JPH11285100A - Acoustic diagnostic equipment - Google Patents

Abstract

(57) [Summary] [Problem] To provide an acoustic diagnostic apparatus that can more easily and surely diagnose an acoustic system having a plurality of speakers. Kind Code: A1 A test sound output from a test sound generating means is supplied to a plurality of speakers SPK1 to SPK8 sequentially and individually, and test sounds emitted from the speakers SPK1 to SPK8 are collected and detected by a microphone MIC. And a detection signal S2 obtained by the detection.
2. By comparing S23 with a preset reference value, it is possible to realize an acoustic diagnostic apparatus capable of easily and reliably determining the quality of each of the speakers SPK1 to SPK8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order.

BACKGROUND OF THE INVENTION Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (FIGS. 1 to 3) Effects of the Invention

[0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic diagnostic apparatus, and is suitably applied to, for example, an acoustic diagnostic apparatus for diagnosing an acoustic apparatus in a movie theater.

[0004]

2. Description of the Related Art Conventionally, for example, in a theater for showing a movie, a plurality of speakers corresponding to a plurality of channels are provided, and when an image of a movie film is projected and reproduced by a projection device, a part of the projection device or An audio signal recorded on the movie film is reproduced from an audio reproducing unit provided in the projection device, and the reproduced signal is output from a speaker of each channel.

In such a movie sound reproduction system, as a method of diagnosing the sound reproduction output state of each channel, for example, an operator switches each channel while reproducing the sound of the movie film to correspond to each channel. The user himself / herself listens to the sound output from the loudspeaker and subjectively determines the output state of the reproduced sound.

[0006]

However, in the acoustic diagnostic method for judging the quality of a sound reproducing system by such a method, a large error occurs in the diagnostic result due to the individual difference of the operator to be diagnosed, or each channel has a problem. Each time the operator judges the output sound, there is a problem that the troublesome time and effort can not be avoided.

The present invention has been made in view of the above points, and it is an object of the present invention to propose an acoustic diagnostic apparatus which can more easily and surely diagnose an acoustic system having a plurality of speakers.

[0008]

According to the present invention, a test sound output from a test sound generating means is supplied to a plurality of speakers sequentially and individually, and a test sound emitted from each speaker is sequentially output. By collecting and detecting with a microphone and comparing a detection signal obtained by the detection with a preset reference value, the quality of each speaker can be easily and reliably determined.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a sound system of a movie theater as a whole, and a digital audio reproducing device 11 attached to a projection device (not shown) for reproducing an image recorded on the movie film is recorded on the movie film. The reproduced digital audio signal S11 for eight channels is supplied to the switching input terminal of the switching unit 12.

The switching section 12 has a plurality of input terminals. In addition to the digital audio signal S11 supplied from the digital audio reproducing apparatus 11, an analog audio signal S12 recorded on a movie film, an external input audio signal S13, S14
And the external microphone input signal S15 can be input to the corresponding switching input terminals.

The switching unit 12 switches the switching input terminal based on a control signal CONT 20 supplied from a system controller 20 for controlling the entire sound system 10, thereby selecting the digital audio signal S 11 supplied from the digital audio reproducing device 11. When input, this is supplied to the signal processing unit 13.

The signal processing section 13 has a digital audio signal S
After performing audio signal processing (graphic equalizer, filter, level adjustment, etc.) in accordance with the acoustic characteristics of the movie theater where the audio system 10 is installed, the audio signal is further transmitted to the movie theater. Performs signal processing according to the number of speakers installed in the. That is, when the number of channels of the digital audio signal S11 output from the digital audio reproduction device 11 is eight, and when the number of speakers installed in the movie theater is, for example, seven, the signal processing unit 13 outputs one channel. Is mixed with one of the other seven-channel audio signals and output.

In this embodiment, the number of speakers installed in the movie theater is equivalent to eight channels, and the signal processing unit 13 performs a process of changing the number of channels on the input eight-channel audio signal. Print this without doing it.

