JP5870653B2 - Level adjustment device and program for level adjustment - Google Patents

Description

  The technique disclosed in the present application relates to a technique for adjusting a signal level of an acoustic signal, and more particularly, to a technique for adjusting an analog acoustic signal to a suitable signal level in consideration of sound quality.

2. Description of the Related Art Conventionally, an acoustic signal processing device such as a mixer is known as a device having a mixing function of adjusting a level and sound quality of an acoustic signal and mixing a plurality of acoustic signals.
The acoustic signal processing apparatus is provided with a preamplifier for adjusting the signal level and the like of an input analog acoustic signal as a previous configuration for adjusting the mixing balance of a plurality of acoustic signals to be mixed.

The preamplifier can arbitrarily change the signal level of the input analog sound signal and the pad unit (PAD) including a fixed attenuator that attenuates the signal level of the input analog sound signal by a predetermined fixed gain. And a variable amplifying unit including a variable amplifier capable of variably amplifying or attenuating by a variable gain.
Use or non-use of the pad portion is switched according to a user instruction.
When it is instructed to use the pad section (hereinafter referred to as pad-on), the preamplifier outputs a signal via a fixed attenuator and a variable amplifier. In this case, the signal level of the input analog acoustic signal is attenuated by a predetermined amount by the fixed attenuator and amplified or attenuated by the variable amplifier.
On the other hand, when it is instructed not to use the pad section (hereinafter referred to as pad-off), the preamplifier bypasses the fixed attenuator. In this case, the signal level of the input analog acoustic signal is amplified or attenuated only in the variable amplifier.
The configuration of such a preamplifier is described in, for example, Patent Document 1, Non-Patent Document 1, and Non-Patent Document 2.

JP 2008-263410 A

“PM5D / PM5D-RHV2 / DSP5D Instruction Manual”, Yamaha Corporation, 2004 (especially p.42) “DM2000 Version2 Instruction Manual”, Yamaha Corporation, 2004 (especially p.19, 64)

  In general, an analog acoustic signal input to an acoustic signal processing apparatus may be deteriorated in sound quality through signal processing such as attenuation and amplification. For this reason, it is preferable that the acoustic signal processing apparatus outputs the input analog acoustic signal without performing signal processing such as attenuation and amplification as much as possible.

  In the preamplifier having the pad portion described in the background art, the signal level adjusted through the fixed attenuator and the variable amplifier when the pad is turned on is adjustable using only the variable amplifier when the pad is turned off. It is also possible to be in the range.

In such a situation, it is desirable in terms of sound quality that the preamplifier is pad-off and the fixed attenuator is bypassed.
However, a user who adjusts an acoustic signal using an acoustic signal processing apparatus usually performs various adjustments such as adjustment of mixing balance on a plurality of acoustic signals in addition to adjustment of a preamplifier. It has not been easy to individually recognize whether or not the input analog sound signal can be put in a pad-off state and a fixed attenuator can be bypassed. As a result, it has been a great burden on the user to change the analog sound signal recognized as being pad-off to pad-off and then readjust the variable amplifier.

  The technology disclosed in the present application has been proposed in view of the above problems, and a level adjustment device that can easily suppress deterioration in sound quality of an analog audio signal without burdening the user, and level adjustment It aims at providing the program for.

A level adjustment apparatus according to a technique disclosed in the present application includes an input port, a determination unit, and an automatic adjustment unit . The input port includes an acoustic signal input unit that inputs an acoustic signal, a fixed attenuation unit that attenuates the signal level of the acoustic signal by a fixed gain, a variable amplification unit that amplifies or attenuates the signal level of the acoustic signal by a variable gain, and fixed attenuation. A switching unit for setting whether to use the unit. The input port outputs an acoustic signal that passes through the fixed attenuating unit and the variable amplifying unit or an acoustic signal that passes through only the variable amplifying unit, depending on the setting of the switching unit. In the determination means, whether the gain given to the acoustic signal at the input port is in the overlapping range of the adjustment range when passing through the fixed attenuation unit and the variable amplification unit and the adjustment range when passing only through the variable amplification unit Determine whether or not. The automatic adjustment means sets the fixed attenuating section to non-use by the switching section and adjusts the gain of the variable amplifying section according to the fixed gain of the fixed attenuating section when it is determined by the determining means that it is in the overlapping range. To do.

