JP4355112B2 - Acoustic characteristic adjusting device and acoustic characteristic adjusting program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an acoustic characteristic adjusting device and an acoustic characteristic adjusting method, and more particularly to an acoustic characteristic adjusting device and an acoustic characteristic adjusting method for adjusting the acoustic characteristics of a plurality of acoustic generators.
[0002]
[Prior art]
It is known that making the frequency characteristics of each speaker in the multichannel constant is effective for the sound field of the multichannel speaker.
Conventionally, in order to adjust the frequency characteristics of a speaker to a reference frequency characteristic set in advance, first, a test sound is input to the speaker to be adjusted, and the sound is output. The frequency characteristics of the test sound collected by the microphone, that is, the frequency characteristics of the speaker are measured.
[0003]
Next, the measured frequency characteristic of the speaker is compared with a preset reference frequency characteristic to obtain a difference between the frequency characteristics, and an acoustic signal output corresponding to the speaker is obtained based on the obtained difference. Is adjusted with an equalizer or the like to match the frequency characteristics of the speaker with the reference frequency characteristics.
As an example of an apparatus for adjusting the frequency characteristic of such a speaker, there is a multi-channel audio reproducing apparatus disclosed in Japanese Patent Laid-Open No. 2000-354300.
[0004]
On the other hand, in Japanese Patent Application Laid-Open No. 5-175773, an acoustic reproduction apparatus that collects external noise with a microphone and corrects an acoustic signal with an equalizer so as to correspond to the collected external noise and then outputs the speaker. It is shown.
In this case, the microphone for picking up external noise, which is the standard for processing, has frequency characteristics specific to the microphone. Therefore, with this state, the frequency characteristics of the external noise collected for each microphone and each type of microphone. Will be different.
Therefore, a characteristic correction circuit for compensating the frequency characteristic of the microphone is provided at the subsequent stage of the microphone.
[0005]
[Problems to be solved by the invention]
However, in a conventional reproducing apparatus that adjusts the frequency characteristics of a speaker using a microphone, a microphone whose frequency characteristics are known in advance is used in order to match the frequency characteristics of the speaker with a reference frequency characteristic preset in the reproducing apparatus. It was premised on using.
[0006]
More specifically, a microphone whose frequency characteristic is known in advance is used, or a microphone whose frequency characteristic is known in advance is used, and further, the frequency characteristic correction circuit adjusts the frequency characteristic of the microphone so as to obtain a desired frequency characteristic. By correcting it, the frequency characteristics of the speaker are obtained based on the test sound collected by the microphone.
[0007]
Then, the obtained frequency characteristic is compared with a preset reference frequency characteristic, for example, a frequency characteristic that is flat in a predetermined frequency band, and the frequency characteristic of the speaker is matched with the reference frequency characteristic. The frequency characteristics are adjusted by a frequency adjusting device such as an equalizer.
[0008]
Since the reference frequency characteristic that becomes the reference to be matched is an absolute (not dependent on any speaker) frequency characteristic, if the frequency characteristic of the microphone that collects the sound is not known, the speaker detected by the sound collection of the microphone It is impossible to make the frequency characteristics of the reference frequency characteristics coincide with the reference frequency characteristics.
Therefore, in the conventional playback device, if the frequency characteristics of the microphone are not known in advance, the design of the playback device will be hindered.
[0009]
Even if the frequency characteristics of the microphone are known in advance, if the frequency characteristics vary from one microphone to another or the frequency characteristics vary depending on the type of microphone, etc., the frequency of the microphone for each individual microphone or each type of microphone It is necessary to correct the characteristics to obtain a desired frequency characteristic.
[0010]
Next, adjustment of the frequency characteristic of the speaker will be described with reference to FIG.
FIG. 6 is a frequency characteristic diagram showing the reference frequency characteristic and the frequency characteristic of the speaker.
In the figure, a reference frequency characteristic a which is a target frequency characteristic of a speaker is a flat frequency characteristic (a chain line in the figure) in a desired frequency band, and a frequency characteristic b is a frequency characteristic having a frequency characteristic of a microphone. It is a frequency characteristic (thin solid line in the figure) of a speaker when sound is picked up by a microphone (for example, flat frequency characteristic).
When matching the frequency characteristic b with the reference frequency characteristic a, the equalizer performs, for example, the adjustment indicated by the adjustment A that increases the gain of the low frequency band and the high frequency band.
[0011]
On the other hand, in the figure, the frequency characteristic c is the frequency characteristic of the speaker when the sound is picked up by the microphone having the frequency characteristic with the frequency characteristic of the microphone (for example, the frequency characteristic is lowered in the low frequency band and the high frequency band) ( (Dotted line in the figure).
The frequency characteristic c has a lower frequency band and a higher frequency band than the frequency characteristic b. Therefore, when the frequency characteristic c is matched with the reference frequency characteristic a, the equalizer uses a low frequency band and a high frequency band. In addition to the adjustment A that increases the gain, an adjustment B is also required.
[0012]
Here, when the microphone to be used has the frequency characteristic of the microphone with the frequency characteristic c, the microphone is fixed so as to be adjusted to the adjustment A + adjustment B by the equalizer. Then, consider a case where the frequency characteristics of the microphone vary when the adjustment A + adjustment B is fixed by the equalizer.
