KR910002115Y1 - Recording/revival common use audio circuits of digital audio tape recorder - Google Patents
Recording/revival common use audio circuits of digital audio tape recorder Download PDFInfo
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- KR910002115Y1 KR910002115Y1 KR2019870013742U KR870013742U KR910002115Y1 KR 910002115 Y1 KR910002115 Y1 KR 910002115Y1 KR 2019870013742 U KR2019870013742 U KR 2019870013742U KR 870013742 U KR870013742 U KR 870013742U KR 910002115 Y1 KR910002115 Y1 KR 910002115Y1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/09—Digital recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/026—Control of operating function, e.g. switching from recording to reproducing by using processor, e.g. microcomputer
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- Computer Hardware Design (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
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Description
제1도는 종래의 녹음/재생이 분리된 아날로그 오디오 회로의 블럭도.1 is a block diagram of an analog audio circuit in which conventional recording / playback is separated.
제2도는 본 고안의 녹음/재생 공용 오디오회로의 블럭도.2 is a block diagram of a recording / playback common audio circuit of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
2, 19 : 녹음레벨조정볼륨 3, 5, 15, 20, 25 : 증폭기2, 19: Recording level adjustment volume 3, 5, 15, 20, 25: Amplifier
4, 12, 22 : 저역통과필터 6, 27 : 샘플앤드호울드회로4, 12, 22: low pass filter 6, 27: sample and loop circuit
7, 28 : 아나로그/디지탈변환기 10, 31 : 디지탈필터7, 28: analog / digital converter 10, 31: digital filter
11, 32 : 디지탈/아날로그변환기 14, 24 : 디엠퍼시스회로11, 32: digital / analog converter 14, 24: deemphasis circuit
13, 16, 21, 23, 26 : 멀티플렉서13, 16, 21, 23, 26: multiplexer
본 고안은 디지탈 오디오 테이프레코오더에 있어서, 마이크로컴퓨터로 부터 콘트롤 신호를 받는 멀티플렉서의 스위칭동작을 이용하여 녹음/재생시 오디오회로를 공유할 수 있는 디지탈 오디오 테이프레코오더의 녹음/재생공용 오디오 회로에 관한 것이다.The present invention is a digital audio tape recorder in which digital audio tape recorders can share audio circuits during recording and playback using a switching operation of a multiplexer that receives a control signal from a microcomputer. It is about.
제1도에 도시된 바와같이, 종래에는 녹음시와 재생시 각각 분리된 오디오회로를 구성하였다.As shown in FIG. 1, in the related art, separate audio circuits are constructed during recording and playback.
녹음시에는 아날로그 입력신호(1)가 녹음레벨조정볼륨(2)에 의해 조절되어 증폭기(3)에서 증폭되고, 증폭신호중 음악신호에 불필요한 주파수성분신호를 저역통과 필터(4)를 통해 제거한 후 다시 증폭기(5)를 통해 증폭하며, 증폭된 아날로그 신호는 샘플앤드호울드회로(6)에서 일정한 시간율로 샘플링되어 아날로그/디지탈변환기(7)에 인가되고, 샘플링된 신호는 16비트의 디지탈 데이터(8)로 부호화되어 신호처리들 통해 테이프에 기록된다.During recording, the analog input signal (1) is controlled by the recording level adjusting volume (2) and amplified by the amplifier (3), and the frequency component signals unnecessary for the music signal of the amplified signals are removed through the low pass filter (4). Amplified by the amplifier (5), the amplified analog signal is sampled at a constant time rate in the sample and holder circuit (6) and applied to the analog / digital converter (7), and the sampled signal is a 16-bit digital data ( 8) is encoded and recorded on the tape through signal processing.
