WO2000058952A1 - Procede et appareil d'enregistrement de donnees audio numeriques sur une bande en cassette - Google Patents

Procede et appareil d'enregistrement de donnees audio numeriques sur une bande en cassette Download PDF

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Publication number
WO2000058952A1
WO2000058952A1 PCT/KR2000/000010 KR0000010W WO0058952A1 WO 2000058952 A1 WO2000058952 A1 WO 2000058952A1 KR 0000010 W KR0000010 W KR 0000010W WO 0058952 A1 WO0058952 A1 WO 0058952A1
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WO
WIPO (PCT)
Prior art keywords
audio data
recording
data
decoding
digital
Prior art date
Application number
PCT/KR2000/000010
Other languages
English (en)
Inventor
Soo Geun You
Original Assignee
Soo Geun You
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Soo Geun You filed Critical Soo Geun You
Priority to AU30795/00A priority Critical patent/AU3079500A/en
Publication of WO2000058952A1 publication Critical patent/WO2000058952A1/fr

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Classifications

    • 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
    • G11B20/02—Analogue recording or reproducing
    • G11B20/04—Direct recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • 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
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1201—Formatting, e.g. arrangement of data block or words on the record carriers on tapes
    • G11B20/1202—Formatting, e.g. arrangement of data block or words on the record carriers on tapes with longitudinal tracks only
    • 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
    • G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
    • G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
    • 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
    • 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
    • G11B20/00992—Circuits for stereophonic or quadraphonic recording or reproducing
    • 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
    • G11B2020/10537—Audio or video recording
    • G11B2020/10546—Audio or video recording specifically adapted for audio data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
    • G11B27/028—Electronic editing of analogue information signals, e.g. audio or video signals with computer assistance

