KR950003804Y1 - Surround and wooper circuit - Google Patents

Abstract

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Description

Surround and woofer circuit using voice detection output

1 is a circuit diagram of a surround and woofer using a conventional voice detection output.

2 is a circuit diagram of a surround and woofer using the present invention speech detection output.

3A to 3D are each waveform diagram of FIG.

* Explanation of symbols for main parts of the drawings

2: Voice detection and demodulation circuit 4 ′: Voice tone control unit

8: surround speaker 10: surround and superwoofer circuitry

11: superwoofer speaker 12: main audio detector

13: low pass filter 14: negative audio detection unit

15: high pass filter

The present invention relates to a surround and woofer circuit using a voice detection output. In particular, the audio frequency (L, R, LR, L + R) output during the voice detection and demodulation process is used to directly adjust the sound frequency of the surround circuit. It is suitable for improving the regeneration effect.

The conventional surround circuit includes a voice detection and demodulation circuit section 2 for detecting an audio signal at an audio intermediate frequency output from the tuner and the audio intermediate frequency processing unit 1, as shown in FIG. 1, and an audio signal at an audio intermediate frequency. A microcomputer 3 for discriminating and controlling whether the audio is mono or stereo broadcasting, a voice tone control unit 4 for controlling voice tones of an audio signal output from the voice detection and demodulation circuit unit 2, and a voice tone control unit 4 In the speech multiplexing circuit composed of an audio output amplifier 5 for amplifying and outputting the audio signal controlled by the conventional audio multiple surround circuit, the audio signals L and R output from the audio output amplifier 5 are output. Amplified and output through the L speaker 6 and the R speaker (7). In general, a surround system through a speaker matrix connects the terminals (+) of the L speaker (6) and the terminals (+) of the R speaker (7) to each other. Audio signal (L , R) to make the difference signal (LR) and output through the surround speaker (8), and the high-frequency only by connecting the capacitor (C1) to the L speaker (6) or R speaker (7) respectively There is a method of outputting through a tweeter speaker 9 provided with a pass filter (HPF).

In another method, the audio signals L and R output from the voice tone control unit 4 are converted into a difference signal LR, and the delay difference signal d (LR) output through the delay and synthesis circuit unit 19 is used. The audio output amplification portion 5 outputs the audio signal L + the delay signal [d (LR)] and the audio signal R + the delay signal [d (LR)], respectively. There is a method of outputting the delay difference signal d (LR) output from the synthesis circuit unit 19 through the surround speaker 8 via the surround circuit of the surround and superwoofer circuit unit 10.

In addition, the audio signals L and R output from the voice tone control unit 4 are delayed, and the sum signal L + R is generated by the synthesis circuit unit 19 so that the super woofer circuit of the surround and superwoofer circuit unit 10 is removed. There is a method to output to the superwoofer speaker 11 through.

However, in order to drive the surround circuit, a conventional surround circuit must separately include a circuit for making an audio signal L and R into a difference signal LR or a sum signal L + R. ), The component of “0” is not output, and the tweeter speaker 9 equipped with the high pass filter (HPF) also reproduces only a portion of the sound range, not other frequencies, and thus does not have a normal surround sound quality. There was this.

The present invention improves sound quality by faithfully reproducing the sound frequency of the surround circuit using audio signals (L, R, LR, L + R) output during voice detection and demodulation in order to solve such a conventional problem. It is possible to have a separate surround and superwoofer circuit is not necessary to describe the configuration and effect of the present invention by the accompanying drawings as follows.

First, the configuration of the present invention is a voice detection and demodulation circuit 2 for detecting an audio signal at the voice intermediate frequency output from the tuner and the voice intermediate frequency processing unit 1, as shown in FIG. A microcomputer 3 for determining whether the audio signal of the audio signal is mono broadcasting or stereo broadcasting, a voice tone control unit 4 for controlling the audio tone of the audio signal output from the voice detection and demodulation circuit 2, and a voice tone. A high pass filter connected to the L speaker 6 and the R speaker 7 and the terminal (+) of the L speaker 6 or the R speaker 7 by amplifying the audio signal controlled by the controller 4 is provided. Low-pass filtering the sum signal (L + R) output from the voice output amplifier (5) for outputting to the tweeter speakers (9, 9 ') and the main voice detector (12) of the voice detection and demodulation circuit (2). High-pass filtering the low-pass filter 13 and the difference signal L + R output from the sub-audio detector I4 A high pass filter 15 for controlling the sound tones of the sum signal L + R and the difference signal LR output from the low pass and high pass filter 13 and 15; And a surround and superwoofer circuit unit 10 'for amplifying the audio signal controlled by the voice tone control unit 4' and outputting it to the surround speaker 8 and the superwoofer speaker 11. A 4.5 MHz trap circuit, 17 is a 4.7 MHz trap circuit, 18 is a voice demodulation circuit section, R1 and R2 are resistors, and C1 to C8 are capacitors.

