KR20000040199A - Ac-3 audio system for pulse code modulation audio signals - Google Patents

Ac-3 audio system for pulse code modulation audio signals Download PDF

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KR20000040199A
KR20000040199A KR1019980055770A KR19980055770A KR20000040199A KR 20000040199 A KR20000040199 A KR 20000040199A KR 1019980055770 A KR1019980055770 A KR 1019980055770A KR 19980055770 A KR19980055770 A KR 19980055770A KR 20000040199 A KR20000040199 A KR 20000040199A
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audio
signal
digital
signals
channel
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KR1019980055770A
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Korean (ko)
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박인식
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윤종용
삼성전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/005—Correction of errors induced by the transmission channel, if related to the coding algorithm
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements

Abstract

PURPOSE: An AC-3 audio system for PCM(Pulse Code Modulation) audio signals is provided to downmix the audio signal converted with 5.1 channels and output the result as a digital signal. CONSTITUTION: An AC-3 audio system for pulse width modulation audio signals includes an AC-3 audio decoder(10), a downmixer(20), a selector(50), a digital output format(40), and a controller(60). The AC-3 audio decoder(10) compresses the input audio bit stream signals into an AC-3 it stream signals, and decodes the result audio bit stream signal with 5.1 channel signal. The downmixer(20) combines two channels of the 5.1 channel signals, and outputs the overall digital audio signal combining all 5.1 channel signals. The selector(50) selects one of the overall digital audio signal and a compressed AC-3 bit stream signals. The digital output format(40) converts the selected signal into a digital format. The controller(60) controls the selector to select the signal of user's preference.

Description

ＰＣＭ오디오신호를 위한 ＡＣ-3오디오시스템AC-3 Audio System for PCM Audio Signals

본 발명은 AC-3방식을 적용하는 디지털TV의 오디오장치에 관한 것으로, 특히 AC-3방식으로 압축된 오디오신호를 PCM(펄스코드변조)방식의 녹음이 가능하도록 한 PCM오디오신호를 위한 AC-3오디오시스템에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio device of a digital TV applying the AC-3 method, and more particularly, to an AC-system for a PCM audio signal capable of recording a PCM (pulse code modulation) method. 3 audio system.

종래의 디지털TV는 AC-3방식으로 압축된 오디오신호를 출력함에 따라 기존의 PCM방식에 적용되는 레코더로는 녹음이 불가능하였다.Conventional digital TVs output audio signals compressed by the AC-3 method, and thus recording is not possible with a recorder applied to the conventional PCM method.

도 1은 종래의 AC-3오디오시스템을 보여주는 도면이다. 종래의 오디오장치는 오디오 비트스트림을 입력받는 AC-3오디오디코더(10)를 포함한다. AC-3오디오디코더(10)의 후단에는 다운믹서(20)와 디지털출력포맷부(40)가 연결된다. AC-3 오디오디코더(10)는 오디오비트스트림신호를 디코딩하여 5.1채널신호를 출력한다. 여기서, 5.1채널 오디오신호는 좌, 우측채널(L, R)에 중심채널(C) 및 2개의 서라운드채널(Ls, Rs)을 포함한다. 또한, 중심채널(C) 근처에는 15㎐부터 120㎐까지의 범위에 있는 오디오신호를 처리할 수 있는 저주파강화채널(Low Frequency Enhancement; Lfe)을 추가로 포함한다. 다운믹서(20)는 AC-3오디오디코더(10)로부터 입력되는 5.1채널(L, R, C, Ls, Rs, Lfe)을 2채널씩(L+R, C+Lfe, Ls+Rs) 합성하여 디지털/아날로그 변환부(DAC)(30)로 출력한다. DAC(30)는 2채널로 변환된 PCM오디오신호(디지탈신호)를 아날로그신호로 변환하여 출력한다. 즉, 아날로그 5.1채널(L, R, C, Lfe, Ls, Rs)신호로 각각 출력한다. 또한, AC-3오디오디코더(10)는 오디오비트스트림신호로부터 필요한 데이터를 추출하여 AC-3규격에 맞도록 압축한 AC-3비트스트림신호를 디지털출력포맷터(40)로 출력한다. 디지털출력포맷터(40)는 압축된 AC-3비트스트림신호를 출력가능한 포맷으로 변환한다.1 is a view showing a conventional AC-3 audio system. The conventional audio device includes an AC-3 audio decoder 10 for receiving an audio bitstream. The down mixer 20 and the digital output format unit 40 are connected to the rear end of the AC-3 audio decoder 10. The AC-3 audio decoder 10 decodes the audio bitstream signal and outputs a 5.1 channel signal. Here, the 5.1-channel audio signal includes a center channel C and two surround channels Ls and Rs in the left and right channels L and R. In addition, near the center channel (C) further includes a low frequency enhancement channel (Lfe) capable of processing audio signals in the range from 15 kHz to 120 kHz. The downmixer 20 synthesizes 5.1 channels (L, R, C, Ls, Rs, Lfe) input from the AC-3 audio decoder 10 by 2 channels (L + R, C + Lfe, Ls + Rs). To the digital-to-analog converter (DAC) 30. The DAC 30 converts the PCM audio signal (digital signal) converted into two channels into an analog signal and outputs it. That is, they are output as analog 5.1 channel (L, R, C, Lfe, Ls, Rs) signals, respectively. In addition, the AC-3 audio decoder 10 extracts necessary data from the audio bitstream signal and outputs the AC-3 bitstream signal compressed to the AC-3 standard to the digital output formatter 40. The digital output formatter 40 converts the compressed AC-3 bit stream signal into an outputable format.

