JPH0697521B2 - Start ID recording method for digital recording / playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a start ID recording method for a digital recording / reproducing apparatus such as a DAT apparatus (digital audio tape apparatus).
Particularly, the present invention relates to a start ID recording method suitable for recording from a CD.

<Prior Art> The DAT device is capable of high-quality recording / reproduction of an audio signal, high-speed search of a desired song, random play, intro scan, and the like. These high-speed search, random play, intro scan, etc., indicate the start of the song written on the recording track of the PCM audio signal.
It is performed by detecting the reproduction of data called "ID" by the recording / reproducing head of the PCM audio signal.

This start ID has already been recorded by the software maker on a commercially available music tape (soft tape). With tapes (user tapes) other than soft tapes, when a user records a song from a record, CD, FM broadcast, etc., the start ID can be recorded manually or automatically.

In the case of manual recording of the start ID, it is possible to record the start ID by pressing the "start ID key" provided on the DAT device at the start position of the song. If the start key automatic recording mode is pressed by pressing the auto key provided at, the start ID is automatically recorded by detecting the beginning of the song in consideration of the audio signal level and the blank time.

This automatic start ID recording method is convenient when recording multiple songs in succession from a CD.

<Problems to be Solved by the Invention> By the way, in the conventional start ID automatic recording method,
The music interval is detected when the audio signal level is continuously lower than the predetermined level for a predetermined time, and the start ID is recorded when the audio signal level becomes higher than the predetermined level after the music interval is detected.

However, in such a method, the start ID position may be shifted due to the level of being considered as blank, the blank time being considered as being between songs, or due to the influence of noise, etc. Sometimes it was not done.

In view of the above, an object of the present invention is to provide a start ID recording method capable of accurately detecting a music head and recording a start ID without using an audio level or a blank time.

<Means for Solving the Problems> FIG. 1 is a block diagram of a main part of a DAT device according to the present invention.

Reference numeral 11 is a subcode Q extraction unit that detects subcode Q channel data, 12 is a music beginning detection unit that detects a music beginning using predetermined information included in the Q channel data, 14 is a signal processing unit, and DAI is digital audio. It is an input terminal.

<Operation> When the source of music information is a CD, the digital output signal output from the CD player is received via the digital audio input terminal DAI of the DAT device, and the subcode Q extraction unit 11
And the subcode Q included in the digital output signal
The channel data is extracted, and the music head detecting section 12 provides predetermined information (for example, music number information) included in the Q channel data.
The beginning of the music is detected based on the above, and the start ID is recorded on the magnetic tape 17 by the signal processing unit 14 by the detection of the music head.

<Embodiment> FIG. 1 is a block diagram of essential parts of a DAT device according to the present invention.

DAI is a digital audio input terminal to which a digital output signal output from a digital audio source (CD player, satellite broadcasting, DAT) is input, and 11 is a sub output included in the digital output signal output from the digital output terminal of the CD player. It is a sub-code Q extraction unit that extracts code Q channel data.

As shown in Fig. 2, the subcode Q channel data is the track number (MNR), index (IX), minute (MIN), second (SEC), frame (FRAME), and elapsed time from the beginning of the track. Minutes (AMIN) that indicate (cumulative time), seconds (ASE
C), frame (AFRAME), etc. Incidentally, Q
The channel data includes other address code, control code, and check code.

Returning to FIG. 1, reference numeral 12 is a music head detecting section for detecting a music head by using predetermined information included in Q channel data, and 13 is a digital audio signal generating section. This digital audio signal generator 13 cannot perform digital dubbing if the input digital audio signal contains a copy prohibition code.
It is converted, and then AD converted again to a digital audio signal and output.

14 is a signal processing unit, 15 is an amplifier, 16a and 16b are the first and second recording / reproducing heads, 17 is a magnetic tape, 18 is a system control unit, 19
Is a tape running control unit, and 20 is an operation panel.

During recording, the signal processing unit 14 uses a sub code (Start I) together with a digital audio signal (PCM audio signal).
D, time code, program number, etc.) is output to the recording / reproducing head, and at the time of reproduction, error detection / correction processing is performed on the PCM audio signal input from the recording / reproducing head and output to the acoustic circuit. Are separated and input to the system control unit 18.

The system control unit controls the entire DAT device,
For example, the tape running control and the cassette loading control are performed, and the display of the operation panel 20 is controlled to display the program number, elapsed time, and the like.

