JPH10111693A - Recording medium for acoustic characteristic measurement, acoustic characteristic measurement device, and method of measuring acoustic characteristic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to accurately measure acoustic characteristic and equipment characteristic within a short time by providing an audio area in which characteristic signal is recorded and a program area in which a measurement program for performing measurement by using the characteristic signal. SOLUTION: En-CD (compact disc), which is recording medium for acoustic characteristic measurement, is provided with an audio area where a characteristic signal is recorded and a program area where a measurement program for a measurement by using the characteristic signal is recorded. En-CD drive 2 outputs a control program from the program area of En-CD, and a personal computer 3 displays a menu on a screen. And, for example, when all higher harmonics distortion factor measurement by a sine wave is selected, the personal computer 3 loads the control program of personal computer 3 from the program area of En-CD, and En-CD drive 2 outputs a sign wave from the audio area of En-CD to audio amplifier 101 which is a measurement object 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal for measuring acoustic characteristics such as sine waves and white noise, a signal for measuring device characteristics for measuring characteristics of audio equipment (hereinafter referred to as a "characteristic signal"), and a measurement corresponding to the characteristic signal. Characteristic measurement for the purpose of measuring acoustic characteristics and device characteristics (hereinafter referred to as characteristics) in a short period of time and with high accuracy using a recording medium for measuring acoustic characteristics in which a control program for performing the measurement is recorded. The present invention relates to a recording medium, an acoustic characteristic measuring device, and an acoustic characteristic measuring method.

[0002]

2. Description of the Related Art FIG.
5 and FIG. FIG. 15 is a configuration diagram of a conventional measurement system for measuring the reproduction characteristics of a CD (compact disk) player. CD to be the measurement target unit 200
The player 201 reproduces a CD (hereinafter referred to as a test CD) 202 on which the characteristic signal is recorded.

The characteristic signal of the test CD 202 is CD
The data is reproduced by the player 201 and converted into an analog signal by a built-in digital / analog converter (hereinafter, referred to as a D / A converter). This signal has an output different from the characteristic signal recorded on the test CD 202 due to the performance of the D / A converter. By measuring the analog signal output, the performance of the CD player 201 can be known.
An analog signal output from the CD player 201 is converted into a digital signal by an analog-to-digital converter (hereinafter, referred to as an A / D converter), and then input to the personal computer 302, where the personal computer 302
Is analyzed by the acoustic characteristic measurement program.

FIG. 16 is a configuration diagram of a conventional measurement system for measuring the frequency characteristics of the radiated sound output from a speaker. The measurement target unit 200 is a CD player 201, an audio amplifier 203, a speaker 204, and a microphone 205. The signal reproduced by the CD player 201 is amplified by the audio amplifier 203, input to the speaker 204, and output from the speaker 204 as radiated sound. For this output, a sine wave having a frequency of, for example, 1 kHz is output from only the L channel, only the R channel, or both LR channels, and is input to the microphone 205.

The output of the microphone 205 is supplied to the A / D converter 30
1 is converted to a digital signal. This output is analyzed by the acoustic characteristic measurement program of the personal computer 302. At this time, the characteristics of the CD player alone have been measured in advance by the measurement system described in FIG. The audio amplifier 203 and the microphone 205
If the characteristics of the speaker 204 and the speaker system are measured in advance, the characteristics of the speaker 204 and the speaker system can be measured from the measured values of the characteristics of these devices and the input to the personal computer 302.

Next, a general method for measuring acoustic characteristics according to the prior art will be described. For example, to measure frequency characteristics,
A frequency sweep signal is used as the characteristic signal. The frequency sweep signal is a signal recorded by changing the frequency of a sine wave having a constant amplitude from a low frequency to a high frequency.

[0007] The frequency sweep signal is input to the measurement target section. A frequency sweep signal before being input to the measurement target unit and a frequency sweep signal output from the measurement target unit are measured. Then, both the input and output frequency sweep signals are processed to calculate the frequency spectrum, the value obtained by dividing the output frequency spectrum by the input frequency spectrum is displayed in decibels, the horizontal axis is frequency, and the vertical axis is decibels. It is displayed on the display unit as the expressed frequency characteristics.

In the measurement of the total harmonic distortion, a sine wave is used as a characteristic signal. The sine wave is input to the measurement target. The sine wave output from the measurement target section is distorted by a signal processing circuit or the like of the measurement target section, and has a fundamental component and a harmonic component of the sine wave.
The frequency spectrum of the harmonic component of the sine wave is measured, and the frequency spectrum is subjected to arithmetic processing to determine the total harmonic distortion factor.

[0009]

In the conventional personal computer, it was difficult to perform the arithmetic processing of the frequency spectrum of the signal. Conventional frequency spectrum calculation techniques include frequency spectrum analysis (hereinafter FF) by fast Fourier transform.
It is called T analysis. ), Frequency detection using a counter, frequency detection using a bandpass filter, or frequency detection using a combination of frequency detection using a counter and a bandpass filter.