The level adjusting apparatus according to the technique disclosed in the present application is the level adjusting apparatus according to claim 1, further comprising a plurality of input ports, and among the plurality of input ports, determined by the determining unit to be in the overlapping range. It comprises extracting means for extracting an input port that.

  Moreover, the level adjustment apparatus which concerns on the technique disclosed by this application is a level adjustment apparatus of Claim 1 or 2, It is provided with the alerting | reporting means which alert | reports the determination result by a determination means.

In addition, the level adjustment program according to the technique disclosed in the present application includes a fixed attenuation unit that attenuates an input acoustic signal by a fixed gain and a variable amplification that amplifies or attenuates the signal level by a variable gain. output via the part, or to output only via the variable amplification section, a control device for controlling the level adjusting device, means for obtaining a gain to be applied to the acoustic signal, the gain is obtained, fixed A determination unit that determines whether or not the adjustment range when the attenuation unit and the variable amplification unit pass through and the adjustment range that passes through the variable amplification unit alone are within the overlapping range by the determination unit. When the determination is made, automatic adjustment means for adjusting the acquired gain in accordance with the fixed gain of the fixed attenuation unit is executed only through the variable amplification unit .

  According to the level adjustment device and the program for level adjustment disclosed in the present application, it is possible to easily suppress the deterioration of the sound quality of the analog sound signal without imposing a burden on the user.

It is a block diagram which shows the digital mixer which concerns on embodiment. It is a figure which shows the structure of the signal processing performed in DSP. It is a block diagram of an analog input block provided for each analog input terminal in the analog input unit. It is a figure which shows the range which can adjust the gain of the signal level of the analog sound signal in an analog input block. It is a figure which shows the flowchart of the process which controls switching from a pad-on state (ON) to a pad-off state (OFF).

  FIG. 1 is a block diagram showing a digital mixer 1 according to an embodiment of the present application. The digital mixer 1 is an example of an acoustic signal processing device. This is a device that performs signal processing such as mixing and equalizing on a plurality of sound signals and outputs the sound signals after the signal processing. The digital mixer 1 is provided with a level adjustment function for adjusting the signal level of an input analog sound signal as a preamplifier.

  A digital mixer 1 shown in FIG. 1 includes a CPU 2, a memory 3, an external I / O 4, a display 5, an operator 6, an electric fader 7, a waveform I / O 8, and a signal processing unit (hereinafter referred to as DSP) 9. Connected by the system bus 10.

  The CPU 2 is a control device that performs overall control of the operation of the digital mixer 1. By executing a necessary control program stored in the memory 3, input / output control of data other than the sound signal in the external I / O 4 and control of input / output of the sound signal in the waveform I / O 8 are performed. In addition, an input operation of various processing parameters in the operator 6 or the electric fader 7 is detected, and various processing parameters in the digital mixer 1 are set or changed. Further, the display 5 controls the display of various processing parameter settings and changes, the operation status of each unit, and the like. The CPU 2 controls the operation of each unit using various processing parameters.

  The memory 3 stores a program storage area for storing a control program executed by the CPU 2, data to be temporarily stored during a control operation in which the control program is executed by the CPU 2, and is used as a work memory for the CPU 2 A storage device having a data storage area.

  The external I / O 4 is an interface that is connected to various externally connected devices and inputs / outputs various data other than acoustic signals. For example, an external connection device such as a mouse, a keyboard for inputting characters, an operation panel, an external display, or a USB controller is connected.

  The display 5 is a display device that displays various information according to the control of the CPU 2. For example, it is composed of a liquid crystal panel, a light emitting diode, or the like.

