KR20030035376A - Apparatus and method for recording and reproducing a multi-formatted audio data - Google Patents

Abstract

PURPOSE: A device and a method for recording and reproducing audio data in multiformat are provided to normally reproduce digital audio data recorded in various multiformat in analog audio signal, thereby realizing more natural audio of high quality. CONSTITUTION: An AD(Analog-to-Digital) converter(15) converts an analog audio signal into a digital audio signal. An audio symbol counter(14) counts and outputs the converted digital audio data in a predetermined number of symbol sizes. An EFM(Eight to Fourteen Modulation)(13) and a recording signal processor(12) are provided for modulating and processing the counted and output digital audio data into a signal appropriate for recording. A sub-code generator(16) additionally records identification information at a sub-code R channel to identify a recording format of the modulated and processed digital audio data. A microcomputer(22) selectively and variably controls a sampling bit and frequency in the A/D converter and variably controls rotation velocity of a spindle motor(18) at a preliminarily set random speed corresponding to the selected sampling bit and frequency.

Description

Apparatus and method for recording and reproducing a multi-formatted audio data}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-format audio data recording / reproducing apparatus and method, and more particularly, to further segment audio data recorded on an optical disc such as a CD-RW (CD Rewritable) or the like. The present invention relates to a multi-format audio data recording / reproducing apparatus and method for variably recording high-quality audio data of various multi-formats and performing an audio reproducing operation corresponding to the recording format when a reproduction request is made.

Recently, an audio CD recorder (ACDR) has been developed that can convert analog audio signals to digital audio data and process the signals, and then record and store them on optical discs such as rewritable CDs (CD-RW). It is expected to be widely distributed and released.

On the other hand, in the audio CD recorder (ACDR), a sampling frequency and sampling bit for A / D conversion of an analog audio signal to digital audio data are set to a predetermined sampling frequency and a specific sampling bit. For example, after converting analog audio signal to digital audio data by using 44.1 KHz and 16 Bits specified in the general CD specification (CD Spec), digital audio data suitable for recording Digital audio data recording operation for recording and storing the rewritable CD and the like.

Accordingly, the user having the audio CD recorder (ACDR) can record and store the analog audio signal of the audio song he / she wants as digital audio data in the rewritable CD or the like, and also read out the digital audio data. By D / A conversion, it is possible to play and listen to high quality audio songs.

However, in a typical audio CD recorder, the sampling frequency and sampling bits for A / D conversion of an analog audio signal to digital audio data are fixed at 44.1 KHz and 16 Bits as specified in the general CD standard. There is a problem in that it is impossible to record / reproduce high quality digital audio data, so that recording and reproduction operations of natural high quality audio desired by a user cannot be performed.

Accordingly, the present invention was created to solve the above problems, and A / D conversion of an analog audio signal to various sampling frequencies and sampling bits, and variable control of the rotational speed of the corresponding spindle motor, multi-format Digital audio data is recorded on a rewritable CD-RW, etc., and the identification information of the multi-format is additionally recorded on a sub-code R channel, and recorded in a multi-format upon a reproduction request. SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-format audio data recording / reproducing apparatus and method that enables digital audio data to be read and reproduced with more natural high quality audio.

1 illustrates a configuration of an audio CD recorder (ACDR) to which a multi-format audio data recording / reproducing apparatus and method according to the present invention is applied.

FIG. 2 illustrates control information on audio data of a multi-format according to the present invention in a table form.

3 to 5 show a configuration for 24 symbols counted by the audio symbol counter according to the present invention,

6 illustrates identification information included in a sub code R channel according to the present invention.

※ Explanation of code for main part of drawing

10: optical disc 11: optical pickup

12: recording signal processing section 13: EFM modulation section

14: audio symbol counter 15: A / D conversion unit

16: sub code generator 17: clock generator

18: spindle motor 19: sled motor

20: motor drive unit 21: servo unit

22: control unit 23: memory unit

24: playback signal processing section 25: buffer section

26: digital signal processing unit 27: D / A conversion unit

According to an aspect of the present invention, there is provided a multi-format audio data recording method comprising: selecting and changing sampling bits and frequencies for A / D conversion of an analog audio signal; According to the selected sampling bit and frequency, variably controlling the rotational speed of the spindle motor to a predetermined predetermined double speed, and then recording the A / D converted digital audio data; And additionally recording identification information for identifying a recording format of the digital audio data in a sub code R channel.

