JPH07109679B2 - Information recording method of recording / reproducing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a recording / reproducing apparatus for recording main information such as digital audio information, tracking control information, and subcode information such as a program number on a magnetic tape. Further, the present invention relates to an information recording method for forming a lead-in area in which predetermined information is recorded in an area before the program area at the start end of the magnetic tape when the magnetic tape is a non-recording tape.

(B) Conventional technology Conventionally, a rotary head type digital audio tape recorder (hereinafter referred to as R-DAT) is disclosed, for example, in the magazine "Electronic Life" (published by Japan Broadcasting Corporation), March 1987, pages 11 to 66. As described in, a magnetic tape is alternately helically scanned by a pair of rotary heads for recording and reproducing with different azimuth angles of the head cylinders, and a time-compressed PC is recorded at the center of each track of the tape.
Main information such as digital audio information consisting of M audio data is recorded, and tracking control information called ATF (Automatic Track Finding) signal and subcode information are recorded on both sides thereof in a time division manner. (See FIG. 5).

Further, in the R-DAT, as shown in FIG. 2, it is decided to leave 100 mm or more from the end of the leader tape at the beginning of the tape to the program area (26) where the actual program is recorded. Then, in the sub-code area of the lead-in area (27) before the program area, it is determined that "OBB" is recorded as a program number that changes for each data that is completed in terms of content. The lead-in area (27) is connected to the program area (26) continuously.
It is designed to record within 100 mm. Further, as the program number recorded in the subcode area of each track, the number as shown in FIG. 4 is recorded. That is, "OBB" is recorded in the lead-in area (27),
"001", "002", "003" in the area of each start ID (S-ID) of the second, third, and so on, and "OAA" indicating that the program number is invalid in other areas Each is recorded. Then, "OEE" is recorded in the lead-out area at the end of the tape.

(C) Problems to be solved by the invention When the lead-in area is not formed in front of the program area, the ATF signal is naturally not recorded in front of the program area. However, there is a problem that it takes time to play the first song because it takes time. In addition, during search operation, before the start ID (S-ID) signal of the first song,
If there is no ATF signal, it takes too much time for the search operation (cueing operation) of the first piece of music, and the sound is delayed. For after recording,
If the lead-in area is not formed, the ATF signal has poor consistency near the beginning of the program area, and there is a portion where after-recording cannot be performed. As a result, there was a problem that the start ID recorded before could not be erased and remained. Also, when the lead-in area is formed after the predetermined information is recorded in the program area, the ATF signal has poor consistency near the start edge of the program area and tracking is lost, and the servo cannot be applied well.
There was a drawback that it took time to play the first song.

(D) Means for Solving the Problems The present invention has been made with the above points in mind, and detects whether or not there is a recording signal in the lead-in area of the tape top when the magnetic tape is mounted, and the recording signal is detected. If there is no such information, the lead-in area in which the predetermined information "OBB" is recorded is formed, and subsequently, the area in which the program number invalid information "OAA" is recorded is formed in the predetermined section before the program area. An information recording method of a reproducing device is provided.

