JP3159602B2 - Digital recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording method, and more particularly to a digital recording method based on an analog audio signal obtained by D / A conversion of a digital audio signal because copying of the digital audio signal output from a digital audio source device is prohibited. The present invention relates to a digital recording method suitable for digital recording.

[0002]

2. Description of the Related Art There is a DAT that can input a digital audio signal from a digital audio source device and digitally record the digital audio signal as it is on a tape. However, some sources do not allow copying, in which case,
A digital audio source device internally converts a digital audio signal into a digital signal, and outputs the analog audio signal to the DAT. The A / D converter of the DAT converts the digital audio signal into a digital audio signal, and digitally records it on a tape. Will do.

[0003]

THE INVENTION Problems to be Solved] In this case, when forming a digital audio signal Anal log audio signal A / D converted by DAT, songs between parts which should originally be silent at the time of A / D conversion Quantum The silencing signal does not result in a silent signal, and noise data is recorded on the tape, which is disturbing during reproduction. Therefore, in order to silence between songs, after recording is completed, it is necessary to search for and erase between songs while reproducing, which has been a problem that the operation is troublesome and takes time. SUMMARY OF THE INVENTION In view of the above-mentioned problems of the related art, an object of the present invention is to reduce the work load when digitally recording an analog audio signal output of a digital audio source device to prohibit copying.

[0004]

[0005]

SUMMARY OF THE INVENTION In one aspect of the present invention , a digital audio source device has an X indicating an index.
A digital audio interface signal including
An analog audio signal obtained by D / A conversion of the digital audio signal is simultaneously output to a digital recording device,
The digital recording device records the digital audio signal obtained by A / D conversion of the analog audio signal input on a recording medium. At this time, while X in the digital audio interface signal is zero, the analog audio signal input Is recorded on a recording medium, instead of a digital audio signal obtained by A / D conversion of a digital audio signal.

[0006]

In another aspect of the present invention, a digital audio source device simultaneously outputs a digital audio interface signal including X indicating an index and an analog audio signal obtained by D / A converting the digital audio signal to a digital recording device. When the digital recording device determines that copying is prohibited from the copy prohibition / permission information in the digital audio interface signal, the digital recording device records a digital audio signal obtained by A / D converting an analog audio signal input on a recording medium. While X in a digital audio interface signal is zero, a digital audio signal indicating silence is recorded on a recording medium instead of a digital audio signal obtained by A / D conversion of an analog audio signal input. It is characterized in that was.

[0008]

[0009]

According to one aspect of the present invention , a digital audio source device simultaneously outputs a digital audio interface signal including X indicating an index and an analog audio signal obtained by D / A converting the digital audio signal to a digital recording device, A digital recording device records a digital audio signal obtained by A / D conversion of an analog audio signal input on a recording medium.
While the signal is zero, the analog audio signal input
Instead of the digital audio signal obtained by the / D conversion, a digital audio signal indicating silence is recorded on the recording medium, so that a silent state is automatically generated between the music pieces. Save time and trouble searching for and erasing.

[0010]

According to another aspect of the present invention , a digital audio interface signal output from a digital audio source device includes copy prohibition / permission information together with X indicating an index. When the copy prohibition is determined from the copy prohibition / permission information in the interface signal, the digital audio signal obtained by A / D conversion of the analog audio signal input is recorded on a recording medium.
While the signal is zero, the analog audio signal input
Since the digital audio signal indicating silence is recorded on the recording medium instead of the digital audio signal obtained by the / D conversion, even if the user does not check whether the copying of the digital audio source is prohibited,
If copying is prohibited, digital recording is automatically performed based on the analog audio signal input, so that the user's effort is saved and the gap between the songs is automatically silenced. It saves time and effort to erase.

[0012]

FIG. 1 is a circuit diagram of a digital recording system embodying a digital recording method according to the present invention. Numeral 1 denotes a CD player as an example of a digital audio source device. During reproduction, a track number, an X indicating an index, and a program time (MI
N, SEC, FRAME), a control code including a copy prohibition / permission code, and a 16-bit digital audio signal, and a digital audio interface signal including a predetermined control code and a digital audio signal from a D-OUT (digital out) terminal. Output, and at the same time, an analog audio signal obtained by D / A converting a digital audio signal read from a CD from an A-OUT (analog out) terminal. User data bits (U
-bit) contains the track number, X indicating the index, and program time, and the channel status bit
The copy prohibition / permission code is included in the category code of (C-bit).