재생시에는 테이프로부터 읽어낸 디지탈데이터(9)가 신호보간등의 기능을 수행하고 에러를 정정하는 디지탈필터(10)를 통해 디지탈/아날로그변환기(11)에 인가되어 디지탈/아날로그변환기(11)는 아날로그신호를 출력하고, 디지탈/아날로그변환기(11)의 출력신호중 포함되어 있는 계단파 모양의 고주파성분이 저역통과필터(12)를 통해 제거되어 음악신호에 적합한 아날로그신호로 되며, 저역통과필터(12)의 출력신호는 디엠퍼시스(DeFmphasis)용 멀티플렉서(13)와 디엠퍼시스회로(14)를 통해 증폭기(15)에 인가되어 증폭된후 출력뮤트용 멀티플렉서(16)를 통해 출력된다.At the time of reproduction, the digital data 9 read from the tape is applied to the digital / analog converter 11 through the digital filter 10 which performs a function such as signal interpolation and corrects an error, so that the digital / analog converter 11 is analog. A signal is output and a stepped high frequency component included in the output signal of the digital / analog converter 11 is removed through the low pass filter 12 to become an analog signal suitable for a music signal, and the low pass filter 12 The output signal is applied to the amplifier 15 through the de-emphasis multiplexer 13 and the de-emphasis circuit 14 to be amplified and then output through the output mute multiplexer 16.
상기한 회로는 녹음/재생시 각각 별도의 저역통과필터 및 증폭기를 사용하여 원가적인 면에서 경제성을 기대할 수 없으며, 특히, 원음의 재생이 충실하도록 설계되는 디지탈 오디오 시스템에서는 연산증폭기, 저항, 콘덴서 등을 이용하여 디스크리트(Discretc)하게 필터를 구성할 경우 시스템에 적용하기 어렵기 때문에 디지탈 오디오시스템에서는 9차이상의 필터자수를 갖고 차단주파수의 특성이 예민한 고가의 필터를 사용해야만 하는 문제점이 있었다.The above circuit cannot be expected to be economical in terms of cost by using separate low pass filters and amplifiers for recording and playback. In particular, in a digital audio system designed to faithfully reproduce the original sound, an operational amplifier, a resistor, a capacitor, etc. In the case of using Discrete filter, it is difficult to apply the filter to the system. Therefore, in the digital audio system, there is a problem in that an expensive filter having a filter number of 9 or more orders and a sensitive cutoff frequency is used.
본 고안은 상기한 문제점을 해결하기 위해 안출된 것으로써, 마이크로컴퓨터의 콘트롤신호를 받는 멀티블렉서의 절환작용을 이용하여 저역통과필터와 증폭기등 오디오 회로를 녹음, 재생모드중 원하는 상태로 절환할수 있는 디지탈 오디오 테이프 레코오더의 녹음/재생 공용 오디오회로를 제공하는 것이 그 목적이다.The present invention was devised to solve the above problems, and can switch audio circuits such as a low pass filter and an amplifier to a desired state during recording and playback mode by using a switching function of a multiplexer that receives a control signal of a microcomputer. The purpose is to provide a common audio circuit for recording / playback of a digital audio tape recorder.