그러나, 위와같은 현재의 AC-3오디오시스템에서는 압축된 AC-3비트스트림신호는 외부 디지털기기로는 녹음이 불가능하다. 즉, 일반적으로 디지털신호를 녹음하는 방식인 펄스부호변조(PCM; Pulse Code Modulation)방식을 갖는 오디오 레코더 예를들어, 디지털테이프(DAT; Digital Audio Tape)레코더 또는 MD(Mini Disk)레코더등으로는 녹음이 불가능하였다.However, in the current AC-3 audio system as described above, a compressed AC-3 bit stream signal cannot be recorded by an external digital device. That is, an audio recorder having a pulse code modulation (PCM) method, which generally records digital signals, for example, a digital audio tape (DAT) recorder or an MD (Mini Disk) recorder, etc. Recording was not possible.

따라서, 본 발명의 목적은 위와같은 문제점을 해결하기 위해, AC-3오디오장치에서 5.1채널로 변환된 디지털 오디오신호를 2채널로 다운믹서하여 디지털 오디오신호로 출력하는 PCM오디오신호의 출력을 위한 AC-3오디오시스템을 제공함에 있다.Accordingly, an object of the present invention is to provide an AC for outputting a PCM audio signal which downmixes a digital audio signal converted into 5.1 channel in an AC-3 audio device to 2 channels and outputs it as a digital audio signal. -3 to provide an audio system.

도 1은 종래의 AC-3오디오시스템을 보여주는 도면,1 is a view showing a conventional AC-3 audio system,

도 2는 본 발명의 바람직한 일 실시예에 따른 PCM오디오신호를 위한 AC-3오디오시스템을 보여주는 도면.2 is a diagram showing an AC-3 audio system for a PCM audio signal according to an embodiment of the present invention.

※ 도면의 주요 부분에 대한 부호의 설명※ Explanation of codes for main parts of drawing

10 : AC-3오디오디코더 20 : 다운믹서10: AC-3 Audio Encoder 20: Down Mixer

30 : DAC 40 : 디지탈출력포맷부30: DAC 40: Digital Output Format

50 : 선택부 60 : 제어부50: selection unit 60: control unit

위와같은 목적을 달성하기 위한 본 발명의 특징은 디지털TV의 오디오시스템에 있어서, 입력되는 오디오비트스트림신호를 AC-3방식에 맞도록 AC-3비트스트림신호로 압축하여 출력하고, 상기 오디오비트스트림신호를 5.1채널신호로 디코딩하는 AC-3오디오디코더, 상기 5.1채널신호를 두채널씩 합성하여 출력하며, 상기 5.1채널신호를 모두 합성한 전체 디지털오디오신호를 출력하는 다운믹서, 상기 AC-3오디오디코더로부터의 압축된 AC-3비트스트림신호와 상기 다운믹서로부터의 전체 디지털오디오신호중 하나를 선택하는 선택부, 상기 선택부에서 선택된 신호를 외부기기로 전송가능한 디지탈출력형태로 변환하는 디지털출력포맷부 및 사용자의 선택에 해당하는 신호를 상기 선택부에서 선택하도록 제어하는 제어부를 포함한 PCM오디오신호의 출력을 위한 AC-3오디오시스템에 있다.A feature of the present invention for achieving the above object is, in the audio system of a digital TV, the audio bit stream signal is input to the AC-3 bit stream signal to be output according to the AC-3 method, the audio bit stream An AC-3 audio decoder for decoding the signal into a 5.1 channel signal, a down mixer for synthesizing the 5.1 channel signal by two channels, and outputting a total digital audio signal synthesized with all of the 5.1 channel signals, and the AC-3 audio signal A selector for selecting one of the compressed AC-3 bit stream signal from the decoder and the entire digital audio signal from the downmixer, and a digital output format unit for converting the signal selected by the selector into a digital output form that can be transmitted to an external device And a controller for controlling a signal corresponding to the user's selection to be selected by the selection unit. 3 is in the audio system.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 일 실시예를 상세히 설명하겠다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 바람직한 일 실시예에 따른 PCM오디오신호의 출력을 위한 AC-3방식의 오디오장치를 보여주는 도면이다.2 is a view showing an AC-3 type audio device for outputting a PCM audio signal according to an embodiment of the present invention.