In the FFT analysis, a frequency spectrum distribution is obtained, and the center frequency of the input signal can be specified. However, the FFT analysis by a personal computer has a drawback that it takes a long time to perform an arithmetic process and that it is difficult to detect a low frequency band, so that a spectrum cannot be calculated in a short time, so that real-time frequency spectrum measurement is difficult.

The frequency detection by the counter is to count the number of times that the amplitude value of the sine wave input in time series has changed from minus to plus in one second, and then to specify the frequency. Is what you do. For example, if the frequency changes from minus to plus 50 times per second, the frequency can be specified as 50 Hz. However, when measuring a frequency of, for example, 0.1 Hz, this method has a drawback that it is difficult to specify a low-frequency in a short time, as it takes 10 seconds or more, and it is difficult to specify a real-time frequency.

In the frequency detection by the band-pass filter, the input signal is passed through the band-pass filter, and the center frequency of the band-pass filter is shifted from the low frequency to the high frequency (or from the high frequency to the low frequency). Let
The frequency at which the output from the bandpass filter becomes maximum is determined as the frequency of the input signal. However, when the center frequency of the bandpass filter is moved on a computer, there is a drawback that it takes time and real-time processing is difficult.

Further, in the detection in which the detection by the counter and the detection by the band-pass filter are combined, an approximate frequency is specified by the detection by the counter, and the exact frequency is obtained by the detection by the band-pass filter. However, real-time processing is difficult as in the method described above. As described above, the conventional acoustic characteristic measuring system has a drawback that it takes a long time to perform the measurement and cannot perform real-time processing.

[0014]

According to a first aspect of the present invention, there is provided a recording medium for measuring acoustic characteristics, comprising: an audio area in which a characteristic signal is recorded; And a program area in which a measurement program for performing the measurement is recorded.

According to a second aspect of the present invention, in the recording medium for measuring acoustic characteristics, an audio area in which characteristic signals are recorded, and a measurement program for performing measurement using the characteristic signals are recorded. And a measurement program for comparing the characteristic signal input to the measurement target unit with the signal output from the measurement target unit after passing through the measurement target unit is recorded in the program region. It is characterized by.

According to a third aspect of the present invention, in the recording medium for measuring acoustic characteristics according to the first or second aspect,
The measurement program and the characteristic signal are recorded on different tracks.

According to a fourth aspect of the present invention, in the recording medium for measuring acoustic characteristics according to the first or second aspect,
The characteristic signal is recorded on a track or an index different from a track or an index on which the measurement program is recorded.

According to a fifth aspect of the present invention, in the recording medium for measuring acoustic characteristics according to the first or second aspect,
The characteristic signal is recorded in a session different from the session in which the measurement program is recorded.

According to a sixth aspect of the present invention, there is provided the recording medium for measuring acoustic characteristics according to the first to fifth aspects, wherein:
The characteristic signal and various item data of the measurement program are recorded as audio data in the audio area.

According to a seventh aspect of the present invention, in the recording medium for measuring acoustic characteristics according to the first to sixth aspects,
A synchronization signal is added to the characteristic signal.

According to a further aspect of the present invention, there is provided an audio characteristic measuring apparatus comprising: an audio area in which a characteristic signal is recorded; and a program area in which a measuring program for performing measurement using the characteristic signal is recorded. A reading unit that reads the characteristic signal or the measurement program from a recording medium, a display unit that displays the measurement content of the characteristic based on the measurement program read from the reading unit, and the display unit that is displayed on the display unit. A selection input unit for selecting measurement content; and a control unit to which the readout unit, the display unit, and the selection input unit are respectively connected, and the control unit reads the measurement program from the readout unit. Reading a characteristic signal from the reading unit based on the measurement program, inputting the characteristic signal to the measurement target unit, and outputting a signal output from the measurement target unit Measured, and performs measurement of the characteristics of the target portion.

According to a ninth aspect of the present invention, in the acoustic characteristic measuring apparatus according to the eighth aspect, the control unit is configured to control the characteristic signal read out from the read-out unit and the measurement signal after passing the system. The acoustic characteristic is measured by comparing the signal with the signal output from the measurement target unit.

According to a tenth aspect of the present invention, there is provided a characteristic signal recording medium including an audio area in which a characteristic signal is recorded and a program area in which a measurement program for performing measurement using the characteristic signal is recorded. Read out the measurement program from, read the characteristic signal based on the measurement program, output the characteristic signal to the measurement target unit, measure the signal output from the measurement target unit, and measure the characteristic of the measurement target unit. It is characterized by the following.

The invention according to claim 11 is the first invention.
0, the control unit measures the characteristic by comparing the characteristic signal input to the measurement target unit with a signal output from the measurement target unit after passing through the system of the measurement target unit. Is performed.

