JPH08220170A - Testing equipment of audio apparatus - Google Patents

Abstract

PURPOSE: To obtain a testing equipment of an audio apparatus which can detect an effect of fluctuation of a supply voltage on an audio signal or an acoustic output with stable accuracy. CONSTITUTION: In testing equipment 11, a plurality of waveform informations stored beforehand in a control device 17 are inputted sequentially to a power circuit 20, a supply voltage fluctuating on the basis of the waveform information is supplied to an audio apparatus 26 and a pop sound generated thereby from the audio apparatus 26 is detected by a pop sound measuring circuit 16. In the case when the pop sound is detected by the pop sound measuring circuit 16, pop sound data are sent to the control device 17, while a voltage value of the detected pop sound is shown in a voltmeter 19 and also sent to the control device 17 and it is stored therein, together with the pop sound data, so that they correspond to each waveform information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a radio receiver and a CD.
The present invention relates to a testing device for audio equipment such as a (compact disc) player, and more particularly to an audio equipment testing device that is preferably implemented in an on-vehicle audio equipment to which a power supply voltage is supplied from a battery.

[0002]

2. Description of the Related Art When designing and developing an automobile audio device, the audio device is supplied with electric power from a single battery together with an electronic device such as a starter in the automobile. It is also necessary to consider the effects on the voltage fluctuations when the engine of the automobile is started and when the load is excessive. Especially in audio equipment, when the supplied power voltage changes,
Since a pop sound “pop” is generated, it is very important to take a measure to investigate what factor causes the pop sound.

In order to test the above-described audio equipment for automobiles, it is necessary to load the audio equipment to be tested into the automobile, which is troublesome.

Japanese Patent Publication No. 44223/1992 discloses a technique relating to a pseudo power supply device capable of outputting a voltage waveform similar to the fluctuation of the power supply voltage of an actual automobile.
In the pseudo power supply device disclosed in the above publication, a plurality of prepared power supply voltages are switched by a switch circuit resembling an engine key for an automobile, thereby artificially outputting a voltage waveform similar to the power supply voltage fluctuation of the automobile.

By using the pseudo power supply device,
It is possible to reproduce a state similar to the state of actually loaded in a car, but the presence or absence of pop sound and the level value must be measured by the person who listens with the ear.

[0006]

When an acoustic device is measured using the above pseudo power supply device, at least one measurer must measure the presence or absence of pop sound and its level value during the measurement. I won't. In addition, there is a problem in terms of accuracy of the measurement result because the measurement result varies due to the difference in the hearing feeling of each measurer. further,
Since the power supply voltage is switched by actually turning the key, the power supply voltage waveform input to the audio device under test changes every time, and the test cannot be performed under the same conditions.

An object of the present invention is to provide a testing apparatus for an audio device, which can detect the influence on the audio signal and the audio output due to the fluctuation of the power supply voltage with stable accuracy.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a power source means for varying a power source voltage corresponding to a plurality of types of waveform patterns stored in advance, and an acoustic output in an audio device when the power source means is used as a power source. Or a test device for audio equipment, comprising: a sound signal before being sonicated, and a detection means for detecting an influence on a sound output or a sound signal due to a change in the power supply voltage of the power supply means. is there. Further, the present invention introduces a power supply unit that changes a power supply voltage corresponding to an input signal, and a sound output in an audio device when the power supply unit is used as a power supply or an audio signal before being sonicated, A determination unit that determines whether or not an audible sound is output from the audio device due to a change in the power supply voltage of the power supply unit, and a plurality of predetermined waveform patterns are stored, and a signal corresponding to each waveform pattern is stored. Is sequentially output to the power supply unit, and a control unit that stores the determination result of the determination unit in association with each of the corresponding waveform patterns is provided. Further, according to the present invention, the control unit is a display unit that displays each determination result stored in association with a waveform pattern, and a desired waveform pattern from a plurality of types of waveform patterns based on the display content of the display unit. And selecting means for selecting, and outputting a signal corresponding to the waveform pattern selected by the selecting means. Further, the present invention is characterized in that the judging means includes a maximum value detecting means for detecting a maximum value of an audio signal or an acoustic output generated in an audio device under the influence of the fluctuation of the power supply voltage, and the control means, together with the judgment result, It is characterized in that the maximum value detected by the maximum value detecting means is stored in association with each corresponding waveform pattern.