The operation panel 20 is provided with various keys and a display unit.
For example, as the key, the start ID manual key 20a that records the start ID at an arbitrary position each time it is pressed or the start ID auto key that automatically records the start ID at the beginning of the song
20b etc. are provided.

The start ID recording method according to the present invention will be described below.
The start ID auto key 20b is pressed to set the start ID automatic recording mode. Further, the digital audio input terminal DAI is designed so that a digital output signal from a CD player (not shown) is input. Incidentally, CD
Whether or not the output is from can be automatically determined by the category code.

When the digital output signal from the CD is input through the digital audio input terminal DAI, the subcode Q extraction unit 11 extracts the subcode Q channel data (see FIG. 2) included in the digital output signal. And input it to the beginning of the track detecting section 12.

The song head detecting section 12 detects the beginning of the song based on predetermined information included in the Q channel data, and outputs a start ID recording enable signal IDR to the signal processing section 14. As a method of detecting the beginning of a song, the following 5 (i) to (v) are used.
There are two possible ways. That is, (i) the song number (MNR) included in the Q channel data (Fig. 2) is counted up at the beginning of the song. (Ii) The playing time and frame (MIN, SEC, FRAME) of the song included in the Q channel data are all zero at the beginning of the song, so MIN = 0, SEC = 0, FRAME = 0 (Iii) The index indicating the movement of the song included in the Q channel data is "01" at the beginning of the song, so the index
The beginning of the song is detected when IX = 01, (iv) The beginning of the song is detected because the index of the song included in the Q channel data has changed (the beginning of the movement is regarded as the beginning of the song). The part 20 may be provided with an on / off changeover switch so that the movement can be regarded as a start point or not.

(V) The beginning of the music is detected when the total elapsed time (AMIN, ASEC, AFRME) included in the Q channel data becomes equal to the performance start time of each music obtained from the table of contents (TOC information) of the CD. As shown in Fig. 3, the table of contents of the CD is
Performance start time (PMIN, PSEC, PF) of each track number (01, 02, ... ML)
RAME), the first song number Ms, the last song number ML, etc. are recorded. The TOC information is first sent from the CD player as a digital output signal and stored in the subcode Q extraction unit 11.

When the start ID recording enable signal IDR is input, the signal processing unit 14 PCM the start ID signal for a predetermined time (9 seconds).
It is output together with the audio signal (output of the digital audio signal generator 13), and the recording / reproducing heads 16a and 16b are used to write it on the magnetic tape 17.

When the input signal is an analog signal or a digital audio signal other than a CD player, the start ID is automatically recorded by the same means as the conventional one.

<Effects of the Invention> According to the present invention, when the source of the music information is a CD, the subcode Q channel data included in the digital output signal output from the digital output terminal of the CD player is extracted, Since it is configured to detect the beginning of the song by using the Q channel data and record the start ID, it is possible to accurately detect the beginning of the song and record the start ID without using the audio signal level or blank time. it can.

[Brief description of drawings]

 FIG. 1 is a block diagram of a main part of a DAT device according to the present invention, FIG. 2 is an explanatory diagram of subcode Q channel data, and FIG. 3 is an explanatory diagram of TOC information of a CD. 11 …… Sub-code Q extractor, 12 …… Song start detector, 14 …… Signal processor, DAI …… Digital audio input terminal

Claims (6)

[Claims] 1. A start ID recording method for a digital recording / playback apparatus for recording music information while automatically recording a start ID at the beginning of a song, wherein the source of music information is a CD, the digital output of a CD player is used. Information of the sub-code Q channel included in the digital out signal output from the audio player is detected, the beginning of the song is detected by using the Q channel data, and the start ID is detected.
A start ID recording method for a digital recording / reproducing device, which is characterized by recording 2. A start ID recording method for a digital recording / reproducing apparatus according to claim 1, wherein the music head is detected when the music number included in the Q channel data has changed. 3. The start of a digital recording / reproducing apparatus according to claim 1, wherein the beginning of a music piece is detected when the playing time and the frame of the music piece included in the Q channel data are all zero. ID recording method. 4. A music head is detected when the total elapsed time included in the Q channel data is equal to the performance start time of each music obtained from the TOC information of the CD. The method for recording the start ID of the digital recording / playback device according to item 1. 5. The start ID recording of the digital recording / reproducing apparatus according to claim 1, wherein the beginning of the music piece is detected when the music piece index included in the Q channel data becomes "01". Method. 6. A start ID recording method for a digital recording / reproducing apparatus according to claim 1, wherein the beginning of the music piece is detected when the index of the music piece included in the Q channel data is changed.