According to the first aspect of the present invention, since the characteristic signal and the measurement program suitable for the characteristic are recorded on one optical information medium, accurate and quick measurement processing can be performed.

According to the second aspect of the present invention, the characteristic signal and a measurement program suitable for the characteristic are recorded on one information recording medium, and the characteristic signal read from the information recording medium is transmitted to the measurement target section. A signal input and input to the measurement target unit is compared with a signal output from the measurement target unit based on a measurement program. The measurement program knows the amplitude and frequency of the input signal and the output signal at a certain time, so that the characteristics can be easily measured. Further, since the frequency of the harmonic of the signal output from the measurement target is determined as the harmonic component thereof from the frequency of the input signal, without using the FFT analysis,
It can be easily obtained by a measurement program. If only the amplitude and the approximate frequency of the signal output from the measurement target part are measured and the calculation for obtaining the total harmonic distortion is performed, the total harmonic distortion can be measured. Therefore, the frequency and amplitude can be measured more accurately and faster than before.

Further, the characteristic signal directly input to the personal computer is compared with a signal output after the characteristic signal is input to the measurement target unit and passed through the measurement target unit.
The characteristics were measured. For example, if the characteristic signal is a sine wave having a frequency of 10 Hz and an amplitude of -20 dB, Enhanced CD which is a recording medium for measuring acoustic characteristics is used.
Digital data and subcode data of a sine wave are recorded in an audio area (hereinafter referred to as En-CD), and En
-Record the frequency and amplitude corresponding to the subcode data in the program area of the CD. Whether the measurement uses the data of the audio area of the En-CD or the data of the program area of the En-CD is appropriately selected when the program is created.

Thus, the center frequency and the maximum amplitude are specified by the program from the selected track, and the amplitude and the time or frame recorded by the En-CD subcode data are determined on the program. Can be identified. Therefore, as before, F
More accurate and faster measurement without using FT analysis, etc.
For example, the total harmonic distortion can be measured. Also, if a program is created from output to measurement, the required data can be obtained quickly.

According to the third aspect of the present invention, since the recording medium for measuring acoustic characteristics is created as one form of En-CD, a program is recorded on a certain track as the program area, and is recorded on another track as the audio area. Audio data is recorded and can be used in a conventional CD player.

According to the fourth aspect of the present invention, since the recording medium for measuring acoustic characteristics is formed in another form of En-CD, the program is recorded in the index of a certain track as a program area, and the other area is recorded as an audio area. Since the audio data is recorded on the index or another track, the conventional CD player can be used.

According to the fifth aspect of the present invention, the recording medium for measuring acoustic characteristics is an enhanced M-CD of En-CD.
The program is recorded in a session (lead-in, program or three types of areas of audio data and lead-out is called one session), which is a program area, since the program is created in accordance with the music CD standard.
Since the audio data is recorded in the session that is the audio area, it can be used in a conventional CD player.

According to the sixth aspect of the present invention, in addition to the characteristic signal of the audio area, various items (for example, a type of a characteristic signal such as a sine wave and a frequency sweep signal, a frequency or an amplitude, etc.) so that a human can hear and recognize the characteristic signal. Since various items such as numerical values and track numbers) are recorded in voice, even if the data is reproduced using, for example, a conventional CD, the various items can be recognized only by listening to the voice, and data deficiency due to a description error or the like is eliminated.

According to the seventh aspect of the present invention, since a synchronization signal is recorded in addition to the characteristic signal in the audio area, the characteristic signal is directly input to the personal computer, and the characteristic signal is input to the measurement section. When comparing with the signal 2 output from the measurement target unit after passing through the measurement target unit, the time coincides if the synchronization signal is adjusted. In this case, the amplitude characteristics and the phase characteristics in the frequency characteristics can be accurately measured.

According to the eighth and tenth aspects of the present invention, the measurement is performed by reproducing the acoustic characteristic measurement recording medium on which the characteristic signal and the measurement program suitable for the characteristic signal are recorded. In the program area of the recording medium for acoustic characteristic measurement, which characteristic signal is recorded on which track in the audio area is programmed, so that the frequency and the maximum amplitude of the characteristic signal can be specified without using FFT analysis or the like. it can. Therefore, the center frequency and the maximum amplitude can be specified more accurately and earlier than in the past. Also, if a program is created from output to measurement, the required data can be obtained quickly.