Definitions

  • the present invention relates to a method of and apparatus for decoding digital audio signals and recording them on a magnetic tape in such a way that two audio signals are recorded on both tracks of the magnetic tape simultaneously.
  • Favorite songs can be readily collected by just navigating over music WWW sites on the Internet and downloading them from the WWW sites.
  • the downloaded songs are stored in a personal computer for future playback using software players installed on the personal computer. Or they are recorded on a magnetic cassette tape by using a cassette tape recorder thrcugn the analog output attached in trie personal computer.
  • Wnen tne downloaded songs are asked to be recorded on a magnetic tape, they are recorded on a track on the magnetic tape one after another.
  • a magnetic tape comprises of two tracks: forward track (track A) and backward track (track B) , as shown in FIG. 1. While the magnetic tape travels in the forward direction, the downloaded songs start to be decoded and recorded on the forward track. Once recording songs on the forward track (track A) is completed, the magnetic tape begins to travel in the reverse direction and thus the remaining songs are recorded on the other track or track B.
  • the present invention provides an apparatus for quickly recording digital audio data, comprising means for receiving digital encoded audio data from external sources; memory for storing the received audio data; means for decoding the encoded audio data; a D/A (digital-to-analog) converter for converting the decoded audio data into analog audio signals; and means for recording the analog audio signals on an analog recording medium inserted in the apparatus .
  • digital encoded audio data which are transmitted from an external source are received by the receiving means and are then stored in the memory temporarily.
  • the decoding means decodes the digital encoded audio data in the memory in a manner that two music data contained in the decoded audio data are decoded forward and backward, respectively, based on information representing which track is used to record each of the two music data. That is, one music data is decoded in the order of its encoding order, but the other is decoded in the reverse order.
  • the decoded audio data, or the two music data are converted into analog signals by the D/A converter and are then recorded on the forward track and the backward track on a magnetic tape simultaneously.
  • FIG. 1 is a schematic diagram showing the recording travel direction on a cassette tape by conventional cassette tape recorders
  • FIG. 2 is a block diagram showing a preferred embodiment of the recording apparatus according to the present invention.
  • FIG. 3 is a flowchart showing a preferred embodiment of the method according to the present invention.
  • FIG. 4A illustrates a list of selected songs
  • FIG. 4B illustrates a recorded pattern of the selected songs on a magnetic tape
  • FIG. 5 is a schematic diagram showing the recording travel direction on a cassette tape by the recording apparatus according to the present invention
  • FIG. 6 is a schematic diagram showing playback travel direction on a cassette tape.
  • FIG. 2 shows a block diagram of a preferred embodiment of the apparatus for quickly recording digital audio data on a cassette tape according to the present invention, comprising an interface 10 for exchanging data with a personal computer 200 through its parallel port; a timer 20 for counting the elapsed time; a memory 40 for storing audio data that are received from the personal computer 200 through the interface 10; a DMA (direct memory access) 41 for quickly reading out data from the memory 40; a pair of audio decoders 50a and 50b for performing forward and backward decoding of the data read out from the DMA 41 and producing PCM (pulse code modulation) data; a pair of D/A converters 60a and 60b for converting the PCM data into analog signals; a pair of buffers 70a and 70b for impedance matching; a deck 80 where two analog signals are recorded on both tracks on a magnetic tape simultaneously; a deck controller 81; and central processing unit (CPU) 30 for executing control programs stored in a ROM 31 to control components above.
  • CPU central
  • a user chooses his/her favorite songs by navigating over WWW music sites on the Internet or service providers on a communication network and then downloads them into his/her personal computer 200.
  • the songs are generally in the MP3 (MPEG-I Layer 3) encoded form.
  • MP3 MPEG-I Layer 3
  • each song can be selected with assignment of track on which it will be recorded (track A or B) .
  • track A or B assignment of track on which it will be recorded
  • the songs will be recorded on a cassette tape from the track A to B in the order in which they were selected.
  • about fourteen songs are chosen with consideration of capacity cf a general cassette tape.
  • the personal computer 200 For the songs to be recorded on the tape loaded in the recording apparatus 300, the personal computer 200 must be connected to the apparatus 300. For the detailed description, let us suppose that fourteen songs are selected with their designated tracks, as shown in FIG. 4A. Once recording of the songs is requested (S10), the data of the songs are transmitted to the interface 10 of the recording apparatus 300 through the line between them. An amount of data that are sent to the recording apparatus 300 at a time depends on the size of the memory 40 in which the data are stored temporarily before recording. If the memory size is large enough to store more than fourteen songs, data of all the songs may be transmitted to the recording apparatus 300 at a time. The memory 40 must be large enough that, at least, more than two songs are sent to the recording apparatus 300 at a time .
  • the personal computer 200 selects two songs among the fourteen songs and sends them to the recording apparatus 300.
  • the two songs that will be recorded on the beginning of the track A and the end of the track B, respectively are chosen initially, e.g., the songs of no. 1 and no. 14 in FIG. 4A.
  • Information about its running time and which track it is recorded on, so- called track information, is added to the beginning of each song before it is sent to the recording apparatus 300.
  • the data are stored in the memory 40 temporarily by a control program running on the CPU 30 (S21) .
  • the control program has been stored in ROM 31.
  • the control program reads the track information and then determines which decoder must receive the song data from the DMA 41 on the basis of the track information.
  • control program controls the DMA 41 to
  • the data stored in memory 40 i.e., the two songs that will be recorded on the track A and B, respectively, are read out alternatively by the DMA 41 in such a way that the data for the track A and B are fed to the forward audio
