JP2000137489A - On-vehicle audio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable performing optimum volume compensation for various different acoustic input by reading a detected noise level and compensation quantity corresponding to a kind of a discriminated acoustic input source from a noise data control database, and compensating an acoustic input signal. SOLUTION: On DSP side, noise level is detected (S11), and the noise level data are transmitted to a microcomputer side (S12). correction data corresponding to a kind (for each sound range) of an input source and a noise step are received (S13), and an acoustic input signal is arithmetically processed with compensation quantity corresponding to the correction data (S14). The corrected acoustic signal is outputted to an electronic volume (S15). On microcomputer side, the kind of input source is confirmed (S21), and the noise level is received and is assigned to an appropriate step (S22). Correction quantity corresponding to the kind of noise level and the noise step are read out from a correction table (S23), and the corrected data corresponding to the kind on input source and the noise step are transmitted to the DSP (S24).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle acoustic device capable of controlling an optimum sound volume in accordance with the noise in a vehicle.

[0002]

2. Description of the Related Art In an on-vehicle acoustic device, even when the sound volume is adjusted to an optimum level while the vehicle is stopped, road friction noise,
The sound output is masked due to noise such as wind noise, making it difficult to hear. Therefore, a method has been adopted in which a microphone for detecting noise is installed, and control is performed so as to increase the volume according to the level of the noise.

FIG. 11 is a diagram for explaining a conventional noise correction method for an on-vehicle acoustic device. FIG.
(B) is a diagram showing the relationship between the noise level and the correction amount. Hereinafter, description will be made with reference to the drawings.

[0004] Reference numeral 1 denotes an FM tuner 1 for receiving an FM broadcast.
1, an AM tuner 12 for receiving an AM broadcast, a CD player 13 for playing a CD disk, a cassette player 14 for playing a cassette tape, etc., and an audio source input for outputting a signal of an audio source selected from these audio sources Department. Reference numeral 2 denotes a sound input signal from the sound input unit 1 (an analog signal is converted from analog to digital). DS that corrects the sound input signal according to the noise level detected by
P (Digital Signal Process)
r). Reference numeral 3 denotes an electronic volume for attenuating a sound input signal at a set attenuation rate (according to a control signal to a control terminal) to adjust the volume. Reference numeral 4 denotes an amplifier for amplifying the power of the audio signal corrected by the DSP 2 so that the audio signal can be reproduced. Reference numeral 5 denotes a speaker that converts an acoustic signal whose power has been amplified by the amplifier 4 into sound. Reference numeral 6 denotes a microcomputer that controls the volume of the sound input source 1 according to the noise level detected by the microphone 7. Reference numeral 7 denotes a microphone that is installed in the vehicle and detects a noise level. Reference numeral 9 denotes an operation volume for adjusting to an optimum volume set by the user.

Next, a noise correction method will be described. Increase in noise due to running of the vehicle (absolute value of noise or amount of increase based on noise when vehicle is stopped)
Is detected by the microphone 7. The microcomputer 6 reads the correction amount based on the relationship between the noise level and the correction amount shown in FIG. 11B stored in advance in a memory in the microcomputer 6 according to the detected noise level. And electronic volume 3
Is instructed to increase the sound volume by the correction amount corresponding to the noise level. As a result, even if there is noise, the occupant becomes easier to hear due to the increased sound output. In consideration of the frequency distribution of the noise, the acoustic input signal is not divided into the entire frequency range (entire sound range) but per frequency, for example, the whole sound range (entire audible range), the high sound range (2 to 3 kHz or more), the low sound range ( 12
Further effects can be exhibited by changing the correction amount every time (0 Hz or less). In this case, the microcomputer 6 sends the correction amount for each sound range to the DSP 2 that controls the sound field, and the DSP 2 corrects the sound input signal and outputs the signal to the electronic volume 3.

[0006]

In a conventional on-vehicle acoustic device, an acoustic input signal is uniformly corrected in accordance with the level of a noise level. Even if the correction amount is optimal for a high CD, a sufficient effect cannot be obtained with the same correction amount for a cassette tape having a low recording level. In addition, even if the correction amount is optimal for a low volume due to the difference in volume position for adjusting the volume, the volume is further increased by being corrected for a high volume, so that not only is it noisy but also the sound output is There is a problem that distortion occurs.

