KR19980069211A - Car audio speaker output control method - Google Patents

Abstract

The present invention relates to a method for controlling speaker output of car audio, comprising: a front speaker distance measuring step of measuring a distance between a front speaker and a listener position; and a rear speaker and a rear speaker after measuring the distance between the front speaker and the listener in this front speaker distance measuring step In the rear speaker distance measuring step of measuring the distance from the listener position, and in this rear speaker distance measuring step, the distance between the rear speaker and the listener is measured, and then the distance between the front speaker and the listener position is measured. The measurement data storage step of storing the data (Z) obtained by dividing the absolute difference from the measured value (X) by the sound wave velocity, and the front speaker measurement value (X) and the rear speaker measurement value currently measured in this measurement data storage step. The distance measured between the front speaker and the listener is determined by the speaker measurement value judging step comparing the size of (Y) and the speaker measurement value judging step. If it is determined that the output of the rear speaker delayed by the calculated data (Z msec) outputs the rear speaker delay output step and the speaker measurement value size determination step as a result of determining that the distance value measured between the rear speaker and the listener is large The front speaker delay output stage delays the output of the front speaker by the calculated data (Z msec) and outputs sound distortion such as canceling and reinforcing a specific frequency by allowing the output sound to reach the listener within the same time. You can increase the listening effect by reducing.

Description

Car audio speaker output control method

The present invention relates to a method of controlling the speaker output of car audio, and in particular, by measuring the distance between the front and rear speakers mounted on a vehicle and the listener and delaying the output of a specific speaker according to the distance difference. The present invention relates to a method of controlling speaker output of car audio, which reduces distortion and improves listening effect.

In general, a general configuration of car audio according to an audio signal input includes an audio signal processor 73 for adjusting a volume, tone, and sound balance of a predetermined voice signal output from a deck driver and a tuner, not shown, as shown in FIG. 1. And an audio amplifier 74 which amplifies the sound signal adjusted by the audio signal processing unit 73 according to a predetermined control signal at an audible frequency of a predetermined level.

The audio amplifier 74 is connected to a front speaker 75 and a rear speaker 76 which are installed at the front and rear of the vehicle to output the amplified voice frequencies according to the audible frequency to the outside.

Here, the operation of a general car audio having such a configuration will be described. First, a passenger in a vehicle selects a specific button (here, the radio function is described here) among function buttons such as radio, tape, and CD to listen to the car audio. do. Then, a predetermined signal is applied to a microcomputer not shown, and an audio signal of a specific radio channel tuned by the tuner unit is applied to the audio signal processor 73 according to the control signal of the microcomputer. Then, the audio signal processing unit 73 is applied to the audio amplifier 74 by adjusting the volume, balance and timbre according to the user's key operation from the input constant audio signal. In this case, the audio amplifier 74 low-frequency amplifies the input audio signal to a predetermined level, and the low-frequency amplified audio signal is output to the outside through the front speaker 75 and the rear speaker 76 mounted in the vehicle interior. .

On the other hand, the car audio installed in the vehicle is equipped with a high quality and high power product for the amplifier as well as the speaker to satisfy the user's desire for sound quality, and installs a plurality of speakers to maintain a uniform sound state. The installation position is located at the rear or left and right sides of the rear seats and at the front or side of the driver's seat and the passenger seat. Normally, the driver listening to music adjusts the balance and faders installed on the front panel of the car audio to balance the sound output from the front and rear speakers. If the listener is located at the point where the arrival time of the coincides, the effect is best felt.

However, the distance between the front and rear speakers installed in the vehicle is different depending on the size, phenomenon, and speaker attachment position of each car, and the arrival time of the sound wave to the driver or listener differs due to the distance difference between each speaker. The sound that eventually reaches the driver due to the time difference is reinforced and canceled with each other according to the phase difference, and also interferes with the frequency component of the sound output through the front and rear speakers, that is, odd or even multiples of half-wavelength, so that a specific frequency cancels out. And there was a problem that the distortion phenomenon such as reinforcement.

Therefore, the present invention was devised to solve the above problems, and the time difference is calculated by measuring the distance between the listener and the rear speaker and the distance between the listener and the front speaker in a corresponding vehicle, and the sound of the speaker as close as the calculated time difference is calculated. It is an object of the present invention to provide a method of controlling the speaker output of car audio which can enhance the sound listening effect by reducing the distortion of sound caused by the distance difference of the speaker by delaying the occurrence time.

The present invention for achieving the above object is the front speaker distance input step of measuring the distance between the front speaker and the listener position and input the value, the rear speaker to measure the distance between the rear speaker and the listener position and input the value Data obtained by dividing the absolute value difference between the distance input step and the measured value (Y) after measuring the distance between the rear speaker and the listener, and the previously measured value (X) between the front speaker and the position of the listener. A measurement data storage step of storing (Z), and a speaker measurement value judging step of comparing the magnitudes of the front speaker measurement value (X) and the rear speaker measurement value (Y) currently measured in this measurement data storage step; If it is determined that the distance measured between the front speaker and the listener is large, the output of the rear speaker is delayed by the calculated data (Z msec). A large delay output step and a front speaker delay output step of delaying the output of the front speaker by the calculated data (Z msec) when it is determined that the distance value measured between the rear speaker and the listener is large as determined in the speaker measurement value size determination step. Characterized in that is provided.

