JPH06311591A - Automatic adjusting system for audio device - Google Patents

Abstract

PURPOSE:To immediately make decision by deciding whether or not the arithmetic operation of an arithmetic means is possible by comparing a target curve with a measuring curve, and raising an alarm to the effect of expediting to change the target curve when no arithmetic operation is possible. CONSTITUTION:The measuring noise from the measuring noise generating part 61 of an analyzer 6 is supplied to a DSP part, and it is inputted to a speaker. A tone from the speaker is collected by a microphone, and is inputted to a microphone tone analysis part 60, and the frequency characteristic of an audio signal from the speaker is measured, thereby, the measuring curve can be obtained. Furthermore, the mean level of the frequency characteristic is calculated, and it is sent out to a control part 70. After that, the mean level value of the target curve is made to coincide with the mean level of the frequency characteristic, and difference between the mean levels is found, and it is decided whether or not the difference is within a prescribed value. When it exceeds the prescribed value, the change of the target curve, i.e., an alarm message to expedite re-input is displayed on a display part 73. In such a case, the numeric value of the difference of the mean level values can be also displayed.

Description

Detailed Description of the Invention

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for adjusting an audio device for acoustically correcting a sound signal obtained from a predetermined sound source.

[0003]

[0002]

[0004]

2. Description of the Related Art A tape or a compact disc (hereinafter referred to as "CD") on which audio information such as music information is recorded.
For a sound signal obtained from a recording medium such as a sound source and other sound sources, a parametric equalizer (hereinafter referred to as "P-EQ") is used to emphasize a specific frequency band, or a digital sound processor (hereinafter referred to as "DSP"). A technique relating to an adjustment system of an audio device that performs so-called acoustic correction, such as sound field correction using (referred to as), is widely known. In particular, in recent years, vehicle-mounted audio devices equipped with such a sound correction function have become widespread.

[0005]

In such a vehicle-mounted audio device, the size and shape of the passenger compartment, the material of the seat, the accessories in the vehicle, and the like vary from vehicle to vehicle, so the acoustic environment is not the same. That is, even if the same acoustic correction operation setting is performed, the same acoustic effect is not always obtained.

[0006]

Therefore, when such an audio device is installed in a car, an expert such as a dealer can change the data of the P-EQ parameter while listening to the sound actually emitted from the speaker after the installation. The amplifier gain was changed, the data was stored in the memory in the device, and the optimum adjustment was made for the acoustic environment of the car.

[0007]

[0005]

[0008]

However, in the above-mentioned conventional technique, a great amount of time is required for adjustment because the P-EQ parameter is changed and the amplifier gain is changed while actually listening to the sound emitted from the speaker. In addition to the above, the adjustment result varies depending on the type of music to be played, the skill of an expert to adjust and the mood at that time, and there is a problem that universal adjustment cannot be performed. In such adjustment, particularly when setting the frequency characteristic of the audio signal to a desired target curve, whether or not the setting data according to the target curve can be realized is a trial and error repetition, and the judgment is made even by an expert. It was a very difficult task.

[0009]

The present invention solves the problems of the prior art as described above. It is possible to perform universal adjustment in a short time and determine whether setting data corresponding to a target curve can be realized. It is an object of the present invention to provide an excellent automatic audio system adjustment system that can be performed immediately.

[0010]

[0007]

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned conventional object, the present invention is a sound for correcting frequency characteristics of a sound signal obtained from a predetermined sound source based on preset setting data. Correction means, a speaker that emits sound according to the corrected audio signal, calculation means that calculates the setting data based on an input target curve and supplies the sound correction means, and sound from the speaker. Voice analysis means to obtain the measurement curve by analyzing the frequency characteristics of
A determination unit that compares the target curve and the measurement curve to determine whether or not the calculation of the calculation unit is possible, and if the calculation is not possible, a determination unit that issues a warning to prompt a change of the target curve; Is provided.

[0012]

[0008]

[0013]

Therefore, according to the automatic adjusting system of the audio apparatus of the present invention, it is determined whether or not the setting data can be calculated by comparing the target curve and the measurement curve, and the determination can be performed immediately. Universal adjustments can be made in a short time.