Reference numeral 2 denotes D as an example of a digital recording device.
The AT is a D-IN (digital in) terminal and a D-OUT (digital out) terminal of the CD player 1 are connected by a coaxial cable of 3, and an A-IN terminal (analog in) terminal and a CD A-OUT of player 1 (analog out)
The terminals are connected by a 4 pin code. Reference numeral 5 denotes a DAI (digital audio interface) circuit which demodulates and outputs a digital audio signal and a control code when a digital audio interface signal is input to the D-IN terminal. Reference numeral 6 denotes an analog audio signal input to the A-IN terminal. This is an A / D converter that obtains a 16-bit digital audio signal by performing / D conversion.

Reference numeral 7 denotes a signal processing circuit which always receives a control code from the DAI circuit, and outputs a U-bit track number,
The X and C-bit category codes are extracted and output to a controller described later. When a digital input recording command is received from the controller, the digital audio signal input from the DAI circuit and a predetermined control code input from the controller are combined. When the analog input recording instruction is received from the controller, the digital audio signal is converted into a recording signal in which the digital audio signal input from the A / D converter and the predetermined control code input from the controller are combined. And output. During analog input recording, while receiving a silence command from the controller, 16 bits represent silence in two's complement notation “0000”.
Generate a digital audio signal with "000000000000000" or "1111111111111111" (Infinity 0),
A control code is matched instead of the digital audio signal input from the A / D converter, converted into a predetermined recording signal, and output.

Reference numeral 8 denotes a recording head mounted on a rotating drum (not shown), 9 denotes an RF amplifier for driving the recording head based on a recording signal input from a signal processing circuit, and 10 denotes a drum motor (not shown) based on a command from a controller. , A servo circuit for performing servo control of a capstan motor and a reel motor, and 11 are various operations such as an operation for designating three kinds of recording modes of an automatic selection recording mode, a digital input recording mode, and an analog input recording mode, a REC operation, and a STOP operation. And an operation / display panel 12 for displaying during recording operation, digital copy disabled, etc.
An AT tape 13 is a controller composed of a microcomputer. When a recording mode is designated and an REC operation is performed on an operation / display panel, each unit is controlled in accordance with the designated recording mode, and an externally input audio signal is input. The signal is digitally recorded on the DAT tape 12.

Next, a method of digital recording from a CD to the DAT tape 12 will be described focusing on the operation of the controller 13. Designation of the automatic selection recording mode The automatic selection recording mode is designated by the operation / display panel 11 of the DAT 2, the REC operation is performed, and the PLAY operation is performed by the CD player 1 to start the reproduction of the CD. The CD player 1 outputs a digital audio signal and a digital audio interface signal including a predetermined control code from a D-OUT terminal, and simultaneously outputs an analog audio signal from an A-OUT terminal. The U-bit of the control code of the digital audio interface signal includes a track number, an X indicating an index, and a program time, and the C-bit category code includes a copy prohibition / permission code. The DAT circuit 5 of the DAT 2 demodulates and extracts a digital audio signal and a control code from the digital audio interface signal and outputs the demodulated signal to the signal processing circuit 7. The signal processing circuit 7 extracts the track number, X, and copy prohibition / permission code from the control code input from the DAI circuit 5 and outputs them to the controller 13.

The controller 13 includes an operation / display panel 11
When the REC operation is performed, the respective parts are controlled to perform a recording operation. Also, since the automatic selection recording mode has been designated in advance, it is determined whether or not digital copy is prohibited by the copy prohibition / permission code input from the signal processing circuit 7, and when the digital copy is prohibited, the analog input recording mode is set. Then, an analog input recording command is given to the signal processing circuit 7. Then, the track number and X are input from the signal processing circuit 7, and every time the track number changes, a predetermined control code having a start ID set for a certain time from the time of the change is output to the signal processing circuit 7, and X is While it is zero indicating the interval between songs, a silent command is output to the signal processing circuit 7.

When the signal processing circuit 7 receives the analog input recording command, the digital audio signal input from the A / D converter 6 and the control code input from the controller 13 are matched when the silent command is not input from the controller 13. The signal is converted into a predetermined recording signal and output to the RF amplifier 9 to drive the recording head 8. When a silent command is input from the controller 13, an internal 16-bit signal is used instead of the A / D-converted digital audio signal.
Generates a digital audio signal of “0000000000000000” or “1111111111111111”,
Converts to a recording signal along with the control code input from
The signal is output to the RF amplifier 9 to drive the recording head 8.