The operation and effect of the present invention configured as described above are shown in FIGS. 3 and 3 of FIGS. A through d, and the audio signals L and R of the voice intermediate frequency output from the tuner and the voice frequency processor 1 are It is output through the main audio detector 12 and the sub-audio detector 14 via the 4.5 MHz trap circuit 16 and the 4.7 MHz trap circuit 17 of the voice detection demodulation circuit section 2.

The output signal output as described above is a signal reproduced in an audible frequency band in which only a carrier wave is removed. When two languages are broadcast, the output signals of the main audio detector 12 and the sub-audio detector 14 are the main audio and the sub-audio. In the case of a signal and stereo, the output is demodulated to a frequency desired by the user in the voice demodulation circuit section 18 by a pilot signal for discriminating the signal as the sum signal L + R and the difference signal LR.

That is, the bilingual broadcast is output to the main audio detector 12 and the sub-audio detector 14 to the main voice and the sub-audio, and the stereo broadcast is the sum signal (L + R) of the voice demodulation circuit 18 The L channel signal = [sum signal L + R + difference signal LR] / 2 → L signal is generated by the difference signal LR circuit as shown in a diagram in FIG. 3, and the R channel signal = [sum signal L]. + R) -difference signal LR] / 2 → R signals are generated as shown in FIG.

The output waveforms of the sum signal L + R and the difference signal LR generated as described above are generated as shown in degrees C and d of FIG. 3, and the existing surround circuit is an audio signal output from the voice demodulation circuit 18. The sum signal L + R, the difference signal LR, the delay sum signal [d (L + R)] and the delay difference signal [d (LR)], etc., due to external time delay circuits from (L, R). Make and use it.

Therefore, the audio signal LR output from the voice demodulation circuit unit 18 is controlled by the voice tone control unit 4 which controls the voice tone, and is then amplified by the voice output amplifying unit 4 so that the L speaker 6 ) And R speaker 7 and tweeper speakers 9 and 9 'connected to their respective terminals (+).

On the other hand, the sum signal L + R and the difference signal LR output from the main audio detector 12 and the sub-audio detector 14 of the voice detection and demodulation circuit section 2 are the low pass filter section 13, respectively. The high tone, low tone, left / right balance, and volume are controlled by the voice tone control unit 4 'via the high-pass filter unit 15.

As such, the sum signal L + R and the difference signal LR in which the voice tone is controlled are amplified to a user's audible range by the surround superwoofer circuit unit 10 ', so that the surround speaker 8 and the superwoofer speaker ( 11) is output.

In the case of two-language broadcasting, the microcomputer 3 determines the current broadcasting state and supplies a mute (muting) signal to the voice tone control unit 4 'to mute the voice tone control unit 4' to control the left and right channels. Blocking control is performed so that the synthesized (L + R, LR) signals of different languages shown in (L / R) are not output to the speakers 9, 9 '.

As described above, according to the present invention, the audio signal is directly output by the main voice detector and the negative voice detector of the voice detection and demodulation circuit unit in the bilingual broadcast, and the main voice detector and the negative voice detector in the case of stereo broadcasting. The sum / difference signal of is output through the low pass filter and the high pass filter to surround sound and super woofer speaker, so the user can see the sound and improve the performance and quality of the product.

Claims (1)

A low pass filter 13 for low-pass filtering the sum signal L + R output from the main audio detector 12 of the voice detection and demodulation circuit 2 when receiving stereo or mono broadcast; A high pass filter 15 for high pass filtering the difference signal LR output from 14 and a sum signal L + R and a difference signal LR output from the low pass and high pass filter parts 13 and 15. Voice composed of a voice tone control unit 4 'for controlling voice tones, and a surround and superwoofer circuit unit 10' for amplifying the controlled voice to be output to the surround speaker 8 and the superwoofer speaker 11; Surround and woofer circuit with detection output.