[0014]

[0009]

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[0016]

FIG. 1 is a block diagram showing the configuration of an automatic adjustment system for an audio device according to the present invention. In FIG. 1, among the connection lines that connect the blocks, the solid line indicates a signal line for transmitting an audio signal, and the dotted line indicates a control line for transmitting a control signal. Reference numeral 1 denotes a center unit as a main body device, which receives a command from an operation unit, and by a master microcomputer installed therein, a source unit such as a tuner unit, a tape deck, a CD deck, and a CD autochanger as a sound source. The slave microcomputer is intensively controlled via a computer line to select and output the audio signal of the source according to the operation.

[0017]

Reference numeral 2 denotes a DSP section as acoustic correction means, which performs acoustic correction on the audio signal output from the center unit 1 to create a sound field rich in realism. Three
Is a main amplifier, which amplifies and outputs an analog audio signal output from the DSP unit 2. This main amplifier 3
Can amplify and output audio signals of up to 14 channels as described later. 4 is a speaker,
It receives a voice signal from the main amplifier 3 and generates a sound.

[0018]

An audio analyzer 5 is composed of an analyzer 6 and a personal computer 7. PC 7
The control line between the DSP unit 2 and the DSP unit 2 is composed of RS232C, and the signal line from the analyzer 6 to the DSP unit 2 is composed of an optical cable. Further, 8 is a microphone, which inputs an audio signal obtained by collecting the sound generated from the speaker 4 to the analyzer 6. 1a is the center unit 1
Is a remote control for remote control.

[0019]

FIG. 2 is a block diagram showing the internal structure of the DSP section 2 in FIG. In FIG. 2, reference numeral 20 denotes an audio input unit, which selectively selects either the audio signal output from the center unit 1 or the reference audio signal output from the analyzer 6 according to a selection signal supplied. Output. Reference numeral 21 is a P-EQ adjustment unit, which emphasizes a specific frequency band by given parameter data and corrects the frequency characteristic of the input audio signal.

[0020]

Reference numeral 22 denotes a network adjustment unit, which is PE
The audio signal sent from Q21 is divided into a plurality of frequency bands and output, and so-called time alignment correction is performed to adjust the transmission time to reach each speaker. A communication unit 23 processes a control signal transmitted to and from the personal computer 7. In the case of this embodiment, it is composed of an RS232C interface. A microcomputer 24 controls the operation of the DSP unit 2. 25 is a backup memory, P-EQ
Reference numeral 21 is a storage means for storing parameter data for acoustic correction, which is composed of an E ² PROM or the like.

[0021]

Reference numerals 26 to 29 denote D / A converters, which convert the digital audio signals for each band sent from the network adjustment unit 22 into analog audio signals. The D / A conversion unit 26 is for a subwoofer, and converts and outputs L-channel and R-channel ultra-low frequency audio signals. The D / A converter 27 is for the woofer, and the front and rear channels are the L channel and the R channel, respectively.
Converts and outputs a total of 4 channels of low-channel audio signals. Similarly, the D / A converters 28 and 29 also convert the middle and high range audio signals of the L channel and the R channel for the front and rear channels, respectively, and output them. Therefore, D / A
The converters 26 to 29 convert digital audio signals of a total of 14 channels into analog audio signals and send them out.

[0022]

FIG. 3 is a block diagram showing the internal structure of the audio analyzer 5 shown in FIG. In the analyzer unit 6 of FIG. 3, reference numeral 60 denotes a microphone sound analysis unit, which converts an analog voice signal input from the microphone 8 into a digital signal, analyzes the voice signal with a built-in microcomputer, and sends analysis data. At the same time, the control signal is transmitted to and from the personal computer 7. Reference numeral 61 is a measurement noise generating unit, which sends a reference voice signal as pink noise to the DSP unit 2 and causes the personal computer 7 to use a built-in microcomputer.
Control signals are transmitted to and from.