According to the ninth and eleventh aspects of the present invention, the signal 1 in which the characteristic signal is directly input to the personal computer, and the signal 2 in which the characteristic signal is input to the object to be measured and output after passing through the portion to be measured , And the characteristics are measured. For example, in the case of frequency characteristic measurement, it is important how the output after the frequency sweep signal has passed through the measurement target section. The maximum amplitude of the input signal is specified by the selected track, and the amplitude of the recorded time or frame can be specified by the subcode data of the CD. Therefore, the input signal to the measurement target unit can be grasped without measurement, and if the time position of the output signal from the measurement target unit is synchronized, the frequency characteristics can be measured more accurately and faster than before.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an acoustic characteristic measuring apparatus according to an embodiment of the present invention. An example in which the audio amplifier 101 is measured as the measurement target unit 1 will be described. An audio amplifier 101 is connected to an En-CD drive 2 for playing an En-CD, which is an acoustic characteristic recording medium. The En-CD drive 2 is also connected to a personal computer 3.

First, the En-CD drive 2 is an En-CD drive.
The control program for the personal computer 3 is output from the program area of the CD, and the personal computer 3 displays a menu screen. FIG. 2 is an example of a menu screen displayed on the video display of the personal computer 3 for selecting measurement of various characteristics. For example, a measurement is selected by inputting a number from a keyboard or selecting a measurement screen with a mouse.

FIG. 3 is a table displayed on the video display of the personal computer 3 and showing the contents of each track in the audio area of the En-CD. For example, if “1. Total harmonic distortion measurement by sine wave” of menu 1 in FIG. 2 is selected, tracks 28 to 33 in FIG. 3 are displayed on the screen, and the acoustic characteristic measurement to be used for measurement is performed. The measurement is started by selecting or inputting the number indicating the signal for use.

If, for example, “1. Measurement of total harmonic distortion by sine wave” of menu 1 is performed on the menu screen shown in FIG. 2, the personal computer 3 first sets the En-C
D, the control program of the personal computer 3 is loaded from the program area, and the En-CD drive 2 is loaded with En.
-Output a sine wave from the audio area of the CD to the measurement target unit 1. Audio amplifier 10 that is the measurement target unit 1
A signal is output via a signal processing unit (not shown). A speaker output terminal, A
There are various types such as a UX output terminal, which are selected according to the measurement.

A signal output after passing through a signal processing unit (not shown) of the audio amplifier 101 contains a harmonic component as a distortion component. The sine wave including this harmonic is A /
The signal is converted into a digital signal by the D conversion circuit 4, input to the personal computer 3, and temporarily stored in a storage unit such as a hard disk. Further, the sine wave before being input to the audio amplifier 101 is directly input from the En-CD drive 2 to the personal computer 3 together with the data on the frequency and the maximum amplitude thereof, and stored in a storage unit such as a hard disk. The above is the basic configuration of the acoustic characteristic measuring device, and the measuring method will be described later in detail.

FIG. 4 shows another embodiment of the acoustic characteristic measuring apparatus according to the present invention. An example in which an audio amplifier 101, a speaker system 102, and a microphone 103 are measured as the measurement target unit 1 will be described. If the characteristics of the audio amplifier 101 and the microphone 103 have been measured in advance, it is easy to measure the characteristics of the speaker. Also in this case, En-CD
The drive 2 outputs a control program for the personal computer 3 from the program area of the En-CD, and the personal computer 3 displays a menu screen.

When, for example, the frequency characteristic measurement is selected on the menu screen, first, the personal computer 3 loads a control program for frequency characteristic measurement from the program area of the En-CD, and the En-CD drive 2
Outputs a frequency sweep signal from the En-CD audio area to the measurement target unit 1. In this example, the measurement target unit 1 includes an audio amplifier 101, a speaker 102, and a microphone 103. The frequency sweep signal passes through the signal processing unit of the audio amplifier 101,
Output from the speaker 102 and input to the microphone 103.

The microphone output is converted into a digital signal by the A / D conversion circuit 4, input to the personal computer 3, and temporarily stored in a storage unit such as a hard disk. The frequency sweep signal and the subcode signal, which is time information of the frequency sweep signal, input to the measurement target unit 1 are output from the En-CD drive 2 to the personal computer 3 in advance and stored in a storage unit such as a hard disk. . The subcode signal, which is time information, indicates a track, an index, hours, minutes, seconds, and a frame that are also recorded on a conventional CD. Information on the frequency, amplitude and phase of the frequency sweep signal is recorded in advance in the measurement program together with time information as to what value is recorded at a certain time corresponding to the subcode signal, and from the subcode signal As long as the obtained time information is obtained, the frequency, amplitude and phase corresponding to this time can be immediately specified. Instead of directly inputting the frequency sweep signal, it is also possible to record a numerical value of the frequency and amplitude at a certain time in the program area of the En-CD and send it to the storage unit. Also in this regard, the measuring method will be described later in detail.

FIG. 5 shows another embodiment of the acoustic characteristic measuring apparatus according to the present invention. An example in which a surround speaker system is measured as the measurement target unit 1 will be described. If the characteristics of the microphone 103 and the surround audio amplifier 104 have been measured in advance, it is easy to measure the characteristics of the surround speaker system. Also in this case, En-CD
Drive 2 starts from the En-CD program area.
Output a control program for the personal computer 3;
The personal computer 3 displays a menu screen.

