volumes 101c is increased. It becomes a thing. Also, it takes a long time to adjust
all frequency bands. Therefore, the present invention is proposed in view of the above-mentioned
situation, and copes with digital signals inputted quickly and accurately by simple operation
without causing the enlargement of the apparatus and the increase in price. It is an object of the
present invention to provide a digital signal processing apparatus capable of manipulating signal
characteristics of an analog signal. Means for Solving the E0 Problem In order to solve the above
problems and achieve the above object, the digital signal processing device according to the
present invention receives a digital signal represented by at least two types of variable axes, A
signal processing apparatus for processing and outputting the digital signal based on a control
signal supplied from the control means, an input device for supplying an operation signal to the
control means, and a mode for supplying a mode switching signal to the control means Switching
means for scanning the variable axis representing the digital signal at a predetermined speed
based on the mode switching signal, and determining the other variable axis based on the
operation signal And controlling the signal processor with a control signal based on these two
variables.
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In the digital signal processing apparatus according to the present invention, one of the two
types of variable axes representing the input digital signal is scanned at a predetermined speed
by the control means, and only the other is scanned from the input device. Since the input may
be performed, the signal characteristics of the analog signal corresponding to the digital signal
can be accurately set to a desired state by a simple and quick operation without causing the
enlargement of the device. G. Examples Hereinafter, specific examples of the present invention
will be described with reference to the drawings. In this example, the present invention performs
digital signal processing for manipulating the frequency characteristics of an analog audio signal
corresponding to the digital audio signal by processing frequency data and sound pressure level
data representing the input digital audio signal. The example applied to the apparatus is shown.
As shown in FIG. 1, this digital signal processing apparatus performs signal processing based on
a control signal on a digital audio signal manually input and outputs the signal processing
apparatus 1, and outputs the control signal to the signal processing apparatus 1. It has CPU2
which becomes a control means to supply. Further, an input device 3 for supplying an operation
signal to the CPU 2, a mode switching means 4 for supplying a mode switching signal to the CPU
2, and a display 5 for displaying predetermined information under the control of the cpU 2 Be
equipped with. The digital acoustic signal Do is manually input to the input terminal 1 a of the
signal processing device 1. The signal processing apparatus 1 processes two variable axes of
frequency data representing the digital acoustic signal DO and sound pressure level data, and
outputs the processed signal from the output terminal 1b as a digital acoustic signal D1. The CPU
2 generates a control signal based on the operation signal supplied from the input device 3 and
the mode switching signal supplied from the mode switching means 4, and supplies the control
signal m to the signal processing device 1. Thus, the signal processing by the signal processing
unit 21 is controlled. The input device 3 comprises an input fader 3a and an A / D converter 3b.
As shown in FIG. 2, the human-powered fader 3a has sound pressure level adjusting and
frequency band selecting faders 6a and 6b, and the output signal by manual operation of each of
the faders 6a and 6b is A / D converter 3b. The A / D converter 3 b converts an output signal
sent from the human power fader 3 a into an operation signal and sends it to the CPU 2. The
operation signal is converted into a digital signal so as to be input to the CPU 2.
The mode switching means 4 has a plurality of input keys as shown in FIG. 2, and sends a mode
switching signal to the CPU 2 based on the operation of the input keys. The input key is a relative
mode selection key 7a, a light mode selection key 7b, an auto scan mode selection key 7c, a scan
start frequency band designation key 7d, a scan end frequency band designation key 7e, a scan
start key 7f, and a numerical value input key. (Numeric keypad) 7 g. The display device 5 has a
display unit 8 comprising, for example, a so-called CRT, a liquid crystal display plate or the like.
As shown in FIG. 2, the display unit 8 has a frequency axis 8x as a horizontal axis and a vertical
axis as a vertical axis. The sound pressure level axis 8y is displayed. Further, the display device 5
displays the processing characteristic of the signal processing device 1 expressed by the two axes
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8xs 8y by the graph display 8g based on the control signal supplied from the CPU 2.