1 is a block diagram illustrating the operation of a general car audio.

2 is a block diagram illustrating operation in accordance with the present invention.

3 is a flow chart in accordance with the present invention.

<Explanation of symbols on the main parts of the drawings>

5: A / D converter 6: digital signal processor

7: memory 8: key input

9: D / A Converter 10: Audio Amplifier

11: front speaker 12: rear speaker

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 2, the configuration according to the present invention includes an A / D converter 5 for converting an analog signal into a digital signal, and a value corresponding to a distance between the front and rear speakers and the listener. A digital signal processor (6) for controlling a digital signal input from the A / D converter (5) in accordance with a key input unit (8), distance data input from the key input unit (8), and the digital signal processor (6). A memory 7 for temporarily storing a digital signal for a delay time in the N s, a D / A converter 9 for converting a digital signal of a predetermined level digitally processed by the digital signal processor 6 into an analog signal, An audio amplifier 10 for amplifying a constant analog audio signal output from the D / A converter 9 to a predetermined level, and a front speaker for outputting an audio signal amplified to a predetermined level from the audio amplifier 10 to the outside ( 11) and rear speakers (12) It is achieved.

On the other hand, look at the operation of the present invention made of such a configuration as follows.

First, in order to prevent deterioration of sound effects of the car audio due to the difference in distance between the front and rear speakers installed in the vehicle, the distance between the listener and the front and rear speakers is keyed in the car audio mounted in the vehicle. It is input through the input unit 8. That is, the distance between the front speaker 11 and the listener (usually corresponding to the ear of the human body), in which the listener changes the installation position according to the vehicle type, is measured and input through the key input unit 8, and the rear speaker 12 and The distance from the listener is measured and input through the key input unit 8. Then, the digital signal processor 6 calculates the delayed output time of the speaker by converting the data input through the key input unit 8. At this time, the audio signal of both channels input through the A / D converter 5 is input, and the input audio signal is the audio signal of the front speaker or the rear speaker as much as the time converted by the digital signal processor 6. ) Is temporarily saved after the delay.

Here, when the data inputted to the key input unit 8 is greater than the distance between the listener and the rear speaker 12, the distance between the front speaker 11 and the listener is greater than the converted delay time (m / Sec). The audio signal from the speaker 11 is delayed out. That is, the voice frequency processed by the audio amplifier 10 is delayed according to the time stored in the memory 7. Therefore, the sound output from the front speaker 11 and the rear speaker 12 does not interfere with each other so that the listener can feel the maximum sound effect.

Meanwhile, referring to the speaker output time setting method according to the speaker mounting position, as shown in FIG. 2, the front speaker distance in which the listener measures the distance between the front speaker and the listener position in the initialization state S1 and inputs a value thereof. Proceeding to the input step (S2) and proceeds to the rear speaker distance input step (S3) for measuring the distance between the rear speaker and the listener position and input the measured value. Then, in this rear speaker distance measuring step (S3), data obtained by dividing the absolute value difference between the distance measured value (Y) between the rear speaker and the listener and the previously measured distance (X) between the front speaker and the listener's position by the sound wave speed Proceeds to the measurement data storage step (S4) for storing (Z). Then, the measurement data storage step (S4) proceeds to the speaker measurement value size determination step (S5) comparing the magnitude of the currently measured front speaker measurement value (X) and the rear speaker measurement value (Y). Then, if the distance measured between the front speaker and the listener is judged to be large in the speaker measurement value size determination step (S5), the rear speaker delay output step of delaying the output of the rear speaker by the measured data (Z msec) and outputting the If it is determined that the measured distance value between the rear speaker and the listener is large, the output of the front speaker is delayed by the measured data (Z msec). It proceeds to the front speaker delay output step (S7) to output and end.

As described above, the present invention measures the position of the front and rear speakers installed in the vehicle and the distance between the listeners and inputs the corresponding distance difference data through the specific key of the key input unit. By reducing the distortion of sound caused by frequency cancellation and reinforcement, it is possible to enhance the sound listening effect of the listener.

Claims (1)

After measuring the distance between the front speaker and the listener and inputting the measured value (X), input the measured value (X) in this front speaker distance measured value input process. The rear speaker distance measurement value input process of measuring the distance and inputting the measured value (Y), and the rear speaker distance measurement value input process and the front speaker distance measurement value input process, respectively, When the speaker measurement value judging process comparing the data and the speaker measurement value judging process determine that the distance value (X) measured between the front speaker and the listener is large, the output of the rear speaker is output for a predetermined time (Z m / Sec). When the rear speaker delay output process is delayed and the loud speaker delay value is judged by the speaker measurement value size determination process, and the distance value Y measured between the rear speaker and the listener is large, the output of the front speaker is Time information (Z m / Sec) to output the front speaker output of the speaker output delay process car audio system which comprises a control method for a delay.