In order to measure the impulse response selected on the menu screen, first, the personal computer 3 reproduces an impulse signal from the audio area of the En-CD by the En-CD drive 2 and outputs it to the measurement target unit 1. . The measurement target unit 1 includes a speaker 102, a microphone 103, and a surround audio amplifier 104. The impulse signal is input to the microphone 103 via the signal processing unit (not shown) of the surround audio amplifier 104 and the surround speaker system 102.

The impulse signal is converted into a digital signal by the A / D conversion circuit 4, input to the personal computer 3, and temporarily stored in a storage unit such as a hard disk. Also, surround audio amplifier 1
04 and the impulse to the speaker system are En-CD
The impulse signal and the subcode signal, which is time information, are directly output from the drive 2 to the personal computer 3 and stored in a storage unit such as a hard disk.

FIG. 6 shows another embodiment of the acoustic characteristic measuring apparatus according to the present invention. An example in which the reverberation characteristic of a concert hall is measured as a measurement target unit will be described. The measurement target unit 1 includes a microphone 103, a concert hall 105, and a source 106. If the input characteristics of the microphone 103 are known in advance, the reverberation characteristics of the concert hall 105 can be measured.
In this case as well, the same applies to En-CD drive 2 to En-C
An impulse is output from the audio area of D via the generation source 106, and a reverberation signal composed of a reflected sound of the concert hall 105 and a direct sound is input to the microphone 103.

The reverberation signal is supplied to an A / D conversion circuit 4
, And is input to the personal computer 3 and temporarily stored in a storage unit such as a hard disk. At the same time, the impulse output from the En-CD drive 2 to the personal computer to the generator 106 and the subcode signal as time information thereof are directly output,
It is stored in a storage unit such as a hard disk.

FIG. 7 shows another embodiment of the acoustic characteristic measuring apparatus according to the present invention. An example in which the frequency characteristic of a studio mixing console 107 is measured as the measurement target unit 1 will be described. Also in this case, a frequency sweep signal is output from the audio area of the En-CD drive 2. Measurement target part 1
The studio mixing adjustment console 107 outputs a frequency sweep signal via the signal processing unit.

The frequency sweep signal is represented by A /
The signal is converted into a digital signal by the D conversion circuit 4, input to the personal computer 3, and temporarily stored in a storage unit such as a hard disk. At the same time, a frequency sweep signal and a subcode signal as time information thereof are directly output from the En-CD drive 2 to the personal computer 3,
It is stored in a storage unit such as a hard disk.

FIG. 8 shows another embodiment of the acoustic characteristic measuring apparatus according to the present invention. An example in which the characteristics of the multimedia CD player 108 are measured as the measurement target unit 1 will be described. The measurement target unit 1 is a multimedia CD player 1.
A conventional CD player other than 08 may be used. This measurement is
For example, measurement of a characteristic of a D / A conversion circuit (not shown) of the multimedia CD player 108 is performed. En-C
The characteristic signal is output from the audio area of the En-CD of the D drive 2 and stored in the storage unit of the personal computer 3.

Multimedia CD which is the measurement target unit 1
The same En-CD is reproduced by the player 108, and the En-CD is reproduced.
The same sine wave is output from the audio area of the CD, input to the personal computer 3, and temporarily stored in a storage unit such as a hard disk. If the measurement is performed after adjusting the time so that the delay is eliminated by a synchronization signal or the like superimposed on the sine wave in advance, a correct frequency characteristic can be obtained. Also, En Multimedia CD player 108 is
If there is a function of reading the program from the program area of the CD and inputting the program to the personal computer 3, the En-CD drive 2 is not required, and the measurement time can be reduced. One of the features of the present embodiment is that the characteristics of the CD player can be measured in this manner.

FIG. 9 shows another embodiment of the acoustic characteristic measuring apparatus according to the present invention. An example of measuring a surround speaker system as a measurement target unit will be described. The measurement target unit 1 includes one center speaker 102, two speakers 102 and 2
A surround speaker system including two rear speakers 102 and a microphone 103. This measurement is performed by a control unit provided in the surround AV amplifier 5 instead of the personal computer in the past. More CD
It is assumed that the player is a multimedia CD player 108 capable of reproducing both an En-CD and a conventional CD.

The characteristics of the surround AV amplifier itself are stored in the control unit 5 in advance, and are corrected by a program so that only the characteristics of the speaker system can be measured. In this case, the multimedia CD player 108
Outputs a control program developed and designed exclusively for the surround AV amplifier from the program area of the En-CD, and the surround AV amplifier 5 outputs a menu screen to the video display 6.