As described above, in the conventional noise correction method, differences in the types of sound input sources having different recording levels and reproduction levels, differences in sound input signal levels, differences in volume positions for adjusting sound volume, differences in sound frequency distribution, and the like. Could not be completely corrected.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an on-vehicle acoustic device capable of performing optimal volume correction for various different acoustic inputs when noise increases.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an on-vehicle acoustic device for correcting the level of an acoustic input signal in accordance with the noise level in a vehicle and outputting the corrected level. A noise level detecting means, a determining means for determining a type of the sound input source, and a first correction amount for correcting the sound input signal according to the type of the sound input source and the noise level. A noise correction database, a noise level detected by the noise level detection means, and a correction amount corresponding to the type of the sound input source determined by the determination means are read from the first noise correction database. It is characterized by comprising a correction means for correcting a signal.

In the first noise correction database, a correction amount is recorded for each of a plurality of sound ranges having different frequency bands of the acoustic signal, and the correction unit detects the correction amount by the noise level detection unit. A correction amount corresponding to each of a plurality of sound ranges having different frequency bands of the audio signal is read from the first noise correction database in accordance with the noise level and the type of the audio input source determined by the determination unit. It is characterized in that the input signal is corrected for each sound range.

Also, in a vehicle-mounted audio apparatus for correcting and outputting the level of an audio input signal in accordance with the noise level in the vehicle, a noise level detecting means for detecting the noise level in the vehicle, and a volume for adjusting the volume of the audio output. A volume position detecting means for detecting the operation position of the volume, and a correction amount to be corrected for the audio input signal according to the operation position of the volume for adjusting the volume of the sound output and the noise level. A noise correction database, a noise level detected by the noise level detection means, and a correction amount corresponding to an operation position of the volume detected by the volume position detection means are read from the second noise correction database, and the sound input is performed. It is characterized by comprising a correction means for correcting a signal.

Also, in a vehicle-mounted acoustic apparatus for correcting and outputting the level of an audio input signal according to the noise level in a vehicle, a signal level detecting means for detecting the level of the audio input signal; A third noise correction database in which a volume position to be corrected for the volume of the volume for adjusting the volume of the sound output is recorded, and a volume position corresponding to the level of the sound input signal detected by the signal level detection means. The apparatus further comprises a correction unit that reads from the third noise correction database and corrects a position of a volume for adjusting a volume of the sound output.

An electronic volume for attenuating the audio input signal at a predetermined attenuation rate to adjust the volume is provided, and the correction means is configured to provide a different correction amount for each type of the audio input source. Is changed to change the correction.

Further, in an on-vehicle acoustic device for correcting and outputting the level of an acoustic input signal in accordance with the noise level in the vehicle, a noise level detecting means for detecting the noise level in the vehicle and the type of the acoustic input source are determined. Discriminating means, a fourth noise correction database in which a correction amount to be corrected for the sound input signal is recorded according to the noise level, and according to the type of the sound input source discriminated by the discriminating means, Correction means for correcting the noise level detected by the noise level detection means, and correction for reading the correction amount corresponding to the noise level corrected by the correction means from the fourth noise correction database and correcting the sound input signal It is characterized by having means.

Further, in a vehicle-mounted acoustic device for correcting and outputting the level of an acoustic input signal in accordance with the noise level in the vehicle, a noise level detecting means for detecting the noise level in the vehicle and a type of the acoustic input source are determined. Discriminating means, volume position detecting means for detecting the operation position of the volume for adjusting the volume of the sound output, signal level detecting means for detecting the level of the sound input signal, and adjusting the type of the sound input source and the sound output volume Depending on the operation position of the volume to be set, any combination of the level of the sound input signal and the noise level,
A noise correction database in which a correction amount to be corrected for the sound input signal and a correction position of the volume are recorded, a type of the sound input source determined by the determination unit, and a volume of the volume detected by the volume position detection unit. A correction unit that reads a correction amount and a volume correction position corresponding to the combination of the operation position and the level of the audio input signal detected by the signal level detection unit from the noise correction database, and corrects the audio input signal. It is characterized by the following.