[0009]

According to the present invention, the test apparatus for an audio device is provided with a sound output or an audio output of the audio device when the power supply means for varying the power supply voltage corresponding to a plurality of waveform patterns stored in advance is used as the power source. By inputting the voice signal before being converted into the detection means, the influence on the voice signal or the sound output due to the fluctuation of the power supply voltage is detected.

Further, according to the present invention, the audio equipment testing apparatus inputs into the power supply means signals corresponding to a plurality of types of waveform patterns stored in advance in the control means, and supplies the power supply voltage based on the waveform patterns. The audio signal is supplied to an audio device that outputs the audio signal, and the determination unit determines whether or not the audible sound is output from the audio device due to the fluctuation of the power supply voltage according to the waveform pattern. It is stored in the control means in association with each waveform pattern.

Further preferably, the control means includes a display means and a selection means, and displays each waveform pattern and each judgment result stored in association with each waveform pattern on the display means, and displays them. When the selecting means selects a waveform pattern to be tested from the selected waveform patterns, the signal corresponding to the selected waveform pattern is output to the power supply means. Therefore, since the signal corresponding to the waveform pattern selected by the selection means is given to the power supply means, the experiment under the same condition can be repeated.

More preferably, the judging means changes the power supply voltage supplied from the power supply means,
The maximum value detecting unit detects the maximum value of the audio signal or the sound output output from the audio device, and stores the maximum value and the determination result in the control unit in association with the corresponding waveform pattern.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the structure of a test apparatus 11. The test apparatus 11, which is a test apparatus for audio equipment,
Pop sound measurement circuit 16, control device 17, and display device 1
8, a voltmeter 19, and a power supply circuit 20. Pop sound measurement circuit 16, control device 17, and voltmeter 19
And the power supply circuit 20 are respectively GP-IB (General Purpo
se-Interface Bus) interface and is connected by a cable 21. The control signals output from the control device 17 and the measurement signals input to the control device 17 are transmitted via the cable 21. The control device 17 includes a processing circuit 22, a keyboard 23, and a memory 2
4 and are included.

The audio equipment 26, which is the device under test, operates by the power supply voltage supplied from the power supply circuit 20, and the audio signal output from the audio equipment 26 is input to the pop sound measuring circuit 16 via the signal cable. . In the present embodiment, a case will be described in which the audio signal output from the amplifier to the speaker in the audio device 26 is directly input to the pop sound measuring circuit 16 to detect the pop sound.
The sound output, which is the output from the speaker connected to the audio device 26, is transferred to the pop sound measuring circuit 16 via the microphone.
The pop sound may be detected by inputting to.

The pop sound measuring circuit 16 measures the presence or absence of a pop sound in the audio signal or the sound output from the audio device 26 under test, and when the pop sound is detected, the control device 1
Pop sound data, which is a measurement signal indicating that a pop sound is detected, is input to 7. Here, when the pop sound is detected, that is, when the power supply voltage is changed, the audio signal is an audio signal that is in a silent state as an audio output, and is a signal of the audio signal supplied from the amplifier to the speaker in the audio device 26. The voltage has a constant value, for example, −48 dB. The detection of the pop sound is performed by changing the power supply voltage when such an audio output is an audio signal in a silent state and detecting changes in the audio signal and the audio output.

Further, the hop sound measuring circuit 16 gives the voltage value of the generated pop sound to the voltmeter 19. The memory 24 of the control device 17 stores waveform information that is a waveform pattern indicating the fluctuation of the power supply voltage in the vehicle battery, and supplies the waveform signal based on the waveform information to the power supply circuit 20. Further, each measurement signal is displayed on the display device 18 together with the corresponding waveform pattern, and stored in the memory 24 in association with the waveform pattern. Furthermore, by selecting the waveform pattern displayed on the display device 18 with the keyboard 23 which is the selection means in the control device 17, a corresponding waveform signal can be given to the power supply circuit 20.

