JP2574346Y2 - Localization control circuit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound source localization control circuit.

[0002]

2. Description of the Related Art A description will be given of localization control in the case of a vehicle-mounted acoustic device. As shown in FIG. 3, speakers A to D are arranged at the four corners of the vehicle interior, and the listening points in the vehicle interior are set at 1 to 4 points.
In this case, the distances from the person at the listening point 1 to the speakers A to D are ra, rb,
rc and rd, and rb <ra <rd <rc. The localization control compensates for the difference in sound level (sound pressure) caused by the distance between the listener and the speaker, and the time difference (phase difference) before reaching the sound. Since the level of the sound is inversely proportional to the square of the distance, in this example, if the levels of the sounds emitted from the speakers A to D are Pa, Pb, Pc, and Pd, respectively,
To make the level of the sound emitted from speakers A to D heard by the person at listening point 1 equal, Pb <Pa <Pd <Pc
Conditions are required. In order to simultaneously hear sounds emitted from speakers A to D heard by the person at listening point 1, each speaker A to D with respect to a certain time is used.
Ta, Tb, Tc,
If Td, Tb>Ta>Td> Tc must be satisfied. This is illustrated in FIG.

[0003]

However, according to the conventional localization control, as shown in FIG.
If it is possible to select 5 listening points,
If the balance is changed for a listening point other than the listening point 5, the localization control uses a digital signal processor (D) to determine the sound pressure difference and phase difference caused by the distance from the speaker to the listening point.
SP), there is a problem in that the localization made inside the digital signal processor goes wrong. A similar problem also occurs when so-called panning control for supplying an audio signal sequentially so as to swirl over each speaker is performed.

An object of the present invention is to provide a localization control circuit which solves the above-mentioned problem by automatically controlling the balance to return to the center.

[0005]

Localization control circuit of the present invention According to an aspect of the spin - the localization control circuit for controlling orientation by correcting the sound pressure and the phase difference caused by the distance to the listening point from mosquitoes, previously localization mode Compatible with
When the localization control value to be set is set and the localization mode for a listening point other than the center listening point is designated, the left and right balance is centered before the localization control to the localization control value corresponding to the designated localization mode. And a control means for performing control.

The control means can store the information corresponding to the center of the right and left balances, and can independently control the left and right channel audio information in response to the information stored in the storage means. And an electronic volume.

[0007]

According to the localization control circuit of the present invention, when the localization mode for a listening point other than the center listening point is designated, the left and right sides are controlled by the control means prior to the localization control to the designated localization mode. The balance is controlled by the center. For this reason, in the localization control, the deviation of the localization that occurs because the left and right balance is not at the center is eliminated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. The left and right audio signals are supplied to an A / D converter 11 and converted into digital signals. The left and right audio signals converted to digital signals are converted to digital signal processor 1
The digital signal processor 12 controls the digital signal processor 12 to perform level control and delay control under the control of the microcomputer 14, thereby performing localization control and control in the panning mode.

The keyboard 13 has a balance instruction key 131 for instructing left and right balance, a panning mode instruction key 132, a localization instruction key 133 for sequentially instructing switching of the localization mode when pressed, and A setting key 134 for left and right balance adjustment. The microcomputer 14 is supplied with a signal from the key of the keyboard 13, and performs an operation corresponding to the depressed key.

Each of the front right, front left, rear right, and rear left digital signals output from the digital signal processor 12 is supplied to a D / A converter 15 and individually converted into an analog signal. The analog signal output from the D / A converter 15 is supplied to the speakers A to D via the electronic volume 16 and is converted into sound. Here, the front right analog signal output from the electronic volume 16 is to the speaker B, the front left analog signal to the speaker A, the rear right analog signal to the speaker D, and the rear left analog signal. Is supplied to the speaker C.

On the other hand, the electronic volume 16 is configured so that the balance of the left and right channel audio signals can be controlled independently of the left and right channels, and a microcomputer which stores information corresponding to the center of the left and right balance. 14 receives the information from the memory 14 under the control of the microcomputer 14 and operates the left and right channel Os corresponding to the information.
In addition to controlling the balance of the audio signal to the center, receiving the balance information designated from the microcomputer 14 under the control of the microcomputer 14, the left and right channel audio signals are brought into the designated balance state. Perform balance control.

Next, the indication localization mode by the localization indication key-133 will be described. The localization mode is an a mode in which the position 1 is a listening point, a b mode in which the position 2 is a listening point, a c mode in which the position 3 is a listening point, and a listening point in which the position 4 is a listening point. There is a d-mode and an e-mode in which the center, that is, the position of 5, is a listening point, and is sequentially designated each time the localization instruction key-133 is pressed, and the designated instruction localization mode is designated next. Mode is stored in the memory of the microcomputer 14 until the localization instruction key-133 is depressed next time, and a new balance is set by the setting key 134. Until the balance setting data set immediately before is stored.
Also, the memory stores data for controlling the center of the left and right balance as described above.