[0023]

In the personal computer section of FIG. 3, reference numeral 70 is a control section composed of a microcomputer or the like. As described above, a control signal is sent between the microphone sound analysis section 60 and the measurement noise generation section 61 of the analyzer section 6. To transmit. Reference numeral 71 denotes a communication unit, which sets the parameters of the P-EQ adjustment unit 21 of the DSP unit 2, the time alignment and the network gain of the network adjustment unit 22 based on the communication procedure of RS232C with the communication unit 23 of the DSP unit 2. The control signal and data for determination are transmitted.

[0024]

Reference numeral 72 denotes a key input section, which can set the frequency characteristic of the audio signal to a desired characteristic curve (hereinafter referred to as "target curve") by operating the key. A display unit 73 displays a main menu, a tuning menu, confirmation of speaker connection, etc. when performing automatic adjustment, and various data during adjustment. A printing unit (printer) 74 can print not only the result data after completion of the adjustment but also any data during the adjustment.

[0025]

Reference numeral 75 denotes a data storage unit, which stores P-EQ2 on a recording medium such as a floppy disk or a hard disk.
1. Parameter data of time alignment and network gain and data of target curve can be stored and saved. Therefore, after the current setting data is stored in the data storage unit 75 when performing the automatic adjustment, it is possible to restore the original setting data even if the desired characteristic cannot be obtained as a result of the automatic adjustment.

[0026]

Next, an automatic adjusting method using the automatic adjusting system of the audio apparatus will be described. FIG. 4 is a flowchart showing the automatic adjustment method in the embodiment of the present invention. In FIG. 4, first, the audio system and the audio analyzer are connected (step S1).
Specifically, this connection is made by connecting the optical cable of the analyzer 6 to the audio input terminal of the DSP unit 2 shown in FIG. 1, and connecting the RS232 from the personal computer 7 to the RS232C terminal of the DSP unit 2.
Connect the C cable. In this case, the voice input terminal has 3
Since two terminals are provided, the signal line from the center unit 1 and the signal line from the CD autochanger (not shown) can be connected to the analyzer 6 without any change. However, it is also possible to configure one or two input terminals and connect the analyzer 6 instead of connecting the center unit 1 or the CD autochanger during automatic adjustment without providing a terminal dedicated to the special analyzer.

[0027]

When the connection is completed, the display section 7 of the personal computer 7
The key input section 72 according to the menu of the 3 main menu
By pressing a predetermined key indicating tuning, the current data and backup data are loaded from the DSP unit 2 into the main memory of the personal computer 7 (step S2), and the display unit 73 displays the tuning menu.
This tuning menu has items such as auto tuning, manual tuning, parameter adjustment, and sound confirmation, which correspond to the keys of the key input unit 72, and the tuning item is selected by pressing the corresponding key (step S3). .

[0028]

When the item of auto tuning is selected here, a menu for position selection is displayed. In this position selection item, items such as "FULL SEAT" for selecting all speakers and "FRONT R" for selecting the R channel of the front part can be selected, and the position for setting the microphone 8 is selected. The message to be specified according to is displayed.

[0029]

When the position selection is completed, the process proceeds to the network setting process (step S4). In this network setting, the cutoff frequency, slope and phase of the network value are selected. For example, in the case of 3 ways, by pressing the corresponding key, the low range (Lo
The cutoff frequency of the low-pass filter in w) is set to 2
kHz, slope 12 dB / oct, L, R
Select the channel phase to be "+".

[0030]

After the network setting, the process proceeds to the amplifier gain adjustment (step S5). In this adjustment, the measurement noise generator 61 of the analyzer unit 6 supplies pink noise, which is a reference audio signal, to the DSP unit 2, and the speaker 4 emits a sound corresponding to the pink noise. In this case, the volume from the speaker 4 is set to a predetermined value by adjusting the gain of the amplifier 3 that supplies the audio signal to the speaker 4 selected by pressing each corresponding speaker 4 and pressing the corresponding key. Set to

..

Next, the process shifts to time alignment adjustment (step S6). Since the transmission distance from the sound source is different at the position where each speaker is arranged in the vehicle compartment, the main amplifier 3
The times when the audio signals output from the speakers reach the speakers 4 are not the same. Therefore, if some kind of correction is not performed, the phase of the sound from each speaker will be scattered, and the sound quality will be significantly impaired. Therefore, the network adjustment unit 22 of the DSP unit 2 is provided with a delay unit for time correction to automatically perform time alignment adjustment.