The measurement content is selected from a menu screen displayed on the video display 6 by a remote controller or the like.
For example, when performing impulse response measurement,
The control unit 3 controls the multimedia CD player 108
Reproduces an impulse signal recorded in the audio area of the En-CD, and outputs this impulse after demodulation. Then, the impulse is output to a surround speaker system which is the measurement target unit 1 via a D / A conversion circuit and an amplification circuit, and a characteristic signal is input from the microphone 103.

The microphone output is converted into a digital signal by an A / D conversion circuit, and is input to the control unit of the surround AV amplifier 5. Further, the input impulse and a subcode signal as time information thereof are also input to the control unit. These data are stored in a storage unit such as a memory (not shown) of the control unit. From this, a transfer function is derived, an appropriate position of each loudspeaker is determined, and a correction instruction is output to the information video display 6. Thus, there is an advantage that the measurement according to the present invention is diversified and has a wide range of applications.

FIG. 10 is a flowchart of the measurement of the total harmonic distortion, which is one embodiment of the acoustic characteristic measuring method according to the present invention.
Step S1 is a step indicating the start of the processing operation shown in this flowchart. This shows a state in which an En-CD is reproduced, a program is read into a personal computer, and selection of various acoustic characteristics is awaited. Step S2 is a step of selecting the total harmonic distortion measurement. The number is input by selecting a number using a keyboard or selecting a screen using a mouse.

Step S3 is a step of reproducing the En-CD and reading the total harmonic distortion measurement program into a personal computer. Step S4 is a step of selecting a parameter used for measuring the total harmonic distortion. On a menu screen output to the personal computer, a parameter is selected by selecting a number using a keyboard or selecting a screen using a mouse.

Step S5 is a step of reproducing the characteristic signal from the audio area of the En-CD and outputting a sine wave for measuring the total harmonic distortion. Step S6 is a step of reading the frequency and the maximum amplitude of the sine wave recorded in the program area of the En-CD into the personal computer 3 based on the subcode data and the track number recorded together with the characteristic signal. This simplifies the program for measuring the total harmonic distortion. Also, at the time of reproduction, various items of the measurement program (for example, various types of characteristic signals such as sine waves and frequency sweep signals, numerical values such as frequency or amplitude, and various items such as track numbers) are read out using human voice.
It is easy for humans to recognize.

Step S7 is a step in which a sine wave including harmonics output through the measurement target section 1 is passed through a band-pass filter, and measurement is performed while moving the center frequency of the band-pass filter. Since the center frequency of the sine wave itself is known in advance, a harmonic having a frequency that is an integral multiple of that near the center frequency is moved. Step S8 is a step of performing arithmetic processing by a program. THD (Total Harmonic Distortio) indicates the total harmonic component contained in the output signal as a percentage of the fundamental component.
n). This THD is required. Then, the output characteristics of the measured total harmonic distortion are displayed. The frequency is plotted on the horizontal axis, and the total harmonic distortion factor is plotted on the vertical axis on a paper surface or on a display by a plotter.

Step S9 is a step for determining whether or not the measurement has been completed. If the measurement is completed, the process proceeds to step S8. If the measurement is not completed,
Returning to step S6, the measurement is repeated. Step S10
Is a step indicating the end. At this time, as in the case of the start, the main program is read into the personal computer, and a state of waiting for selection input of various acoustic characteristic measurements is shown.

FIG. 11 shows a flowchart of frequency characteristic measurement which is one embodiment of the acoustic characteristic measuring method according to the present invention. Step S11 is a step indicating the start of the processing operation shown in the flowchart. Play the En-CD,
This shows a state in which the main program is read into a personal computer and a selection input for various acoustic characteristic measurements is awaited. Step S12 is a step of selecting frequency characteristic measurement. The number is input by selecting a number using a keyboard or selecting a screen using a mouse.

Step S13 reproduces the En-CD,
This is a step of reading a frequency characteristic measurement program into a personal computer. Step S14 is a step of selecting parameters used for frequency characteristic measurement. On a menu screen output to the personal computer, a parameter is selected by selecting a number using a keyboard or selecting a screen using a mouse.

Step S15 is a step of reproducing the characteristic signal from the audio area of the En-CD and outputting a frequency sweep signal for frequency characteristic measurement. At this time, the subcode signal is input to the personal computer. Data indicating at what time this frequency sweep signal is output and at what time is recorded in advance in the program area of the En-CD, and this data is read into a RAM table. Can be confirmed by the program. This is necessary for comparing the input signal and the output signal in the frequency characteristic measurement program, and the frequency sweep signal at all points can be grasped in advance. Step S16 is a step of reading the frequency and maximum amplitude of the sine wave recorded in the program area of the En-CD into the personal computer 3 based on the subcode data and the track number recorded together with the characteristic signal. This allows
The program for measuring the total harmonic distortion is simplified. In addition, since various items of the measurement program are read out by a human voice at the time of reproduction, it becomes easy for a human to recognize.