The operation of the localization control circuit of the embodiment constructed as described above will be described with reference to a flowchart shown in FIG. 2 based on a program stored in the program memory of the microcomputer 14. .

When the localization control starts, it is checked whether or not a key input has been made (step S1), and the flow waits for a key input. When it is determined that a key input has been made, it is checked whether or not the input key is the balance instruction key 131 (step S2). Balance instruction key 131
If it is determined that the current mode is e, it is checked whether the mode is the e mode (step S3). If it is determined that the mode is the e-mode, a desired balance is set by operating the setting key 134, and the set balance state is controlled by the electronic volume 16 (step S).
4). The balance setting data set in step S4 is stored in the memory of the microcomputer 14, and the previously stored setting data is updated to the newly set setting data. Therefore, the balance can be set only in the e-mode. Step S4
If it is determined in step S that the mode is not the e-mode, step S
Wait for execution of 1.

If it is determined in step S2 that the pressed key is not the balance instruction key 131, it is checked whether the pressed key is the localization instruction key 133 (step S5). If it is determined in step S5 that the key is the localization instruction key-133, it is checked whether the mode is the e mode (step S6). If it is determined that the mode is the e-mode, execution of step S1 is waited. If it is determined in step S6 that the mode is not the e mode,
It is checked whether the left and right balance is at the center (step S7).

If it is determined in step S7 that the left and right balance is at the center, an instruction is issued by pressing the localization instruction key-133 in step S5, and the signal processor 12 is controlled in the localization mode to perform localization control. Then, execution of step S1 is waited. If it is determined in step S7 that the right and left balance is not at the center, the electronic volume 16 is controlled under the control of the microcomputer 14 and the center stored in the memory of the microcomputer 14 is controlled. After the left and right balances are set to the center in accordance with the data, the localization control is performed by controlling the signal processor 12 in the localization mode instructed by pressing the localization instruction key-133 in step S5 (step S5). S8). Then, execution of step S1 is waited.

If it is determined in step S5 that the pressed key is not the localization instruction key-133, it is checked whether the panning mode instruction key 132 has been pressed (step S9). If it is determined in step S9 that the panning mode instruction key 132 has been pressed, step S7 is executed following step S9.
The key pressed in step S9 is a panning key.
If it is determined that it is not 132, it waits for execution of step S1 following step S9.

As described above, the balance adjustment can be performed only in the e-mode because the listening point is the center in the e-mode and the distance from the speakers A to D is the same. Since the digital signal processor 12 outputs a signal of the same level, the balance can be adjusted. In modes other than the e mode, the distances from the speakers A to D are different from each other, so that the output level, volume and phase are different. Therefore, if the balance between left and right is tilted right or left in modes other than e mode,
Even if the localization control is performed by the corner listening point,
The left and right balance is set to the center because the localization goes wrong. The same can be said for the panning mode. That is, since the four speakers are independently controlled, the left and right balance must be centered.

[0019]

As described above, according to the present invention, when the user performs the localization control while adjusting the left / right balance, the left / right balance is automatically set to the center without the user's operation. Since the adjustment is performed, there is an effect that the localization does not become out of order even when the localization control is performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of an embodiment of the present invention.
It is a chart.

FIG. 3 is a schematic diagram showing positions of a seat and a speaker in a vehicle cabin for explaining the localization control.

FIG. 4 is a schematic diagram showing a relationship between a distance and a sound pressure level for explaining localization control.

FIG. 5 is a schematic diagram for explaining a panning mode of the localization control.

[Explanation of symbols]

 A to D speakers 1 to 5 Seat position 11 A / D converter 12 Digital signal processor 13 Keyboard 14 Microcomputer 15 D / A converter 16 Electronic volume 131 Balance instruction key 132 Panning model -Indication key 133 Localization instruction key 134 Setting key

Claims (2)

(57) [Scope of request for utility model registration] 1. A spin - the localization control circuit for controlling orientation by correcting the sound pressure and the phase difference caused by the distance to the listening point from mosquitoes, previously localization mode
A localization control value corresponding to the mode is set, and a localization mode for a listening point other than the center listening point is set.
When the mode is specified, the location corresponding to the specified localization mode
A localization control circuit comprising control means for controlling the left / right balance to a center prior to localization control to a localization control value . A control means for storing information corresponding to the center of the right and left balances, and independently of the left and right channel audio information in response to the information stored in the storage means. 2. The localization control circuit according to claim 1, further comprising a controllable electronic volume.