[0013]
In this case, the frequency characteristic of the microphone with the frequency characteristic c (the frequency characteristic drops between the low frequency band and the high frequency band) varies depending on the individual microphone, the type of the microphone, and the like. For example, the frequency of the microphone with the frequency characteristic b In the case of the microphone shown in the characteristic (flat frequency characteristic), since the equalizer performs the adjustment A + adjustment B, the equalizer is flat in the low frequency band and the high frequency band as shown by the frequency characteristic d (thick line in the figure). Adjustment C that increases the gain is performed.
Therefore, in this case, it is possible that the margin (headroom) up to the upper limit of the dynamic range is reduced, and the adjusted signal is distorted.
[0014]
As described above, a frequency correction circuit for correcting the frequency characteristics for the microphone (or software for correcting the frequency characteristics when frequency correction is performed in a DSP or the like) is essential, which increases the cost. It was.
Further, when the frequency characteristics of the microphone vary in the manufacturing process, an adjustment process for frequency correction of the frequency correction circuit is required, and there is a problem that the manufacturing cost increases.
[0015]
The present invention has been made in view of such a situation, and an object of the present invention is to provide an acoustic characteristic adjusting device and an acoustic characteristic adjusting method capable of adjusting the acoustic characteristics of a plurality of acoustic generators to substantially match. .
[0016]
[Means for Solving the Problems]
In order to achieve the above object, an acoustic characteristic adjusting device according to claim 1 of the present invention is an acoustic characteristic adjusting device that adjusts the acoustic characteristics of a plurality of acoustic generators, in order to generate test sound from the acoustic generators. A test sound output unit, a sound collection unit that collects the test sound generated from the sound generation unit, a storage unit that stores reference acoustic characteristics,Average sound obtained by averaging the respective sound characteristics obtained by collecting the test sound generated from the left and right front speakers (which is a specific sound generation unit) of the plurality of sound generation units by the sound collection unit. Storing the characteristics in the storage unit;The test sound generated from each sound generation unit that is a speaker other than the specific sound generation unit is collected by the sound collection unit, and the acoustic characteristics of the respective sound generation units other than the specific sound generation unit A control unit that calculates a difference from the reference acoustic characteristic stored in the storage unit, and based on the difference calculated by the control unit, each of the sound generation units other than the specific sound generation unit Each of the components other than the specific sound generator so that the acoustic characteristics substantially match the reference acoustic characteristics.ofAn adjustment unit for adjusting an acoustic signal output to the sound generation unit.Output the acoustic signal output of the specific sound generation unit without passing through the adjustment unitIt is characterized by that.
[0017]
According to this acoustic characteristic adjusting device, the specific acoustic generatorIsat leastLeft and rightFront speakersAverage acoustic characteristics ofIs used as a reference acoustic characteristic, so that a correction circuit for correcting the acoustic characteristic for the sound collection unit (microphone) is not necessary, and even if the sound characteristic of the sound collection unit varies, a single common sound collection unit collects the sound. Since the sound is generated, it is possible to adjust the acoustic characteristics of the acoustic generator so as to substantially match the reference acoustic characteristics without performing the adjustment corresponding to the variation. Further, without increasing the cost of adding a conventional correction circuit or the like, even if the acoustic characteristics of the sound collection unit vary, the adjustment process becomes unnecessary, and the manufacturing cost does not increase.
The characteristic sound generator is at least one of the plurality of sound generators existing in front of the listener.Left and rightFor example, there are front left, front right, and front center (center between front left and front right) sound generators in front of the listener, and rear left and rear right behind the listener. The specific sound generator is at least one of the front left, front right, and front center sound generators.Left and right speakersIt becomes. Therefore, at least in the plurality of sound generators existing in front of the listenerLeft and rightOf sound generatoraverageThe acoustic characteristics can be set as the reference acoustic characteristics, and the acoustic characteristics of the other acoustic generators can be adjusted.
[0018]
Of the present inventionClaim 2In the acoustic characteristic adjusting apparatus, the acoustic characteristic is a frequency characteristic, and the reference acoustic characteristic stored in the storage unit is a reference frequency characteristic.
[0019]
According to this acoustic characteristic adjusting device, since the frequency characteristic of the specific sound generating unit is set as the reference frequency characteristic, a frequency correction circuit for correcting the frequency characteristic for the sound collecting unit (microphone) is not necessary. Even if the frequency characteristics vary, since the sound is collected by the common sound collecting section, the frequency characteristics of the sound generating section can be adjusted without performing adjustments corresponding to variations.
Therefore, without increasing the cost of adding a conventional frequency correction circuit or the like, even if the frequency characteristics of the sound collection unit vary, the adjustment process becomes unnecessary, and the manufacturing cost does not increase.
[0020]
Of the present inventionClaim 3In the acoustic characteristic adjusting apparatus, the acoustic characteristic is a sound pressure level characteristic, and the reference acoustic characteristic stored in the storage unit is a reference sound pressure level characteristic.
[0021]
According to this acoustic characteristic adjustment device, since the sound pressure level characteristic of the specific sound generation unit is set as the reference sound pressure level characteristic, a correction circuit for correcting the sound pressure level characteristic for the sound collection unit (microphone) is not necessary, Furthermore, even if the sound pressure level characteristics of the sound collection unit vary, sound is collected by the common sound collection unit, so the sound pressure level characteristic of the sound generation unit can be adjusted without performing adjustments corresponding to variations. Can do.
Therefore, without increasing the cost of adding a conventional correction circuit or the like, even if the sound pressure level of the sound collection unit varies, the adjustment process becomes unnecessary, and the manufacturing cost does not increase.
