JPH11268593A - Automatic adjustment device for on-vehicle audio system and occupant position recognizing device in cabin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enjoy reproduced sound having presence by detecting the voice of a user in a cabin by a microphone disposed in several places in the cabin, operating the position of the user from a time difference of the detection signals, and correcting on the time axis of reproduction signals for each speaker according to the position. SOLUTION: Plural reproduction signals from a reproducing part 11 are generated as sound from speakers 21L-24R through an adjusting device 12 and an amplifier 13. When a user sitting on a seat S generates a voice for adjustment at this time, the voice is collected in microphones 31-33, and detection signals are input to a signal processing part 40 to detect a time difference of the detection signals by the microphones 31, 32 from the detection signal by the microphone 33. The time difference is multiplied by the acoustic velocity to find the distance difference between the user position and the positions of the microphones 31-33. Subsequently, by the adjusting device 12, correction on the time axis of each reproduction signal is made according to the user position, whereby the sound from the speakers 21L-24R can simultaneously reach the user.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic adjustment device for performing sound adjustment in a vehicle-mounted audio device having a plurality of speakers, and a device for recognizing a position of a passenger in a vehicle.

[0002]

2. Description of the Related Art Conventionally, an on-vehicle acoustic device is used to generate a reproduction signal from a cassette tape player, a compact disc (CD: registered trademark) player, a mini disc (MD: registered trademark) player, an FM-AM tuner, or the like. A reproducing unit, an adjusting unit that performs acoustic adjustment on the reproduced signal generated by the reproducing unit, an amplifying unit that amplifies the reproduced signal that is acoustically adjusted by the adjusting unit, and converting the reproduced signal amplified by the amplifying unit into audio. Speaker.

Here, the speakers are arranged at least on the left and right in the interior of the vehicle for stereo reproduction. For example, as shown in FIG. 4, a plurality (eight in this example) of speakers 21L, 21R, 22L are provided. , 22R, 23L, 23R, 2
4L and 24R are provided at a plurality of symmetrical locations (eight in this example). In such a configuration, sound is generated from each of the speakers 21L to 24R by inputting a plurality of playback signals from the playback unit to the speakers 21L to 24R via the adjustment unit and the amplification unit. ing.

[0004]

However, since the interior of an automobile in which such an on-vehicle acoustic device is installed is narrow, the degree of freedom in the arrangement of each of the speakers 21L to 24R and the seat S is reduced. It is practically impossible for a user sitting at a location to listen to a sound at an intermediate position between the left and right speakers 21L and 21R, for example. For this reason, the adjustment unit corrects the reproduction signal for each of the speakers 21L to 24R on the time axis so that each of the speakers 21L to 21R is corrected.
The sound from 24R reaches the user sitting on the seat S at the same time.

As a result, the user sitting on the seat S can listen to the sound from each of the speakers 21L to 24R without a time difference, and hear the same sound as in the case where the speaker is located at an intermediate position between the speakers 21L to 24R. be able to. However, the correction on the time axis of each reproduction signal in the adjustment unit described above is performed by a user sitting on the seat S.
Since it is manually performed while listening to the sounds from the speakers 21L to 24R, it is difficult to perform accurate correction on the time axis.

SUMMARY OF THE INVENTION In view of the above, the present invention recognizes the position of a occupant in a vehicle and automatically corrects each reproduction signal on the time axis. It is an object of the present invention to provide a passenger position recognizing device in the above.

[0007]

According to the present invention, an object of the present invention is to provide an automatic adjusting device for performing an acoustic adjustment in an on-vehicle audio device having a plurality of speakers. A plurality of microphones arranged for detecting a voice of a user in the vehicle, a signal processing unit for detecting a time difference between detection signals from the microphones and calculating the position of the user, and the signal processing unit Based on the position of the user calculated in the above, a plurality of reproduction signals are acoustically adjusted by correction on a time axis so that sound from each speaker reaches the position of the user at the same time. This is achieved by providing an adjusting unit for outputting.