An audio data recording apparatus of a multi-format according to the present invention comprises: A / D conversion means for A / D converting an analog audio signal; Audio symbol counting means for counting and outputting the A / D converted digital audio data with a predetermined number of symbol sizes; Modulation and signal processing means for modulating and recording signal processing the digital audio data counted and outputted with the predetermined number of symbol sizes into a signal suitable for recording; Subcode generating means for additionally recording identification information for identifying a recording format of the modulated and recorded signal processed digital audio data in a subcode R channel; And control means for variably controlling the sampling bit and frequency in the A / D conversion means and variably controlling the rotational speed of the spindle motor corresponding to the predetermined speed according to the selected sampling bit and frequency. Characterized in that configured to include, including,

In addition, the multi-format audio data reproduction method according to the present invention comprises the steps of: detecting a sub code R channel of the digital audio data read out from the optical recording medium; Confirming identification information of a recording format additionally recorded in the sub code R channel; According to the identification information of the recording format, characterized in that it comprises a three step of variably controlling the sampling bit and frequency, and the double speed of the spindle motor for D / A conversion of the digital audio data,

An apparatus for reproducing audio data of a multi-format according to the present invention comprises: buffer means for temporarily storing digital audio data read out from an optical recording medium; After confirming the identification information of the recording format from the subcode R channel of the temporarily stored digital audio data, the sampling bits and frequencies for D / A conversion of the digital audio data are respectively determined according to the identification information. Control means for variable control; And D / A conversion means for performing D / A conversion on the digital audio data at the sampling bits and the frequency.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a multi-format audio data recording / reproducing apparatus and method according to the present invention will now be described in detail with reference to the accompanying drawings.

First, FIG. 1 illustrates a configuration of an audio CD recorder to which a multi-format audio recording / reproducing apparatus and method according to the present invention is applied. In the audio CD recorder ACDR, a rewritable CD (CD-RW) is shown. An optical pickup 11 for reading or recording a signal recorded on the optical disc 10 such as; A spindle motor 18 for rotating the optical disk at high speed; A sled motor (19) for moving the optical pickup in the horizontal direction on the recording surface of the optical disc; A motor driver 20 for driving the spindle motor and the sled motor to rotate; A servo unit 21 for controlling the optical pickup and the motor driver to control tracking servo and focusing servo operation; An A / D converter 15 for A / D converting the analog audio signal to various sampling frequencies and sampling bits; An audio symbol counter (14) for counting and outputting the A / D converted digital audio data in a size of 24 symbols defined in the CD standard; An EFM modulator (13) for modulating the 24 symbol sized audio data by EFM (Eight to Fourteen Modulation); A recording signal processor (12) for signal-processing the EFM modulated data into data suitable for recording; A reproduction signal processor (24) for signal-processing the signal read out from the optical pickup into a signal suitable for reproduction; A buffer unit 25 for temporarily storing the reproduced signal processed data; A digital signal processor 26 for signal processing the temporarily stored data into digital audio data; A D / A converter 27 for converting the digital audio data into various sampling frequencies and sampling bits; A clock generator 17 selectively providing clocks of various sampling frequencies necessary for the A / D conversion or the D / A conversion; A sub code generator (16) for additionally recording identification information for identifying a sampling frequency and a sampling bit in the A / D converter in a sub code R channel; A control unit (22) for operating and controlling the components to enable recording / reproducing of various multi-format audio data; Memory unit 23 for storing the data necessary for the operation control may be included.

Meanwhile, as illustrated in FIG. 2, control information (Control Information) for recording and reproducing an analog audio signal as various multi-format audio data is recorded in the memory unit 23. The information includes information for variably controlling the sampling bit and sampling frequency in the A / D converter 15 and the rotational speed of the spindle motor corresponding thereto, and the identification information (SB_Info) for the sampling bit. .) And the identification information (SF_Info.) For the sampling frequency may be recorded including a recording size of 3 bits.

For example, in the control information, 16 bits, 24 bits, and 24 bits may be recorded as information on sampling bits in the A / D converter 15, and different sampling according to the sampling bits. Frequency, 44.1 KHz, 48 KHz, 88.2 KHz and 96 KHz can be recorded in association, respectively, and the sampling bit and sampling frequency can be arbitrarily selected and designated by a user who wants to record a variety of high quality audio.