본 발명의 AC-3오디오디코더(10)는 입력되는 오디오 비트스트림신호중 필요한 데이터를 추출하여 AC-3방식으로 압축한 AC-3비트스트림신호 및 입력되는 오디오 비트스트림신호를 디코딩한 5.1채널신호를 출력한다. 다운믹서(20)는 5.1채널을 입력받아 두채널씩 합성한 디지털신호를 각각 출력한다. 즉, 다운믹서(20)는 5.1채널(L, R, C, Ls, Rs, Lfe)을 입력받아 2채널신호(L+R, C+Lfe, Ls+Rs)로 다운믹스하여 DAC(30)로 출력한다. 또한, 5.1채널신호(L, R, C, Ls, Rs, Lfe)를 모두 합성한 전체 디지탈오디오신호(Lt+Rt)를 출력한다. 다운믹서(20)와 AC-3오디오디코더(10)의 출력단에는 선택부(50)가 연결된다. 선택부(50)는 제어부(60)로부터의 제어신호에 따라 AC-3오디오디코더(10)로부터의 압축된 AC-3비트스트림신호와 다운믹서(20)로부터의 전체 디지털오디오신호(Lt+Rt)중 하나를 선택한다. 선택된 신호는 디지털출력포맷부(40)로 인가된다. 디지털출력포맷부(40)는 선택부(50)로부터 압축된 AC-3비트스트림신호를 입력받으면, AC-3오디오신호에 대응하는 출력포맷으로 변환하여 출력한다. 또한, 디지털출력포맷부(40)는 선택부(50)로부터 5.1채널이 모두 합성된 전체 디지탈오디오신호(Lt+Rt)를 입력받으면, 이에 대응하는 출력포맷으로 변환하여 출력한다. 실시예에서, 디지털출력포맷부(40)는 주로 IC958을 사용한다. 디지털출력포맷부(40)에는 외부 디지털기기 즉, 펄스부호변조(PCM; Pulse Code Modulation)방식을 갖는 오디오 레코더 즉, 디지털테이프(DAT; Digital Audio Tape)레코더 또는 MD(Mini Disk)레코더가 연결될 수 있으며, 5.1채널이 모두 합성된 전체 디지털오디오신호(Lt+Rt)를 입력받아 녹음이 가능하다.The AC-3 audio decoder 10 of the present invention extracts necessary data from the input audio bitstream signal and compresses the AC-3 bitstream signal compressed by the AC-3 method and the 5.1 channel signal decoded the input audio bitstream signal. Output The down mixer 20 receives 5.1 channels and outputs digital signals synthesized by two channels. That is, the downmixer 20 receives 5.1 channels (L, R, C, Ls, Rs, Lfe) and downmixes the two channel signals (L + R, C + Lfe, Ls + Rs) to the DAC 30. Will output Further, the entire digital audio signal Lt + Rt, which is a combination of all 5.1 channel signals L, R, C, Ls, Rs, and Lfe, is output. The selector 50 is connected to the down mixer 20 and the output terminal of the AC-3 audio decoder 10. The selector 50 controls the compressed AC-3 bitstream signal from the AC-3 audio coder 10 and the entire digital audio signal Lt + Rt from the downmixer 20 according to the control signal from the control unit 60. Select one of the The selected signal is applied to the digital output format unit 40. When the digital output format unit 40 receives the compressed AC-3 bit stream signal from the selector 50, the digital output format unit 40 converts the output signal into an output format corresponding to the AC-3 audio signal. In addition, when the digital output format unit 40 receives the entire digital audio signal Lt + Rt obtained by synthesizing all 5.1 channels from the selector 50, the digital output format unit 40 converts the output signal into a corresponding output format. In the embodiment, the digital output format unit 40 mainly uses IC958. The digital output format unit 40 may be connected to an external digital device, that is, an audio recorder having a pulse code modulation (PCM) method, that is, a digital audio tape (DAT) recorder or an MD (Mini Disk) recorder. In addition, it is possible to record by receiving the entire digital audio signal (Lt + Rt) synthesized with all 5.1 channels.