As a result, even if analog input recording is performed,
As shown in FIG. 2, every time the track number in the digital audio interface signal changes from 0 to 1, 1 to 2, the start ID indicating the beginning of the music is automatically set to the DAT tape 12 for a certain period of time after the change. Therefore, after the recording is completed, the user can search for the beginning of the song while reproducing and save time and effort for pressing the start ID key of the operation / display panel 11. Also, while X in the digital audio interface signal is zero, a digital audio signal indicating complete silence is recorded, so that quantization noise by the A / D converter 6 is recorded between music pieces. This can prevent annoying inter-song noise during reproduction.

On the other hand, when the controller 13 checks the copy prohibition / permission code in accordance with the designation of the automatic selection recording mode, if copying is permitted, the digital input recording mode is set, and the digital input recording command is sent to the signal processing circuit 7. , And the signal processing circuit 7 receiving the command causes the DAI
The digital audio signal input from the circuit 5 is combined with a predetermined control code input from the controller 13 to be converted into a recording signal and output to the RF amplifier 8. At this time, the recording control code output from the controller 13 to the signal processing circuit 7 includes the track number, X, and program time extracted from the control code input from the DAI circuit 5 by the signal processing circuit 7.

[0021] Specify the digital input recording mode in operation / display panel 11 of the specified digital input recording mode DAT2 when the REC operation, the controller 13 checks the copy prohibition / permission code input from the signal processing circuit 7 If copying is permitted, the digital input recording mode is set and the control code including the track number, X, and program time input from the signal processing circuit 7 is recorded on the DAT tape 12 together with the digital audio signal input from the DAI circuit 5. . However, when copying is prohibited, recording stop control is performed on each unit to display on the operation / display panel 11 that digital copying is prohibited.

Specifying the analog input recording mode As a result of specifying the digital input recording mode, digital copying is prohibited. Therefore, when the analog input recording mode is specified again on the operation / display panel 11 of the DAT 2 and the REC operation is performed, the controller 13 is operated. In the automatic selection recording mode described above, as a result of checking the copy prohibition / permission code, the same processing as when copy is prohibited is performed, and the start ID is changed every time the track number input from the signal processing circuit 7 changes. A / A
The digital audio signal output from the D converter 6 is recorded in the DAT 12 together with the digital audio signal.
Record in 2.

According to this embodiment, when recording on the DAT tape 12 in the analog input recording mode, the DAI circuit 5
The signal processing circuit 7 extracts the track number and X from the control code extracted from the digital audio interface signal and outputs the track number and X to the controller 13. Is output to the signal processing circuit 7 to be converted into a recording signal together with the digital audio signal input from the A / D converter 6 and when X becomes zero. During this time, a silent command is given to the signal processing circuit 7 and the A / D converter 6
Instead of the digital audio signal input from
Since a digital audio signal with all bits set to 0 or 1 is generated and converted into a recording signal together with the control code output by the controller 13 and output, a DAT from the CD is performed based on an analog input from the CD player 1. When dubbing to the tape 12, the start ID is automatically recorded on the DAT tape 12 every time a song is changed on a CD. Therefore, even if the user does not perform a start ID input operation after the recording is completed, the DAT tape 12 At the time of playback of the song. In addition, since a digital audio signal indicating silence is recorded on the DAT tape 12 in a portion corresponding to a space between music pieces of a CD, there is no possibility of suffering from noise between music pieces during reproduction.

Also, if the user has a CD player 1 and a DAT 2
Is connected to the coaxial cable 3 by the pin code 4 and the CD player 1 performs the reproducing operation, and the DAT 2 only designates the automatic selection recording mode and performs the recording operation. Discriminates whether or not the data is recorded. If the recording is prohibited, the digital recording is performed with a start ID based on the analog input and silence between the music pieces. If the recording is permitted, a predetermined control code is generated based on the digital input. Since the digital recording is additionally performed, the user can check whether or not copying is prohibited. When the copying is prohibited, the user can save the trouble of instructing analog input recording and, when permitted, instructing digital input recording.