  The operator 6 is various operators that accept operations on the digital mixer 1 and includes various keys, buttons, a rotary encoder, a slider, a knob, and the like. The electric fader 7 is an operation element that receives an operation on the digital mixer 1 and an operation element that receives an operation mainly for controlling the signal level of an acoustic signal in an acoustic signal processing channel (hereinafter referred to as a channel). . The electric fader 7 can be automatically moved to a position corresponding to a designated value under the control of the CPU 2. Further, these controls can be realized by using a touch panel laminated on the liquid crystal panel as the display 5.

  The waveform I / O 8 is used to input sound signals from various sound sources, send the input sound signals to the DSP 9 (described later), output sound signals processed by the DSP 9 to an external sound device, and the like. Interface. The waveform I / O 8 has a plurality of analog input terminals, a plurality of analog output terminals, and the like, and inputs and outputs acoustic signals through these.

  The DSP 9 receives an acoustic signal digitally converted from the waveform I / O 8. The DSP 9 is composed of a digital signal processing circuit, and performs signal processing such as mixing, equalizing, filtering and the like on the input acoustic signal. The signal processing is controlled based on values of various processing parameters that are currently set (hereinafter, current data). The current data is set by operating the operation element 6 or the electric fader 7 and is recorded in a current memory (not shown) which is a data storage area provided in the memory 3.

  FIG. 2 is a diagram showing a configuration of signal processing mainly executed in the CPU 2, the waveform I / O 8, and the DSP 9. The waveform I / O 8 includes an analog input unit 80 and an analog output unit 82. The analog input unit 80 includes a plurality of input ports that output analog sound signals input from the input terminals to the DSP 9 and performs input of sound signals, AD conversion, and the like. The input port of the analog input unit 80 is provided for each input terminal. The analog output unit 82 includes a plurality of output ports that receive the digital sound signal output from the DSP 9, performs DA conversion of the digital sound signal, and outputs the signal to an output terminal connected to an external device. The output port of the analog output unit 82 is provided for each output terminal.

  As shown in FIG. 2, the signal processing in the DSP 9 includes an input patch unit 90, an input channel unit 91, a mix bus unit 92, an output channel unit 93, and an output patch unit 94. In this specification, the word “channel” may be expressed as “ch”.

  The input patch unit 90 assigns (patches) one of a plurality of input ports provided in the analog input unit 80 to each of a plurality of input channels provided in the input channel unit 91. . As a result, the acoustic signal input to the input port is sent to the assigned input channel. Which input port is assigned to which input channel can be arbitrarily set by the user using the operator 6 or the like, and data relating to the assignment state of each input channel and input port (current data of the input patch unit 90) is current. Stored in memory.

  The input channel unit 91 includes, for example, 128 input channels, and each input channel has the same configuration. Each input channel performs signal processing such as equalizing and filtering on the acoustic signal input from the patched input port. After performing the signal processing, an acoustic signal is transmitted to one or more of the plurality of buses provided in the mix bus unit 92. It is possible to set whether or not to send an acoustic signal to each bus provided in the mix bus unit 92 for each input channel.

  The mix bus unit 92 includes, for example, 96 buses, mixes the audio signals input from the input channels of the input channel unit 91 for each bus, and outputs the mixed audio signals to the output channel unit 93. To do. The output channel section 93 includes the same number of output channels as the bus of the mix bus section 92, and each output channel corresponds to one different bus. Each output channel performs signal processing such as equalizing and filtering on an acoustic signal input from a corresponding bus. The acoustic signal subjected to signal processing in the output channel is sent to the output patch unit 94.

  The output patch unit 94 assigns (patches) each output channel of the output channel unit 93 to any one of a plurality of output ports provided in the analog output unit 82. As a result, the acoustic signal that is signal-processed by the DSP 9 and output from each output channel is output via the analog output unit 82.

  FIG. 3 is a block diagram showing a functional block of one input port in the analog input unit 80 (hereinafter, analog input block 800). The analog input block 800 includes a bypass switch 801, a pad 802, an amplifier 803, and an analog-digital converter (hereinafter referred to as ADC) 804. The analog input block 800 corresponds to a preamplifier, and the bypass switch 801, the pad 802, and the amplifier 803 have a level adjustment function. It is assumed that the analog input units 800 of the plurality of input ports have the same configuration.