[0028]
Of the present inventionClaim 4In the acoustic characteristic adjustment device ofAs the specific sound generatorIn addition to the left and right front speakers, including the front center speaker,
The sound collection unitThe test sound generated from the left and right front speakers and the front center speaker is collected, and the control unit calculates an average acoustic characteristic obtained by averaging the left and right front speakers and the front center acoustic characteristic.TheThe average acoustic characteristic is stored in the storage unit as a reference acoustic characteristicMake
It is characterized by that.
[0029]
According to this acoustic characteristic adjusting device, for example, when there are front left, front right, and front center sound generators in front of the listener, and there are rear left and rear right sound generators behind the listener. SaidThe specific sound generator isThe sound generators are front left and front right sound generators. Therefore, it is possible to calculate an average acoustic characteristic that is an average of the front left and front right acoustic generation units, and adjust the acoustic characteristics of the other acoustic generation units using the average acoustic characteristic as a reference acoustic characteristic.
[0030]
In the acoustic characteristic adjusting device of the present invention, the acoustic signal output to the specific sound generating unit is output without adjustment without passing through the adjusting unit.
[0031]
According to this acoustic characteristic adjustment device, since the acoustic signal output to the specific sound generation unit does not pass through the adjustment unit, the acoustic signal output to the specific sound generation unit avoids signal deterioration due to passing through the adjustment unit. be able to.
[0033]
According to the acoustic characteristic adjusting device, by adjusting the acoustic characteristic for the specific acoustic output unit, the acoustic characteristic adjusted based on the acoustic characteristic of the specific acoustic output can be obtained. The acoustic characteristics of the part can also be adjusted so as to substantially match the adjusted acoustic characteristics.
[0034]
Of the present inventionClaim 5The acoustic characteristic adjusting device is present in a vehicle, and the acoustic characteristic adjusting device adjusts the acoustic characteristic of the acoustic generator in the vehicle.
[0035]
According to this acoustic characteristic adjusting device, the acoustic characteristic of the acoustic generator in the vehicle can be made to substantially match the acoustic characteristic of the specific acoustic generator.
[0036]
In the first acoustic characteristic adjustment method of the present invention, in the acoustic characteristic adjustment method of adjusting the acoustic characteristics of a plurality of acoustic generators,
Output test sound from the sound generator to a specific sound generator of the plurality of sound generators,
Collecting the test sound generated from the specific sound generator,
Storing the acoustic characteristics of the test sound generated from the collected specific sound generator as reference acoustic characteristics;
Collecting the test sound generated only from one of the sound generators other than the specific sound generator,
Calculating the difference between the acoustic characteristics of the test sound generated from one of the acoustic generators other than the collected specific acoustic generator and the stored reference acoustic characteristics;
Based on the calculated difference, one of the sound generators other than the specific sound generator so that the acoustic characteristics of one of the sound generators substantially match the reference sound characteristics. It is characterized by adjusting the sound signal output to the sound generator.
[0037]
According to this acoustic characteristic adjustment method, since the acoustic characteristic of the specific sound generation unit is set as the reference acoustic characteristic, it is not necessary to perform correction for correcting the acoustic characteristic in the sound collection, and further, the sound characteristic of the sound collection varies. However, since the sound is collected by a common method, the acoustic characteristics of the acoustic generator can be adjusted to substantially match the reference acoustic characteristics without performing adjustments corresponding to variations.
Further, even if the acoustic characteristics of the collected sound vary without incurring man-hours such as adding a conventional correction or the like, the adjustment process is not necessary.
[0038]
In the second acoustic characteristic adjustment method of the present invention, the acoustic characteristic is a frequency characteristic,
The reference acoustic characteristic to be stored is a reference frequency characteristic.
[0039]
According to this acoustic characteristic adjustment method, since the frequency characteristic of a specific sound generation unit is set as the reference frequency characteristic, frequency correction for correcting the frequency characteristic in sound collection is not necessary, and further, the frequency characteristic of sound collection varies. However, since the sound is collected by the common method, the frequency characteristics of the sound generation unit can be adjusted without performing the adjustment corresponding to the variation.
Therefore, the adjustment process is not required even if the frequency characteristics of sound collection vary, without increasing the number of steps such as adding a conventional frequency correction.
[0040]
In the third acoustic characteristic adjustment method of the present invention, the acoustic characteristic is a sound pressure level characteristic,
The reference acoustic characteristic to be stored is a reference sound pressure level characteristic.
[0041]
According to this acoustic characteristic adjustment method, since the sound pressure level characteristic of a specific sound generator is set as the reference sound pressure level characteristic, a correction circuit for correcting the sound pressure level characteristic in sound collection is not necessary, and further, Even if the sound pressure level characteristics vary, the sound is picked up by the common method, so that the sound pressure level characteristics of the sound generating unit can be adjusted without performing the adjustment corresponding to the variation.
Therefore, the adjustment process is not required even if the sound pressure level of the collected sound varies without increasing the number of steps such as adding a conventional correction.
[0042]
In the fourth acoustic characteristic adjustment method of the present invention, the specific sound generator is any one of the plurality of sound generators.
[0043]
According to this acoustic characteristic adjustment method, the acoustic characteristic of any one acoustic generator can be used as the reference acoustic characteristic, and the acoustic characteristics of the other acoustic generators can be adjusted.
[0044]
In the fifth acoustic characteristic adjustment method of the present invention, when a plurality of the sound generation units are scattered so as to surround the listener, the one sound generation unit is a plurality of the plurality of the sound generators existing in front of the listener. It is one acoustic generator in the acoustic generator.
