KR960002285A - Digital Modulation Method and Apparatus - Google Patents

Digital Modulation Method and Apparatus Download PDF

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Publication number
KR960002285A
KR960002285A KR1019940012525A KR19940012525A KR960002285A KR 960002285 A KR960002285 A KR 960002285A KR 1019940012525 A KR1019940012525 A KR 1019940012525A KR 19940012525 A KR19940012525 A KR 19940012525A KR 960002285 A KR960002285 A KR 960002285A
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KR
South Korea
Prior art keywords
codeword
inrzi
dsv
modulation
polarity
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KR1019940012525A
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Korean (ko)
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KR970010524B1 (en
Inventor
김순태
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김광호
삼성전자 주식회사
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Priority to KR1019940012525A priority Critical patent/KR970010524B1/en
Publication of KR960002285A publication Critical patent/KR960002285A/en
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Publication of KR970010524B1 publication Critical patent/KR970010524B1/en

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    • 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
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof

Abstract

본 발명은 부호어의 직류성분을 디지탈 변조방법 및 장치에 관한 것으로, 정보어의 최상위비트에 부가비트 '1'을 부가한 제1부호어와 0'을 부가한 제2부호어를 발생하는 제1단계; 제1 및 제2부호어의 기수코드에 대한 NRZL CDS를 각각 검출하는 제2단계; 현재의 INRZL DSV값의 극성이 정(+) 또는 부(-)인지의 여부를 판단하는 제3단계; 제3단계에서 INRZI DSV값이 극성이 정(+)이면 NRZI CDS의 극성이 부(-)인 부호어를 선택하고, 그렇지 않으면 NRZI CDS의 극성이 정(+)인 부호어를 선택하는 제4단계; 및 제4단계에서 선택된 부호어를 INRZI변조하는 제5단계를 포함함을 특징으로 한다.The present invention relates to a digital modulation method and apparatus for direct-current components of a codeword, and includes a first coder adding an additional bit '1' to a most significant bit of an information word and a first codeword generating a second codeword added with 0 '. step; Detecting each of the NRZL CDSs for the odd codes of the first and second codewords; Determining whether the polarity of the current INRZL DSV value is positive (+) or negative (-); A fourth step of selecting a codeword having a negative polarity of the NRZI CDS if the INRZI DSV value is positive in the third step; otherwise, selecting a codeword having a positive polarity of the NRZI CDS. step; And a fifth step of INRZI modulation of the codeword selected in the fourth step.

본 발명에 의하면, 정보어의 우스코드에 대한 CDS에 따라 부호어를 선택하므로써, INRZI변조파형의 DSV를 유한하게 제어하여 부호어의 직류성분을 억제할 수 있다.According to the present invention, by selecting the codeword according to the CDS for the information code of the information word, the DSV of the INRZI modulated waveform can be finitely controlled to suppress the DC component of the codeword.

Description

디지탈 변조방법 및 장치Digital Modulation Method and Apparatus

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제15도는 본 발명에 의한 디지탈변조방법을 설명하는 흐름도.15 is a flowchart for explaining a digital modulation method according to the present invention.

제16도는 본 발명에 의한 디지탈변조장치의 구성블럭도.16 is a block diagram of a digital modulator according to the present invention.

Claims (4)