따라서, 본 발명의 장치는 디지털출력을 위한 AC-3방식 및 아날로그출력을 위한 PCM방식을 모두 수용하며, 사용자의 선택신호에 따라 두 방식중 어느 하나를 선택하여 해당 녹음기기로 오디오신호를 녹음할 수 있다.Therefore, the apparatus of the present invention accommodates both the AC-3 method for the digital output and the PCM method for the analog output, and selects one of the two methods according to the user's selection signal to record the audio signal with the corresponding recording device. Can be.

상술한 바와같이, 본 발명에 따른 디지털TV의 오디오장치는 압축된 AC-3비트스트림형태의 오디오신호를 출력함에 따라 기존의 PCM레코더로 녹음이 불가능하였던 단점을 개선한 것으로, 디코딩된 5.1채널신호를 모두 합성한 전체 디지탈오디오신호(Lt+Rt)를 선택함으로써 PCM녹음을 할 수 있는 효과가 있다.As described above, the audio device of the digital TV according to the present invention improves the disadvantage that recording with a conventional PCM recorder is impossible as the audio signal of the compressed AC-3 bit stream is output. By selecting all of the digital audio signals (Lt + Rt) synthesized together, there is an effect that PCM recording can be performed.

Claims (1)

디지털TV의 오디오시스템에 있어서,In audio system of digital TV, 입력되는 오디오비트스트림신호를 AC-3방식에 맞도록 AC-3비트스트림신호로 압축하여 출력하고, 상기 오디오비트스트림신호를 5.1채널신호로 디코딩하는 AC-3오디오디코더;An AC-3 audio decoder for compressing and outputting the input audio bitstream signal into an AC-3 bitstream signal in accordance with an AC-3 scheme, and decoding the audio bitstream signal into a 5.1 channel signal; 상기 5.1채널신호를 두채널씩 합성하여 출력하며, 상기 5.1채널신호를 모두 합성한 전체 디지털오디오신호를 출력하는 다운믹서;A down mixer for synthesizing the 5.1 channel signals by two channels and outputting all the digital audio signals synthesized with the 5.1 channel signals; 상기 AC-3오디오디코더로부터의 압축된 AC-3비트스트림신호와 상기 다운믹서로부터의 전체 디지털오디오신호중 하나를 선택하는 선택부;A selection unit for selecting one of a compressed AC-3 bitstream signal from the AC-3 audio encoder and a total digital audio signal from the downmixer; 상기 선택부에서 선택된 신호를 외부기기로 전송가능한 디지탈출력형태로 변환하는 디지털출력포맷부; 및A digital output format unit converting the signal selected by the selection unit into a digital output form transmittable to an external device; And 사용자의 선택에 해당하는 신호를 상기 선택부에서 선택하도록 제어하는 제어부를 포함한 PCM오디오신호의 출력을 위한 AC-3오디오시스템.AC-3 audio system for outputting a PCM audio signal including a control unit for controlling to select a signal corresponding to the user's selection in the selection unit.
KR1019980055770A 1998-12-17 1998-12-17 Ac-3 audio system for pulse code modulation audio signals KR20000040199A (en)

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KR101403682B1 (en) * 2007-12-13 2014-06-05 삼성전자주식회사 Image apparatus to transmit audio data and method thereof

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KR0185939B1 (en) * 1995-12-30 1999-04-15 김광호 Device for the audio signal reproduction of a digital video disc player
KR100195711B1 (en) * 1995-11-30 1999-06-15 전주범 A digital audio decoder

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KR100195711B1 (en) * 1995-11-30 1999-06-15 전주범 A digital audio decoder
KR0185939B1 (en) * 1995-12-30 1999-04-15 김광호 Device for the audio signal reproduction of a digital video disc player

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101403682B1 (en) * 2007-12-13 2014-06-05 삼성전자주식회사 Image apparatus to transmit audio data and method thereof

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