[0032]

When the time alignment adjustment is completed, a target curve input process is started (step S7). When inputting this target curve, first check the current frequency characteristic.
After that, either the new setting or the file call of the already set curve is selected. In the case of a new setting, marks of up to 31 bands are defined on the frequency axis and displayed as a 31-point line graph. While referring to this line graph, the user marks the frequency point to be set by key operation and sets the level of the marked point by key operation.

[0033]

When the input of the target curve setting is completed, it is determined whether the input target curve is within the correction range, that is, whether it can be realized (step S8). When it is determined that it is not within the correction range, a warning is issued to the user to prompt readjustment of the amplifier gain. Further, when the amplifier gain is readjusted but the correction range is not reached, the user is prompted to change the network value or the target curve.

[0034]

When it is determined in step S8 that the target curve is within the correction range, network gain adjustment is performed according to the set target curve (step S9), and each channel gain of the network is automatically set. . If it is determined that the target curve is not within the correction range, a warning message will be issued, which will be described later.

[0035]

Further, P-EQ adjustment is performed (step S1).
0), f ₀ , Q, and gain are automatically set. Furthermore, level difference adjustment is performed (step S11), and L channel and R
It automatically adjusts the level difference between the channel and the front and rear. This is to correct a slight change in the level difference due to the parameter setting in the P-EQ adjustment.

[0036]

Next, the tuning result is displayed, and the tuning result is printed from the printing section 74 of the personal computer section 7 in response to the user's key operation for print selection (step S12).

[0037]

Then, it is judged whether or not the tuning is completed (step S13). This judgment is made by the user's selection of key depression, but in the present embodiment,
The microphone 8 can be installed not only in the front driver's seat but also in the passenger's seat, the entire front, the rear seat side, the entire passenger compartment, etc. because it is possible to perform auto tuning even if it is installed in another position. This will prompt the user to select whether to perform auto tuning in or to end auto tuning.

[0038]

When the auto-tuning is completed and all the tunings are completed, it is judged whether or not to return to the state before the adjustment (step S14). This may be because the result of auto-tuning may not be the desired characteristic, so when returning to before adjustment, the data before adjustment stored in the data storage unit 75 of the personal computer unit 7 is called and the DSP unit 2 is called. Data is transferred (step S
15).

[0039]

In step S14, if the data is not returned before the adjustment, it is determined by the user's key operation whether or not to back up the automatically adjusted data (step S1).
6). When backing up, data is transferred to the backup memory 25 of the DSP unit 2 (step S17)
This flow is terminated, and if not backed up, it is terminated as it is.

[0040]

Next, the determination of whether the target curve is within the correction range in step S8 of FIG. 4 will be described.
FIG. 5 is a flowchart for determining the target curve.

[0041]

Key input section 72 of audio analyzer 5
When the target curve is input from (step S21), the average level value of the target curve is calculated (step S2).
2). FIG. 6 shows the target curve A and the average level Aa of the target curve. The data of the target curve A and the average level Aa of the target curve is stored in the data storage unit 75 and also displayed on the display unit 73.

[0042]

Next, the measurement noise generating section 61 of the audio analyzer 5 supplies the measurement noise as the reference audio signal to the DSP section 2 through the optical cable, and the measurement noise amplified by the power amplifier 3 is supplied to the speaker 4. input.
Then, the sound from the speaker 4 is collected by the microphone and input to the microphone sound analysis unit 60 of the audio analyzer 5 to measure the frequency characteristic of the audio signal from the speaker 4 (step S23) to obtain the measurement curve. . Further, the average level value of this frequency characteristic is calculated (step S24), and the data is transmitted to the control unit 70. Figure 7 shows the frequency characteristics B
And the average level value Ba of the frequency characteristics. The frequency characteristic B and the average level value Ba of the frequency characteristic are stored in the data storage unit 75 and also displayed on the display unit 73.

