KR930017312A - Digital audio signal attenuation circuit - Google Patents

Digital audio signal attenuation circuit Download PDF

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Publication number
KR930017312A
KR930017312A KR1019920001550A KR920001550A KR930017312A KR 930017312 A KR930017312 A KR 930017312A KR 1019920001550 A KR1019920001550 A KR 1019920001550A KR 920001550 A KR920001550 A KR 920001550A KR 930017312 A KR930017312 A KR 930017312A
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KR
South Korea
Prior art keywords
signal
bit
output
digital
attenuation
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KR1019920001550A
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Korean (ko)
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KR940008739B1 (en
Inventor
이한상
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이헌조
주식회사 금성사
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Priority to KR1019920001550A priority Critical patent/KR940008739B1/en
Publication of KR930017312A publication Critical patent/KR930017312A/en
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Publication of KR940008739B1 publication Critical patent/KR940008739B1/en

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    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66Digital/analogue converters

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

본 발명은 디지탈 음성신호의 감쇠회로는 각종 디지탈 오디오 시스템에서 배속재생을 하거나 또는 외부에서 뮤팅 제어신호가 입력될 경우에 음성 신호의 출력레벨을 -12dB감쇠시켜 뮤팅시키는 것으로서 종래의 감쇠회로는 스위치를 사용하여 스위치의 절환시마다 스위칭 잡음신호가 출력되므로 사용자에게 많은 불쾌감을 주고, 또한 음성신호를 저항값에 따라 감쇠시켜 정확히 -12dB을 감쇠시키기 어려울 뿐만 아니라 온도 및 습도의 변화에 따라 저항값이 변동될 경우에 감쇠량이 변동되는 등의 문제점이 있었다.According to the present invention, a digital audio signal attenuation circuit mutes the digital audio signal by a -12 dB attenuation when double speed playback is performed in various digital audio systems or when a muting control signal is input from the outside. The switching noise signal is output every time the switch is used, which gives a lot of discomfort to the user, and it is difficult to attenuate exactly -12dB by attenuating the voice signal according to the resistance value, and when the resistance value changes according to temperature and humidity There is a problem such that the amount of attenuation fluctuates.

본 발명은 디지탈 음성신호를 시프트시키고, 상위비트에 저전위를 삽입하여 출력함으로써 음성신호를 디지탈적으로 감쇠시켜 정확히 -12dB 감쇠시킬 수 있다.The present invention can digitally attenuate a voice signal by shifting the digital voice signal and inserting a low potential into an upper bit to output attenuated exactly -12 dB.

Description

디지탈 음성신호의 감쇠회로Digital audio signal attenuation circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명의 감쇠회로를 보인 블록도. 제3도는 제2도의 감쇠회로를 보인 블록도. 제4도는 제2도의 감쇠회로의 상세회로도.2 is a block diagram showing an attenuation circuit of the present invention. 3 is a block diagram showing the attenuation circuit of FIG. 4 is a detailed circuit diagram of the attenuation circuit of FIG.

Claims (2)