The voltmeter 19 expresses the voltage of the pop sound detected by the pop sound measuring circuit 16 as a numerical value, and inputs voltage value data as a measurement signal to the control device 17. The power supply circuit 20 supplies a power supply voltage to the audio equipment 26 based on the waveform signal supplied from the control device 17.

When performing a test on the audio equipment 26 by the test apparatus 11, first, the memory 2 of the control apparatus 17 is previously set.
The waveform signal based on the waveform information for simulating the power supply voltage of the automobile battery stored in 4 is input to the power supply circuit 20, and the power supply circuit 20 is used as a pseudo battery device to supply the power supply voltage to the audio equipment 26. . Power circuit 20
When the voltage supplied from the device fluctuates, the acoustic device 2
The pop sound generated from 6 is detected by the pop sound measuring circuit 16, and the voltage value of the pop sound is indicated by the voltmeter 19. Pop sound measuring circuit 16 and voltmeter 19
Each measurement signal output from is transmitted to the control device 17, and is stored in the memory 24 in association with each waveform information.
Each measurement signal input to the control device 17 and the waveform information are displayed on the display device 18 so that the tester can easily recognize the test result.

FIG. 2 is a block diagram showing the configuration of the pop sound measuring circuit 16. The pop sound measuring circuit 16 includes a high pass filter (HPF) 31 and a low pass filter (LP).
F) 32, amplifier circuit 33, rectifier 34, and comparator 3
5, a latch circuit 36, an integrating circuit 37, and a peak hold circuit 38. The high pass filter 31 is a circuit that removes a frequency region lower than a predetermined frequency in the input audio signal. The low-pass filter 32 is a circuit that removes a frequency region higher than a predetermined frequency in the input audio signal. The audio signal output from the audio device 26 is audibly corrected by the high-pass filter 31 and the low-pass filter 32,
Components outside the human audible range are removed.

The rectifier 34 is a circuit that rectifies an input audio signal. The comparator 35 compares the two input signals, and the output becomes high (H) level when the + side input is large, and the output becomes low (L) level when the − side input is large. In the comparator 35, a constant voltage, for example, a voltage of 0.1 V is input as a pop sound presence / absence reference voltage to the-side input. The latch circuit 36 holds the input output of the comparator 35 and outputs it to the control device 17.

A reset signal, which is a control signal, is input from the control device 17 to the reset (R) input of the latch circuit 36. The audio signal rectified by the rectifier 34 is input to the integrating circuit 37, performs integration over a certain period, and outputs the integrated signal to the peak hold circuit 38. The peak hold circuit 38 holds the peak level of the input from the integration circuit 37, outputs it to the voltmeter 19, and releases the held peak level by the release signal from the control device 17.

The voice signal input to the pop sound measuring circuit 16 is processed by the high pass filter 31 and the low pass filter 3.
The auditory sense is corrected by 2. The auditory-corrected audio signal is gain-adjusted by the amplifier circuit 33, and the rectifier 34
Is input to and rectified. Whether or not the rectified audio signal contains a pop sound is determined by comparing with a pop sound presence / absence determination voltage in the comparator 35, and when the pop sound is measured, an H level signal is output to the latch circuit 36. It The latch circuit 36 holds the H level from the comparator 35 and outputs it to the control device 17. Controller 17
Stores the output in a predetermined area of the memory 24, and after storing, outputs a reset signal which is a control signal to reset the latch circuit 36. Further, the audio signal rectified by the rectifier 34 is input to the integrating circuit 37, and the integrating circuit 37
Is shaped and input to the peak hold circuit 38, and the peak voltage value held by the peak hold circuit 38 is read by the voltmeter 19. The peak hold circuit 38 releases the peak voltage value held by the release signal which is a control signal provided from the control device 17.