According to the above configuration, the signal processing unit detects the time difference between the voices picked up by the microphones and emitted by the user for adjustment, calculates the distance difference based on the sound speed from the time difference, and calculates the distance difference of the known speaker. Calculate the position of the user based on the position. The adjustment unit corrects the reproduction signal for each speaker on the time axis based on the position of the user calculated by the signal processing unit. Therefore, the sound from each speaker is
Since the user reaches the user's position at the same time, the user hears the same sound as if he were at the intermediate position of each speaker, and can enjoy a realistic sound reproduction.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

FIG. 1 shows the configuration of an on-vehicle acoustic device provided with an embodiment of the automatic adjustment device according to the present invention. The on-vehicle acoustic device 10 includes a reproducing unit 11 for generating a reproduced signal, an adjusting device 12 for performing audio adjustment on the reproduced signal generated by the reproducing unit 11, and a reproducing signal acoustically adjusted by the adjusting device 12. Amplifying section 13 for amplifying and amplifying section 1
A speaker system 20 for converting the reproduced signal amplified in step 3 into a sound, a microphone system 30 for detecting a voice of a user in the vehicle, and a signal processing unit 40 for processing a voice signal detected by the microphone system 30. Have.

The reproducing unit 11 is, for example, a cassette tape player, a compact disk (CD) player, a mini disk (MD) player, an FM-AM tuner, or the like, and reproduces each medium or receives a radio wave. As a result, it is configured to generate a reproduction signal as is known. The adjustment device 12 is configured to correct the plurality of reproduction signals from the reproduction unit 11 on the time axis, and to perform various sound adjustments such as equalization.

The amplifying unit 13 is configured to amplify each reproduction signal. The speaker system 20
For example, as shown in FIG. 4, a plurality (eight in this example) of speakers 21L, 21R, 22 arranged at a plurality of symmetrical locations (eight in this example) in the interior of the vehicle compartment.
L, 22R, 23L, 23R, 24L, and 24R.

As shown in FIG. 4, for example, the microphone system 30 includes a plurality of (three in this example) microphones 31, 32, which are distributed and arranged so as to surround a user who sits on a seat S in a vehicle cabin. 33. Of the microphones 31, 32, and 33, the microphone 33 disposed, for example, on the front side of the vehicle compartment uses another vehicle-mounted device, for example, a microphone in a so-called hands-free device of a vehicle-mounted mobile phone. There may be. The signal processing unit 40 is configured to detect a time difference between the signals based on detection signals from the microphones 31, 32, and 33, and to calculate a user position sitting on the seat S based on the time difference. .

An operation example of such a configuration will be described. After a plurality of reproduction signals from the reproduction unit 11 are sound-adjusted by the adjustment device 12, they are amplified by the amplification unit 13 and input to the speakers 21L to 24R, so that sound is generated from each of the speakers 21L to 24R. .
Here, the correction on the time axis of each reproduction signal is performed as shown in the flowchart of FIG. First, in step ST1, when the user utters a voice for adjustment while sitting on the seat S, this voice is collected by the microphones 31, 32, and 33.

Subsequently, in step ST2, each microphone 3
When the detection signals from the microphones 1, 32, and 33 are input to the signal processing unit 40, the signal processing unit 40 responds to the detection signals from the microphones 33 to which the voice first reaches by the other microphones 31, 32.
, The delay times (time differences) T1 and T2 of the detection signal are detected. Here, as shown in FIG. 3, the position of the user is (x
0, y0), and the positions of the microphones 31, 32, 33 are (x1, y1), (x2, y2), (x3, y).
Assuming 3), the user's voice is transmitted to each microphone 31, 32, 33
Is proportional to the distance between the user and each of the microphones 31, 32, 33.

Therefore, in step ST3, the signal processing unit 40 multiplies the delay times (time differences) T1 and T2 by the speed of sound to obtain the position (x0, y0) of the user and the position (x3, y3) of the microphone 33. , The position of the user (x0, y0) and the positions of the microphones 31 and 32 (x1, y
The distance differences R1 and R2 from the distances 1) and (x2, y2) are obtained by the following equations (1) to (3).