In the above-described embodiment, the D-OUT terminal of the CD player 1 and the D-IN terminal of the DAT 2 are connected by the coaxial cable 3, but if both have optical connectors, an optical fiber cable is used. May be used to transmit and receive digital audio interface signals. Further, when digital recording is performed in the analog input recording mode, the controller 13 outputs a control code having a start ID for a certain period of time from the time when the track number input from the signal processing circuit 7 changes. But
On the other hand, MIN, SEC (or MIN, SEC, FR) of the program time input from the signal processing circuit 7
Every time AME) becomes zero, a control code with a start ID may be output for a certain period of time from when it becomes zero (see the broken line in FIG. 2). Program time is MIN, SEC (or MIN, SEC, F
RAME) is all zero, so that a tune head search can be performed when reproduced later. Digital audio sources other than CD include DCC, minidisc, CD-
Various devices such as a PC and a BS tuner can be used, and various digital recording devices other than the DAT, such as a CD-R recording device and a mini disk system, can be used.

[0026]

[0027]

According to one aspect of the present invention , a digital audio source device simultaneously outputs a digital audio interface signal including X indicating an index and an analog audio signal obtained by D / A converting the digital audio signal to a digital recording device. The digital recording device records the digital audio signal obtained by A / D converting the analog audio signal input on a recording medium,
At this time, while X in the digital audio interface signal is zero, a digital audio signal indicating silence is recorded on a recording medium instead of a digital audio signal obtained by A / D conversion of an analog audio signal input. Thus, the interval between the songs is automatically silenced, and after recording is completed, the time and effort for searching for and erasing between the songs while reproducing the data can be saved.

[0028]

According to another aspect of the present invention , a digital audio interface signal output from a digital audio source device includes copy prohibition / permission information together with X indicating an index, and the digital recording device performs digital When the copy prohibition is determined from the copy prohibition / permission information in the audio interface signal, the digital audio signal obtained by A / D converting the analog audio signal input is recorded on a recording medium. X
While the analog audio signal input is A
Since the digital audio signal indicating silence is recorded on the recording medium instead of the digital audio signal obtained by the / D conversion, even if the user does not check whether the copying of the digital audio source is prohibited,
If copying is prohibited, digital recording is automatically performed based on the analog audio signal input, so that the user's effort is saved and the gap between the songs is automatically silenced. It saves time and effort to erase.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a digital recording system embodying a digital recording method according to the present invention.

FIG. 2 is an explanatory diagram of a digital recording operation.

[Explanation of symbols]

Reference Signs List 1 CD player 2 DAT 3 Coaxial cable 4 Pin code 5 DAI circuit 6 A / D converter 7 Signal processing circuit 8 Recording head 9 RF amplifier 10 Servo circuit 11 Operation / display panel 12 DAT tape 13 Controller

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuya Baba 1-2-5 Shibuya, Shibuya-ku, Tokyo Inside Kenwood Co., Ltd. (72) Koji Okawara 1-2-5 Shibuya, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Inventor Tetsuro Kino 1-2-5 Shibuya, Shibuya-ku, Tokyo Inside Kenwood Co., Ltd. (72) Inventor Hiroyuki Suzuki 1-2-5 Shibuya, Shibuya-ku, Tokyo Kenwood Co., Ltd. (56) References JP-A-4-143987 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 27/00-27/34 G11B 19/02 G11B 19/04 G11B 20/10

Claims (2)

(57) [Claims] 1. A digital audio source signal including an X indicating an index from a digital audio source device and a digital audio signal
The converted analog audio signal is simultaneously output to a digital recording device. The digital recording device records the digital audio signal obtained by A / D converting the analog audio signal input on a recording medium. The digital audio signal indicating silence is recorded on a recording medium in place of the digital audio signal obtained by A / D conversion of the analog audio signal input while X is zero. Digital recording method. 2. A digital audio interface device, comprising: a digital audio interface signal containing an X indicating an index from a digital audio source device;
The converted analog audio signal is output to a digital recording device at the same time. When the digital recording device determines that copying is prohibited based on the copy prohibition / permission information in the digital audio interface signal, the digital audio device inputs the analog audio signal to the A / D converter.
The digital audio signal obtained by the conversion is recorded on a recording medium. At this time, while X in the digital audio interface signal is zero, the digital audio signal obtained by A / D conversion of the analog audio signal input is recorded. Instead, a digital audio signal indicating silence is recorded on a recording medium.