The signal processing unit 13 inputs the audio signal S13 subjected to the audio signal processing to a first switching input terminal of the switching unit 15. The switching unit 15 is a system controller 20
When the audio signal S13 is selected by the above control, the audio signal S13 is supplied to the subsequent switching selection unit 16.

Upon input of the audio signals S13 for eight channels supplied from the signal processing unit 13 via the switching unit 15, the switching selection unit 16 supplies the audio signals S13 to output terminals corresponding to the respective channels. Are supplied to the speakers SPK1 to SPK8 provided corresponding to the respective channels via the amplifier circuits 17 provided for the respective channels.

Thus, the digital audio reproducing device 11
The digital audio signal S11 for eight channels reproduced from the movie film in the above-mentioned manner corresponds to the corresponding speaker SPK.
1 to SPK8 are output as audio.

In the case of this embodiment, as shown in FIG. 2, a first speaker SPK1 on the left side (L) when viewed from the seat near a screen SC provided in front of a movie theater;
Center left (LC) second speaker SPK2, center (C) third speaker SPK3, center right (RC)
A fourth speaker SPK4, a right (R) fifth speaker SPK5, a sixth speaker SPK6 made of a sub-hood (SW), and a seventh speaker SP7 for the left surround behind the passenger seat.
And an eighth speaker SPK8 for right surround. Each speaker SPK1-SPK
Reference numeral 8 denotes a high-range speaker unit and a low-range speaker unit.

Here, the acoustic system 10 has a pink noise generator 14, and a pink noise signal S14 generated in the pink noise generator 14 is input to a second switching input terminal of the switching unit 15. ing. The pink noise is a signal having a constant sound pressure in each frequency band, and is used for diagnosing whether sound can be reliably output from each of the speakers SPK1 to SPK8 installed in the movie theater. .

Accordingly, when the switching unit 15 is switched to the second switching input terminal side under the control of the system controller 20, the pink noise signal S14 is supplied to the switching selecting unit 16 via the switching unit 15. At this time, the operator operates the input unit 19 to activate the speaker SPK.
When any one of 1 to SPK8 is selected, the input unit 19 supplies a selection signal S19 to the system controller 20 in accordance with the selection of the operator, and the system controller 20 controls the switching selection unit 16 in response to the selection signal S19. As a result, the pink noise signal S14 is supplied to the speaker selected by the operator.

When pink noise is emitted from the speaker to which the pink noise signal S14 has been supplied, the pink noise is collected by a microphone MIC installed substantially at the center of the customer seat (FIG. 2), and a band-pass filter is provided. (Bandpass filter) 21 separates the signal into a high-frequency component signal S21H and a low-frequency component signal S21L. As a result, the high frequency component of the pink noise emitted from the high frequency speaker units of the speakers SPK1 to SPK8 is extracted as the high frequency component signal S21H, and each of the speakers SPK1 to SPK8.
The low-frequency component of pink noise emitted from the low-frequency speaker unit of .about.SPK8 is extracted as a low-frequency component signal S21L.

The high-frequency component signal S thus extracted
The signal levels of 21H and the low-frequency component signal S21L are detected by the level detectors 22 and 23, respectively, and are supplied to the subsequent determination unit 24 as the high-frequency level detection signal S22 and the low-frequency level detection signal S23.

The judgment section 24 outputs the high-frequency level detection signal S22
Then, the measured signal level of the high frequency component and the measured signal level of the low frequency component of the pink noise represented by the low frequency level detection signal S23 are compared with a preset reference value and an allowable range of the reference value, respectively. Then, it is determined whether or not the measured value in the high frequency range and the measured value in the low frequency range fall within the allowable range of the reference value.

For example, when the preset reference value and its allowable range are −20 [dB] ± 6 [dB], the measurement level of the high frequency band is −21 [dB], and the measurement frequency of the low frequency band is −21 [dB]. Assuming that the level is −18 [dB], since both the high frequency range and the low frequency range fall within the allowable range of the reference value, the determination unit 24 determines, for the speaker emitting pink noise measured at this time, A display signal S24 indicating normal operation is sent to a display unit 25 constituted by a liquid crystal display device. Display unit 25
Receives the speaker number to be measured from the system controller 20 at this time, and displays the speaker number and the measurement result (normal) at this time.