  • the DMA 41 reads out the data from the beginning sequentially and sends them to the forward audio decoder
  • the DMA 41 reads out the data from the end backward and sends them to the backward audio decoder 50b.
  • each audio decoder starts to decode them (S31) . While the forward audio decoder 50a decodes data forward, the backward audio decoder 50b decodes data bac ward, i.e., data are decoded in the reverse order to its encoding order.
  • the first step in the backward decoding process of an MP3 bit stream is to locate the last frame header in an MP3 audio bit stream to perform backward decoding process. Then, the audio stream is divi ⁇ ed into side information containing how the frame was encoded, scale factor specifying gain of each frequency band, and Huffman-coded data .
  • the decoder By decoding the side information, the decoder gets to know how to decode the data in the frame.
  • MP3 uses bit reservoir technique whereby bit rate may be borrowed from previous frames in order to provide more bits to demanding parts of the input signal.
  • the current frame being decoded may include audio data belonging to the frames that will be presented subsequently.
  • a pointer which points to the location of starting position of the audio data for that frame is extracted from that frame's side information and thereby the data from the starting position to the current frame are decoded at a time.
  • the starting byte of the audio data for the current frame is limited to 511 bytes away from the current frame .
  • Huffman-decoding is performed based on the side information and Huffman trees which were constructed and used in the encoding process.
  • a frame is, in general, encoded in two granule levels (granule 0 and granule 1) and the data of granule level 0 must be decoded before the data of granule level 1 is decoded. It is possible to decode the MP3 encoded data from granule level 0 to granule level 1 sequentially in the forward decoding. However, data of granule level 0 and 1 must be decoded at a time in the backward decoding process .
  • the resulting data have to be dequantized and re-scaled using the scale factors into real spectral energy values. For example, if the Huffman-decoded value is Y, then the real spectral energy value is obtained by multiplying ⁇ ⁇ 4/3) and scale factors .
  • IMDCT inverse modified cosine discrete transform
  • the final step to get the output audio samples is to synthesize 32 subband samples.
  • the subband synthesis operation is to interpolate 32 subband samples into real audio samples in reversed in time.
  • Two sets of PCM data, or forward-decoded data and backward-decoded data are sent to the D/A converters 60a and 60b whereby they are converted to analog signals (S32) .
  • the two analog signals are supplied to the deck 80 through buffers 70a and 70b which are used for impedance matching .
  • the two analog audio signals are recorded on a cassette tape loaded in the deck 80 simultaneously under control of deck controller 81 which is controlled by the program running on the CPU 30 (S33) .
  • the audio signal which is decoded by the forward audio decoder 50a is recorded on the track A on the cassette tape and at the same time, the signal decoded by the backward audio decoder 50b is recorded on the track B on the cassette tape.
  • the control program counts an elapsed time since recording by timer 20. Based on the elapsed time and the running times of the audio signals, the recording completion time of each of the audio signals is calculated with reference to a recording speed at which the tape travels.
  • the control program continues to check whether or not the elapsed time corresponds to recording song switch time, i.e., the recording completion time of the audio signal of short running time minus a predetermined period of time required to receive a new song through a communication path, on average (S40) .
  • the control program running on the CPU 30 sends a request signal to the personal computer 200 through the interface 10 to inform that transmission of another song s needed (S41) .
  • the control program running on the CPU 30 sends a request signal to the personal computer 200 through the interface 10 to inform that transmission of another song s needed (S41) .
  • track information is sent the to personal computer 200. That is, when recording a song on the track A has been completed, a song belonging to the song list containing songs that is supposed to be recorded on the track A is requested .
  • the personal computer 200 Upon receiving the request signal, the personal computer 200 selects and sends a song to the recording apparatus 300.
  • the song to be sent is chosen with reference to a table showing a recording order list, as shown in FIG. 4A.
  • the song of no. 2 is selected and then sent to the recording apparatus 300 through interface 10.
  • the personal computer 200 sends the song of no.
  • the control program running on the CPU 30 receives the new song through the interface 10 and then stores it in the memory 40 temporarily.
  • the read-out start address at which the stored song data will be read out from the memory is kept temporarily.
  • the read-out start address can be either the beginning of the stored data or the end thereof, depending on which track the stored data will be recorded on.
  • the stored data start to be read out from the memory 40 through DMA 41 at its beginning address (its end address) and are then fed to the forward audio decoder (backward audio decoder) for recording.
  • FIG. 4B shows a schematic diagram showing a recorded pattern of all the songs on a cassette tape .
  • the personal computer 200 sends the data of all the fourteen songs to the recording apparatus 300 one after another. At this time, for each song, information concerning its running time (or its size) and which track it will be recorded on is also sent to the recording apparatus 300. Then, the fourteen songs are stored in the memory 40 in the recording apparatus one after another (S22) . On the storing is completed (S50), based on the track information, the control program running on the CPU 30 reads out data of two songs that will be recorded on the beginning of the track A and the end of the track B, respectively, out of the fourteen songs in the memory 40.
  • all the songs can be recorded on the cassette tape in the order in which they are received from the personal computer 200.
  • the number of songs requested to record is fourteen, they are recorded in such a way that songs of no. 2 and no. 13 are recorded on the tracks A and B, respectively, after recording songs of no. 2 and no. 13 is finished.
  • FIG. 6 shows the travel direction of a magnetic head which reads out signals from the cassette tape for playback in conventional cassette tape players.
  • adding a component for playback of the cassette tape to the recording apparatus 300 makes it possible that a user listens to songs as well as recording songs on the cassette tape with a single apparatus .