[0016]

FIG. 1 is a block diagram showing the configuration of a vehicle-mounted acoustic device according to a first embodiment of the present invention. Hereinafter, description will be made with reference to the drawings.

Reference numeral 1 denotes an FM tuner 1 for receiving an FM broadcast.
1. An AM tuner 12 for receiving an AM broadcast, a CD player 13 for playing a CD disk, a cassette player 14 for playing a cassette tape, etc., and an audio source input for outputting a signal of an audio source selected from these audio sources. Department. Reference numeral 2 denotes a sound input signal from the sound input unit 1 (an analog signal is converted from analog to digital). DS that corrects the sound input signal according to the noise level detected by
P (Digital Signal Process)
r). Reference numeral 3 denotes an electronic volume for attenuating a sound input signal at a set attenuation rate (in response to a control signal to a control terminal) to adjust the volume. Reference numeral 4 denotes an amplifier for power-amplifying the audio signal corrected by the DSP 2 so that the audio signal can be reproduced. Reference numeral 5 denotes a loudspeaker for converting an audio signal amplified by the amplifier 4 into sound. Reference numeral 6 denotes a microcomputer that controls the volume of the sound input source 1 according to the noise level detected by the microphone 7. Reference numeral 7 denotes a microphone that is installed in the vehicle and detects a noise level. Reference numeral 8 denotes a noise correction database including a plurality of correction tables storing the type of the sound input unit 1, the set volume position, the sound input signal level, and the correction amount to be corrected for each sound input range based on the output from the microphone 7. is there. Reference numeral 9 denotes an operation volume for adjusting to an optimum volume set by the user.

FIGS. 2A and 2B are diagrams for explaining the stepping of noise. FIG. 2A shows a noise level, and FIG. 2B shows a noise step. FIGS. 3A and 3B are flowcharts of the correction processing of the on-vehicle acoustic device according to the first embodiment of the present invention. FIG. 3A shows the processing on the DSP 2 side, and FIG. 3B shows the processing on the microcomputer 6 side. FIG. 4 is a correction table A of the on-vehicle acoustic device according to the first embodiment of the present invention. Hereinafter, the noise correction processing will be described. In this example, the volume correction by increasing the noise level is performed based on the type of input source and the sound range (entire sound range, high sound range, low sound range).
This processing is started when the power supply of the on-vehicle acoustic device is turned on.

First, the processing on the DSP 2 side will be described.
In step S11, the noise level is detected and the process proceeds to step S11.
Move to 12. That is, the noise level in the vehicle is detected by the microphone 7, and the acoustic output output from the speaker 5 included in the noise is removed to calculate only the pure noise. For this purpose, the output of the microphone 7 is separated from the speaker output through a filter (a filter for subtracting an acoustic signal from the signal of the microphone 7). It is assumed that the detected noise level is, for example, -32 dB. In step S12, the noise level data (-32 dB) is transmitted to the microcomputer 6, and the process proceeds to step S13. That is, the noise level data is transmitted to the microcomputer 6 to read out the correction amount corresponding to the type of the input source and the noise level (noise step) from the noise correction database (correction table A) 8.

In step S13, the type of input source (for each sound range) and the correction data corresponding to the noise step are received, and the flow advances to step S14. The correction corresponding to the type of input source (FM tuner 11) and the noise step (step 4) to be corrected to the sound input signal is +7 dB in the whole range and + in the low range.
9 dB, and +8 dB in the high frequency range.

In step S14, the acoustic input signal is arithmetically processed with the type of input source and the amount of correction corresponding to the noise step, and the flow advances to step S15. That is, the received sound input signal is corrected (added) by +7 dB in the whole sound range, +9 dB in the low sound range, and +8 dB in the high sound range. In step S15, the corrected sound signal is output to the electronic volume 3, and the process returns to step S11, and the same processing is repeated.