이하에 첨부된 도면을 참조하여 본 고안의 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 고안의 회로도가 도시된 제2도를 참조하면, 디지탈 오디오 테이프 레코오더의 녹음/재생공용 회로는 라인입력(18)이 녹음레벨 조정볼륨(19)에 의해 조절되어 연산증폭기(20)를 통해 멀티플렉서(21)의 한 입력에 인가되도록 연결하고, 테이프에서 읽어낸 재생 디지탈 데이터(30)가 디지탈 필터(31) 및 디지탈 아날로그변환기(32)를 통해 녹음/재생선택용 멀티플렉서(21)의 다른 입력에 인가되도록 연결되며, 멀티플렉서(21)는 저역통과필터(22)와 디엠퍼시스용 멀티플렉서(23)와 디엠퍼시스회로(24)를 통해 증폭기(25)에 연결되고, 증폭기(25)의 출력은 라인 출력 뮤트용 멀티플렉서(26)를 통해 라인출력(32)됨과 동시에 샘플앤드호울드회로(27)에 연결되며, 샘플앤드호울드(27)의 출력은 아날로그디지탈변환기(28)를 통해 디지탈로 변환되어 디지탈데이타(29)가 출력되도록 연결되었다.Referring to FIG. 2, which is a circuit diagram of the present invention, a circuit for recording / playback of a digital audio tape recorder is provided through the operational amplifier 20 in which the line input 18 is adjusted by the recording level adjusting volume 19. FIG. Connected to one input of the multiplexer 21, the playback digital data 30 read from the tape is input to the other input of the multiplexer 21 for recording / playback selection through the digital filter 31 and the digital analog converter 32. The multiplexer 21 is connected to the amplifier 25 through the low pass filter 22, the de-emphasis multiplexer 23, and the de-emphasis circuit 24, and the output of the amplifier 25 is connected to the line. The output mute multiplexer 26 is connected to the line output 32 and at the same time connected to the sample and the holder circuit 27, the output of the sample and the holder 27 is converted into a digital through an analog digital converter 28 Digital data (29) is output Lock was connected.
녹음하기 위한 파인입력신호(18)는 녹음레벨조정볼륨(19)으로 조절된 후 증폭기(20)를 통해 증폭되어 녹음재생선택용 멀티플렉서(21)의 한 입력에 입력되고, 테이프에서 읽어들인 재생디지탈 데이타(30)가 디지탈필터(31)와 디지탈 아날로그 변환기(32)를 통해 멀티플렉서(22)의 다른 입력에 인가되어, 멀티플렉서(21)는 마이크로컴퓨터에서 인가되는 콘트롤신호에 따라 재생신호나 녹음신호 둘중의 하나를 선택한다. 즉, 콘트롤신호가 하이상태(H)일때는 녹음모드가 되고, 로우상태(L)일때는 재생모드가 된다.The fine input signal 18 for recording is adjusted by the recording level adjusting volume 19 and then amplified by the amplifier 20 and input to one input of the multiplexer 21 for recording and playback selection, and read back from the tape. Data 30 is applied to the other input of the multiplexer 22 through the digital filter 31 and the digital analog converter 32, so that the multiplexer 21 is either a reproduction signal or a recording signal according to a control signal applied from the microcomputer. Choose one. In other words, when the control signal is in the high state (H), the recording mode is set. In the low state (L), it is the playback mode.
먼저, 마이크로컴퓨터에서 인가되는 콘트롤신호가 하이상태(H)일 경우 즉, 녹음모드인경우 멀티플렉서(21)는 증폭기(20)를 통해 증폭된 녹음신호를 선택하고, 녹음신호중 음악신호에 불필요한 주파수성분의 신호는 저역통과필터(22)에서 차단되며, 대역제한돈 녹음신호는 디엠퍼시스용 멀티플렉서(23)와 디엠퍼시스회로(24)를 통해 증폭기(25)에 인가되어 증폭되어 신호감쇄가 보상된다.First, when the control signal applied from the microcomputer is in the high state (H), that is, in the recording mode, the multiplexer 21 selects the recording signal amplified by the amplifier 20, and unnecessary frequency components of the music signal among the recording signals. The signal is blocked by the low pass filter 22, and the band-limited recording signal is applied to the amplifier 25 through the de-emphasis multiplexer 23 and the de-emphasis circuit 24 and amplified to compensate for signal attenuation.
디엠퍼시스용 멀티플렉서(22)는 저역통과필터(22)에서 대역제한된 신호에 디엠퍼시스회로(24)의 적용부를 선택하는 역할을 하나, 녹음시에는 불필요하고 타인출력뮤트용 멀티플렉서(26)는 증폭기(25)에서 증폭된 신호를 받아 라인출력을 내보낼 것인가를 선택하는 역할을 한다.The de-emphasis multiplexer 22 selects the application portion of the de-emphasis circuit 24 to the band-limited signal from the low pass filter 22, but is unnecessary during recording and the multiplexer 26 for tine output mute is an amplifier ( It receives the amplified signal in 25) and selects whether to output the line output.
