JPH04132799U - Localization control circuit - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a localization control circuit that eliminates localization errors when specifying a localization mode for a listening point other than the center listening point in localization control. [Configuration] When controlling to the localization mode specified by the localization instruction key 133, if the left and right channels are not balanced at the center, the microcomputer
An electronic volume 16 is provided to receive data for controlling the left and right balance to the center and control the balance of the left and right channels to the center, which is stored in the memory of the controller 14. Channel balance is now controlled at the center.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a sound source localization control circuit.

0002

[Conventional technology]

Localization control will be explained in the case of in-vehicle audio equipment. As shown in Figure 3, inside the vehicle Place speakers A to D in the four corners of the vehicle, and indicate the listening points in the vehicle interior with numbers 1 to 4. For example, speakers A to D as seen from the person at listening point 1. Their distances are ra, rb, rc, and rd, and rb<ra<rd<rc. fixed The level control is based on the difference in sound level (sound pressure) caused by the distance between the listener and the speaker. This is to compensate for the time difference (phase difference) until the Sound level is squared with distance In this example, the level of sound output from speakers A to D is inversely proportional to If Pa, Pb, Pc, and Pd are the speakers at listening point 1, In order to make the sound levels from A to D the same, the condition Pb<Pa<Pd<Pc is satisfied. is necessary. Also, the sound emitted from speakers A to D heard by the person at listening point 1. can be heard simultaneously from each speaker A to D based on a certain time. If the time until sound is produced is Ta, Tb, Tc, and Td, then Tb>Ta> Td>Tc must be satisfied. This is illustrated in FIG. 4.

0003

[Problem that the idea aims to solve]

However, with conventional localization control, as shown in FIG. If it is possible to select 5 listening points, listening points 5 and above are possible. If you leave the balance changed when the listening point is outside, Control is based on the sound pressure difference and phase caused by the distance from the speaker to the listening point. Achieved by correcting the difference using a digital signal processor (DSP) Because of this, the localization created inside the digital signal processor is distorted. There was a point. Also, the audio can be played around each speaker in sequence. A similar problem occurs when configured to perform so-called panning control that supplies signals. arise.

0004 This invention automatically controls the balance to return to the center. The object of the present invention is to provide a localization control circuit that solves problems.

[0005]

[Means to solve the problem]

The localization control circuit of this invention depends on the distance from the speaker to the listening point. A localization control circuit that controls localization by correcting the sound pressure difference and phase difference caused by positioning mode for listening points other than the center listening point. When a mode is specified, the left and right balance is The invention is characterized in that it is equipped with a control means for centrally controlling the device.

[0006] The control means includes a storage means storing information corresponding to the center of left and right balance, and a recording means. Receiving the information stored in the storage means, the left and right channel audio information is determined in accordance with the information. It may also consist of an electronic volume whose information can be controlled independently.

[0007]

[Effect]

According to the localization control circuit of the present invention, listening at points other than the center listening point When the localization mode for a point is specified, the localization system is set to the specified localization mode. Prior to the control, the left and right balance is controlled to the center by the control means. others In order to avoid misalignment of localization caused by the left and right balance not being centered during localization control, It will disappear.

[0008]

【Example】

The present invention will be explained below with reference to examples. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The left and right audio signals are supplied to the A/D converter 11 and converted into digital signals respectively. Convert. The left and right audio signals converted to digital signals are digital signals. The digital signal processor 12 supplies the By performing level control and delay control under the control of the computer 14. Performs localization control and control during panning mode.

[0009] The keyboard 13 includes a balance instruction key 131 for instructing left and right balance, and a pan By pressing the imaging mode instruction key 132, you can switch the localization mode in sequence. Localization instruction key 133 for instructing and setting key 134 for left/right balance adjustment Contains. The microcomputer 14 receives input from the keys on the keyboard 13. A signal is supplied to perform the action corresponding to the pressed key.

0010 The front right, front left, and rear signals output from the digital signal processor 12 The rear right and rear left digital signals are each supplied to the D/A converter 15, and each is assigned separately. Convert to analog signal. The analog signal output from the D/A converter 15 is The signal is supplied to speakers A to D via the volume 16 and converted into audio. Here, electronic The front right analog signal output from volume 16 is sent to speaker B. The rear left analog signal goes to speaker A, the rear right analog signal goes to speaker D, The rear left analog signal is supplied to speaker C.

[0011] On the other hand, the electronic volume 16 adjusts the balance of the left and right channel audio signals. Constructed so that each channel can be controlled independently, corresponding to the center of left and right balance The microcomputer 14 stores information stored in the microcomputer 14. - receiving the information under the control of the controller 14 and adjusting the left and right channel settings in response to the information; - The microcomputer 14 controls the balance of the audio signal at the center. receiving specified balance information from the microcomputer 14 under the control of , performs balance control of the left and right channel audio signals to the specified balance state. cormorant.