  The bypass switch 801 has a pad-on state using the pad 802 (a state connected to (ON) in FIG. 3) and a pad-off state not using the pad 802 (a state connected to (OFF) in FIG. 3). It can be switched with. The detour switch 801 is a switch for switching whether or not the pad 802 is included in the signal path of the analog acoustic signal at the input port.

  The pad 802 is a fixed attenuator that attenuates the signal level of the input analog sound signal according to a predetermined fixed gain. The user cannot change this fixed gain. The amplifier 803 is a variable amplifier that amplifies or attenuates the signal level of the input analog acoustic signal according to a variable gain. The user can adjust the variable gain using the operation element 6 or the like.

  When the bypass switch 801 is in the pad-on state (ON), the analog sound signal input to the analog input block 800 is output to the subsequent amplifier 803 after the signal level is attenuated by the fixed gain of the pad 802. On the other hand, when the bypass switch 801 is in the pad-off state (OFF), the analog acoustic signal input to the analog input block 800 is output to the amplifier 803 without passing through the pad 802.

  Switching between the pad-on state (ON) and the pad-off state (OFF) of the bypass switch 801 and the value of the variable gain of the amplifier 803 are set by the user operating the operator 6 or the like. The set values (parameter values indicating pad on / off, parameter values indicating variable gain) are stored and updated in the current memory as current data. The CPU 2 controls the bypass switch 801 and the amplifier 803 based on the current data stored in the current memory. The signal level of the analog audio signal input to each analog input block 800 is adjusted according to the state of the bypass switch 801 and the value of the variable gain of the amplifier 803, and the user adjusts the signal level output from each of the plurality of input ports. It can be adjusted substantially the same.

  The ADC 804 AD converts the analog sound signal whose signal level is adjusted to a digital sound signal.

  Note that the analog input block 800 may include other signal processing units such as phase conversion and a high-pass filter, a switch for switching use / nonuse of the input port, and the like.

  Next, the adjustable range of the signal level gain of the analog sound signal in the analog input block 800 of the input port will be described with reference to FIG. For example, the variable gain of the amplifier 803 can be continuously adjusted in the range from +60 dB to +10 dB, and the fixed attenuation factor of the pad 802 is fixed to −26 dB.

  In the pad-off state (OFF), the pad 802 is not interposed in the signal path. Therefore, in the analog input block 800, the pad 802 is not used and only the amplifier 803 is used, and the signal level of the input analog acoustic signal is used. Is adjusted. The pad-off adjustment range ROFF, which is a gain range that can be adjusted in the pad-on state (OFF), is a range from +60 dB to +10 dB, which is equal to the adjustable gain range of the variable gain by the amplifier 803.

  In the pad-on state (ON), since the pad 802 is interposed in the signal path, the analog input block 800 uses the pad 802 and the amplifier 803 to adjust the signal level of the input analog acoustic signal. . Since the pad 802 has a fixed gain of −26 dB, this adjustment range is a range in which −26 dB is attenuated with respect to the variable gain from +60 dB to +10 dB by the amplifier 803. Therefore, the gain range is adjustable in the pad-on state (ON). The pad-on adjustment range RON is a range from +34 dB to −16 dB obtained by subtracting −26 dB from +60 dB to −10 dB. That is, the pad-on adjustment range RON is always attenuated by a fixed gain of −26 dB as compared with the pad-off adjustment range ROFF.

  By switching between the pad-on state (ON) and the pad-off state (OFF), the gain adjustment range in the analog input block 800 is from +60 dB to -16 dB, which is a combination of the pad-off adjustment range ROFF and the pad-on adjustment range RON. It becomes a range.