증폭기(25)에서 증폭된 신호는 매플앤드호울드회로(27)에서 표본화된 후 아나로그디지탈변환기(28)에 인가되어 디지탈 데이터(9)로 부호화되고, 이 디지탈 데이터(29)는 신호처리과정을 통해 테이프에 기록된다.The signal amplified by the amplifier 25 is sampled by the muffle and holder circuit 27 and then applied to the analog digital converter 28 to be encoded into the digital data 9, and the digital data 29 is subjected to a signal processing process. Is written to tape through.
다음에, 재생시 즉, 콘트롤신호가 로우상태(L)인 경우 멀티플렉서(21)는 재생뎅터를 선택하게 된다.Next, when reproducing, i.e., when the control signal is in the low state (L), the multiplexer 21 selects the reproduction dentor.
테이프에서 읽어들인 디지탈 데이타(30)는 디지탈필터(31)에 입력되어 신호보간등의 에러정정을 하여 데이터가 보강된 후 디지탈/아놀로그 변환기(32)에 입력되고, 이때 디지탈/아날로그 변환기(32)를 통해 변환된 아날로그신호는 계단파모양의 고주과성분이 포함되어 있다. 아날로그신호는 멀티플렉서(21)에 인가되어 마이크로컴퓨터의 콘트롤신호에 의해 멀티플렉서(21) 출력으로 선택되고, 음악신호에 적합한 형태로 만들어 주기위해 저역통과필터(22)는 멀티플렉서(21)의 출력신호중 고주파 성분을 제거한다. 저역통과필터(22)의 출력신호가 프리앰퍼시스된 것이라고 판단되면 마이크로컴퓨터의 콘트를신호에 의해 멀티플렉서(23)가 동작하고, 저역통과필터(22)의 출력신호는 디엠퍼시스회로(24)에 인가되며, 디엠퍼시스회로(24)를 통과한 재생신호는 멀티플렉서(26)를 통해 뮤팅여부가 결정되어 라인 출력된다.The digital data 30 read out from the tape is input to the digital filter 31 to correct errors such as signal interpolation, and the data is reinforced and then input to the digital / analog converter 32, at which time the digital / analog converter 32 The analog signal converted by) contains a stepped wave-shaped high fruit component. The analog signal is applied to the multiplexer 21 to be selected as the multiplexer 21 output by the control signal of the microcomputer, and the low pass filter 22 is a high frequency of the output signals of the multiplexer 21 in order to make it suitable for the music signal. Remove the ingredients. When it is determined that the output signal of the low pass filter 22 is pre-emphasized, the multiplexer 23 operates by the control signal of the microcomputer, and the output signal of the low pass filter 22 is transmitted to the de-emphasis circuit 24. The reproduction signal passed through the de-emphasis circuit 24 is muted through the multiplexer 26 to output the line.
이때, 재생하려는 데이타가 프리앰퍼시스되기 않았으면 디앰퍼시스회로(24)는 버퍼역할만 수행하게 된다. 종래에는 녹음/재생시 별도의 오디오회로를 구성하여 원가적인 측면에서의 경제성을 고려할 수 없었으나, 본 고안에서는 마이크로컴퓨터부터 콘트롤 신호를 받는 멀티플렉서자체의 스위칭작용을 이용하여 녹음/재생시오디오회로를 공유하도록 설계하였으며, 필터등의 경제적인 부담을 상당히 감소시킬수 있다.At this time, if the data to be reproduced is not pre-emphasized, the de-emphasis circuit 24 performs only the buffer role. In the prior art, a separate audio circuit was formed during recording / playback, so it was not possible to consider the economics in terms of cost. However, in the present invention, the audio circuit is shared during recording / playback using a switching action of the multiplexer itself that receives a control signal from a microcomputer. It is designed to reduce the economic burden of filters.
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