0012 Next, the localization mode indicated by the localization instruction key 133 will be explained. Localization mode The mode is A mode where the listening point is at position 1, and the listening point is at position 2. B mode with listening point at position 3, C mode with position 3 as listening point, position 4 d mode with the listening point set at the center, that is, the listening point There is an e mode in which the position is set to 1. , the designated localization mode will remain the same until the next designated localization mode, that is, the next localization instruction key 1. Until 33 is pressed down, the previous mode is the memo of the microcomputer 14. The balance is stored in the memory, and a new balance setting can be made using the setting key 134. The most recently set balance setting data is stored until the balance setting data is changed. Also, applicable The memory stores data for controlling the left and right balance center as described above. are doing.

[0013] The operation of the localization control circuit of this embodiment configured as described above was performed using a microcomputer. The screen shown in FIG. 2 is created based on the program stored in the program memory of the computer 14. This will be explained according to the flowchart.

[0014] When localization control starts, it is checked whether there is a key input (step S1) Waits for a key input. It was input when it was determined that there was a key input. It is checked whether the key is the balance instruction key 131 (step S2). . When it is determined that it is the balance instruction key 131, it is checked whether the mode is e-mode or not. is checked (step S3). When it is determined that the mode is e-mode, press the setting key. The desired balance is set by operating 134, and the set balance is The state is controlled by the electronic volume 16 (step S4). Step S The balance setting data set in step 4 is stored in the memory of the microcomputer 14. The previously stored setting data becomes the newly set setting data. Updated. Therefore, balance setting is only possible in e mode. Ru. If it is determined in step S4 that the mode is not e-mode, step S1 is executed. wait in line

[0015] It is determined that the key pressed in step S2 is not the balance instruction key 131. , it is checked whether the pressed key is the localization instruction key 133 ( Step S5). In step S5, it is determined that it is the localization instruction key 133. If so, it is checked whether the mode is e mode or not (step S6). in e-mode If it is determined that there is, execution of step S1 is waited. In step S6, e-mo - If it is determined that the card is not in the (Step S7).

[0016] When it is determined in step S7 that the left and right balance is at the center, The localization mode is signaled by pressing the localization instruction key 133 in step S5. The null processor 12 is controlled to perform localization control, and then step S1 is executed. wait. When it is determined in step S7 that the left and right balance is not at the center The electronic volume 16 is controlled under the control of the microcomputer 14. , according to the center data stored in the memory of the microcomputer 14. After the balance is set to the center, the localization instruction key 133 is pressed in step S5. When the button is pressed, the signal processor 12 is controlled to the localization mode and the localization is controlled. control is performed (step S8). Next, execution of step S1 is awaited.

[0017] In step S5, it is determined that the pressed key is not the localization instruction key 133. When the panning mode instruction key 132 is pressed, it is checked. (Step S9). In step S9, the panning mode instruction key 132 is pressed. When it is determined that the button has been pressed, step S7 is executed following step S9. . It is determined in step S9 that the pressed key is not the panning key 132. If so, it waits for step S1 to be executed following step S9.

[0018] As mentioned above, the reason why balance adjustment can only be performed in e mode is because e In mode, the listening point is the center, and the distance from speakers A to D is the same. The digital signal processor 12 outputs signals of the same level. This made it possible to adjust the balance. In other modes other than e mode, Since the distances from speakers A to D are different, the output level, volume, and phase will be different. It's coming. For this reason, the left and right balance may be tilted to the right or left in modes other than e mode. Even if you try to control the localization using the listening point, the localization may be distorted. In order to keep the left and right balance in the center. Also, panning mode The same can be said for the case. In other words, you can control four speakers independently. Therefore, it is necessary to keep the left and right balance in the center.

[0019]

[Effect of the idea]

As explained above, according to the present invention, the user can maintain balance while adjusting the left and right balance. When performing position control, the left and right balance is automatically adjusted without any operation by the user. The effect is that the localization will not go out of order even if the localization is controlled. There is.

[Brief explanation of drawings]

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

[Fig. 2] Flowchart for explaining the operation of one embodiment of the present invention.
It is a chart.

FIG. 3 is a schematic diagram showing the positions of seats and speakers in a vehicle interior for explaining localization control.

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

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

[Explanation of symbols]

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

Claims (2)

[Scope of utility model registration request] [Claim 1] In a localization control circuit that controls localization by correcting the sound pressure difference and phase difference caused by the distance from the speaker to the listening point, a localization mode is specified for a listening point other than the center listening point. 1. A localization control circuit comprising: control means for controlling left and right balance to the center prior to localization control to a specified localization mode. 2. The control means includes a storage means that stores information corresponding to a center of left and right balance, and receives the information stored in the storage means and independently controls left and right channel audio information in accordance with the information. 2. The localization control circuit according to claim 1, further comprising a controllable electronic volume.