Next, the processing on the microcomputer 6 side will be described. In step S21, the type of the input source is confirmed, and the process proceeds to step S22. That is, it is determined which input source (FM tuner 11 to cassette player 14) is selected from the state of the selection switch of the input source selected by the user (here, it is assumed that the FM tuner 11 is selected). . In step S22, the noise level data is received, and the process proceeds to step S23. In other words, the received noise (pure noise) level due to the running of the vehicle changes as shown in FIG. 2A, and a predetermined threshold level (FIG. 2) is used to associate this noise level with a correction table (noise correction database). In FIG. 2, it is divided into a plurality of steps (for example, four steps in FIG. 2) as shown in FIG. Thereafter, the sound input signal is corrected by reading the correction amount from the correction table corresponding to the noise step changing with time. In this example, the noise level dB value is stepped at equal intervals. However, the present invention is not limited to this, and the noise level may be stepped at different noise level values or different noise level intervals for each type of input source (fourth). This will be described in detail in the embodiment). In the present embodiment, the noise level is set to 0 dB for the A / D full bit output in digital processing.

In step S23, the type of input source and the amount of correction corresponding to the noise step are read from the correction table A, and the flow advances to step S24. That is, the correction values corresponding to the FM tuner and the noise step 4 are stored in the correction table A shown in FIG.
Read from The correction amount to be increased is +7 dB in the whole range (all audible range), and +9 dB in the low range (about 120 Hz or less).
B, +8 dB in a high frequency range (2 to 3 kHz or more). The correction amount is set large for an input source having a low recording level and a low reproduction level, and is set to be larger as the noise step becomes larger. Note that this value is the highest reproduction level of C
It is based on the noise step 1 of the D player.

In step S24, the correction data corresponding to the type of the input source and the noise step is transmitted to the DSP 2, and the process returns to step S21. That is, the correction data corresponding to the type of the input source (+7 dB in the whole range, +9 dB in the low range,
(+8 dB in the high frequency range) is transmitted to the DSP 2 side.

As described above, in this embodiment, the volume is appropriately increased according to the noise level detected by the microphone and the type of the input source, so that it is easier to hear as compared with the case where the volume is corrected only in response to the noise level. it can.

In this embodiment, the DSP 2 corrects the audio input signal. However, the correction amount of the entire range corresponding to the type of input source (in this case, +1 dB in the entire range of the FM tuner) is calculated by the microcomputer. 6 may be transmitted directly to the electronic volume 3 to change the volume position.
In this case, the whole-range correction data transmitted to the DSP 2 side is +6 dB, the low-range correction data is +8 dB, and the high-range correction data is +7 dB. As described above, the DSP 2 that performs the arithmetic processing and the microcomputer 6 that performs the control share the processing with the DSP 2.
It can be changed depending on the performance of the microcomputer 6 and the like.

FIG. 5 is a flowchart of a correction process for a vehicle-mounted acoustic device according to a second embodiment of the present invention.
(B) is a process on the microcomputer 6 side. FIG. 6 shows a correction table B of the vehicle-mounted acoustic device according to the second embodiment of the present invention. Hereinafter, the noise correction processing will be described. still,
In this example, the sound volume correction based on the increase in the noise level is performed based on the volume position for setting the sound volume. This processing is started when the power supply of the on-vehicle acoustic device is turned on.

First, the processing on the DSP 2 side will be described.
In step S31, the noise level is detected, and
Move to 32. That is, the noise level in the vehicle is detected by the microphone 7, and the acoustic output output from the speaker 5 included in the noise is removed to calculate only the pure noise. still,
It is assumed that the detected noise level is, for example, -32 dB. In step S32, the noise level data (−32d
B) is transmitted to the microcomputer 6 side, and the routine goes to Step S33.
That is, the noise level data is transmitted to the microcomputer 6 to read out the correction amount corresponding to the volume position and the noise level (noise step) from the noise correction database (correction table B) 8.

In step S33, the correction data corresponding to the volume position and the noise step is received, and step S33 is executed.
Move to 34. The volume position (-6 dB) to be corrected for the sound input signal and the correction corresponding to the noise step (step 4) are +4 dB.

In step S34, the sound input signal is arithmetically processed with the correction amount corresponding to the volume position and the noise step, and the flow advances to step S35. That is, a correction (+4 dB) corresponding to the volume position and the noise step to be corrected for the audio input signal is performed. In step S35, the corrected sound signal is output to the electronic volume 3 and the process returns to step S31, and the same processing is repeated.

