JP2001143208A - Control/recording method of acoustic signal level and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to detect correction data (gain adjusting value) of a level for calculating an absolute value of the input signal level when a recorded magnetic tape is reproduced, by correcting and holding the input level so that the input signal level to a recorder does not become too high or too low. SOLUTION: By a changeover control part 108, a pertinent channel is selected from multichannel acoustic signal inputs, and the acoustic signal input level is measured by a level measuring part 104, and the level correcting value is calculated by a control part 107 based on the decision result of the comparison made between the measured value and an optionally set specific value. Then the level is corrected through a level control part 105, and the acoustic signal input level is again measured by the control part 107 to detect that it is within the specified value, and log data including the measured value and level correcting value are recorded on a recording part 110 by a data output part 109.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal level control recording method and apparatus for monitoring an input signal level when recording an audio signal on a recorder and performing level control.

[0002]

2. Description of the Related Art An example of a conventional audio signal level control recording apparatus will be briefly described with reference to FIG. The sensor 50 recorded on the magnetic tape of the tape recorder 503
AGC (Au) for automatically controlling the level of an excessively large or small acoustic signal on a magnetic tape is usually provided in a device for reproducing the acoustic signal obtained from the audio signal 5 and analyzing the acoustic level later.
to Gain Control) circuit. However, since the control level is not recorded on the magnetic tape, it is impossible to analyze the sound level at the time of reproduction.

[0003] That is, the analysis of the sound level requires manual adjustment and recording. Specifically, the amplifiers 502 (1 to 10) are connected between the sensors 505 (1 to 10) and the tape recorder 503 without using the AGC function of the tape recorder, and the tape recorder 50 is connected.
3 by monitoring the level meter 504 to determine whether the input level to each channel (CH1 to CH10) is within the optimum recording level range. Then, when the sound level is out of the range, the gain of the amplifying section 502 (1 to 10) of the corresponding channel is adjusted, a sound signal of an appropriate level is input to the tape recorder 503, and the gain setting value and the setting time are further set. Recording work was needed.

[0004]

As described above, conventionally, monitoring the input level of a tape recorder, maintaining the optimum recording level of the input level, adjusting the gain of the amplifier, and recording the gain set value and the set time are manually performed. In this case, the operation of adjusting the input level for multiple channels at the same time involves a very complicated operation. Therefore, the cost is expected to increase due to an increase in the number of workers, and the reliability of the recorded data is reduced due to human error, and the credibility of the sound level analysis data is questioned.

The present invention has been made in view of the above circumstances, and measures a sound signal input level by selecting a corresponding channel from multi-channel sound signal inputs, and measures the measured value and an arbitrarily set standard value. The level correction value is calculated based on the result of the comparison, and the level correction is performed.Then, the sound signal input level is measured again to detect that it is within the standard value, and the measured value and the level correction value are calculated. An object of the present invention is to provide an audio signal level control recording method and apparatus that can automatically and automatically detect and record a level control and a gain setting value by recording log data including the same. .

[0006]

According to a first aspect of the present invention, there is provided an audio signal level control recording method for monitoring an input level when recording an audio signal of a multi-channel by monitoring an input level. Used in an audio signal level control recording device that performs level control, selects a corresponding channel from the audio signal input, measures an audio signal input level, and compares the measured value with an arbitrarily set standard value. A level correction value is calculated based on the result, the level is corrected, the sound signal input level is measured again, it is detected that the value is within the standard value, and the measured value and log data including the level correction value are obtained. Recording and switching the channel.

According to a second aspect of the present invention, there is provided the acoustic signal level control recording method according to the first aspect, wherein the log data including the measured value and the level correction value when the value is out of the standard value. It is characterized by recording. Further, the sound signal level control recording method according to claim 3 is a method according to claim 1.
3. The method according to claim 1, wherein the log data further includes at least one of a channel and time data.

As described above, according to the present invention, in order to calculate the absolute value of the input level of the audio signal recorded on the magnetic tape, the input level range of the audio signal is arbitrarily set instead of the AGC function of the recorder. And a sound signal level control recording device for controlling the sound signal level. In supplying the output to the recorder, under the control of the control unit, input switching, level measurement, level control, output switching are performed, and the level correction is performed on the amplifier connected between the sensor and the recorder, and the channel, The log data including the time, the level correction, and the level data is output to the data output unit and logged out to the recording unit. That is, by disposing an audio signal level control recording device for performing level control and detection and recording of a gain set value at a stage preceding the recorder, it becomes possible to analyze an audio level at the time of reproduction.