Furthermore, a cursor indication 8C indicating the frequency band selected by the input device 3
or the mode switching means 4 is displayed on the frequency axis 8x, and a mode indication 8m
for displaying the mode selected by the switching means 4 is predetermined. It is displayed in the
position. When the digital signal processing apparatus is activated, the CPU 2 performs a
predetermined operation as shown in the flowcharts of FIGS. 3 and 4. In other words, in step stl
of FIG. 3, it is checked whether the light mode selection key 7b is operated. If it is not operated,
the process goes to step st2. If it is operated, the process goes to step st3. In step 2, it is checked
whether the auto scan mode selection key 7c is operated. If it is not operated, the process returns
to the step stl. If it is operated, the process goes to step 5tlQ in FIG. When the light mode
selection key 7b is operated, the set position of the frequency band selecting fader 6b is checked
at step st3 (and the operation signal is inputted. In step st4, a control signal corresponding to the
set position of the frequency band selecting fader 6b is sent to the display device 5, the cursor
display 8C is displayed, and the mode display 8m is displayed to indicate that the light mode is
selected. indicate. In step st5, the setting position of the sound pressure level adjusting fader 6a
is checked to input an operation signal. In step st6, it is checked which of the relative mode and
the absolute mode is selected by the relative mode selection key 7a.
The relative mode is a mode in which a new frequency characteristic is set by adding a desired
sound pressure level to the frequency characteristic based on the frequency characteristic set
before operation. The absolute mode is a mode in which a new frequency characteristic is set
regardless of the frequency characteristic set before operation L. If the absolute mode is selected,
the process goes to step st7. If the relative mode is selected, the process goes to step 5t13. In
step st7, the mode display 8m indicating that the absolute mode is selected is displayed, and the
sound pressure level of the frequency band selected by the frequency band selecting fader 6b is
the sound pressure level adjusting fader 6a. A control signal is generated and sent to the signal
processing device 1 so that the sound pressure level corresponding to the setting position of the
signal processing device 1 is obtained, and the line (step ST9) In step st3, the mode display 8m
indicating that the relative mode is selected is displayed, and the sound pressure level of the
frequency band selected by the frequency band selecting fader 6b is the sound pressure set at
that time. An l1m signal is generated and sent to the signal processing device 1 so that the sound
pressure level becomes the sound pressure level obtained by adding the sound pressure level
corresponding to the setting position of the sound pressure level adjusting fader 6a to step st9.
In step st9, the control signal is sent to the display 5, the graph display 8g is displayed, and the
process returns to step stl. When the step 5tlQ in FIG. 4 is performed by operating the auto scan
mode selection key 70 in the step st2, the mode display 8m indicating that the auto scan mode is
selected is displayed, A scan start frequency band is input by the numerical value input-7 g and
the scan start frequency band designation key 7 d, and this frequency band is set as the selected
frequency. At step 5t11, a scan end frequency band is input by the numerical value input-7g and
the scan end frequency band designation key 78. In step 3t12, it is checked whether the scan
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start key 7f is operated. If it is not operated, the process stops at step 5t12. If it is operated, the
process proceeds to step 5t13. At step 5t13, a control signal corresponding to the set frequency
band is sent to the display value W5, and the cursor 8C is displayed. In step 5t14, the setting
position of the sound pressure level adjusting fader 6a is checked, and an operation signal is
input.
In step 5t15, it is checked which of the relative mode and the absolute mode is selected by the
relative mode selection key 7a. If the absolute mode is selected, the process goes to step 5t16. If
the relative mode is selected, the step Go to 5t17. In step 5t15, the mode display 8m indicating
that the absolute mode is selected is displayed, and the sound pressure level of the set frequency
band corresponds to the setting position of the sound pressure level adjusting fader 6a. A control
signal is generated so as to be at the pressure level and sent to the signal processing device 1,
and the process goes to step 5t18. In step 5t17, the mode display 8m indicating that the relative
mode is selected is displayed, and the sound pressure level of the set frequency band is adjusted
to the sound pressure level set at that time. A control signal is generated and sent to the signal
processing device 1 so that the sound pressure level becomes equal to the sound pressure level
corresponding to the setting position of the fader 6a, and the line (step 5tl13). In step 5t18, the
control code m * is sent to the display unit 5, the graph display 8g is displayed, and the process
goes to step 5t19. In step 5t19, the progress of the program is stopped for a predetermined time.