Next, processing on the microcomputer 6 side will be described. In step S41, the volume position is confirmed, and the routine goes to step S42. That is, the volume position set by the user is confirmed (here, the volume position is assumed to be -6 dB). The volume position is set to 0 dB when the volume is set to be maximum. In step S42, the noise level data is received, and the process is turned into a step, and the process proceeds to step S43 (hereinafter referred to as noise step 4).

In step S43, a correction amount corresponding to the volume position and the noise step is read from the correction table B, and the flow advances to step S44. That is, the correction value corresponding to the volume position -6 dB and the noise step 4 is read from the correction table B in FIG. The correction amount to be increased is + 4d
B. Since the masking effect increases as the noise increases, it is natural that the correction amount is increased. However, the masking effect is the volume position (volume) set by the user.
The amount of correction according to the noise step is shown in FIG.
As described above, the output signal is not uniformly increased in accordance with the noise level (step), but the correction amount is large in a low volume range (volume position on the -18 dB side), and is increased in a high volume range (volume position on the 0 dB side). It is set small to prevent sound distortion due to an increase in volume. For example, when the noise level is step 4 and the volume position is -18 dB, it is +8 d.
B, +6 dB when the volume position is -12 dB, +4 dB when the volume position is -6 dB, and the volume position is-
At 0 dB, the volume is increased by +2 dB.

In step S44, correction data corresponding to the volume position and the noise step is transmitted to the DSP 2, and the process returns to step S21. That is, the correction data (+4 dB) corresponding to the volume position is transmitted to the DSP 2 side.

As described above, in this embodiment, the sound volume is appropriately increased in accordance with the noise level detected by the microphone and the volume position, so that the sound distortion is reduced as compared with the case where the sound volume is corrected only in response to the noise level. It is easy to hear without.

FIG. 7 is a flowchart of a correction process for a vehicle-mounted acoustic device according to a third embodiment of the present invention.
(B) is a process on the microcomputer 6 side. FIG. 8 is a correction table C of the vehicle-mounted acoustic device according to the third embodiment of the present invention. Hereinafter, the noise correction processing will be described. still,
In this example, the sound volume is corrected by increasing the noise level based on the input signal level. This processing is started when the power supply of the on-vehicle acoustic device is turned on.

First, the processing on the DSP 2 side will be described.
In step S51, the input signal level is detected, and the routine goes to step S52. That is, the level of the input signal received from the input source (for example, the FM tuner 11) is detected. still,
It is assumed that the detected input signal level is, for example, −15 dB. In the step S52, the input signal level data (−15B) is transmitted to the microcomputer 6 and the step S51 is performed.
And the same processing is repeated. That is, input signal level data is transmitted to the microcomputer 6 in order to read a correction amount corresponding to the input signal level from the noise correction database (correction table C) 8.

Next, the processing on the microcomputer 6 side will be described. In step S61, the input signal level is received, and the flow proceeds to step S62. In step S62, the volume position corresponding to the input level division is read from the correction table C, and the process proceeds to step S63. That is, in the correction table C of FIG. 8, the input signal level is −15 dB (−10 dB to −10 dB).
The volume position B corresponding to (−20 dB) is read.
In step S63, the correction data corresponding to the input signal level is output to the electronic volume 3, and the process returns to step S61. That is, the output signal is limited so that the upper limit of the volume position is the position B. The volume position A is a position where the volume is high, and the volume position D is a position where the volume is low.

As described above, in this embodiment, as compared with the case where the volume is corrected only in response to the noise level, the output can be limited so that the volume does not become too large for a large input signal, and the sound distortion can be suppressed. It is easy to hear without.

FIG. 7 is a flowchart of a correction process for a vehicle-mounted acoustic device according to a fourth embodiment of the present invention.
(B) is a process on the microcomputer 6 side. FIG. 8 shows a correction table D of the vehicle-mounted acoustic device according to the fourth embodiment of the present invention. Hereinafter, the noise correction processing will be described. still,
In this example, the sound volume correction by increasing the noise level is performed based on the type of input source. Instead of changing the correction amount for each type of input source as in the first embodiment, the noise level is stepped. The threshold level at the time is changed for each type of input source (corresponding to correction means for correcting the noise level for each type of sound input source). This processing is started when the power supply of the on-vehicle acoustic device is turned on.