  The range from +34 dB, which is the upper limit of the pad-on adjustment range RON, to +10 dB, which is the lower limit of the pad-off adjustment range ROFF, is the adjustment range in the pad-on adjustment range RON and the pad-off state (OFF). This is an overlapping range ROV where the gain adjustment range overlaps with the pad-off adjustment range ROFF. This overlapping range ROV is a range in which the gain can be adjusted in either the pad-on state (ON) or the pad-off state (OFF).

  In FIG. 5, the CPU 2 executes the program stored in the memory 3, so that the pad input state (analog input block 800) from the input port (analog input block 800) set in the analog input unit 80 is in the pad off state. The flowchart of the process which detects the input port which can be switched to (OFF), and performs control for switching this detected input port to a pad-off state (OFF) is shown.

  The flowchart of FIG. 5 is started when the CPU 2 receives an instruction for adjusting the state of the pad (S0). For example, the processing of the flowchart of FIG. 5 is started when the CPU 2 detects that an adjustment start switch (not shown) provided in the digital mixer 1 as one of the operators 6 has been operated. The adjustment start switch is normally operated when the user performs final adjustment of each input port after adjustment of each input port or input channel.

  When the execution of the flowchart of FIG. 5 is started, the CPU 2 first refers to the current memory and extracts an input port that can be switched from the pad-on state (ON) to the pad-off state (OFF) (S2). In step S <b> 2, an input port patched to each input channel of the input channel unit 91 is specified based on a parameter indicating a patch state in the input patch unit 90. The CPU 2 determines whether or not each specified input port satisfies the condition for switching to the pad-off state (OFF). An input port corresponding to the switching condition is extracted as an input port that can be switched from the pad-on state (ON) to the pad-off state (OFF). Here, the condition for switching to the pad-off state (OFF) is that the value of the pad on-off stored in the current memory indicates the pad-on state (ON) at the input port, and the fixed gain of the pad 802 and the amplifier 803 This is a case where the value of the total gain in the preamplifier (which is the sum of the two gains) determined by taking into account two gains with the set variable gain indicates a value included in the overlapping range ROV. In other words, in this step S <b> 2, it is determined whether or not the gain for the acoustic signal input to the input port is an adjustable gain using only the amplifier 803.

  In step S4, it is confirmed whether or not an input port that can be switched to the pad-off state (OFF) is extracted in step S2. If the input port is extracted (S4: YES), it is extracted in step S2. The process proceeds to a process (S6) for adjusting the switching to the pad-off state (OFF) for all the input ports. In step S6, the CPU 2 performs a switching adjustment process to the pad-off state (OFF) for all the input ports extracted in step S2, and thereafter, the process of the flowchart of FIG. 5 ends (S8). In the adjustment process for switching to the pad-off state (OFF) in step S6, the CPU 2 changes the value of the parameter indicating the pad on-off stored in the current memory from the pad-on state (ON) to the pad-off state (OFF) for the input port to be adjusted. And the parameter value indicating the variable gain of the amplifier 803 is adjusted and updated. Here, the value of the parameter indicating the variable gain of the amplifier 803 corresponds to the fixed gain (−26 dB) of the pad 802 deviated from the signal path due to switching to the pad-off state (OFF). Is increased (+26 dB), and the total gain at the input port to be adjusted is adjusted so as not to change before and after the switching adjustment process. On the other hand, if no input port has been extracted in step S3 (S4: NO), the process of the flowchart of FIG. 5 ends without performing the switching adjustment process for any input port (S8).

  In the flowchart shown in FIG. 5, the case where the process is started by an instruction by a switch or the like provided in the operation element 6 is illustrated, but the present application is not limited to this. The process may be started by another method or timing different from the exemplified method or timing.

  Moreover, although the case where the total gain value in the preamplifier is adjusted to the overlapping range ROV is exemplified in step S2 as one of the conditions for switching to the pad-off state (OFF), the present application is not limited to this. Instead of the overlapping range ROV, the overlapping range ROV1 obtained by removing the gain range of the lower limit region from the overlapping range ROV may be used as a condition.

  As shown in FIG. 4, a range excluding the range RM in the lower limit range of the range of the overlapping range ROV is defined as the overlapping range ROV1. The range RM is a range up to the gain adjustment value A with +10 dB being the lower limit of the pad-off adjustment range ROFF (FIG. 4).