On the other hand, for example, when the measurement level of the high band is −21 [dB] and the measurement level of the low band is −30 [dB], the low band falls outside the allowable range of the reference value. As a result, the determination unit 24 outputs the display signal S indicating that there is an abnormality in the speaker that has emitted the pink noise measured at this time.
24 to the display unit 25. Thereby, the display unit 25
Displays the number of the speaker to be measured and the measurement result (abnormal) at this time.

When diagnosing each speaker in the acoustic system 10 having such a configuration, the system controller 20
(FIG. 1) executes the acoustic diagnosis processing procedure shown in FIG. That is, in the movie theater, for example, every morning, when the operator specifies the acoustic diagnosis processing by operating the input unit 19, the system controller 20 sets the step SP in FIG.
From 0, the sound diagnostic processing procedure is entered, and it is determined in step SP1 whether a reference value (including an allowable range) has already been set.

The reference value can be set in advance in a memory (not shown) provided in the judgment section 24. If a negative result is obtained in step SP1, this means that the reference value has not been set. At this time, the system controller 20 displays on the display unit 25 that the reference value has not been set, and proceeds to step SP7 to confirm that the setting method of the reference value is designated by the operator. Await.

When the operator inputs a command for inputting a reference value and a permissible range using a computer or the like at the input unit 19, the system controller 20 proceeds to step SP8, and sets the reference value and the permissible range input by the operator in a memory. Then, the process returns to step SP1 described above.

On the other hand, when the operator specifies the setting of the reference value by measurement, the system controller 20 proceeds to step SP9, and starts the measurement for setting the reference value. In this measurement, the system controller 20
Supplies a pink noise signal sequentially to each of the speakers SPK1 to SPK8 (FIGS. 1 and 2), and
A pink noise sound is generated individually sequentially from K8.

Then, a pink noise sound emitted from each of the speakers SPK1 to SPK8 is input to the determination unit 24 via the microphone MIC, the band-pass filter 21, and the level detection units 22 and 23, and is obtained for each of the speakers SPK1 to SPK8. The measured value of the high frequency and the measured value of the low frequency are stored in a memory (not shown) of the determination unit 24 together with the speaker number as a reference value for the high frequency and a reference value for the low frequency, respectively. This reference value is set as an invariable value in the subsequent diagnosis.

Incidentally, when the reference value is measured, the operator can operate the input unit 19 again to measure the abnormal speaker while listening to the pink noise sound actually emitted from the speaker. In the measurement, eight speakers SPK1 were used.
Among the measurement results of SPK8 to SPK8, the system controller 20 determines that a speaker having a particularly small measurement level is abnormal and displays it on the display unit 25. Therefore, by confirming the display, the operator can take measures such as re-measurement of the abnormal speaker or repair of the speaker.

Thus, at step SP9 in FIG. 3, the measurement of each of the speakers SPK1 to SPK8 is performed, and at the following step SP10, each measured value at step SP9 is stored in the memory of the judgment section 24 as a reference value. At this time, the system controller 20 stores the permissible range in the memory together with the reference value, and in a subsequent measurement, the determination unit 24 determines the quality of the measurement result using the reference value and the permissible range.

When the processing in step SP10 is completed, the system controller 20 executes the above-mentioned step SP1.
The process returns to step SP2 to obtain a positive result, and proceeds to step SP2. Step SP2 to step SP4 are for each speaker SP
In step SP2, the system controller 20 first supplies a pink noise signal to the first speaker SPK1 to generate pink noise from the speaker SPK1.

Then, the pink noise sound emitted from the speaker SPK1 is collected by the microphone MIC, and in step SP3, the high frequency measurement value and the low frequency measurement value are compared with the reference value and the allowable range. When the comparison result is within the allowable range, the determination unit 24 obtains an affirmative result in step SP4, and then proceeds to step SP6.
Is displayed on the display unit 25 together with the speaker number. On the other hand, when the measurement result is out of the allowable range, the determination section 24 proceeds from step SP4 to step SP5, and displays on the display section 25 that there is an abnormality together with the speaker number.