(X1-x0) ² + (y1-y0) ² = (R0 + R1) ² (1) (x2-x0) ² + (y2-y0) ² = (R0 + R2) ² (2) (X3−x0) ² + (y3−y0) ² = R0 ² (3) Therefore, in step ST4, the signal processing unit 40 determines three unknowns x0, y0, R0 from these three simultaneous equations.
Is calculated to detect the position (x0, y0) of the user.

Next, in step ST5, the adjusting device 12
Performs the correction on the time axis for each reproduction signal based on the position (x0, y0) of the user, so that the sound from each of the speakers 21L to 24R is adjusted to the position (x
(0, y0). Further, at this time, the adjustment device 12 performs desired sound adjustment such as equalization. As described above, the user can operate each speaker 21
This means that the user listens to the same sound as that which is located at an intermediate position between L and 24R, so that it is possible to appreciate a sound with a sense of reality.

The microphone system 30 for detecting the voice of the user in the vehicle and the signal processing unit 40 for processing the signal of the voice detected by the microphone system 30 are used to recognize the position of the user in the vehicle. Can be configured.

In the above-described embodiment, the speaker system 20 comprises eight loudspeakers 2 arranged symmetrically.
Although the number of speakers is 1L to 24R, the present invention is not limited to this, and the present invention can be applied to any number of speakers. The microphone system 30 includes three microphones 31, 32, and 33. However, the present invention is not limited to this, and any number of microphones may be used as long as the microphones are distributed so as to surround the user. The present invention can be applied.

[0021]

As described above, according to the present invention, the correction on the time axis of each reproduction signal can be automatically performed, so that the user is in the same position as the one located at the intermediate position of each speaker. By listening to the sound, it is possible to appreciate the reproduced sound with a sense of reality.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a configuration of an on-vehicle acoustic device provided with an embodiment of an automatic adjustment device according to the present invention.

FIG. 2 is a flowchart showing an operation of the automatic adjustment device of FIG. 1;

FIG. 3 is a schematic diagram showing a relationship between each microphone position and a user position in the automatic adjustment device of FIG. 1;

FIG. 4 shows a speaker arrangement of a general on-vehicle acoustic device and FIG.
FIG. 2 is a schematic plan view showing a microphone arrangement in the automatic adjustment device of FIG.

[Explanation of symbols]

10 ... on-board acoustic device, 11 ... reproduction unit, 12
..Adjustment devices, 13 amplifying units, 20 speaker systems, 21L, 21R, 22L, 22R, 23L,
23R, 24L, 24R: speaker, 30: microphone system, 31, 32, 33: microphone, 40 ·
..Signal processing units

Claims (5)

[Claims] 1. An automatic adjustment device for performing audio adjustment in an on-vehicle audio device having a plurality of speakers, wherein the automatic adjustment device is provided at a plurality of locations in a vehicle and detects voices of a user in the vehicle. A plurality of microphones; a signal processing unit that detects a time difference between detection signals from the microphones and calculates a position of the user; and a signal processing unit that calculates the position of the user based on the position of the user calculated by the signal processing unit. An adjustment unit that adjusts the sound of a plurality of reproduction signals by correcting on a time axis so that sound from a speaker reaches the position of the user at the same time and outputs the sound to the corresponding speaker. Automatic adjustment device for audio equipment. 2. The automatic adjustment of the on-vehicle audio device according to claim 1, wherein the adjustment unit is configured to perform other audio adjustments on the reproduced signals together with correction on a time axis. apparatus. 3. The automatic adjustment device for an in-vehicle device according to claim 1, wherein the microphone uses a voice recognition microphone of another in-vehicle device. 4. A device for recognizing a position of a occupant in a vehicle, comprising: a plurality of microphones respectively provided at a plurality of locations in the vehicle and detecting voices of a user in the vehicle; A signal processing unit that detects the time difference between the detection signals of the above and calculates the position of the user. 5. The apparatus according to claim 4, wherein the microphone uses a microphone for voice recognition of an in-vehicle device.