[0045]
According to this acoustic characteristic adjustment method, one sound generation unit is one sound generation unit among a plurality of sound generation units existing in front of the listener. For example, in front of the listener, the front left and the front right If there is a sound generator at the front center (the center between the front left and the front right) and there is a back left and a back right sound generator behind the listener, that one sound generator is the front left , The front right and the front center sound generator.
Therefore, the acoustic characteristics of one acoustic generator in the plurality of acoustic generators existing in front of the listener can be set as the reference acoustic characteristics, and the acoustic characteristics of the other acoustic generators can be adjusted.
[0046]
In the sixth acoustic characteristic adjustment method of the present invention, the specific sound generator is a plurality of sound generators less than the maximum number of the plurality of sound generators,
Obtaining the acoustic characteristics of each of the plurality of acoustic generators less than the maximum number, calculating an average acoustic characteristic that is an average of each of the acoustic characteristics,
The calculated average acoustic characteristic is stored as the reference acoustic characteristic.
[0047]
According to this acoustic characteristic adjustment method, an average acoustic characteristic, which is an average of the acoustic characteristics of each of the plurality of acoustic generators less than the maximum number, is calculated, and the average acoustic characteristic is used as a reference acoustic characteristic. The acoustic characteristics can be adjusted.
[0048]
In the seventh acoustic characteristic adjustment method of the present invention, when the plurality of sound generation units are scattered so as to surround the listener, the plurality of less than the maximum number of sound generation units exist in front of the listener. It is the sound generation part to perform.
[0049]
According to this acoustic characteristic adjustment method, the plurality of acoustic generators less than the maximum number are acoustic generators that exist in front of the listener, for example, front left, front right, and front center in front of the listener. If there is a sound generation unit and there are rear left and rear right sound generation units behind the listener, the plurality of less than the maximum number of sound generation units is any one of front left, front right, and front center It becomes the sound generation part.
Therefore, for example, when the plurality of sound generators less than the maximum number are the front left and front right sound generators, an average acoustic characteristic that is an average of the front left and front right sound generators is calculated, and this average is calculated. The acoustic characteristics of other acoustic generators can be adjusted using the acoustic characteristics as reference acoustic characteristics.
[0050]
The eighth acoustic characteristic adjustment method of the present invention is characterized in that the acoustic signal output to the specific acoustic generator is output without adjustment.
[0051]
According to this acoustic characteristic adjustment method, since the acoustic signal output to the specific sound generation unit is not adjusted, signal deterioration due to the adjustment of the acoustic signal output to the specific sound generation unit can be avoided.
[0052]
In the ninth acoustic characteristic adjustment method of the present invention, it is possible to arbitrarily adjust the acoustic signal output of the acoustic characteristic of the specific acoustic generator,
An acoustic characteristic of the test sound generated from the specific acoustic generator based on the adjusted acoustic signal output is stored as the reference acoustic characteristic.
[0053]
According to this acoustic characteristic adjustment method, it is possible to obtain an acoustic characteristic that is adjusted based on the acoustic characteristic of the specific acoustic output by adjusting the acoustic characteristic with respect to the specific acoustic output unit. The acoustic characteristics of the part can also be adjusted so as to substantially match the adjusted acoustic characteristics.
[0054]
The tenth acoustic characteristic adjustment method of the present invention is characterized in that the plurality of acoustic generators are present in a vehicle and the acoustic characteristics of the acoustic generators in the vehicle are adjusted.
[0055]
According to this acoustic characteristic adjustment method, the acoustic characteristic of the acoustic generator in the vehicle can be adjusted to substantially match the acoustic characteristic of the specific acoustic generator.
[0056]
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIGS. 1-5, the acoustic characteristic adjustment apparatus which concerns on one Embodiment of this invention is demonstrated.
FIG. 1 is a block diagram showing the system configuration of the acoustic characteristic adjusting device and the acoustic generator, FIG. 2 is a block diagram showing the configuration of the acoustic characteristic adjusting device, and FIG. 3 shows the operation for storing the reference frequency characteristic. FIG. 4 is a flowchart illustrating an operation of adjusting the frequency characteristic of the sound generation unit based on the reference frequency characteristic, and FIG. 5 is a frequency characteristic diagram illustrating the reference frequency characteristic and the frequency characteristic of the speaker.
[0057]
First, the system configuration of the acoustic characteristic adjusting device 10 and the acoustic generator and the configuration of the acoustic characteristic adjusting device 10 will be described with reference to FIGS.
First, the acoustic characteristic adjustment device 10 includes a microphone 10a that is a sound collection unit that collects sound output generated from a speaker that is a sound generation unit, and a microphone that amplifies an acoustic signal collected by the microphone 10a with a predetermined gain. The amplifier 20 includes an ADC 22 that converts an acoustic signal that is an analog signal from the microphone amplifier 20 into a digital signal, and a DSP 24.
[0058]
Furthermore, the acoustic characteristic adjusting device 10 displays a control unit 30 that controls each unit, a memory 32 that is a storage unit that stores the acoustic characteristics of a specific speaker as a reference acoustic characteristic, a control state by the control unit 30, and the like. The display unit 34, the operation unit 36 for operating the acoustic characteristic adjusting device 10 and inputting an adjustment value, the input unit 38 for inputting an external acoustic signal, and the digital signal adjusted by the DSP 24. It has DAC 40 (40a-40f) which converts the acoustic signal output of all the channels into an analog signal, and power amplifier 42 (42a-42e) which amplifies the acoustic output signal of each channel from DAC 40 into a predetermined signal. .