Step S17 is a step of measuring the frequency sweep signal output through the measurement target section 1. If it is a frequency characteristic, it is to examine how the amplitude and phase of a frequency sweep signal having a certain frequency and amplitude change, so that the amplitude characteristic with respect to the frequency and the phase characteristic with respect to the frequency are obtained. Step S1
Reference numeral 8 denotes a step of performing arithmetic processing by a program and plotting the data on a paper surface or a display by a plotter. The amplitude characteristic with respect to the frequency and the phase characteristic with respect to the frequency are determined by a program, and the frequency is plotted on the horizontal axis, and the amplitude characteristic and the phase characteristic are plotted on the vertical axis on a paper surface or on a display.

Step S19 is a step for determining whether or not the measurement has been completed. If the measurement has been completed, the process proceeds to step S18. If the measurement has not been completed, the process returns to step S16 and repeats the measurement. Step S
20 is a step indicating the end. At this time, as in the case of the start, the main program is read into the personal computer, and a state of waiting for selection input of various acoustic characteristic measurements is shown.

FIG. 12 shows the respective data structures of the audio area and the program area of the acoustic characteristic measurement recording medium according to one embodiment of the present invention. In an En-CD having two types, an audio area and a program area, a program is recorded on a certain track as a program area, and audio data is recorded on another track as an audio area.

As another form of the En-CD of the present invention, a program is recorded in a certain index of a certain track as a program area, and audio data is recorded in another index of this track and another track as an audio area. En-CD may be used.

A program is recorded in a session as a program area (the three types of areas, lead-in, program or audio data and lead-out, are referred to as one session), and audio data is recorded in the session as the audio area. E
En- called enhanced music CD
It may be a CD.

Each of the formats of the recording medium for measuring acoustic characteristics is an embodiment of the En-CD having a program area and an audio area, but the recording medium for acoustic characteristics according to the present invention has a program area and an audio area. It can be manufactured without limitation to the above-described En-CD embodiment.

FIG. 13 shows an example of Enhanced
2 shows a structure of an audio area and a program area according to a Music CD. Each session has three types of areas: lead-in, program or audio data and lead-out. The recording medium for measuring acoustic characteristics of the present invention has two sessions, an audio area and a program area.

FIG. 14 is a diagram showing an input signal input to the measurement target portion and an output signal output through the measurement target portion in the measurement method of the present invention. As can be seen from FIG. 14, the input signal is delayed compared to the output signal due to the processing of the personal computer or the like. For example, in the measurement of frequency characteristics, the problem is how much amplitude and phase are output for which frequency, and it must accurately correspond to a frequency sweep signal whose frequency changes gradually from low frequency to high frequency . However, this delay is not a time delay that changes with frequency as in the case of frequency characteristics, but a delay of the system. Therefore, measurement can be performed by correcting the delay.

As an example of the correction method, a synchronization signal is inserted into the characteristic signal as shown in FIG. This synchronization signal is
Since the time is matched when comparing the characteristic signal with the signal output from the measurement target unit, the characteristic signal is compared with the signal output from the measurement target unit, so that accurate measurement can be performed.

Further, in the program area, data relating to an input signal to the measurement target portion, for example, 1 kHz
Details can be described, such as inputting 0 dB data to a frame of 00: 00: 00: 00 as the recording start time of the sine wave, the level 0 dB, the channel L, and the characteristic signal. Therefore, as the characteristic signal when the characteristic signal is output to the personal computer 3, the digital audio data of the sine wave read from the audio area of the En-CD and the sine wave read from the program area of the En-CD are used as the characteristic signal. There are two types: digital data. Specifically, the sine wave digital audio data read from the En-CD audio area is digital audio data that becomes a sine wave by D / A conversion. The digital data of the sine wave read from the program area of the En-CD is
The digital audio data of the sine wave read from the audio area of the n-CD is numerical data readable by a personal computer. These are selected by a program, and using either of them, the characteristic signal input to the device to be measured and the characteristic signal output from the device to be measured by the characteristic signal recorded on the recording medium for acoustic characteristic measurement The comparison with the characteristic signal can be performed.

[0075]

According to the present invention, a control section of a personal computer or the like can be used in a short time and with high accuracy by using an Enhanced CD in which a characteristic signal and a control program for performing a measurement process corresponding to the characteristic signal are recorded. Measurement is performed in a lump, real-time processing can be performed without requiring time for measurement.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of an acoustic characteristic measuring device according to the present invention.

FIG. 2 is a screen view of an embodiment of an acoustic characteristic measuring device according to the present invention.

FIG. 3 is a diagram illustrating an acoustic characteristic measuring apparatus according to an embodiment of the present invention, which is displayed on a display of a personal computer;
-Screen diagram of a table showing the contents of each track in the audio area of the CD.