(E) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a specific system configuration example of an R-DAT using the present invention. (1) is an input terminal to which an information signal such as a voice signal is input, (2) is an interleaver for this information signal,
A digital signal processing circuit which adds an error correction code and converts it into a digital signal processed by time compression or the like, (3)
Is a subcode generation circuit that generates time information such as the song number and insulation time, and an information signal such as the start ID signal (S-ID) that indicates the beginning of the song and is used to find the beginning of the song. (4) Tracking control A servo signal generating circuit for generating a pilot signal and a sync signal for the recording, (5) is a recording amplifier, the output of the digital signal processing circuit (2), the output of the subcode generating circuit (3), the servo signal generating circuit (4) S-ID WRITE given from the control circuit (20) to the combined output of
A signal to which an information signal such as a signal is added is converted into a signal for time-division recording on a tape by a changeover switch (23). (6) is a rotary transformer for supplying the output from the recording amplifier (5) to the recording / reproducing magnetic head (7), (8) is a magnetic tape for recording a signal, and (9) is a reproducing amplifier,
(10) is a digital signal processing circuit that creates a PLL clock from the output from the reproducing amplifier (9), extracts a data signal, and further performs error correction and other processing to demodulate the original analog signal. (11) is a digital signal Subcode processing circuit that extracts information signals such as sampling frequency and number of quantization bits processed by processing circuit (10), subcode signals such as song number and time information, and (12) outputs demodulated analog signal Terminals, (13) and (16) are reel motors, (17) is a motor control circuit for controlling the reel motor, (1
4) is a capstan motor, (15) is a cylinder motor,
(18) is a motor control circuit for controlling the capstan motor (14) and the cylinder motor (15). (1
9) extracts the servo signal for tracking control from the output of the reproduction amplifier (9), and the motor control circuit (1
8) ATF servo circuit that sends tracking error signal to
(20) is a control circuit for controlling the entire apparatus, and the control circuit (20) is a motor control (17) (18) for the reel motor (13) (16), the capstan motor (14), and the cylinder motor (15). And a sub-code generation circuit (3), a servo signal generation circuit (4), a recording amplifier (5), a sub-code processing circuit () by controlling information from the key input terminal (21), the mechanical switch input terminal (22), etc. 11) control.
(43) is an RF envelope detection circuit.

The control circuit (20) is configured by system control using a microcomputer. The subcode processing circuit (11) is configured by using a subcode microcomputer or the like.

Then, when the normal recording mode of the tape (8) is set by the operation key signal of the input terminals (21) (22) and the mechanism detection signal, the tape (8) is set to the standard mode under the control of the control circuit (20). The cylinder (6) also rotates at the standard speed while traveling in the forward direction at the normal speed of 1x, and at this time the head (7)
(7) alternately scans the tape (8) helically.
At this time, the signal input from the input terminal (1) is processed by the digital signal processing circuit (2) and sent to the recording amplifier (5) together with the signals of the sub code generation circuit (3) and the servo signal processing circuit (4). And is recorded on the magnetic tape (8) through the rotary transformer (6) and the recording / reproducing magnetic head (7). At the time of reproduction, the signal recorded on the magnetic tape (8) is read by the recording / reproducing head (7), sent to the reproduction amplifier (9) through the rotary transformer (6), amplified, and further processed by the digital signal processing circuit (10). It is output as an analog signal from the output terminal (12).

FIG. 2 is a diagram showing the appearance of the tape start end portion. There is an area (26) where the program is recorded at a position 100 mm or more away from the end of the leader tape (24), and a lead-in area (27) is formed between the leader tape (24) and the program area (26). It When the cassette is loaded, that is, when the tape is loaded, tension is applied to the tape by the reel motor, the tape is stretched, and the rotary head cylinder is rotated at a constant speed to read the recording signal.
The presence / absence of the recording signal can be determined by detecting the presence / absence of the RF envelope signal from the envelope detection circuit (43). Further, the tape top is detected from the leader tape by a well-known means such as a tape position detecting means using an optical sensor, and it is determined whether or not there is a recording signal in the lead-in area of the tape top, and there is no recording signal. If
A lead-in area in which predetermined information is recorded is formed, and subsequently, an area in which information on the invalid program number is recorded is formed in a predetermined section before the program area. The third is a schematic flowchart of the operation by the control circuit (20) when mounting the tape.
Shown in the figure.

The operation of the embodiment of the present invention will be described below with reference to this flowchart.

First, when the tape is mounted on the R-DAT main body, the tape top [the tip (25) of the recordable portion (25)] is detected by a well-known tape position detecting means (not shown) (stepper 28). If it is the tape top, the tape is run at a capstan speed of 2-3 times up to point B in FIG. 2 (step 29). During that time, the control circuit (20) determines whether or not the signal has been recorded in the lead-in area (27) of the tape by the RF envelope exit signal from the RF envelope detection circuit (42) (step 30). . If recorded, stop the capstan motor (14) and stop the tape. If it is determined that the lead-in area (27) is a non-recording tape in a non-recording state, the tape (8) is rewound by capstan running at a speed of 2 to 3 times to point A in FIG. 2 (step 31), Then A
Predetermined information is recorded in the lead-in area (27) from point B to point B (step 32). That is, the program number "OBB", priority-ID "1", absolute time information (A time information), etc. are recorded in the subcode area (40) shown in FIG. An ATF signal is recorded in the tracking control information signal recording area (41). However, nothing is recorded in the time axis compressed signal recording area (42). The lead-in area (27) on which the specified signal is recorded in this way
Is formed for 33 frames, for example. Subsequently, the program number invalid information "OAA" is recorded from the point B to the point C which is a predetermined section before the program area (26) (step 33),
Stop the tape.