First, the processing on the DSP 2 side will be described.
In step S71, the noise level is detected, and step S71 is performed.
Move on to 72. That is, the noise level in the vehicle is detected by the microphone 7, and the acoustic output output from the speaker 5 included in the noise is removed to calculate only the pure noise. still,
It is assumed that the detected noise level is, for example, -44 dB. In step S72, the noise level data (-44d
B) is transmitted to the microcomputer 6 side, and the routine goes to Step S73.
That is, the noise level data is transmitted to the microcomputer 6 to read out the correction amount corresponding to the type of the input source and the noise level (noise step) from the noise correction database (correction table D) 8.

In step S73, correction data corresponding to the noise step is received, and the flow advances to step S74. The correction corresponding to the noise step (step 4) to be corrected to the audio input signal is +3 dB.

In step S74, the sound input signal is subjected to arithmetic processing with the correction amount corresponding to the noise step, and step S7 is performed.
Move to 5. That is, a correction +3 dB corresponding to the noise step to be corrected for the audio input signal is performed. In step S75, the corrected sound signal is output to the electronic volume 3, and the process returns to step S71, and the same processing is repeated.

Next, the processing on the microcomputer 6 side will be described. In step S81, the type of the input source is confirmed, and the process proceeds to step S82. That is, it is determined which input source (FM tuner 11 to cassette player 14) is selected from the state of the selection switch of the input source selected by the user (here, it is assumed that the FM tuner 11 is selected). . In step S82, the noise level data is received, and the process proceeds to step S83. That is, in order to make the received noise level correspond to the correction table (the noise correction database), the noise level is divided into a plurality of steps by the threshold level corresponding to the type of the input source shown in FIG. Thereafter, the sound input signal is corrected by reading the correction amount from the correction table corresponding to the noise step changing with time.

In step S83, a correction amount corresponding to the noise step is read out from the correction table D, and is read in step S83.
Move to 84. That is, the correction value corresponding to the noise step 4 is read from the correction table D in FIG. The correction amount to be increased is +3 dB. The correction amount is constant corresponding to the noise step.

In step S84, the correction data corresponding to the noise step is transmitted to the DSP 2 side, and the process proceeds to step S81.
Return to That is, the correction data +3 dB is transmitted to the DSP 2 side.

As described above, in the present embodiment, the sound volume is appropriately increased according to the noise level detected by the microphone and the type of the input source, so that it is easier to hear compared to the case where the sound volume is corrected only in response to the noise level. it can. In addition, by changing the threshold level when the noise is stepped, the table showing the relationship between the noise step and the noise correction amount can be made common regardless of the type of the sound input source.

[0047]

As described above, according to the present invention, it is possible to provide an on-vehicle acoustic device capable of automatically controlling a sound volume to an optimum level in response to noise caused by running of a vehicle.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a vehicle-mounted acoustic device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating stepping of noise.

FIG. 3 is a flowchart of a correction process of the vehicle-mounted acoustic device according to the first embodiment of the present invention.

FIG. 4 is a correction table A of the on-vehicle acoustic device according to the first embodiment of the present invention.

FIG. 5 is a flowchart of a correction process of the vehicle-mounted acoustic device according to the second embodiment of the present invention.

FIG. 6 is a correction table B of the vehicle-mounted acoustic device according to the second embodiment of the present invention.

FIG. 7 is a flowchart of a correction process of the vehicle-mounted acoustic device according to the third embodiment of the present invention.

FIG. 8 is a correction table C of the vehicle-mounted acoustic device according to the third embodiment of the present invention.

FIG. 9 is a flowchart of a correction process of the vehicle-mounted acoustic device according to the fourth embodiment of the present invention.

FIG. 10 is a correction table D of the vehicle-mounted acoustic device according to the fourth embodiment of the present invention.

FIG. 11 is a diagram for explaining a conventional noise correction method for a vehicle-mounted acoustic device.

[Explanation of symbols]

1... Acoustic input source 4... Amplifier 11. FM tuner 5.
..Speaker, 12 AM tuner,
6 ··· · microcomputer, 13 · · · CD player,
7... Microphone, 14... Cassette player, 8... Noise correction database, 2... DSP, 9.
..Operation volume, 3 ... electronic volume.