[0059]
The DSP 24 includes a band-pass filter (hereinafter referred to as BPF) 26 that band-passes the acoustic signal from the ADC 22, a test sound output unit 27 for generating test sounds such as white noise and pink noise from the speaker, and a speaker. It has the adjustment part 28 etc. which adjust an acoustic signal output.
In this DSP 24, the test sound is output from the test sound output unit 27 under the control of the control unit 30, the acoustic signal collected by the microphone 10a is analyzed to obtain the acoustic characteristics, and output to the control unit 30, The control unit 30 controls the adjustment unit 28 to adjust the acoustic characteristics.
[0060]
Further, the control unit 30 will be described in more detail.
First, the test sound generated from the speaker is collected by the microphone 10a, and the DSP 24 analyzes the acoustic characteristics of the speaker using the test sound collected by the microphone 10a.
When the acoustic characteristic analyzed by the DSP 24 is the acoustic characteristic of the specific speaker, the control unit 30 stores the acoustic characteristic in the memory 32 as the reference acoustic characteristic, and the acoustic characteristic analyzed by the DSP 24 is the specific acoustic characteristic. In the case of the acoustic characteristics of one speaker other than the speaker, the difference between the acoustic characteristics of this one speaker and the reference acoustic characteristics stored in the memory 32 is calculated.
Based on the calculated difference, the control unit 30 controls the adjustment unit 28 of the DSP 24 so that the acoustic characteristic of the one speaker substantially matches the reference acoustic characteristic, and the acoustic signal to the one speaker is obtained. Adjust the output.
[0061]
In the present embodiment, the acoustic characteristic adjusting device 10 will be described as an AV (audio visual) audio amplifier that acoustically drives a multi-channel speaker as an example.
[0062]
In the present embodiment, the output of the acoustic characteristic adjusting device 10 is connected to a plurality of speakers. That is, six channels (5.1 system) are arranged so as to surround the listener 7, and three channels (speakers 1 to 3) of the speakers are located in front of the listener 7 (front side). The remaining two channels (speakers 4 and 5) are arranged behind the listener 7 (rear side), and the remaining one-channel speakers 6 are arranged in other spaces.
For a more detailed example of multi-channel speaker arrangement, see, for example, ITU-R BS. It is shown in the 775-1 recommendation.
[0063]
The power amplifier 42a, which is the output stage of the acoustic characteristic adjusting device 10, is connected to the front left speaker 1, the power amplifier 42b is connected to the front right speaker 2, and the power amplifier 42c is the front center. The power amplifier 42 d is connected to the rear left speaker 4, and the power amplifier 42 e is connected to the rear right speaker 5.
In addition, the frequency band of the acoustic signal output output to the speakers 1 to 5 is a band from a low frequency range to a high frequency range that can be heard.
[0064]
Further, since the speaker 6 is a power amplifier built-in type speaker, the output of the DAC 40f of the acoustic characteristic adjusting device 10 is connected. Since the frequency band of the sound signal output to the speaker 6 is only a predetermined low frequency band, the speaker 6 is used as a so-called subwoofer.
The above is the system configuration of the acoustic characteristic adjusting device 10 and the speakers 1 to 6.
[0065]
Next, the storage of the reference acoustic characteristic in the acoustic characteristic adjustment device 10 and the operation of adjusting the acoustic characteristic of the speaker based on the stored reference acoustic characteristic will be described with reference to FIGS.
In the present embodiment, the following description will be made assuming that the acoustic characteristics are frequency characteristics.
[0066]
[Memory of reference acoustic characteristics]
The operation for storing the reference frequency characteristic will be described with reference to FIG.
As shown in FIG. 3, first, a specific speaker as a basis of the reference frequency characteristic is selected (step 10). Here, it is assumed that the two speakers 1 and 2 on the front left and right are selected.
When a specific speaker is selected, the test sound output unit 27 of the DSP 24 first outputs a signal for test sound output to the speaker 1 (step 11). The signal output from the test sound output unit 27 is converted into an analog signal by the DAC 40a, amplified by the power amplifier 42a, and output to the speaker 1.
[0067]
Since the speaker 1 acoustically generates a test sound by the signal from the power amplifier 42a, the test sound from the speaker 1 is collected by the microphone 10a (step 12). When the collected sound signal is input to the DSP 24, the center frequency of the BPF 26 is switched (step 13), and the signal level is detected with the center frequency set at 200 Hz, for example (step 14).
[0068]
In step 15, the completion of switching of the center frequency in the BPF 26 is determined. If there is a center frequency to be switched next, the process returns to step 13 to switch the center frequency and repeat a series of steps.
Here, the center frequency in the BPF 26 is sequentially switched to 400, 800, 1600, and 3200 Hz, and the switching is completed. However, the value of the center frequency in the BPF 26 is not limited to this, and may be a finer frequency step, and the upper and lower limits of the center frequency switching range may be further expanded or narrowed.
[0069]
Next, the DSP 24 obtains the frequency characteristics of the speaker 1 based on the signal level for each center frequency obtained in the step 15, and outputs the obtained frequency characteristics to the control unit 30 (step 16).
The control unit 30 temporarily stores the first frequency characteristic obtained in step 16 (step 17).
[0070]
Next, the specific speaker is switched to the speaker 2, and similarly, a series of steps 11 to 15 are performed to obtain the frequency characteristic for the speaker 2, and the control unit 30 temporarily uses the frequency characteristic as the second frequency characteristic. (Step 18).
Then, the control unit 30 calculates an average frequency characteristic which is an average frequency characteristic from the first and second frequency characteristics (step 19), and stores the calculated average frequency characteristic in the memory 32 as a reference frequency characteristic. (Step 20).