When the measurement of the first speaker SPK1 is completed, the system controller 20 returns from step SP11 to the above-mentioned step SP2, and repeats the same measurement, comparison and judgment processing for the second speaker SPK2. When the measurement and comparison determination processing are sequentially repeated from the first speaker SPK1 to the eighth speaker SPK8 in this manner, the system controller 20 moves from step SP11 to step SP12 and ends the acoustic diagnosis processing procedure.

Thus, the normal or abnormal state of each speaker is displayed on the display unit 25 by the acoustic diagnosis processing procedure, so that the operator can easily find the abnormal speaker by checking the display. .

In the above configuration, the sound system 10
Transmits a pink noise signal from the pink noise generator 14 to each of the speakers SPK1 to SPK8 at the time of acoustic diagnosis for measuring and determining the quality of each of the speakers SPK1 to SPK8.
K8, and individually supplied to each speaker SPK1-SPK.
8 is individually judged. At this time, the pink noise signal S14 (FIG. 1) is
It is switched to PK1 to SPK8 and supplied to the corresponding speaker via the amplifier circuit 17.

Accordingly, the pink noise signal is supplied to the amplifying circuit 17 and the respective speakers SPK1 to SPK8 after the switching selector 16 at the time of the acoustic diagnosis, and the acoustic diagnostic processing procedure described above with reference to FIG. 3 is executed. Thereby, the presence or absence of an abnormality in the amplifier circuit 17 and each of the speakers SPK1 to SPK8 is diagnosed.

Therefore, the diagnosis target is further reconstructed by the reproduction output system (amplifying circuit 17 and each speaker S), based on whether the entire sound system 10 including the digital sound reproduction device 11 is abnormal or not.
PK1 to SPK8) are performed. As the reference value used at this time is a fixed value that is set in advance, the deterioration due to aging of each of the speakers SPK1 to SPK8 is reliably detected.

Incidentally, the diagnosis of the digital audio reproducing apparatus 11 is made by judging whether or not the digital audio recorded on the movie film is correctly reproduced when the movie film is mounted on the projector and the test projection is performed. be able to.

Thus, according to the above configuration, the diagnosis of the audio output system can be easily performed only by a simple operation in which the operator operates the input unit 19 and starts executing the acoustic diagnosis processing procedure. At this time, the presence or absence of an abnormality can be diagnosed based on the result of actually measuring the pink noise (measured numerical value) and the invariable reference value. , Can perform universal acoustic diagnosis.

In the above-described embodiment, a case has been described in which a pink noise signal is applied to each of the speakers SPK1 to SPK8 when acoustic diagnosis is performed. However, the present invention is not limited to this. White noise having the same amplitude in each frequency band may be given. In this case, the level may be adjusted for each band in consideration of the fact that the sound pressure increases as the frequency increases. Further, various other test sounds may be used instead of the pink noise.

In the above-described embodiment, a case has been described in which a signal obtained by collecting sound with the microphone MIC is supplied to the band-pass filter 21 to separate a high-frequency component and a low-frequency component. The present invention is not limited to this, but the signals supplied to the respective speakers SPK1 to SPK8 are band-limited by a band-pass filter so that the signals of each band (high-frequency component and low-frequency component) can be
You may make it supply to PK1-SPK8. In this case, a high-frequency component of a pink noise signal is given to each of the speakers SPK1 to SPK8 and collected by the microphone MIC to diagnose the high-frequency unit of the speakers, and each of the speakers SPK1 to SPK8. , A low-frequency component of the pink noise signal is given to each of the microphones, and the low-frequency components are collected by the microphone MIC, whereby a low-frequency unit of the speaker can be diagnosed.

In the above-described embodiment, the case where the reference value and the allowable range are set for each of the speakers SPK1 to SPK8 has been described. However, the present invention is not limited to this, and one reference value and the allowable range are set. Each speaker SPK
1 to SPK8.