[0043]

Thereafter, the average level value of the target curve and the average level value of the frequency characteristic are made to coincide with each other, and the difference between these average level values is obtained (step S25). Then, it is determined whether the difference is within a predetermined value (140 dB in this case) (step S26). As a result of the judgment, the difference is 14
When it exceeds 0 dB, a warning message for prompting the change of the target curve, that is, re-input is displayed on the display unit 73 (step S27). In this case, the numerical value of the difference between the average level values can also be displayed.

[0044]

FIG. 8 is a diagram showing a method for obtaining the difference between the average level values. In FIG. 8A, the average level Aa of the target curve A and the average level Ba of the measured frequency characteristic B are shown.
Move (shift) so that there is no difference with. Figure 8
(B) is the average level ABa that the two agree with after moving
And the target curve A and the frequency characteristic B are shown. In FIG. 8B, the level difference between the target curve A and the frequency characteristic B is represented by hatching, and the absolute value of the area of the hatched area is obtained. Then, it is determined whether or not the value obtained by normalizing the obtained total area with the frequencies of all bands exceeds 140 dB.

[0045]

Therefore, the user re-inputs the target curve from the key input unit 72 based on the warning message on the display unit 73 until the difference between the average level value of the target curve and the average level value of the frequency characteristic is within 140 dB. To do.

[0046]

That is, the microphone sound analysis unit 60 constitutes a voice analysis means, and the control unit 70 of the audio analyzer 5 is used.
Is a means for calculating setting data based on the input target curve and supplying it to the DSP unit 2, and comparing the target curve with the measurement curve to determine whether or not the setting data can be calculated. It has a determination means for displaying a warning message when calculation is not possible.

[0047]

As described above, in the system configuration of FIGS. 1 to 3, by setting the target curve based on the flowchart of FIG. 5, it is possible to immediately determine whether or not the setting data can be calculated by the input target curve. You can

[0048]

[0042]

[0049]

As is apparent from the above embodiments, according to the automatic adjustment system for an audio apparatus of the present invention, the input target curve is compared with the measurement curve obtained by measuring the frequency characteristic of the sound from the speaker. , It is determined whether the setting data can be calculated by the target curve, and if it is not possible, a warning is issued so that the judgment can be made immediately and universal adjustment can be performed in a short time. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an automatic adjustment system for an audio device according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of a DSP unit 2 in FIG.

3 is a block diagram showing an internal configuration of an audio analyzer 5 in FIG.

FIG. 4 is a flowchart showing an automatic adjustment method in an embodiment.

FIG. 5 is a flowchart for determining a target curve in the present invention.

FIG. 6 is a diagram showing a target curve and its average level value.

FIG. 7 is a diagram for comparing the measured frequency characteristic and its average level value, and the target curve and its average level value.

FIG. 8 is a diagram showing a method of obtaining a difference between average level values.

[Explanation of symbols]

 1 Center unit (main unit) 2 DSP section (acoustic correction means) 4 Speaker 8 Microphone 5 Audio analyzer 60 Microphone sound analysis section (voice analysis means) 61 Measurement noise generation section 70 Control section 72 Key input section 73 Display section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number for FI Technical indication H04S 7/00 Z 8421-5H (72) Inventor Issei Kikuchi 5-35-2, Shirayama, Bunkyo-ku, Tokyo No. Clarion Co., Ltd.

Claims (2)

[Claims] 1. An acoustic correction means for correcting frequency characteristics of an audio signal obtained from a predetermined sound source based on preset setting data, and a sound is emitted according to the corrected audio signal. A speaker; a computing unit that computes the setting data based on an input target curve and supplies the setting data to the acoustic correction unit; and a voice analysis unit that analyzes the frequency characteristics of the sound from the speaker to obtain a measurement curve. A determination unit that compares the target curve and the measurement curve to determine whether or not the calculation of the calculation unit is possible, and if the calculation is not possible, a determination unit that issues a warning to prompt a change of the target curve; Automatic adjustment system for audio equipment equipped with. 2. The automatic adjustment of an audio apparatus according to claim 1, wherein the determination means issues the warning when a difference between average level values of the target curve and the measurement curve exceeds a predetermined value. system.