The above is the operation of storing the reference acoustic characteristics.
[0071]
[Adjustment of speaker frequency characteristics based on reference frequency characteristics]
Next, the operation of adjusting the frequency characteristic of the speaker based on the reference frequency characteristic will be described with reference to FIG.
First, a test sound signal is output to one speaker other than the speakers 1 and 2, which are specific speakers, for example, the speaker 3 (step 30). The test sound signal output from the test sound output unit 27 is converted into an analog signal by the DAC 40 c, amplified by the power amplifier 42 c, and output to the speaker 3.
[0072]
Since the speaker 3 acoustically generates a test sound by the test sound signal, the test sound from the speaker 3 is collected by the microphone 10a (step 31). When the collected acoustic signal is input to the DSP 24, the center frequency of the BPF 26 is switched to 200 Hz (step 32), and the signal level is detected (step 33).
In step 34, the completion of switching of the center frequency in the BPF 26 is determined, and if there is a center frequency to be switched next, the process returns to step 32, and the center frequency is sequentially switched to 400, 800, 1600, 3200 Hz. Repeat the steps.
[0073]
Next, the DSP 24 obtains the frequency characteristic of the speaker 3 from the signal level for each center frequency obtained in the above step, and outputs the obtained frequency characteristic to the control unit 30 (step 35).
The control unit 30 compares the frequency characteristic of the speaker 3 obtained in step 35 with the reference frequency characteristic stored in the memory 32, and calculates and obtains a difference between the frequency characteristic of the speaker 3 and the reference frequency characteristic (step 36).
[0074]
Then, based on the obtained difference, the control unit 30 controls the adjustment unit 28 to adjust the acoustic signal output to the speaker 3 so that the frequency characteristic of the speaker 3 substantially matches the reference frequency characteristic (step) 37). FIG. 5 shows an example of frequency characteristics (illustrated by dotted lines) and reference frequency characteristics (illustrated by solid lines) of the speaker 3.
The frequency characteristic of the speaker 3 can be made to substantially match the reference frequency characteristic only by performing the adjustment α that increases the gain in the low frequency band and the high frequency band by the adjustment unit 28.
[0075]
When adjusting the frequency characteristics of the other speakers 4 and 5, the process returns to step 30, and the frequency characteristics of each speaker are similarly adjusted so as to substantially match the reference frequency characteristics (step 38). .
The above is the adjustment operation of the frequency characteristic of the speaker based on the reference frequency characteristic.
[0076]
In the above embodiment, the frequency characteristic of the speaker to be adjusted is adjusted so as to substantially match the reference frequency characteristic. However, if the difference is equal to or less than a predetermined threshold value, it can be regarded as substantially matching. If the difference does not fall below the threshold even after adjustment, a notification that the difference does not fall below the threshold may be made using the display unit 34.
[0077]
Moreover, in the said embodiment, although the acoustic characteristic was demonstrated as a frequency characteristic, a sound pressure level characteristic may be sufficient. If the gain of the power amplifier 42 is constant while the efficiency and input impedance of the speakers are different, the sound pressure level changes for each speaker. Therefore, if the acoustic characteristic adjusting device of the present invention is used, the sound pressure level characteristic of the speaker can be substantially matched with the sound pressure level of a specific speaker.
[0078]
In the above-described embodiment, the specific speaker on which the reference acoustic characteristic is based is described as the left and right speakers 1 and 2 on the front. However, when the speakers 1 and 2 are speakers of the same product, the speaker 1 and the speaker 2 have little manufacturing variation, and therefore, it is considered that the variation in acoustic characteristics is also small. In that case, only one speaker 1 may be used as a specific speaker. In this case, since the process for calculating the average acoustic characteristic is not necessary, the calculation process for obtaining the reference acoustic characteristic becomes simpler.
[0079]
Moreover, in the said embodiment, although the specific speaker used as the basis of a reference | standard acoustic characteristic was demonstrated to be the speakers 1 and 2, you may add the speaker 3 of the front center. In this case, even if the acoustic characteristics of the speakers 1 to 3 vary, the average acoustic characteristic that is the average of the acoustic characteristics of the speakers can be used as the reference acoustic characteristic. The acoustic characteristics can be made uniform.
[0080]
Further, in the above embodiment, if the acoustic signal output of a specific speaker is not routed through the adjustment unit 28, signal deterioration due to the passage through the adjustment unit can be avoided. In the above embodiment, the specific speaker is described as the left and right speakers 1 and 2 on the front.
[0081]
This is because when a user configures a multi-channel speaker, all the speakers are not renewed and aligned with the same speaker, but the existing stereo speakers that have been owned so far are replaced with the front left and right speakers 1, 2. It is possible to add a predetermined number of speakers to this, and in such a case, it is effective to match the acoustic characteristics.
In other words, when the speakers 1 and 2 are existing speakers and have already been installed and set according to the user's taste, the acoustic characteristics of the speakers to be added should match the acoustic characteristics of the existing speakers as much as possible. It is effective because there is a need.
[0082]
On the other hand, in the above-described embodiment, if it is possible to adjust the acoustic characteristics of a specific speaker and set a reference acoustic characteristic based on the acoustic characteristics of the specific speaker, the specific speaker The user can adjust the acoustic characteristics.
[0083]
In the above embodiment, the acoustic characteristic adjusting device 10 has been described as an AV audio amplifier as an example, but of course, the acoustic characteristic adjusting device 10 does not have a function as an AV audio amplifier, and has an acoustic characteristic. It may be a dedicated acoustic characteristic adjustment device specialized for an adjustment device for adjusting the frequency, or conversely, an AV receiver further equipped with a tuner or the like.