  For example, the range RM excluded as a margin is a range of 1/2 or less with respect to the overlapping range ROV. Further, it is preferably about 6 dB. Although the gain value is set in advance during rehearsal or the like, fine adjustment may be necessary in the present application. The fine adjustment value is preferably about 6 dB. In general, it is advantageous from the viewpoint of improving sound quality that as many analog input blocks 800 as possible can be switched to the pad-off state (OFF), and in this respect, the overlapping range ROV1 is preferably a range having a large width, Even if the gain value has already been adjusted over time such as rehearsal and actual time, fine adjustment may be necessary again, and it is necessary to secure a margin in the overlapping range ROV1. It is desirable to set a margin when setting the overlapping range ROV1 in consideration of such circumstances.

  Further, not only the lower limit of the overlapping range ROV but also the upper limit of the overlapping range ROV may have a margin for fine adjustment. That is, the upper limit of the pad-on adjustment range RON (FIG. 4) +34 dB is set as the upper limit, and the range up to the gain adjustment value with a predetermined gain lower is excluded from the overlapping range ROV as a margin.

  In the process of step S2, the procedure for extracting an input port that can be switched to the pad-off state (OFF) is not limited to the aspect described above. For example, regardless of the parameter indicating the patch state in the patch unit 91, it is determined whether or not all input ports satisfy the switching condition to the pad-off state (OFF), and the corresponding input port pad-off state (OFF). The input port may be extracted as a switchable input port. Or you may make it determine whether it corresponds to the switching conditions to a pad-off state (OFF) independently for each input port.

  Moreover, although the case where switching from the pad-on state (ON) to the pad-off state (OFF) and the adjustment of the variable gain of the amplifier 803 are performed in step S6 is illustrated, the present application is not limited to this. For example, in step S6, a notification process for notifying the user of an input port (or an input channel patched to the input port) that can be switched to the pad-off state (OFF) is performed, and the pad-off state is switched from the pad-on state (ON). Switching to (OFF) and adjusting the variable gain of the amplifier 803 may be performed by the user operating the operation element 6 or the like. Notification methods include notification using the display 5 (display by a pop-up window or the like when the display 5 is a liquid crystal panel, lighting when the display 5 is a light emitting element such as a light emitting diode), sound, and the like. Various forms such as a notification by the above or a display using a mechanical means can be adopted.

  In addition, the adjustment process and the notification process in step S6 may be appropriately combined, or may be a process of waiting for an instruction whether to perform the adjustment process after the notification of the notification process. In this case, the user can manually switch to the pad-off state (OFF) and adjust the variable gain of the amplifier 803 in addition to selecting the automatic adjustment process in step S6. Alternatively, the notification process may be performed together with the adjustment process to notify the user of the extracted input port or the adjusted input port.

  As described above, according to the flowchart shown in FIG. 5, after completion of the adjustment of the target level, each input port (analog input block 800) is in the pad-on state (ON) according to the switching condition to the pad-off state (OFF). The input port that can be switched from the pad to the pad-off state (OFF) is extracted. The condition for switching to the pad-off state (OFF) is a case where adjustment is performed in the pad-on state (ON) and the total gain value of the preamplifier is adjusted to the overlapping range ROV or ROV1. An input port corresponding to this condition is found. Further, after the extraction, the input port corresponding to the switching condition is subjected to switching adjustment processing to the pad-off state (OFF). Thereby, without using a burden on the user, for each input port (analog input block 800), if necessary, the usage status of the pad of each analog input block 800 is confirmed, and in the case of the pad on state (ON), It is possible to determine whether or not the pad can be switched off (OFF).