A sound signal level control recording device according to a fourth aspect of the present invention is an audio signal level control recording device for monitoring the input level when recording multi-channel audio signals and controlling the level of an amplifier. The switching unit that selects the corresponding channel from the audio signal input of the channel, the level measurement unit that measures the audio signal input level of the selected channel each time, and compares the measured value with an arbitrarily set standard value. A level control unit for determining whether or not level correction is necessary, a level control unit for calculating a level of correction when it is determined that level correction is required, and performing a level correction. And an output unit for recording log data including the measured value and the level correction value when it is detected that there is an error.

According to a fifth aspect of the present invention, in the audio signal level control recording apparatus according to the fourth aspect, the switching unit further includes an output switching unit for selectively switching the amplification unit. Features. Furthermore, in the sound signal level control recording device according to claim 6, in the device according to claim 4, the amplifying unit further includes an amplifying circuit that controls a level of the acoustic signal, and a new level correction circuit for the amplifying circuit. Even if no signal is input, the previous level correction value is retained,
A level correction value holding circuit for changing the level correction value by a reset signal supplied via the output switching unit when the level measurement value is determined to be out of specification.

In the above configuration, when audio signals are input simultaneously for multiple channels, the input signals are input to the input switching unit via the amplifying unit. In the input switching unit, one of the multi-channel data is selected by the input switching signal instructed from the control unit to the switching control unit, the input signal is measured by the level measurement unit, and the level measurement value is transmitted to the control unit. I do. The control unit compares it with a preset level specification value,
If the result is out of specification, a level correction value is sent to the level control unit. The level control unit converts the signal into a level correction signal and a reset signal and sends the signal to the output switching unit. The output switching unit sends the level correction signal and the reset signal to the amplification unit of the same channel as the input switching unit and performs gain correction.

Next, in order to confirm whether or not the gain correction result is within the standard, the input signal passes through the input switching unit again, is measured again by the level measuring unit, and the control unit determines whether the input signal level is within the standard or not. I do. If it is within the standard, log data (measurement data and channel, time data, correction data) is sent to the data output unit. The data output unit sequentially stores the log data, sends the record data to the recording unit, and logs out.
When the gain correction of the channel is completed, the control unit sends an input switching signal to the input switching unit via the switching control unit and sends an output switching signal to the output switching unit to perform measurement of the next channel. Perform switching. By repeating the above series of operations, it is possible to detect the absolute value of the input signal level from the magnetic tape during reproduction.

As a result, the detection and recording of the gain adjustment value, which cannot be performed by the conventional AGC, can be integrated and managed by the control unit, and the absolute value of the input level of the acoustic signal recorded on the magnetic tape can be calculated. Human errors due to work and the like can be eliminated, reliability can be improved, and cost can be significantly reduced.

[0014]

FIG. 1 is a block diagram showing an embodiment of an audio signal level control recording apparatus according to the present invention. In the figure, 101 (1 to n) is a sensor 112 (1 to n).
These are, for example, respective input points for inputting sound signals equivalent to the number of channels obtained from underwater sensors that detect sea and underwater sounds to the sound signal level control recording device of the present invention. Reference numeral 102 (1 to n) denotes an amplification unit. The amplification units 102 (1 to n) receive the level correction signal supplied through the output switching unit 106, amplify the input audio signal level, and output the tape recorder via output points 111 (1 to n). 113.

Any one of the amplifiers 102 (1 to n)
FIG. 2A shows a schematic configuration of the amplifier 102 for the channels. The level correction signal received from the output switching unit 106 is
Via the level correction value holding circuit 212, the signal is sent to the amplifier circuit 211 having the function of varying the gain level. The level of the acoustic signal input by the amplification circuit 211 (input point 10
1) is changed and output (output point 111). As long as the reset signal is not input to the level correction value holding circuit 212, the level set value is updated without rewriting the level correction value to the amplifier circuit 211, and keeps the previous level correction data. That is, when the reset signal is sent from the output switching unit 106 simultaneously with the level correction signal, the level correction value to the amplifier circuit 211 is updated.

The description returns to FIG. Reference numeral 103 denotes an input switching unit. The input switching unit 103 selects an input channel from an input switching signal obtained from the switching control unit 108, as schematically shown in FIG.
To n) are sent to the level measurement unit 104. Level measuring section 104 measures the level of the amplified signal, and sends the measured value to control section 107. The level measurement unit 104 has been known in the related art, and is not directly related to the present invention.