[0084]
Moreover, the acoustic characteristic adjustment apparatus of the said embodiment can be utilized also about the adjustment of the acoustic characteristic with respect to the some speaker in a vehicle.
In-car speakers are the same because the speaker drive unit (unit that converts electrical signals into acoustic signals that are air vibrations) is fixed inside the car, for example, inside the door, and the inside of the door is used as the speaker enclosure. Even if it is a drive unit, if the internal structure of the door to be attached is different as in the front and rear door internal structures, the acoustic characteristics of the individual speakers will change even in the same vehicle type.
[0085]
Furthermore, even in the same door of the same vehicle type, for example, it is conceivable that the acoustic characteristics of the speaker change depending on the mounting method, for example, a lead plate for vibration suppression is attached inside the door.
Therefore, in the car, it has been difficult to match the acoustic characteristics of the speakers. However, if the acoustic characteristic adjusting device of the present invention is used, the acoustic characteristics of each speaker are substantially reduced based on the acoustic characteristics of a specific speaker. It can be made uniform.
[0086]
Further, the above-described acoustic characteristic adjustment may be achieved by using a computer that operates based on a program. The program may be transmitted through a recording medium such as a CD (compact disk) or a semiconductor memory, or via a network. Distribution and distribution are possible.
[0087]
【The invention's effect】
According to the acoustic characteristic adjusting apparatus according to the present invention, since the acoustic characteristic of the specific acoustic generation unit is set as the reference acoustic characteristic, a correction circuit for correcting the acoustic characteristic for the sound collection unit (microphone) is not necessary. Even if the acoustic characteristics of the sound collection units vary, the sound is collected by the common sound collection unit, so that the acoustic characteristics of the sound generation unit substantially match the reference acoustic characteristics without adjustment for variations. Can be adjusted.
And, without incurring cost increase such as adding a conventional correction circuit, etc., even if the acoustic characteristics of the sound collection unit vary, an acoustic characteristic adjustment device that does not increase the manufacturing cost because the adjustment process is unnecessary is provided. can do.
[0088]
Further, according to this acoustic characteristic adjusting device, since the frequency characteristic of the specific sound generating unit is set as the reference frequency characteristic, a frequency correction circuit for correcting the frequency characteristic for the sound collecting unit (microphone) is not necessary, and further, Even if the frequency characteristic of the sound part varies, the sound is collected by the common sound collecting part, so that the frequency characteristic of the sound generating part can be adjusted without performing the adjustment corresponding to the variation.
Therefore, an acoustic characteristic adjustment device that does not increase the manufacturing cost because the adjustment process is not required even if the frequency characteristics of the sound collection unit vary without incurring a cost increase such as adding a conventional frequency correction circuit. Can be provided.
[0089]
Further, according to this acoustic characteristic adjusting device, since the sound pressure level characteristic of the specific sound generating unit is set as the reference sound pressure level characteristic, a correction circuit for correcting the sound pressure level characteristic for the sound collecting unit (microphone) is necessary. Furthermore, even if the sound pressure level characteristics of the sound collection unit vary, the sound is collected by the common sound collection unit, so the sound pressure level characteristic of the sound generation unit can be adjusted without adjusting for variations. can do.
Therefore, an acoustic characteristic adjustment device that does not increase the manufacturing cost because the adjustment process is not required even if the sound pressure level of the sound collection unit varies without incurring a cost increase such as adding a conventional correction circuit or the like. Can be provided.
[0090]
In addition, according to this acoustic characteristic adjusting device, it is possible to provide an acoustic characteristic adjusting device that uses the acoustic characteristic of any one acoustic generator as a reference acoustic characteristic and adjusts the acoustic characteristics of the other acoustic generators.
[0091]
Moreover, according to this acoustic characteristic adjusting device, one acoustic generator is one acoustic generator in a plurality of acoustic generators existing in front of the listener. For example, in front of the listener, When there is a sound generation unit at the front right, the front center (the center between the front left and the front right), and when there is a sound generation unit at the rear left and the rear right behind the listener, the one sound generation unit is It is one of the sound generators at the front left, front right, and front center.
Therefore, it is possible to provide an acoustic characteristic adjusting device that uses the acoustic characteristics of one acoustic generator in a plurality of acoustic generators existing in front of the listener as reference acoustic characteristics and adjusts the acoustic characteristics of other acoustic generators. .
[0092]
Further, according to the acoustic characteristic adjusting device, an average acoustic characteristic that is an average of the acoustic characteristics of each of the plurality of acoustic generating units less than the maximum number is calculated, and other acoustic generation is performed using the average acoustic characteristic as a reference acoustic characteristic. It is possible to provide an acoustic characteristic adjusting device that adjusts the acoustic characteristics of the unit.
[0093]
Further, according to this acoustic characteristic adjusting device, the plurality of less than the maximum number of sound generating units are sound generating units existing in front of the listener, for example, in front of the listener, front left, front right, front If there is a central sound generator, and there are rear left and rear right sound generators behind the listener, a plurality of less than the maximum number of sound generators may be either front left, front right, or front center. Or a plurality of sound generators.
Therefore, for example, when the plurality of sound generators less than the maximum number are the front left and front right sound generators, an average acoustic characteristic that is an average of the front left and front right sound generators is calculated, and this average is calculated. It is possible to provide an acoustic characteristic adjusting device that adjusts the acoustic characteristics of other acoustic generators using the acoustic characteristics as reference acoustic characteristics.