In step 5t2Q, a predetermined frequency is added to the set frequency band, and a new
frequency band is set as the selected frequency band. In step 5t21, the frequency band set in
step 20 is compared with the scan end frequency band, and if the set frequency band is equal to
or less than the scan end frequency band, the process returns to step 5t13 and is set. If the
existing frequency band exceeds the above scan end frequency band, the program ends. A
procedure of processing the input digital sound signal and manipulating the frequency
characteristic of the analog sound signal corresponding to the digital sound signal in the digital
signal processing apparatus configured as described above will be described. First, either the
relative mode or the absolute mode is selected by the relative mode selection key 7a. First, in
order to operate the frequency characteristic in the light mode, the light mode selection key 7b is
operated, and with the operation continued, the sound pressure level adjusting fader 6a and the
frequency band selection kneader 6b are selected. Manipulate. In accordance with the operation
of the frequency band selection fader 6b, the cursor display 8C is moved on the display unit 8.
Then, by operating the sound pressure level adjusting fader 6a-G, the signal processing device l is
controlled so that the sound pressure level in the frequency band indicated by the cursor display
8C changes, and the graph The portion corresponding to the cursor display 8C of the display 8g
moves. At this time, in the relative mode, the sound pressure level is set by adding the sound
pressure level input by the sound pressure level adjusting fader 6 a to the frequency
characteristic set before the light mode is selected. Be done. Then, in the case of the absolute
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mode, the sound pressure level input by the sound pressure level adjusting fader 6a is set
regardless of the frequency characteristic set before the light mode is selected. Next, in order to
operate the frequency characteristic in the auto scan mode, the auto scan mode selection key 7c
is operated. Then, a scan start frequency band is specified using the numerical value input
oyster-7 g and the scan start frequency band specification key 7 d. Further, a scan start
frequency band is designated using the numerical value input oyster-7 g and the scan end
frequency band designation key 7 e. When the scan start key 7f is operated, a scan of the
frequency axis from the scan start frequency band to the scan end frequency band is performed.
Along with this scanning, the cursor display 8G moves from the position indicating the scan start
frequency band to the position indicating the scan end frequency band. By operating the sound
pressure level adjusting fader 6a while the cursor display 8C is moving, the sound pressure level
of the frequency band indicated by the cursor display 8C is equal to that of the sound pressure
level adjusting fader 6a. The signal processing device 1 is controlled to change in response to the
operation, and the portion of the graph display 8g corresponding to the cursor display 8C is
moved. At this time, in the relative mode, the sound pressure level obtained by adding the sound
pressure level input by the sound pressure level adjusting fader 6 a to the frequency
characteristic set before the auto scan mode is selected is It is set. Then, in the case of the
absolute mode, the sound pressure level input by the sound pressure level adjusting fader 6a is
set regardless of the frequency characteristic set before the auto scan mode is selected. In the
above-described auto scan mode, the speed at which the frequency axis is scanned can be
adjusted by changing the time for stopping the progress of the program at step 3t19 in the
flowchart shown in FIG.
As described above, in the digital signal processing apparatus according to the present invention,
one of the two types of variable axes expressing the input digital signal is scanned by the control
means at a predetermined speed, It is sufficient to input only from the input device. Therefore,
for example, if the present invention is applied to a device that receives a digital acoustic signal
represented by frequency data and sound pressure level data and manipulates the frequency
characteristic of an analog acoustic signal corresponding to this digital acoustic signal, Even if
the width is narrowed to increase the number of frequency bands, the size of the device does not
increase and the operation procedure does not become complicated. That is, the present
invention provides a digital signal processing apparatus capable of accurately setting the signal
characteristics of the above analog signal to a desired state by a simple and quick operation
without causing the enlargement of the apparatus. .
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a block diagram showing the configuration of a digital signal processing apparatus
according to the present invention, and FIG. 2 is a high power fader of the input device of the
digital signal processing apparatus, an input key of mode switching means and a display unit of a
display device. FIGS. 3 and 4 are flowcharts for explaining the operation of the CPU serving as
the control means of the digital signal processing apparatus, and FIG. 3 shows the operation in
the light mode. FIG. 4 shows the operation in the auto scan mode.
FIG. 5 is a block diagram showing the configuration of the conventional digital signal processing
apparatus, FIG. 6 is a front view showing an example of the configuration of the operation unit of
the conventional digital signal processing apparatus, and FIG. It is a front view which shows the
other example of a structure of the operation part of a signal processing apparatus. 1 и и и и и и и и и и и
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и и и и и и и и и и и и и. ........ Display device
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