정보어에 소정의 부가비트를 부가한 부호어를 INRZI변조하기 위한 디지탈 변조방법에 있어서, 정보어의 최상위비트에 부가비트 '1'을 부가한 제1부호어와 부가비트 '0'을 부가한 제2부호어를 발생하는 제1단계; 상기 제1 및 제2부호어의 기수코드에 대한 NRZI CDS를 각각 검출하는 제2단계; 현재의 INRZI DSV값의 극성이 정(+)인지 또는 부(-)인지의 여부를 판단하는 제3단계; 상기 제3단계에서 INRZI DSV값의 극성이 정(+)이면 상기 NRZI DSV의 극성이 부(-)인 부호어를 선택하고, 그렇지 않으면 상기 NRZI CDS의 극성이 정(+)인 부호어를 선택하는 제4단계; 및 상기 제4단계에서 선택된 부호어를 INRZI변조하는 제5단계를 포함함을 특징으로 하는 디지탈변조방법.A digital modulation method for INRZI modulation of a codeword having a predetermined additional bit added to an information word, comprising: a first codeword added with an additional bit '1' and an additional bit '0' added to the most significant bit of the information word; A first step of generating a two sign word; Detecting NRZI CDSs for the odd codes of the first and second codewords, respectively; Determining whether the polarity of the current INRZI DSV value is positive (+) or negative (-); In the third step, if the polarity of the INRZI DSV value is positive (+), the codeword having the negative polarity of the NRZI DSV is selected. Otherwise, the codeword having the positive polarity of the NRZI CDS is selected. Fourth step to do; And a fifth step of performing INRZI modulation on the codeword selected in the fourth step. 정보어의 최상위비트에 소정의 비트를 부가하여 부호어를 만들고 INRZI변조하기 위한 디지탈변조장치에 있어서, 정보어의 우수코드에 따라 NRZI CDS를 검출하고, 상기 검출된 CDS에 따라 부호어의 INRZI DSV값을 제어하기 위한 DSV검출수단; 상기 DSV검출수단에서 검출된 INRZI DSV값에 따라, 부호어를 선택하기 위한 제어신호를 발생하는 선택제어수단; 상기 제어신호에 따라 상기 제1 또는 제2부호어를 선택하기 위한 부호어 선택수단; 및 상기 선택된 부호어를 INRZI변조하기 위한 INRZI변조수단을 포함하여 INRZI변조시 변조출력의 직류를 제거하는 검출수단으로 정보신호의 우수비트만을 사용함을 특징으로 하는 디지탈변조장치.A digital modulator for adding a predetermined bit to the most significant bit of an information word to form a codeword and modulating INRZI, the digital modulator comprising: detecting an NRZI CDS according to the even code of the information word, and detecting the INRZI DSV of the codeword according to the detected CDS. DSV detecting means for controlling a value; Selection control means for generating a control signal for selecting a code word according to the INRZI DSV value detected by the DSV detection means; Codeword selecting means for selecting the first or second codeword in accordance with the control signal; And an INRZI modulation means for INRZI modulation of the selected codeword, wherein only the even bits of the information signal are used as detection means for removing direct current of the modulation output during INRZI modulation. 제2항에 있어서, 상기 선택제어수단은 상기 INRZI DSV값의 극성과 한 주기 전 부호어의 마지막에서 두번째 비트(EXITi-2)의 값을 배타 논리합하여 제어신호를 발생함을 특징으로 하는 디지탈변조장치.The digital signal generator as claimed in claim 2, wherein the selection control means generates a control signal by exclusively ORing the polarity of the INRZI DSV value and the value of the second bit EXIT i-2 at the end of the codeword one cycle ago. Modulator. 제2항에 있어서, 상기 부호어는 정보어에 1비트를 추가하여 만들어지는 것임을 특징으로 하는 디지탈변조장치.The digital modulator according to claim 2, wherein the codeword is made by adding one bit to the information word. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940012525A 1994-06-03 1994-06-03 Digital modulation method and apparatus thereof KR970010524B1 (en)

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Application Number Priority Date Filing Date Title
KR1019940012525A KR970010524B1 (en) 1994-06-03 1994-06-03 Digital modulation method and apparatus thereof

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Application Number Priority Date Filing Date Title
KR1019940012525A KR970010524B1 (en) 1994-06-03 1994-06-03 Digital modulation method and apparatus thereof

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KR960002285A true KR960002285A (en) 1996-01-26
KR970010524B1 KR970010524B1 (en) 1997-06-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100407496B1 (en) * 2001-04-02 2003-12-01 엘지전자 주식회사 Method and apparatus of converting a series of data words into a modulated signal
KR100444982B1 (en) * 2001-06-05 2004-08-21 삼성전자주식회사 Coding method with DC suppressed codestream and decoding method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100407496B1 (en) * 2001-04-02 2003-12-01 엘지전자 주식회사 Method and apparatus of converting a series of data words into a modulated signal
KR100444982B1 (en) * 2001-06-05 2004-08-21 삼성전자주식회사 Coding method with DC suppressed codestream and decoding method thereof

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