Claims (7)

[Claims] 1. An in-vehicle acoustic device for correcting and outputting a level of an acoustic input signal according to a noise level in a vehicle, a noise level detecting means for detecting a noise level in the vehicle, and determining a type of a sound input source. Discriminating means, a first noise correction database in which a correction amount to be corrected for the sound input signal is recorded in accordance with the type of the sound input source and the noise level, and the first noise correction database is detected by the sound level detecting means. A vehicle comprising: a noise level and a correction amount corresponding to the type of the sound input source determined by the determination means are read from the first noise correction database to correct the sound input signal. For sound equipment. 2. The first noise correction database includes:
A correction amount is recorded for each of a plurality of sound ranges having different frequency bands of the audio signal, and the correction unit includes a noise level detected by the noise level detection unit and a sound input source determined by the determination unit. According to a type, a correction amount corresponding to each of a plurality of sound ranges having different frequency bands of the sound signal is read from the first noise correction database, and the sound input signal is corrected for each sound range. The on-vehicle acoustic device according to claim 1. 3. An in-vehicle acoustic device for correcting and outputting a level of an audio input signal according to an in-vehicle noise level, a noise level detecting means for detecting an in-vehicle noise level, and a volume for adjusting a volume of the acoustic output. A volume position detecting means for detecting the operation position of the volume, and a correction amount to be corrected for the audio input signal according to the operation position of the volume for adjusting the volume of the sound output and the noise level. A noise correction database, a noise level detected by the noise level detection means, and a correction amount corresponding to an operation position of the volume detected by the volume position detection means are read from the second noise correction database, and the sound input is performed. An on-vehicle acoustic device comprising a correction means for correcting a signal. 4. An in-vehicle acoustic device for correcting and outputting a level of an acoustic input signal according to a noise level in a vehicle, a signal level detecting means for detecting a level of the acoustic input signal, and a level corresponding to the level of the acoustic input signal. A third noise correction database in which a volume position at which the volume of the volume for adjusting the volume of the sound output is to be corrected is recorded, and a volume position corresponding to the level of the sound input signal detected by the signal level detection means. An on-vehicle acoustic device comprising: a correcting unit that reads from the third noise correction database and corrects a position of a volume for adjusting a volume of the acoustic output. 5. An electronic volume for attenuating an audio input signal at a predetermined attenuation rate to adjust a sound volume, wherein the correction means adjusts a correction amount different for each type of the audio input source by changing a position of the electronic volume. 2. The on-vehicle acoustic device according to claim 1, wherein the correction is made by changing the following. 6. An on-vehicle acoustic device for correcting the level of an acoustic input signal according to the noise level in a vehicle and outputting the corrected level, wherein a noise level detecting means for detecting the noise level in the vehicle and a type of the acoustic input source are determined. Determining means, a fourth noise correction database in which a correction amount to be corrected for the audio input signal is recorded according to the noise level, and according to the type of the sound input source determined by the determining means, Correcting means for correcting the noise level detected by the noise level detecting means; reading a correction amount corresponding to the noise level corrected by the correcting means from the fourth noise correction database;
An on-vehicle acoustic device, comprising: a correcting unit that corrects the acoustic input signal. 7. An in-vehicle acoustic device for correcting and outputting a level of an acoustic input signal according to a noise level in a vehicle, a noise level detecting means for detecting a noise level in the vehicle, and determining a type of the acoustic input source. Discriminating means, volume position detecting means for detecting the operation position of the volume for adjusting the volume of the sound output, signal level detecting means for detecting the level of the sound input signal, and adjusting the type of the sound input source and the sound output volume A noise correction database in which a correction amount to be corrected for the sound input signal and a correction position of the volume are recorded according to an operation position of the volume to be performed, an arbitrary combination of the level of the sound input signal, and the noise level; The type of the sound input source determined by the determination means, the operation position of the volume detected by the volume position detection means, the signal level A correction unit that reads a correction amount and a volume correction position corresponding to the combination of the levels of the sound input signals detected by the sound detection unit from the noise correction database, and corrects the sound input signal. In-vehicle acoustic device.