JPH0733513Y2 - Sound field correction device for automobile - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention responds to changes in the passenger compartment, opening and closing of windows, and the like, and corrects the sound field to an optimum sound field for the changed situation. The present invention relates to a sound field correction device for an automobile.

2. Description of the Related Art In a typical prior art sound field correction device installed in an in-vehicle sound reproduction device, when the vehicle interior situation changes,
Each time the change occurs, the correction start switch is operated to correct the sound field.

Therefore, in the conventional technique as described above, the correction start switch has to be operated every time the state of the vehicle interior changes, and the operation is complicated.

An object of the present invention is to provide a sound field correction device for an automobile with improved operability.

Means for Solving the Problems The present invention is to output a correction acoustic signal for performing correction from a speaker installed in a passenger compartment of an automobile, detect the correction acoustic signal output from the speaker with a microphone,
A sound field correction device that performs a sound field correction operation of performing frequency analysis of a signal detected by the microphone and adjusting a frequency equalizer for correcting a frequency characteristic of an acoustic signal to be reproduced according to the analysis result. A seating situation detecting means for detecting a situational change of the situation and a starting means for starting the sound field correcting operation when the seating situation detecting means detects a situational change in the vehicle interior are provided. It is a sound field correction device.

Further, the present invention outputs a correction acoustic signal for performing correction from a speaker installed in the interior of an automobile, detects the correction acoustic signal output from the speaker with a microphone, and outputs the signal detected with the microphone. In the sound field correction device that performs the sound field correction operation of performing the frequency analysis of the sound field and correcting the frequency characteristic of the sound signal to be reproduced according to the analysis result, the change in the situation of the opening and closing state of the automobile window A sound field correction device for an automobile, comprising: a window condition detection unit for detecting the above condition; and a starting unit for starting the sound field correction operation when the window condition detection unit detects a change in the vehicle interior. Is.

According to the present invention, when the seating situation detecting means or the window situation detecting means detects a change in the sitting situation of the occupant or a change in the opening / closing state of the window, the sound field correcting means outputs an acoustic signal from the speaker. Then, the sound from the speaker under the changed vehicle interior condition is detected by the microphone, and the sound field in the vehicle interior is automatically corrected based on the detection result.

Therefore, when the occupant's seating situation changes, or when the window opening / closing situation changes, correction is automatically performed to obtain the optimum sound field under the changed situation.
The listener does not need to correct the sound field every time the state of the vehicle interior changes, and the operability is remarkably improved.

Embodiment FIG. 1 is a block diagram showing the electrical construction of an on-vehicle sound reproducing apparatus 1 according to an embodiment of the present invention. In this sound reproducing device 1, for example, a sound signal VFR from a sound signal source 2 such as a compact disc reproducing device or a magnetic tape reproducing device is used.
VFL; VRR, VRL are graph equalizers G1 to G, respectively
4 and power amplifier circuits A1 to A4, through the speakers FR, FL: R
Sounded from R and RL.

FIG. 2 is a plan view schematically showing a vehicle body 3 on which the sound reproducing device 1 is mounted. In the passenger compartment 4 of the vehicle body 3, the speaker FR is arranged in front of the driver's seat PFR, the speaker FL is arranged in front of the passenger seat PFL, the speaker RR is arranged behind the right rear seat PRR, and the speaker RL is It is located behind the left rear seat PRL. Each seat PFR, PFL: PRR, PRL is provided with a pressure switch S1-S14, and each seat PF
These pressure switches S11 to S14 are brought into conduction when a person gets on the R, PFL; PRR, PRL.

Further, each of the side windows WFR, WFL; WRR, WRL (hereinafter referred to as reference numeral W when collectively referred to) is provided with window opening / closing switches S21 to S24 as shown in FIG. 3, respectively. When the window W is closed as shown in 1), the window opening / closing switches S21 to S24 are shut off, and FIG.
When the window W is open as shown by, the window opening / closing switches S21 to S24 are conducted.

The occupant data from the pressure switches S11 to S14 and the window opening / closing data from the window opening / closing switches S21 to S24 are given to the processing circuit 5. Frequency analyzers 6 and 8 are provided in association with the processing circuit 5, and these frequency analyzers 6 and 8 are provided.
Reference numerals 6 and 8 are for outputting a signal indicating the frequency distribution of the input signal. The acoustic signal detected by the microphone 7 is input to the frequency analyzer 6, and the frequency analyzer 8 is supplied from the adder 9 A signal obtained by adding a part of the acoustic signals VFR, VFL; VRR, VRL given to the derived speakers FR, FL; RR, RL is input. Then, the frequency distribution signals Va and Vb respectively output from the frequency analyzers 6 and 8 are given to the processing circuit 5. The microphone 7 is provided, for example, near the headrest 10 of the driver's seat PFR. Based on the frequency distribution signals Va and Vb from the frequency analyzers 6 and 8, the occupant data, and the window opening / closing data, the processing circuit 5 optimizes the sound field in the passenger compartment 4 by using the graph. It's equalizer G1, G
2; Change frequency characteristics of G3 and G4.

That is, when the number of occupants or seating positions change, or when the window W is opened or closed and the condition inside the vehicle changes, the processing circuit 5 changes those changes by the switches S11 to S14; S21 to S24.
When the situation in the vehicle compartment 4 changes as described above, the frequency distribution signal Va of the acoustic signal detected via the microphone 7 and the respective speakers FR, FL; RR, RL are given. Frequency distribution signal Vb obtained from the sum of the sound signals
And are sampled for a certain period of time, and the graph equalizers G1, G2; G3, G are set so as to cancel the difference between their frequency components.
Change the frequency characteristics of 4.