Abstract

L'invention concerne un procédé et un appareil servant à décoder des signaux audio numériques et à les enregistrer sur une bande magnétique de façon à enregistrer simultanément deux signaux audio sur les deux pistes de la bande magnétique. Le procédé comporte les étapes consistant à recevoir deux ou davantage de données audio numériques d'une source externe; obtenir des informations de piste indiquant quelle piste est utilisée pour enregistrer chacune des données audio; décoder chaque donnée audio dans l'ordre de codage ou dans l'ordre inverse en fonction des informations de piste; convertir chaque donnée audio décodée en signal analogique ; enregistrer simultanément deux signaux analogiques sur les deux pistes de la bande magnétique; et demander de nouvelles données audio numériques de la source externe à un moment prédéterminé, avant la fin de l'enregistrement simultané de l'un des deux signaux analogiques. L'invention permet d'enregistrer rapidement des données audio numériques codées sur une bande magnétique en cassette, laquelle peut être lue par des lecteurs de cassettes audio classiques largement répandus.
PCT/KR2000/000010 1999-03-26 2000-01-10 Procede et appareil d'enregistrement de donnees audio numeriques sur une bande en cassette WO2000058952A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU30795/00A AU3079500A (en) 1999-03-26 2000-01-10 Method and apparatus for recording digital audio data on a cassette tape

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1999/10465 1999-03-26
KR1019990010465A KR100317064B1 (ko) 1999-03-26 1999-03-26 디지털 음악 고속 녹음장치 및 녹음방법

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WO2000058952A1 true WO2000058952A1 (fr) 2000-10-05

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KR (1) KR100317064B1 (fr)
AU (1) AU3079500A (fr)
WO (1) WO2000058952A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0213961A2 (fr) * 1985-09-03 1987-03-11 Sony Corporation Méthodes et appareil d'enregistrement et/ou de reproduction de données digitales
EP0322037A1 (fr) * 1987-12-21 1989-06-28 Koninklijke Philips Electronics N.V. Circuit de lecture d'information enregistrée sur un support d'enregistrement
EP0390576A1 (fr) * 1989-03-31 1990-10-03 Kabushiki Kaisha Toshiba Appareil d'enregistrement/reproduction

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KR940007288B1 (ko) * 1991-06-19 1994-08-12 삼성전자 주식회사 Vcr시스템의 테이프 양면 기록/재생 방법 및 회로
KR950005541B1 (ko) * 1993-03-19 1995-05-25 금성알프스전자주식회사 더블데크 카세트 레코더의 양면 동시 녹음장치
JPH08124306A (ja) * 1994-10-28 1996-05-17 Hitachi Ltd ディジタル信号記録方法及び装置
KR100339535B1 (ko) * 1998-06-23 2002-09-27 엘지전자주식회사 카셋트플레이어용디지털오디오데이터플레이어및그재생방법
KR19990014643A (ko) * 1998-11-28 1999-02-25 김종석 디지털 오디오 파일 재생 시스템
KR19990024139A (ko) * 1998-12-11 1999-03-25 박선면 압축된 음악 데이터 기록 및 재생 장치
KR19990046418A (ko) * 1999-03-10 1999-07-05 백승혁 카세트에사용가능한엠피-3재생장치및그제어방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0213961A2 (fr) * 1985-09-03 1987-03-11 Sony Corporation Méthodes et appareil d'enregistrement et/ou de reproduction de données digitales
EP0322037A1 (fr) * 1987-12-21 1989-06-28 Koninklijke Philips Electronics N.V. Circuit de lecture d'information enregistrée sur un support d'enregistrement
EP0390576A1 (fr) * 1989-03-31 1990-10-03 Kabushiki Kaisha Toshiba Appareil d'enregistrement/reproduction

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AU3079500A (en) 2000-10-16
KR20000061431A (ko) 2000-10-16
KR100317064B1 (ko) 2001-12-22

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