발진하여 클럭신호(fs, 64fs, 128fs)를 발생하는 클럭발생부(11)와, 입력되는 아날로그 신호(AI)를 상기 클럭신호(fs)에따라 16비트 디지탈 신호로 변환하는 아날로그/디지탈 변화기(12)와, 상위비트 제어신호(UPLD) 및 하위비트 제어신호(LOLD)에 따라 상기 아날로그/디지탈 변화기(12)의 출력신호를 저장 및 8비트로 출력하는 메모리(13)와, 상기 클럭신호(64fs, 128fs)에 따라 상기 메모리(13)로 상위비트 및 하위비트 제어신호(UPLD)(LOLD)를 출력함과 아울러 메모리(13)가출력하는 8비트 디지탈신호(DI)를 16비트로 변환하여 출력 및 감쇠신호(ATT)에 따라 감쇠시켜 출력하는 감쇠부(14)와, 상기 감쇠부(14)의 출력 디지탈 신호(DO)를 상기 클럭신호(fs)에 따라 아날로그 신호(AO)로 변환 출력하는 디지탈/아날로그변환기(15)로 구성함을 특징으로 하는 디지탈음성신호의 감소회로.A clock generator 11 that oscillates to generate clock signals fs, 64fs, and 128fs, and an analog / digital converter for converting the input analog signal AI into a 16-bit digital signal in accordance with the clock signal fs ( 12), a memory 13 for storing and outputting the output signal of the analog / digital converter 12 in 8 bits according to the upper bit control signal UPLD and the lower bit control signal LOLD, and the clock signal 64fs. And outputs the upper and lower bit control signals UPLD and LOLD to the memory 13 according to 128 fs, and converts the 8-bit digital signal DI output from the memory 13 into 16 bits. An attenuator 14 for attenuating and outputting the attenuated signal ATT and a digital output for converting the output digital signal DO of the attenuator 14 into an analog signal AO according to the clock signal fs. A digital audio signal reduction circuit comprising: an analog converter (15). 제1항에 있어서, 감쇠부(14)는 클럭신호(64fs, 128fs) 및 감쇠신호(ATT)에 따라 상위비트 제어신호(UPLD), 하위비트 제어신호(LOLD), 상위비트 클럭신호(UPCK), 하위비트 클럭신호(LOCK),데이타변환 클럭신호(DTCK)및 출력 클럭신호(OTCK)를 출력함과 아울러 감쇠제어신호(ATEN)를 출력하는 타이밍 제어부(21)와, 상기제어신호(UPLD, LOLD) 및 클럭신호(UPCK,LOCK,DTCK)에 따라 8비트 디지탈 신호(DI)를 16비트로 변환하여 직렬 출력하는 16비트 변환부(22)와, 상기 16비트변환부(22)의 출력신호를 통과시킴과 아울러 감쇠제어신호(ATEN)에 따라 상위 비트에 0비트를 추가하여 감쇠 출력하는 0비트 추가부(23)와, 상기 0비트 추가부(23)의 출력 신호를 상기 출력신호(OTCK)에 따라 출력하는 출력 레지스터(24)로 구성함을 특징으로 하는 디지탈 음성신호의 감쇠회로.The attenuation unit 14 according to claim 1, wherein the attenuation unit 14 includes a higher bit control signal UPLD, a lower bit control signal LOLD, and an upper bit clock signal UPCK according to the clock signals 64fs and 128fs and the attenuation signal ATT. A timing controller 21 for outputting the lower bit clock signal LOCK, the data conversion clock signal DTCK, and the output clock signal OTCK, and outputting the attenuation control signal ATEN, and the control signal UPLD, A 16-bit converter 22 for converting an 8-bit digital signal DI into 16 bits and outputting the serial signal in accordance with LOLD) and a clock signal (UPCK, LOCK, DTCK) and the output signal of the 16-bit converter 22. A 0-bit adder 23 for attenuating and adding 0 bits to the upper bits according to the attenuation control signal ATEN and passing the output signal of the 0-bit adder 23 to the output signal OTCK. An attenuation circuit for a digital audio signal, characterized in that it comprises an output register (24) for outputting in accordance with. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920001550A 1992-01-31 1992-01-31 Atenuation circuit of digital voice signal KR940008739B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920001550A KR940008739B1 (en) 1992-01-31 1992-01-31 Atenuation circuit of digital voice signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920001550A KR940008739B1 (en) 1992-01-31 1992-01-31 Atenuation circuit of digital voice signal

Publications (2)

Publication Number Publication Date
KR930017312A true KR930017312A (en) 1993-08-30
KR940008739B1 KR940008739B1 (en) 1994-09-26

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Application Number Title Priority Date Filing Date
KR1019920001550A KR940008739B1 (en) 1992-01-31 1992-01-31 Atenuation circuit of digital voice signal

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KR940008739B1 (en) 1994-09-26

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