[0094]
In addition, according to this acoustic characteristic adjusting device, since the acoustic signal output to the specific sound generating unit does not pass through the adjusting unit, the acoustic signal output to the specific sound generating unit does not deteriorate due to the signal passing through the adjusting unit. An acoustic characteristic adjusting device to avoid can be provided.
[0095]
Further, according to the acoustic characteristic adjusting device, by adjusting the acoustic characteristic for the specific acoustic output unit, it is possible to obtain an acoustic characteristic adjusted based on the acoustic characteristic of the specific acoustic output. It is possible to provide an acoustic characteristic adjusting device that adjusts the acoustic characteristics of the acoustic output unit so as to substantially match the adjusted acoustic characteristics.
[0096]
Moreover, according to this acoustic characteristic adjusting device, it is possible to provide an acoustic characteristic adjusting device that substantially matches the acoustic characteristic of the acoustic generating unit in the vehicle with the acoustic characteristic of the specific acoustic generating unit.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a system configuration of an acoustic characteristic adjusting device and an acoustic generator.
FIG. 2 is a block configuration diagram showing a configuration of an acoustic characteristic adjusting device.
FIG. 3 is a flowchart showing an operation of storing a reference frequency characteristic.
FIG. 4 is a flowchart showing an operation of adjusting the frequency characteristic of the sound generator based on the reference frequency characteristic.
FIG. 5 is a frequency characteristic diagram showing a reference frequency characteristic and a speaker frequency characteristic.
FIG. 6 is a frequency characteristic diagram showing a reference frequency characteristic and a speaker frequency characteristic.
[Explanation of symbols]
1 Speaker (front left)
2 Speaker (front right)
3 Speaker (front center)
4 Speaker (Rear left)
5 Speaker (Rear right)
6 Speaker (with built-in power amplifier)
7 listeners
10 Acoustic characteristic adjustment device
10a microphone
24 DSP
26 BPF
27 Test sound output section
28 Adjustment unit
30 Control unit
32 memory
34 Display section
36 Operation unit
38 Input section
40 DAC
42 Power Amplifier

Claims (7)

In an acoustic characteristic adjustment device that adjusts the acoustic characteristics of a plurality of acoustic generators,
A test sound output unit for generating a test sound from the sound generation unit;
A sound collection unit for collecting the test sound generated from the sound generation unit;
A storage unit for storing reference acoustic characteristics;
Of the plurality of sound generation units, an average sound characteristic obtained by averaging the respective sound characteristics obtained by collecting the test sound generated from the left and right front speakers as a specific sound generation unit by the sound collection unit Is stored in the storage unit, and the test sound generated from each sound generation unit that is a speaker other than the specific sound generation unit is collected by the sound pickup unit, and each of the test sounds other than the specific sound generation unit is collected. A controller that calculates a difference between the acoustic characteristics of the acoustic generator and the reference acoustic characteristics stored in the storage;
Based on the difference calculated by the control unit, other than the specific sound generation unit such that the acoustic characteristics of the sound generation units other than the specific sound generation unit substantially match the reference acoustic characteristics. An acoustic characteristic adjustment apparatus comprising: an adjustment unit that adjusts an acoustic signal output to each of the acoustic generation units, and outputting an acoustic signal output of the specific acoustic generation unit without passing through the adjustment unit. The acoustic characteristic is a frequency characteristic,
The acoustic characteristic adjusting apparatus according to claim 1, wherein the reference acoustic characteristic stored in the storage unit is a reference frequency characteristic. The acoustic characteristic is a sound pressure level characteristic,
The acoustic characteristic adjusting apparatus according to claim 1, wherein the reference acoustic characteristic stored in the storage unit is a reference sound pressure level characteristic. In addition to the left and right front speakers as the specific sound generator, further including a front center speaker,
The sound collection unit collects the test sound generated from the left and right front speakers and the front center speaker,
The control unit calculates an average acoustic characteristic obtained by averaging acoustic characteristics of the left and right front speakers and the front center, and stores the average acoustic characteristic in the storage unit as the reference acoustic characteristic. The acoustic characteristic adjustment apparatus of any one of 1-3. The acoustic characteristic adjustment device is present in the vehicle, acoustic according to any one of claims 1 to 4, characterized in that adjusting the acoustic characteristics of the sound generating unit in the vehicle by the acoustic characteristic adjustment device Characteristic adjustment device. In an acoustic characteristic adjustment program for adjusting the acoustic characteristics of a plurality of acoustic generators,
Test sound is output to the left and right front speakers, which are specific sound generators among the plurality of sound generators,
The test sound generated from the specific sound generation unit is collected by a sound collection unit,
An average acoustic characteristic that is an average of the acoustic characteristics of the test sound generated from the collected specific acoustic generator is stored in the storage unit as a reference acoustic characteristic,
Collecting the test sound generated from each of the sound generators that are speakers other than the specific sound generator,
Calculating the difference between the acoustic characteristics in the test sound generated from each of the acoustic generators other than the collected specific acoustic generator, and the stored reference acoustic characteristics;
Based on the calculated difference, each of the sound other than the specific sound generation unit so that the acoustic characteristics of the sound generation units other than the specific sound generation unit substantially match the reference sound characteristics. Adjust the acoustic signal output to the generator,
An acoustic characteristic adjustment program for outputting an acoustic signal output of the specific sound generation unit without passing through the adjustment unit. The acoustic characteristic adjustment program according to claim 6 , wherein the specific sound generation unit includes a front center speaker in addition to the left and right front speakers.

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