Reference numeral 105 denotes a level control unit. The level control unit 105 sends the level correction value from the control unit 107 to the output switching unit 106 as a level correction signal and a reset signal. 106 is an output switching unit. Output switching unit 106
2C, an output channel is selected by an output switching signal output via a switching control unit 108, and a level correction signal and a reset signal obtained from a level control unit 105 are shown in FIG. To each amplification unit 102 (1 to
n). 107 is a control unit. Control unit 107
Compares the level measurement value with a preset standard value, and sends a level correction value to the data output unit 109 only when the result is out of the standard value, or compares the level measurement value with the preset standard value. The log data is sent to the data output unit 109 only when the comparison result is within the standard. This is a choice. Then, an input / output switching signal is transmitted to the switching control unit 108 for selecting the next channel.

Reference numeral 108 denotes a switching control unit. Switching control unit 1
08 simultaneously sends an input switching signal and an output switching signal in response to an input / output switching signal. Reference numeral 109 denotes a data output unit.
The data output unit 109 instructs the recording unit 110 to store the log data, and sends out the recording data. 110 is a recording unit. The recording unit 110 logs out (prints) the recording data. Reference numeral 111 (1 to n) denotes an output point, which is a final output stage of the audio signal level control recording device of the present invention. Reference numeral 113 denotes a tape recorder, and the audio signal control and recording apparatus of the present invention uses this tape recorder 113.
Is provided at the preceding stage.

Hereinafter, the operation of the embodiment of the present invention shown in FIGS. 1 and 2 will be described in detail. First, a sensor input channel, a channel switching time, an optimum input level (standard value) to the tape recorder 113, a gain default value for each (1 to n) of the amplifier 102, Set the initial value of the switching initial channel. The signals output from the sensors 112 (1 to n) are
The signals are supplied to input points 101 (1 to n), and the signals are supplied to the respective amplifying units 102 (1 to n). Amplifier 10
In 2 (1 to n), the initial gain is transmitted at 0 dB. The input signal is supplied to the input switching unit 103, and the input switching unit 103 supplies an initial setting, for example, an input signal of channel 1 to the level measurement unit 104. Level measurement unit 1
In step 04, the level measurement value of the supplied input signal is supplied to the control unit 107. The control unit 107 compares the preset standard level with the level measurement value, and determines whether or not the level correction is necessary. FIG. 3 shows the outline of the level correction.

In FIG. 3, (a) and (b) show the voltage waveform of the sound signal before the level correction, and (c) show the voltage waveform of the sound signal after the level correction on the time axis. In each case, the measurement point is the output point 111 (1) of the amplifier 102 (1), and the shaded portion in the figure is a preset standard value.
Vpp. (A), the sound input signal level is too high,
In (b), the level of the audio input signal is too low, so that the level is repeated to be within the standard as shown in (c).

If the signal level is within the standard, log data (measurement data and channel, time data, correction data) is supplied to the data output unit 109. The data output unit 109 sequentially stores the log data, sends the recording data to the recording unit 110, and logs out the data. In parallel, after about 10 seconds, the control unit 107 sends an input / output switching signal for input / output switching to the switching control unit 108 in order to measure the sound input signal level of the next channel (channel 2). I do. In the switching control unit 108, the input switching unit 1
03 and an output switching signal to the output switching unit 106 at the same time. In the input switching unit 103 and the output switching unit 106, the designated channel (channel 2) is selected, and the input signal of channel 2 is input to the level measurement unit 1
04, and perform a series of operations for all channels.
Repeat this.

When the control unit 107 determines that the level measurement value is out of the standard, the calculated level correction value is supplied to the level control unit 105. The level control unit 105 supplies the converted level correction signal and reset signal to the output switching unit 106. In the output switching unit 106, the amplification unit 102 corresponding to the channel 1 selected as the initial setting
A level correction signal and a reset signal are supplied to (1). The corresponding amplifying section 102 (1) corrects the instructed level. The level correction value is held until the next setting change. Next, in order to confirm “whether or not the corrected signal is within the standard”, the signal passes through the input switching unit 103 again,
The level measurement unit 104 measures the input signal. Hereinafter, a series of operations are performed for all channels. Repeat this.

As described above, the corresponding channel is selected from the multi-channel signal, the level is measured, the level is corrected based on the result of comparison with an arbitrary standard value, and the level is measured again. However, by storing and recording the log data when it is within the standard, the detection and recording of the gain setting value can be performed automatically without relying on humans.

