JPH06311585A - System and method for automatic adjustment for audio - Google Patents

Abstract

PURPOSE:To perform adjustment in a short period of time by supplying a reference audio signal, analyzing an audio signal obtained by collecting a sound emitted from a speaker by a microphone corresponding to the signal, and setting acoustic correction based on analyzed result. CONSTITUTION:A pink noise being the reference audio signal is supplied from an analyzer 6 to a DSP part 2, and a sound in accordance with the noise is emitted from the speaker 4. The sound is collected by the microphone 8, and is inputted to the analyzer 6, and sound volume from the speaker 4 is set at a value determined in advance by adjusting the gain of an amplifier 3 which supplies the audio signal to the pertinent speaker 4. In other words, when it is decided that a target curve is within a correction range, the adjustment of a network gain is performed corresponding to the target curve, thereby, each channel gain of a network is automatically set. Also, the adjustment of a parametric equalizer is performed, and the automatic setting of gains f0, Q are performed. Furthermore, level adjustment is performed automatically.

Description

Detailed Description of the Invention

[0001]

[0001]

[0002]

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

[0003]

[0002]

[0004]

2. Description of the Related Art Parametric equalizers (hereinafter referred to as "P-EQ") are applied to recording media such as tapes and compact discs (hereinafter referred to as "CD") on which music information is recorded, and audio signals obtained from other sound sources. Is used to emphasize a specific frequency band, and a digital sound processor (hereinafter referred to as “DSP”) is used to correct a sound field. The technology regarding 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.

[0009]

Further, if the user cannot know the objective data of the acoustic correction and the data stored in the memory in the apparatus is lost for some reason, the user should adjust the same acoustic correction. There was also the problem that it was very difficult.

[0010]

The present invention solves the problems of the prior art as described above. The universal adjustment can be performed in a short time, and even if the data stored in the memory is lost, the same adjustment can be performed. It is an object of the present invention to provide an excellent automatic adjustment system and automatic adjustment method for an audio device that can be adjusted for acoustic correction.

[0011]

[0008]

[0012]

In order to achieve the above-mentioned conventional objects, an automatic adjustment system for an audio apparatus according to the present invention is a main body apparatus for transmitting a sound signal obtained from a predetermined sound source and an acoustic correction command according to an operation. And an acoustic correction unit that applies a preset acoustic correction to the audio signal based on the acoustic correction command, a speaker that generates a sound according to the audio signal obtained from the acoustic correction unit, and a speaker that generates the sound. And a correction setting information for supplying a reference voice signal to the acoustic correction means to analyze a voice signal obtained from the microphone and setting the acoustic correction based on the analysis result. Acoustic characteristic setting means to be supplied to the acoustic correction means.

[0013]

Further, according to the automatic adjusting method for an audio device of the present invention, the audio correction means for applying the audio correction preset to the audio signal based on the audio signal and the audio correction command from the main body device, to the reference audio signal. Is supplied to analyze the audio signal obtained by collecting the sound generated from the speaker with the microphone according to the reference audio signal, and based on the analysis result, the correction setting information for setting the acoustic correction is provided. It is supplied to the acoustic correction means.

[0014]

[0010]

[0015]

Therefore, according to the automatic adjusting system and the automatic adjusting method of the audio apparatus of the present invention, the sound generated from the speaker is collected by the microphone in accordance with the reference sound signal supplied to the sound correcting means for correcting the sound. The sound signal obtained is analyzed, and the acoustic correction is automatically adjusted based on the analysis result, so universal adjustment can be performed in a short time and the acoustic correction stored in the memory is used. Even if the data is lost, the same acoustic correction can be adjusted.

[0016]

[0011]

[0017]

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

[0018]

FIG. 1 is a block diagram showing the configuration of an automatic adjustment system for an audio apparatus 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.

[0019]

Reference numeral 2 denotes a DSP section as an acoustic correction means, which can perform acoustic correction on the audio signal output from the center unit 1 to obtain a frequency characteristic preferred by the user. A main amplifier 3 amplifies and outputs an analog audio signal output from the DSP unit 2. The main amplifier 3 can amplify and output up to 14 channels of audio signals as described later. Reference numeral 4 denotes a speaker, which receives a voice signal from the main amplifier 3 and generates a sound.

[0020]

Reference numeral 5 is an audio analyzer as an acoustic characteristic setting means which constitutes the characteristic system of the present invention, and is composed of an analyzer 6 and a personal computer 7.
The control line between the personal computer 7 and the DSP unit 2 is RS232C.
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. Reference numeral 1a is a remote controller for remotely operating the center unit 1.