FIG. 3 shows the control device 1 in the test apparatus 11.
7 is a flowchart showing a process performed in 7. In step s1, the user selects one from the waveform patterns showing the battery fluctuation waveform for the vehicle, which is stored in advance in the control device 17. In subsequent step s2, a waveform signal based on the waveform pattern is transmitted to the power supply circuit 20 via the cable 21. The power supply circuit 20 supplies a power supply voltage whose voltage level varies according to the input waveform signal to the audio equipment 26.

In step s3, it is determined whether or not a pop sound is present in the audio signal output by supplying the power supply voltage to the audio device 26. If a pop sound is detected, the control device 17 is activated. The pop sound data indicating that the pop sound is detected is transmitted to step S4, and the process proceeds to step s4. In step s4, the voltage value of the detected pop sound is measured and displayed on the voltmeter 19, and the voltage value data is sent from the voltmeter 19 to the control device 17. In step s5, the control device 17 stores the pop sound data and the voltage value data in the memory 24 of the control device 17 in association with the waveform pattern.

Since the processing relating to the selected waveform pattern is completed, the process proceeds to step s6. In step s6, it is determined whether or not the test is completed for all the waveform patterns stored in the control device 17. If all waveform patterns have been tested, step s
Proceed to 7. In step s7, the waveform pattern in which the pop sound is detected and the voltage value of the detected pop sound are displayed on the display device 18. In the subsequent step s8,
One or a plurality of pieces of waveform information are selected from the waveform information displayed on the display device 18, and another test is performed to determine whether or not to reproduce. When reproducing, it progresses to step s9. In step s9, a waveform pattern for reproducing the test result is selected by the keyboard 23 and set in the controller 17.

If no pop sound is detected in step s3, the process proceeds to step s6 and the subsequent processing is performed. Further, in step s6, if the tests for all the waveform patterns stored in the memory 24 of the control device 17 have not been completed, the process returns to step s1,
The processing from step s1 is performed again. When the test result is not reproduced in step s8, the process performed by the control device 17 ends.

As described above, according to the present embodiment, since the pop sound generated in the acoustic device 26 as the device under test is electrically detected by the pop sound measuring circuit 16, the pop sound is always popped with stable accuracy. Sound can be measured. In addition, the time required for the test can be shortened as compared with the case where the tester listens by ear and performs the measurement.

Since the power supply voltage to be supplied to the audio equipment 26 is selected from the power supply voltage waveform patterns stored in advance in the control device 17 and supplied from the power supply circuit 20, the same waveform pattern is selected. Thus, the power supply voltage having the same waveform can be repeatedly output, and the test under the same condition can be repeated. Further, when a pop sound is generated by the supplied power supply voltage, it is detected by the pop sound measuring circuit 16, and the voltage value of the pop sound is measured by the voltmeter 19. Since the pop sound data and the voltage value data are transmitted to the control device 17 and stored in association with each waveform information, the presence or absence of the pop sound and the voltage value in the presence of the pop sound are associated with the waveform information. Can be referred to.

Furthermore, since the pop sound data, the voltage value data, and the waveform information are displayed on the display device 18 in association with each other, the test results can be easily compared and the ranking for each condition can be accurately performed. You can Furthermore, the display device 1
Since the corresponding waveform signal is given to the power supply circuit 20 by selecting the waveform information displayed on the keyboard 8 using the keyboard 23, the operability is good and the test can be easily performed under the same conditions, and the pop sound is generated. It is possible to pursue the factors that cause. Furthermore, the test can be automatically performed by inputting the waveform pattern to be tested and the number of times of repeating the test to the control device 17, and the test result is stored in the control device 17, so that the tester can There is no need to perform measurement, which saves labor and improves convenience.