Although the above-described embodiment of the present invention has been described with respect to an example in which the audio signal level control recording device is installed at the preceding stage of the tape recorder 113, the present invention can be similarly applied to a case where it is used only as an audio signal level monitor. . The configuration is shown in FIG. In the figure, blocks denoted by the same reference numerals as those in the embodiment shown in FIG. 1 are the same as those shown in FIG. The only difference from the embodiment shown in FIG. 1 is that the level control unit 105 and the output switching unit 106 in FIG. 1 are not included, and the other points are the same.

As an application example, by integrating the audio signal level control recording apparatus of the present invention with the tape recorder 113, a general-purpose apparatus can be obtained as a compact and easy-to-operate apparatus. Further, the switching control unit 1 described above
08, the level control unit 105, the level measurement unit 104, the data output unit 109, and the control unit 107 are collectively incorporated into a versatile personal computer, and the functions of the tape recorder 113 and the tape recorder 113 are integrated. The tape recorder 113 can be separated, and the weight of the tape recorder 113 itself can be reduced. Further, the present invention constantly monitors the input / output level and records the level measurement data and the correction data. However, in order to save storage capacity and reduce the operation load, the level measurement and correction data are only output when the level is out of the standard level. The random scan function for recording is also considered as one application.

[0026]

As described above, according to the present invention, the corresponding channel is selected from the multi-channel sound signal input, the sound signal input level is measured, and the measured value is compared with an arbitrarily set standard value. The level correction value is calculated based on the determined result, and the level correction is performed. The sound signal input level is measured again to detect that it is within the standard value, and the log data including the measured value and the level correction value Is recorded, the level control and the detection and recording of the gain set value can be automatically performed without requiring any human intervention.

According to the present invention, a conventional AGC is provided by an audio signal level control recording device provided with the functions of absolute value detection of audio input signal level, level control, input / output switching, information recording, reproduction and system control. The control unit can integrally manage and control the detection and recording of the gain adjustment value that could not be achieved, which makes it possible to calculate the absolute value of the audio signal input level recorded on the magnetic tape, Reduce human error due to manual setting work, etc.
Reliability can be improved. Further, it is possible to significantly reduce costs.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating an internal configuration of an amplification unit, an input switching unit, and an output switching unit illustrated in FIG. 1;

FIG. 3 is a diagram showing an outline of level correction used in the present invention.

FIG. 4 is a block diagram showing another embodiment of the present invention.

FIG. 5 is a block diagram showing an example of level control of a conventional acoustic signal level monitoring device.

[Explanation of symbols]

101, 101 (1 to n) input points, 102, 102 (1
To n) amplifying unit, 103 input switching unit, 104 level measuring unit, 105 level control unit, 106 output switching unit, 107 control unit, 108 switching control unit, 109 data output unit, 110
Recording unit, 111, 111 (1 to n) output points, 112, 1
12 (1 to n) sensors, 113 tape recorders, 21
1 amplifier circuit, 212 level correction value holding circuit

Claims (6)

[Claims] 1. An audio signal level control recording device which monitors an input level when recording a multi-channel audio signal and controls the level of an amplification unit, and selects a corresponding channel from the audio signal input to generate an audio signal. A signal input level is measured, a level correction value is calculated based on a determination result obtained by comparing the measured value with an arbitrarily set standard value, the level is corrected, and the sound signal input level is measured again. Detecting that the measured value is within the standard value, recording log data including the measured value and the level correction value, and switching the channel. 2. The sound signal level control recording method according to claim 1, wherein log data including the measured value and the level correction value is recorded when the value is outside the standard value. 3. The recording method according to claim 1, wherein the log data further includes at least one of a channel and time data. 4. An audio signal level control recording device for monitoring an input level when recording a multi-channel audio signal and controlling a level of an amplification section, wherein a switch for selecting a corresponding channel from the multi-channel audio signal input. A level measurement unit that measures the audio signal input level of the selected channel each time, and a control unit that compares the measured value with an arbitrarily set standard value to determine whether level correction is necessary. A level control unit that calculates a correction value when it is determined that level correction is necessary and performs level correction; and a measurement value when the control unit detects that the level measurement value is within a standard value. And an output unit for recording log data including a level correction value. 5. The audio signal level control recording device according to claim 4, wherein the switching unit further includes an output switching unit for selectively switching the amplification unit. 6. An amplification circuit for controlling a level of an audio signal, wherein the amplification unit holds a previous level correction value even when a new level correction signal is not input to the amplification circuit, and performs the level measurement. 5. A level correction value holding circuit for changing a level correction value by a reset signal supplied through the output switching unit when the value is determined to be out of specification. Sound signal level control recording device.