Then, if any one sampling bit and sampling frequency are selected and specified by the user, the rotational speed of the spindle motor, that is, the spindle double speed, recorded in association therewith is variably set. The spindle double speed is shown in FIG. As the sampling bit and the frequency increase, it is relatively increased, so that audio data recorded on the rewritable CD 10 can always maintain the same recording density.

In addition, the identification information (SB_Info. SF_Info.) Of the sampling bits and frequencies selected by the user as described above is additionally recorded in the sub-code R channel, and various multi- Audio data recorded in the format can be read and reproduced normally, which will be described in detail below.

First, in the recording mode in which the analog audio signal is converted into digital audio data and recorded in the control unit 22, when the user selects and designates any one sampling bit and frequency recorded in the control information, for example, When 24 bits and 88.2 KHz are selected and specified, the spindle speed (Spindle Speed = X 3) and identification information (SB_Info = 001. SF_Info. = 010) recorded in association with the sampling bit and the frequency are read out and confirmed.

Subsequently, the sampling bits in the A / D converter 15 are variably set to 24 bits designated by the user, while the clock generator 17 is controlled to operate at a clock frequency of 48 KHz. The control is applied to the D conversion unit.

In addition, the control unit 22 controls the servo unit 21 to control the spindle motor to rotate at high speed at three times the speed.

Accordingly, the A / D converter 15 performs A / D conversion of the analog audio signal with a sampling bit of 24 bits and a sampling frequency of 88.2 KHz, and the spindle motor 18 rotates at high speed at triple speed. In this case, the control unit 22 controls the audio symbol counter 14 in accordance with the sampling bit of the A / D converter 15 and the double speed of the spindle motor 18. The / D converted digital audio data is counted and output by the audio symbol counter 14 in a size of 24 symbols defined in the general CD standard.

For example, as shown in FIG. 3, in the case of 16 bits of sampling bits and a spindle of 1x speed, the 24 symbols are 6 samples composed of 4 symbols having an 8-bit recording size. It is counted and the Sync bit is additionally recorded at the head.

On the other hand, as shown in Fig. 4, in the case of a sampling bit of 24 bits and a spindle of 1.5 times the speed, the 24 symbols are counted as four samples composed of six symbols having a recording size of 8 bits, and the head of the 24 symbols is counted. The Sync bit is additionally recorded.

In addition, as shown in Fig. 5, in the case of a 32-bit sampling bit and a double-speed spindle, the 24 symbols are counted as three samples composed of eight symbols having a recording size of eight bits, and the head thereof. Since the sync bit is additionally recorded in the audio symbol counter 14, the audio symbol counter 14 has 24 symbols of audio having the same recording size at all times regardless of the double speed of the spindle motor and the sampling bit in the A / D converter. Count and output data.

Then, the control unit 22 controls the sub code generator 16 to operate by controlling the three-bit identification information '001' for the sampling bit and the three-bit identification information '010' for the sampling frequency. As shown in Fig. 6, control is performed to include and record in the sub code R channel.

Accordingly, in the EFM modulator 13 for modulating the 24 symbols of audio data into EFM modulated data, the identification information is recorded and included in the sub code R channel, so that the rewritable CD 10 can be recorded upon reproduction request. The identification information of the recording format for the audio data recorded and stored in the recording data can be read and used.

On the other hand, when the control unit 22 reads and reproduces the audio data recorded on the rewritable CD 10 in response to a user's request, the control unit 22 passes through the optical pickup 11 and the reproduction signal processing unit 24, and the buffer unit ( The sub code R channel of the audio data temporarily stored in 24) is read out to confirm the recording format of the audio data currently being read out and reproduced.

For example, the identification information (SB_Info., SF_Info.) Read out and confirmed from the sub code R channel includes '001' indicating sampling bits of 24 bits in the A / D converter 15 and a sampling frequency of 88.2 KHz. In the case of '010', the controller 22 checks this and variably controls the sampling bits in the D / A converter 27 for D / A converting the digital audio data into an analog audio signal to 24 bits. do.