Needless to say, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made without departing from the spirit of the present invention.
For example, the level adjusting apparatus according to the present application can be applied not only to a digital mixer but also to an arbitrary acoustic signal processing apparatus that inputs an analog acoustic signal, such as a synthesizer, a recorder, an effector, and an amplifier. In the above embodiment, the analog input unit 80 and the analog output unit 82 are described. However, as shown by the broken line in FIG. 3, the digital input unit 81 and the digital output unit 83 may be included. Further, the level adjusting device according to the present application is not limited to a digital mixer, and a function for controlling a preamplifier for inputting an analog sound signal is also applied to devices such as an analog mixer, a personal computer, a mobile phone, a portable game device, and a television. If it has, it is applicable. In addition to being mounted on an acoustic signal processing device or other devices, it can be implemented as a single level adjusting device.

The input terminal is an example of an acoustic signal input unit, the pad 802 is an example of a fixed attenuation unit, the amplifier 803 is an example of a variable amplification unit, the detour switch 801 is an example of a switching unit, step S2 is an example of a determination unit, and the analog input unit 80 is An example of the level adjustment device, the pad-on adjustment range RON is an example of a first level adjustment range, and the pad-off adjustment range ROFF is an example of a second level adjustment range.
It is an example.

Hereinafter, aspects of the present invention that are not described in the claims are summarized.
As a first aspect of the present invention relating to the level adjustment device according to any one of claims 1 to 4, the determination means according to claim 1 is a first level when passing through a fixed attenuating unit and a variable amplifying unit. The adjustment range is compared with the second level adjustment range when passing through the variable amplification unit, and the fixed attenuation is obtained when the target level is in the overlapping range included in both the first level adjustment range and the second level adjustment range. It is characterized in that it is determined that adjustment with a variable amplifier is possible without including a device.
As a second aspect of the present invention, the determination means described in the level adjustment device according to the first aspect described above is when the target level is in a range excluding the range of the lower limit region of the second level adjustment range from the overlapping range. And determining that adjustment with a variable amplifier is possible without including a fixed attenuator.

1 Digital mixer 2 CPU
3 Memory 4 External I / O
5 Display 6 Operator 7 Electric fader 8 Waveform I / O
9 DSP
10 System Bus 800 Analog Input Block 801 Detour Switch 802 Pad 803 Amplifier 804 ADC

Claims (4)

An acoustic signal input unit that inputs an acoustic signal; a fixed attenuation unit that attenuates the signal level of the acoustic signal by a fixed gain; a variable amplification unit that amplifies or attenuates the signal level of the acoustic signal by a variable gain; and A switching unit for setting whether or not to use a fixed attenuation unit, and depending on the setting of the switching unit, the acoustic signal or the variable amplification unit via the fixed attenuation unit and the variable amplification unit An input port for outputting the acoustic signal via only,
The gain given to the acoustic signal at the input port is in an overlapping range of an adjustment range when passing through the fixed attenuation unit and the variable amplification unit and an adjustment range when passing only through the variable amplification unit. Determination means for determining whether or not,
When it is determined by the determination means that it is in the overlapping range, the switching unit sets the fixed attenuation unit to be unused, and the gain of the variable amplification unit is set according to the fixed gain of the fixed attenuation unit. An automatic adjustment means for adjusting the level adjustment device. A plurality of input ports;
The level adjustment apparatus according to claim 1, further comprising: an extraction unit that extracts an input port that is determined to be within the overlapping range by the determination unit among the plurality of input ports. The level adjusting apparatus according to claim 1, further comprising a notifying unit that notifies a determination result by the determining unit. The input acoustic signal is output via a fixed attenuating unit that attenuates the signal level by a fixed gain and a variable amplifying unit that amplifies or attenuates the signal level by a variable gain, or only through the variable amplifying unit. To the control device that controls the level adjustment device that outputs,
Means for obtaining a gain to be applied to the sound-signal,
Determination means for determining whether or not the acquired gain is in an overlapping range of an adjustment range when passing through the fixed attenuation unit and the variable amplification unit and an adjustment range when passing only through the variable amplification unit and,
An automatic adjustment unit that adjusts the acquired gain according to a fixed gain of the fixed attenuation unit via only the variable amplification unit when it is determined by the determination unit to be in the overlapping range; Program to execute />.

Images