Next, if it is not the tape top, it is judged whether or not the tape (8) has been recorded by the presence or absence of the RF envelope exit signal from the RF envelope detection circuit (43) (step 34). If there is no recording signal, the tape (8) will be rewound at a constant speed with a capstan running (step 3
5) It is detected whether or not the rewound position is the tape top (step 36). If it is the tape top, proceed to step (29) to perform the same operation as described above. If it is not the tape top, the tape (8) is moved in the forward direction at a constant speed to return to the original position, and the tape is stopped (step 37).

When it is detected in step (34) that the tape (8) has been recorded, the program number recorded in the subcode area is "OB" by the signal from the subcode processing circuit (11).
The control circuit (20) detects whether or not it is "B" (step 3
8) If it is "OBB", the tape (8) is run at a constant speed up to point B in FIG. 2 (step 39). "OB
If it is not "B", stop the tape (8) as it is.

When the program signal is recorded in the program area after the above operation, the tape is rewound from each of the above positions with a small amount of rewind, and then the recording operation is started.

In this way, when the magnetic tape is a non-recording tape, a lead-in area in which a predetermined signal is recorded is formed in the area before the program area at the beginning of the tape.

In the above embodiment, an example in which the rotary head type digital audio tape recorder is used has been described, but the present invention is not limited to such an embodiment and may be applied to, for example, a fixed head type digital information recording / reproducing apparatus. .

(F) Effects of the Invention As described above, in the information recording method of the recording / reproducing apparatus of the present invention, when the magnetic tape is mounted on the main body of the apparatus, it is determined whether or not there is a recording signal on the magnetic tape at the leading end of the magnetic tape. Is detected, and when there is no recording signal, a lead-in area in which a predetermined signal is recorded is formed in the area before the program area. Therefore, for example, the program number "OBB" indicating the lead-in area is recorded in the sub-code area of the lead-in area, and the ATF signal is recorded in the tracking control information signal recording area. When mounted on the main body, the ATF signal is matched even near the beginning of the program area, and the tracking operation starts immediately and the first program (for example, the first song) can be quickly reproduced. In addition, since the predetermined information is recorded in the predetermined area of the program area after the lead-in area is formed, the ATF signal has good consistency near the beginning of the program area. From this point as well, the first program can be quickly reproduced. can do. Further, since the ATF signal for tracking control is present before the start ID signal of the first song during the search operation, the search operation (cueing operation) time can be shortened and the sound can be produced quickly. Furthermore, even after recording near the beginning of the program area, the ATF signal is matched, so there is no risk that after recording will not be possible at the tip of the program area.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a schematic diagram of a tape, FIG. 3 is a flowchart for explaining the operation, FIG. 4 is an internal configuration diagram of the tape, and FIG. It is a figure which shows the recording track format of R-DAT with the principal part enlarged view of a figure. (8) …… Magnetic tape, (9) …… Playback amplifier, (20)
...... Control circuit, (27) ...... Lead-in area, (26) ...
… Program area.

Claims (1)

[Claims] 1. An information recording method of a recording / reproducing apparatus for recording and reproducing main information such as digital audio information, tracking control information, and subcode information such as program number on a magnetic tape, and whether or not it is a tape top. If it is judged that it is the tape top, it is detected whether there is a recording signal in the lead-in area, and if there is no recording signal, a lead-in area in which the predetermined information “OBB” is recorded is formed. Then, an information recording method of the recording / reproducing apparatus, characterized in that an area in which the information "OAA" of the program number is recorded is formed in a predetermined section before the program area.