[0030]

As described above, according to the present invention, it is possible to detect the influence on the audio signal and the audio output outputted from the audio equipment, which is caused by the fluctuation of the power supply voltage supplied from the power supply means based on the waveform pattern. Since the detection is performed by the means, the same power supply voltage waveform can be repeatedly output by selecting the same waveform pattern, and the test under the same condition can be repeated. Further, the influence on the voice signal and the sound output is detected by the detecting means, so that the influence on the voice signal and the sound output can always be detected with stable accuracy.

Further, according to the present invention, the judging means judges whether or not the audible sound is output from the audio equipment by the fluctuation of the power supply voltage supplied from the power supply means based on the waveform pattern. Since it is stored in the control means in association with the waveform pattern, it is possible to repeatedly output the power supply voltage of the same waveform by selecting the same waveform pattern, and to repeat the test under the same condition.
Further, since it is determined by the determining means whether or not the audible sound is output, it is possible to always determine whether or not the audible sound is output with stable accuracy. Furthermore, since each waveform pattern and the determination result indicating the presence or absence of audible sound are stored in the control means in association with each other, the presence or absence of audible sound can be referred to in association with the waveform pattern.

Further, according to the present invention, since each waveform pattern and the determination result corresponding to each waveform pattern are displayed on the display means, the determination result for each waveform pattern can be easily confirmed. Further, by selecting each displayed waveform pattern by the selection means, the signal corresponding to the selected waveform pattern is given to the power supply means, so that the test under the same conditions can be repeated,
Operability is improved.

Furthermore, according to the present invention, the maximum value of the audio signal or the acoustic output output from the audio equipment is detected by the maximum value detecting means by the fluctuation of the power supply voltage supplied from the power supply means. The maximum value of the audio signal or the sound output can always be detected stably. Further, the maximum value is stored together with the determination result of determining the presence or absence of the audible sound in association with the waveform pattern and displayed on the display unit, so that the maximum value of the audio signal or the acoustic output in each waveform pattern can be easily compared. It can be carried out.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a test apparatus 11.

FIG. 2 is a block diagram showing a configuration of a pop sound measuring circuit 16.

FIG. 3 is a flowchart showing a process performed by control means 17.

[Explanation of symbols]

 11 Test Device 16 Pop Sound Measuring Circuit 17 Control Device 18 Display Device 19 Voltmeter 20 Power Supply Circuit 21 Cable 22 Processing Circuit 23 Keyboard 24 Memory 26 Acoustic Equipment

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihisa Igawa 1-2-2 Goshodori, Hyogo-ku, Kobe-shi, Hyogo Within Fujitsu Ten Limited

Claims (4)

[Claims] 1. A power supply unit for varying a power supply voltage corresponding to a plurality of types of waveform patterns stored in advance, and a sound output in an audio device when the power supply unit is used as a power supply or a voice before being sonicated. A testing device for an audio device, comprising: a detection unit that receives a signal and detects an influence on a sound output or a sound signal due to a change in the power supply voltage of the power supply unit. 2. A power supply means for varying a power supply voltage in response to an input signal, and a sound output in an audio device when the power supply means is used as a power supply or an audio signal before being sonicated, A determination unit that determines whether or not an audible sound is output from the audio device due to a change in the power supply voltage of the power supply unit, and a plurality of predetermined waveform patterns are stored, and a signal corresponding to each waveform pattern is stored. Is sequentially output to the power supply unit, and a control unit that stores the determination result of the determination unit in association with each of the corresponding waveform patterns is provided. 3. The display means for displaying each determination result stored in association with a waveform pattern, and a desired waveform pattern from a plurality of types of waveform patterns based on the display content of the display means. 3. The test apparatus for audio equipment according to claim 2, further comprising: a selecting unit that selects a signal corresponding to the waveform pattern selected by the selecting unit. 4. The determination means includes maximum value detection means for detecting a maximum value of a voice signal or an acoustic output generated in an audio device under the influence of the fluctuation of the power supply voltage, and the control means includes the determination result and the maximum value. The test apparatus for audio equipment according to claim 2, wherein the maximum value detected by the maximum value detection means is stored in association with each corresponding waveform pattern.