Then, the clock generator 17 is controlled to control the clock of the 88.2 KHz sampling frequency to be applied to the D / A converter 27. In addition, the control unit 22 controls the servo unit 21 to control the spindle motor to rotate at high speed at three times the speed.

Accordingly, the D / A converter 27 converts the digital audio data output through the digital signal processor 26 into a sampling bit of 24 bits and a sampling frequency of 88.2 KHz. Since the motor 18 rotates at high speed at three times, the reproduction operation corresponding to the original recording format is performed, so that high-quality audio data recorded in various multi-formats can be read out and reproduced as a normal analog audio signal.

Or more, preferred embodiments of the present invention described above, which is disclosed for the purpose of illustration, within the spirit and scope of the present invention disclosed in the appended claims, various other embodiments of the improvement, modification, replacement Or addition may be possible.

The multi-format audio data recording / reproducing apparatus and method according to the present invention constituted and configured as described above comprises a rewritable CD (CD-RW) or the like after A / D conversion and signal processing of an analog audio signal into digital audio data. In the audio CD recorder (ACDR) for recording and storing on the same optical disc, A / D conversion of the analog audio signal to various sampling bits and sampling frequencies, variable control of the rotational speed of the corresponding spindle motor, High-quality digital audio data is recorded in a multi-format, and the identification information of the multi-format is additionally recorded in the sub-code R channel, and upon playback request, digital audio data recorded in various multi-formats is recorded. By allowing normal playback with analog audio signals, users can enjoy higher sound quality Record video and very useful inventions that are able to play.

Claims (13)

Selecting and varying sampling bits and frequencies for A / D conversion of the analog audio signal; According to the selected sampling bit and frequency, variably controlling the rotational speed of the spindle motor to a predetermined predetermined double speed, and then recording the A / D converted digital audio data; And And additionally recording identification information for identifying the recording format of the digital audio data in a sub code R channel. The method of claim 1, In the first step, the sampling bit and the frequency are selected and varied according to a user external key input. The method of claim 1, And the sampling bit, the frequency, and the double speed of the spindle motor are pre-set in association so that audio data of the same recording density is recorded. The method of claim 1, The identification information is identification information for identifying the sampling bits and the frequencies, respectively, and is additionally recorded in a sub code R channel. A / D conversion means for A / D conversion of the analog audio signal; Audio symbol counting means for counting and outputting the A / D converted digital audio data with a predetermined number of symbol sizes; Modulation and signal processing means for modulating and recording signal processing the digital audio data counted and outputted with the predetermined number of symbol sizes into a signal suitable for recording; Subcode generating means for additionally recording identification information for identifying a recording format of the modulated and recorded signal processed digital audio data in a subcode R channel; And And control means for variably controlling the sampling bit and frequency in the A / D conversion means and variably controlling the rotational speed of the spindle motor corresponding to the predetermined speed according to the selected sampling bit and frequency. Multi-format audio data recording apparatus, characterized in that configured to include. The method of claim 5, And the control means selects and varies the sampling bit and frequency according to a user external key input. The method of claim 5, The control means controls the subcode generating means so that identification information for identifying the sampling bits and frequencies is additionally recorded in the subcode R channel. . The method of claim 5, The audio symbol counting means comprises: 24 symbols consisting of a predetermined number of samples according to the double speed of the sampling bit and the spindle motor, and additionally recording sync bits at the head thereof. . Detecting a sub code R channel of the digital audio data read out from the optical record carrier; Confirming identification information of a recording format additionally recorded in the sub code R channel; And three steps of variably controlling sampling bits and frequencies for D / A conversion of the digital audio data and double speed of the spindle motor according to the identification information of the recording format. How to play. The method of claim 9, And the sampling bits and the frequencies are detected as three bits of identification information additionally recorded in the sub code R channel. The method of claim 10, The double speed of the spindle motor is preset in accordance with the sampling bit and the frequency. Buffer means for temporarily storing digital audio data read out from the optical record carrier; After confirming the identification information of the recording format from the subcode R channel of the temporarily stored digital audio data, the sampling bits and frequencies for D / A conversion of the digital audio data are respectively determined according to the identification information. Control means for variable control; And And D / A conversion means for D / A conversion and outputting the digital audio data to the sampling bits and the frequency. The method of claim 12, And the control means determines the double speed of the spindle motor in accordance with the sampling bit and the frequency in the D / A converting means.