In the above embodiment, the case where the band-pass filter 21 for extracting the high-frequency component and the low-frequency component corresponding to the unit (the high-frequency unit and the low-frequency unit) of the speakers SPK1 to SPK8 is used. As described above, the present invention is not limited to this. For example, each speaker SPK1
If the SPK8 is composed of a high-band unit, a mid-band unit and a low-band unit, a filter that extracts high-band components, mid-band components and low-band components is used as the band-pass filter 21 accordingly. What should I do?

In the above-described embodiment, a case has been described where the pink noise signal generated by the pink noise generator 14 is supplied to each of the speakers SPK1 to SPK8 to perform acoustic diagnosis. However, the present invention is not limited to this. Instead, for example, a pink noise signal may be recorded on a digital audio track of a movie film, and the pink noise signal may be supplied to each of the speakers SPK1 to SPK8 by reproducing the movie film.

In the above-described embodiment, the case of diagnosing an acoustic system that outputs eight channels of sound has been described. However, the number of channels is not limited to this, and the present invention is applied to apparatuses having various numbers of channels. can do.

In the above-described embodiment, a case has been described in which the diagnosis result is displayed on the liquid crystal display device (display device 25). However, the display method is not limited to this. Various methods can be used, such as a method of turning on a light of a color corresponding to the color, a method of displaying the presence or absence of an abnormality by sound, in addition to a visible display.

In the above embodiment, each speaker SPK1 is controlled by the system controller 20.
-SPK8 is sequentially and automatically supplied with a pink noise signal, and the quality is sequentially determined. However, the present invention is not limited to this, and the operator operates the speaker designation switch provided on the input unit 19 while sequentially Sequentially each speaker SP
A pink noise signal may be supplied to K1 to SPK8 to determine pass / fail.

In the above-described embodiment, the case where sound diagnosis is performed in a movie theater has been described. However, the present invention is not limited to this case. It can be widely applied when diagnosing a speaker system.

[0051]

As described above, according to the present invention, the test sound output from the test sound generating means is sequentially and individually supplied to a plurality of speakers, and the test sounds sequentially emitted from each speaker are collected by the microphone. By comparing the detection signal obtained by the detection with a preset reference value, it is possible to realize an acoustic diagnostic apparatus capable of easily and reliably determining the quality of each speaker.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an acoustic system using an acoustic diagnostic apparatus according to the present invention.

FIG. 2 is a schematic diagram illustrating an example of speaker arrangement in a theater.

FIG. 3 is a flowchart showing an acoustic diagnostic processing procedure according to the present invention.

[Explanation of symbols]

Reference numeral 10: Sound system, 11: Digital sound reproducing device, 14: Pink noise generator, 16: Switching selection unit, 17: Amplifier circuit, 21: Band-pass filter, 22, 23: Level detection Section, 24 ... decision section, 2
5 Display unit, SPK1 to SPK8 Speaker, MI
C: Microphone.

Claims (4)

[Claims] 1. A test sound generating means for generating a predetermined test sound signal; an output means for sequentially and individually supplying the test sound signals output from the test sound generating means to a plurality of speakers; A test sound individually emitted from each of the speakers is detected via a microphone when a signal is supplied, and the quality of each speaker is determined by comparing the detected test sound level with a preset reference value. An acoustic diagnostic apparatus comprising: determining means for determining. 2. The acoustic diagnostic apparatus according to claim 1, wherein the plurality of speakers are a speaker system installed in a movie theater. 3. The determination means separates the test sound detected through the microphone into frequency band components corresponding to audio output units for each frequency band of each of the speakers. 2. The apparatus according to claim 1, further comprising a band-pass filter that supplies a test sound level for each frequency band to the determination unit, wherein the determination unit determines pass / fail of each speaker for each of the frequency bands. Acoustic diagnostic apparatus according to item 1. 4. The acoustic diagnostic apparatus according to claim 1, wherein the test sound signal is a sound signal having a constant sound pressure regardless of a band.