FIG. 4 is a configuration diagram of another embodiment of the acoustic characteristic measuring device according to the present invention.

FIG. 5 is a configuration diagram of another embodiment of the acoustic characteristic measuring device according to the present invention.

FIG. 6 is a configuration diagram of another embodiment of the acoustic characteristic measuring device according to the present invention.

FIG. 7 is a configuration diagram of another embodiment of the acoustic characteristic measuring device according to the present invention.

FIG. 8 is a configuration diagram of another embodiment of the acoustic characteristic measuring device according to the present invention.

FIG. 9 is a configuration diagram of another embodiment of the acoustic characteristic measuring device according to the present invention.

FIG. 10 is a flowchart of a total harmonic distortion measurement in the acoustic characteristic measuring method according to one embodiment of the present invention.

FIG. 11 is a flowchart of frequency characteristic measurement in the acoustic characteristic measuring method according to one embodiment of the present invention.

FIG. 12 is a structural diagram showing respective data structures of an audio area and a program area of an acoustic characteristic measurement recording medium according to one embodiment of the present invention.

FIG. 13 is a structural diagram showing the structure of an audio area and a program area according to an Enhanced Music CD.

FIG. 14 is a characteristic diagram of an output signal to the measurement target portion recorded in the measurement according to the present invention and an input signal input through the measurement target portion.

FIG. 15 is a configuration diagram of a conventional acoustic characteristic measurement system for measuring output characteristics of a CD player.

FIG. 16 is a configuration diagram of a conventional acoustic characteristic measurement system for measuring a frequency characteristic output from a speaker.

[Description of Signs] 1 ... Measurement target unit 2 ... En-CD drive 3 ... Personal computer 4 ... A / D conversion circuit

Claims (11)

[Claims] 1. A recording medium for measuring acoustic characteristics, comprising: an audio area in which a characteristic signal is recorded; and a program area in which a measurement program for performing measurement using the characteristic signal is recorded. Recording medium for measuring acoustic characteristics. 2. A recording medium for measuring acoustic characteristics, comprising: an audio area in which characteristic signals are recorded; and a program area in which a measurement program for performing measurement using the characteristic signals is recorded. A measurement program for comparing the characteristic signal input to the measurement signal with the signal output from the measurement target unit after passing through the measurement target unit is recorded in a program area. recoding media. 3. The recording medium for measuring acoustic characteristics according to claim 1, wherein the measurement program and the characteristic signal are recorded on different tracks. . 4. The recording medium for measuring acoustic characteristics according to claim 1, wherein the characteristic signal is recorded on a track or an index different from a track or an index on which the measurement program is recorded. Characteristic recording medium for measuring acoustic characteristics. 5. The acoustic characteristic measuring recording medium according to claim 1, wherein the characteristic signal is recorded in a session different from a session in which the measuring program is recorded. Recording medium for measuring characteristics. 6. The recording medium for measuring acoustic characteristics according to claim 1, wherein the characteristic signal and various items of data of the measurement program are recorded as audio data in the audio area. Recording medium for measuring acoustic characteristics. 7. The recording medium for acoustic characteristics measurement according to claim 1, wherein a synchronization signal is added to said characteristic signal. 8. An audio characteristic measuring recording medium having an audio area in which a characteristic signal is recorded and a program area in which a measuring program for performing measurement using the characteristic signal is recorded. A reading unit for reading the measurement program; a display unit for displaying the measurement content of the characteristic based on the measurement program read from the reading unit; and a selection unit for selecting the measurement content displayed on the display unit An input unit; and a control unit to which the readout unit, the display unit, and the selection input unit are respectively connected. The control unit reads the measurement program from the readout unit, and based on the measurement program, The characteristic signal is read from the readout unit and input to the measurement target unit. The signal output from the measurement target unit is measured, and the characteristic of the measurement target unit is measured. Acoustics measuring apparatus characterized by performing the measurement. 9. The acoustic characteristic measuring apparatus according to claim 8, wherein the control unit outputs the characteristic signal read from the reading unit and the measurement target unit after passing through the system of the measurement target unit. An acoustic characteristic measuring device for measuring acoustic characteristics by comparing with a signal. 10. The measurement program is read from a characteristic signal recording medium having an audio area in which a characteristic signal is recorded and a program area in which a measurement program for performing measurement using the characteristic signal is recorded. Reading the characteristic signal based on the measurement program, outputting the characteristic signal to a measurement target unit, measuring a signal output from the measurement target unit, and measuring a characteristic of the measurement target unit; Method. 11. The acoustic characteristic measuring method according to claim 10, wherein the control section outputs the characteristic signal input to the measurement target section and a signal output from the measurement target section after passing through the system of the measurement target section. A characteristic measurement method characterized by measuring a characteristic by comparing with an acoustic characteristic.