[0021]

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.

[0022]

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.

[0023]

Numerals 26 to 29 are 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 converter 26 is for a subwoofer, and converts and outputs L-channel and R-channel very low frequency audio signals. The D / A converter 27 is for a woofer, and converts and outputs audio signals of a total of four channels of low frequencies of the L channel and the R channel for the front and the rear, respectively. 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, the D / A converters 26 to 29 convert digital audio signals of a total of 14 channels into analog audio signals and send them out.

[0024]

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.

[0025]

In the personal computer section of FIG. 3, 70 is a control section composed of a microcomputer and the like, and as described above, the microphone analysis section 60 and the measurement noise generation section 6 of the analyzer section 6 are described.
Control signals are transmitted to and from 1. 71 is a communication unit,
Based on the communication procedure of RS232C with the communication unit 23 of the DSP unit 2, parameters of the P-EQ adjustment unit 21 of the DSP unit 2, control signals for determining the time alignment and network gain of the network adjustment unit 22, and Transmits data.

[0026]

Reference numeral 72 denotes a key input unit, which can set the frequency characteristic of the audio signal to a desired characteristic curve (hereinafter referred to as "target curve") by operating a 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.

[0027]

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.

[0028]

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.

[0029]

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). .

[0030]

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.

[0031]

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 "+".

[0032]

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.

[0033]

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 no correction is 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.

[0034]

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.

[0035]

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.

[0036]

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. . In addition, 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.

[0037]

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).

[0038]

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.

[0039]

When the auto tuning is completed,
It is determined whether to return to the state before adjustment (step S1)
4). 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 S15).

[0040]

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.

[0041]

As described above, in the system configuration of FIGS. 1 to 3, by performing the automatic adjustment based on the flow chart of FIG. 4, the adjustment time can be shortened to about 30 minutes, and the skill of an expert of adjustment can be reduced. You can make universal adjustments that are independent of your mood. Further, even if the acoustic correction data stored in the memory is lost, the same acoustic correction can be adjusted based on the data stored in the data storage unit 75 of the personal computer unit 7.

[0042]

In the above embodiment, the case where the frequency characteristic of the audio signal is mainly adjusted has been described.
Even when a sound field such as a concert hall or a live house is created using the SP section, it is possible to apply the present invention to realize a system for automatically setting sound field correction data.

[0043]

[0037]

[0044]

As is apparent from the above embodiments, according to the automatic adjusting system and the automatic adjusting method of the audio apparatus of the present invention, the speaker is output from the speaker in accordance with the reference sound signal supplied to the sound correcting means for performing the sound correction. A sound signal obtained by collecting the generated sound with a microphone is analyzed, and the acoustic correction is automatically adjusted based on the analysis result, so that universal adjustment can be performed in a short time. Even if the data for acoustic correction stored in the memory is lost, the same acoustic correction can be adjusted.

[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 the embodiment of the present invention.

[Explanation of symbols]

 1 center unit (main unit) 2 DSP section (acoustic correction means) 4 speaker 8 microphone 5 audio analyzer (acoustic characteristic setting means)

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H04R 3/12 Z 7346-5H 7/00 Z 8421-5H

Claims (3)

[Claims] 1. A main body device for transmitting an audio signal obtained from a predetermined sound source and an acoustic correction command according to an operation, and an acoustic correction for applying an acoustic correction preset to the audio signal based on the acoustic correction command. Means, a speaker for generating a sound in response to a sound signal obtained from the sound correcting means, a microphone for collecting the sound generated by the speaker, and a microphone for supplying a reference sound signal to the sound correcting means. An automatic adjustment system for an audio device, comprising: an audio characteristic setting unit that analyzes a sound signal obtained from the sound source, and supplies correction setting information for setting the sound correction based on the analysis result to the sound correcting unit. 2. The automatic adjustment system for an audio apparatus according to claim 1, wherein the acoustic characteristic setting means includes a display means for displaying the analysis result and the correction setting information and a printing means for printing. 3. A reference audio signal is supplied to an audio correction means for applying an audio correction preset to the audio signal based on the audio signal and the audio correction command from the main body device, and in response to the reference audio signal. Automatic adjustment of an audio device that analyzes sound signals obtained by collecting sound generated from a speaker with a microphone, and supplies correction setting information for setting the sound correction based on the analysis result to the sound correcting means Method.