Graphic equalizers G1, G2; G3, G adjusted and changed corresponding to the detection results of the pressure switches S11 to S14; S21 to S24.
Reference numeral 4 is predetermined, and is adjusted and changed so that the acoustic characteristic in the vehicle interior 4 becomes flat, for example, or the characteristic desired by the listener. In this way, when the number and positions of the occupants change, or when the situation inside the vehicle compartment 4 changes due to the opening / closing operation of the window W, the sound field is automatically generated by the processing circuit 5. Correction is performed and operability is significantly improved.

FIG. 4 is a flow chart for explaining the operation. When the power is turned on at step n1 such that the ignition key switch is turned on, the number of occupants is detected at step n2 from the switching mode of the pressure switches S11 to S14. In step n3, the window open / close switches S21 to S24
The open / closed state of each window W is detected from the switching mode.

In step n4, the processing circuit 5 operates based on the detection results of the steps n2 and n3.
8 and the adder 9 are activated to start the sound field correction. At step n5, the frequency distribution signal Va from the frequency analyzer 6 and the frequency distribution signal Vb from the frequency analyzer 8 are sampled for a certain period of time, and the difference between the sampled frequency distribution signals Va and Vb is obtained at step n6. , Step n7
Move to.

In step n7, the frequency distribution signals Va and V obtained in step n6
Based on the difference in b, the signal equalizer Va adjusts the larger and smaller frequency components, and the signal Va adjusts the equalizers G1 to G4 so as to amplify the smaller frequency components, and then moves to step n8. From the detection outputs of S11 to S14; S21 to S24, it is determined whether or not the situation in the vehicle interior 4 has changed. If not, that is, when there is a change,
The sound field correction operation is repeated again by returning to step n2,
When that is the case, that is, when there is no change in the situation in the passenger compartment 4, this step n8 is repeated until the change occurs.

In the above-mentioned embodiment, the sound field correcting operation is performed by reproducing the sound signal from the sound signal source 2, but as another embodiment of the present invention, as shown by the sound reproducing device 11 in FIG.
Acoustic signal source 2 and each graphic equalizer G1, G2; G3, G4
Switching switches S31 to S34 are provided between and, when the sound field correction operation is performed, the frequency components over the entire audible frequency band from the noise generation circuit 12 are output from the speakers FR, FL; RR, RL. A noise signal called so-called white noise including is reproduced, the noise signal thus reproduced is detected by the microphone 7 and the frequency analyzer 6, and a component for each frequency band is detected based on the detection result. The processing circuit 5 may change the frequency characteristics of the graphic equalizers G1, G2; G3, G4 so that the desired value is obtained. In this case, the configurations of the adder 9 and the frequency analyzer 8 can be omitted. In addition, each graph equalizer
The frequency bands of G1 to G4 may be individually adjusted by the processing circuit 5.

Furthermore, in each of the above-described embodiments, the sound field correction is performed by changing the frequency characteristics of the graphic equalizers G1 to G4, but as still another embodiment of the present invention, the power amplifier circuits A1 to A4. May be changed, or the delay time of each audio signal VFR, VFL; VRR, VRL may be changed, and thus the listener's preference and the type of music to be played It may be corrected so as to have an optimum sound field corresponding to the above.

As described above, according to the present invention, when the seating situation detecting means or the window situation detecting means detects a change in the occupant's sitting situation or a change in the window opening / closing state, the changed vehicle interior Since the sound from the speaker under the situation is detected, and the sound field in the vehicle compartment is automatically corrected based on the detection result, the listener, every time the seating situation of the occupant changes, Further, it is not necessary to correct the sound field every time the opening / closing state of the window changes, and the operability can be significantly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a sound reproducing device 1 according to an embodiment of the present invention, FIG. 2 is a plan view showing a simplified body 3 of the sound reproducing device 1, and FIG. FIG. 4 is a sectional view for explaining the detection operation of the window opening / closing switches S21 to S24, FIG. 4 is a flow chart for explaining the operation, and FIG. 5 is an electrical configuration of the sound reproducing device 11 of another embodiment of the present invention. It is a block diagram showing. 1, 11 ... Sound reproduction device, 2 ... Sound signal source, 3 ... Car body, 4 ... Car interior, 5 ... Processing circuit, 6,8 ... Frequency analyzer, 7 ... Microphone, 9 ... Adder, 12 …… Noise generator circuit, G1 to G4 …… Graphic equalizer, FR, FL;
RR, RL …… Speaker, S11-S14; S21-S24 …… Switch,
S31-S34 …… Switching switch

Claims (2)

[Scope of utility model registration request] 1. A signal output from a speaker installed in a passenger compartment of an automobile for correction, for correction, the correction acoustic signal output from the speaker being detected by a microphone, and the signal being detected by the microphone. In the sound field correction device that performs the sound field correction operation that adjusts the frequency equalizer that corrects the frequency characteristics of the acoustic signal to be reproduced according to the analysis result of the frequency analysis, the change in the seating condition of the occupant is detected. A sound field correction apparatus for an automobile, comprising: a seating situation detecting means for operating the vehicle; and a starting means for starting the sound field correcting operation when the seating situation detecting means detects a situation change in the vehicle compartment. 2. A correction acoustic signal for correction is output from a speaker installed in a passenger compartment of an automobile, the correction acoustic signal output from the speaker is detected by a microphone, and the signal detected by the microphone. In the sound field correction device that performs the sound field correction operation of performing the frequency analysis of the sound field and correcting the frequency characteristic of the sound signal to be reproduced according to the analysis result, the change in the situation of the opening and closing state of the automobile window A sound field correction device for an automobile, comprising: a window condition detection unit for detecting the above condition; and a starting unit for starting the sound field correction operation when the window condition detection unit detects a change in the vehicle interior. .