JPH0196848A - Recording system for rotary head type tape recorder - Google Patents

Abstract

PURPOSE:To prevent the influence due to the response delay, etc., of a mechanism by rewinding a tape for a constant period after the information signal of the last track is stored and stopping the tape when a recording is interrupted and restarting the recording at the coincident point of reproducing information and storing information when the recording is restarted. CONSTITUTION:When the recording is interrupted, a sound signal after the last track is PCM-demodulated is stored in an internal memory 25 of a microcomputer 23 by a digital signal processing circuit 2, and after that, the tape is rewound for a constant time and stopped. When the recording is instructed again by an operating key 26, a reproducing mode is set, and a servo signal and the sound signal are reproduced by a digital signal processing circuit 10. A tracking control is executed by a tracking error signal generated from the reproduced servo signal through a motor driving circuit 20. Further, the coincidence of the reproduced sound signal and the stored sound signal is decided by a deciding circuit 25, and the recording is restarted at a point where the both sound signals coincide.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a recording system for a rotary head type tape recorder.

(b) Conventional technology Conventionally, in a rotary head digital audio tape recorder (R-DAT), an information recording area is formed at the center of the trace of each track of a tape that is helically scanned by a rotary head, and this information is A tracking area and a subcode area are formed on both sides of the recording area, that is, at the trace start end and the trace end of each track.

Then, at the time of recording, in the recording area of this information, the t-reporter number such as voice converted into a digital signal is recorded,
The tracking area recorded a servo signal for tracking control, and the subcode area recorded a star 1-rD for high-speed search, as well as subcode signals such as track number and time information. Here, the time information includes an absolute time and an opening time, and the absolute time is the time from the beginning of the tape to the current tape position, and the one-song time is the time from the beginning of the song to the current tape position.

(c) Problems to be solved by the invention However, in such an R-DAT, when recording is interrupted (stopped or paused) and then recorded again, there are problems such as delayed response of the mechanism, overrun, backlash, etc. Due to the influence of disturbances, etc., it was difficult to quickly read the f&last track at the end of the previous recording to form a new rack (so-called splicing).

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms a tracking area and a sub-code area along with an information recording area in each track of a tape that is helically scanned by a rotating head. At the time of recording, information signals such as audio converted to digital signals are recorded in the information recording area, and a servo signal for tracking control is recorded in the tracking area, and subcode signals such as time information are recorded in the subcode area. A rotary head type tape recorder that records information, and when recording is interrupted, the information signal to be recorded in the information recording area of the last track is memorized, and then the tape is rewound for a certain period of time, then stopped, and when recording is started again. is set to the playback mode from the time of rewinding, and plays back the servo signal from the tracking area of the already recorded track and the information Ig from the information recording area, and performs tracking control using the played back servo signal. In addition, the reproduced information signal is matched with the stored information signal, and from the time of the match, the recording mode is set and new recording is performed.

(E) Effect: In the recording method of the present invention described above, even if recording-interruption-recording is repeated, continuous recording can be performed accurately without being affected by response delay of the mechanism, over-temperature, backlash, disturbance, etc. It is possible to

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

That is, FIG. 1 shows a specific system configuration example of the R-DAT used in the present invention, where (1) is an input terminal into which analog audio No. 18 is input, and (2) is an input terminal for interleaving this audio signal. Convert to digital signal with time compression, etc. (PC
(3) is a servo signal generation circuit that generates a servo signal (i.e., pilot signal, sink No. 3, etc.) for tracking control, (4)
) is a sub-code signal generation circuit that generates sub-number 118 such as track number and time information along with the start ID for high-speed search, and (5) is a tracking area, an information recording area formed on each track of the tape. A switch circuit that is selectively switched at a predetermined timing to record digitally converted audio signals, servo signals, and subcode signals in the area and subcode area, (6) is a recording amplifier, and (7) is a recording amplifier (6). ) is a rotary transformer of a rotary head cylinder that supplies the output from the two recording/reproducing rotary heads (8) 180° apart, (9) is a playback amplifier, and (10) is a rotary transformer that supplies the output from the playback amplifier (9). A digital signal processing circuit generates a clock from data using a PLL or the like, converts it into a digital signal, and then converts it into an analog signal (PCM demodulation). (11) is an output terminal from which the original analog audio signal is output. (12) is a playback amplifier (9)
A servo circuit that extracts a servo signal for tracking control from the output of and generates a tracking error signal, (1)
3) is a subcode processing circuit that extracts a subcode signal from the output of the reproduction amplifier (9) and detects the start ID and reads time information and the like. (14) is a take-up motor that directly drives the take-up reel shaft; (15)
) is the supply reel motor that directly drives the supply reel shaft, (
16) is its motor drive circuit, (17) and (18) are the cylinder motor and its motor drive circuit, (19) and (20)
) is the capstan motor and its motor drive circuit.

And (21) is various operation key manual power and digital signal processing circuit <2) (10), sp code processing circuit (13)
Each motor (14) (15) (17) (
19) is a control circuit for controlling drive/stop, rotation speed, rotation direction, etc.; (22) is a tape wrapped 90' around the rotating head cylinder.

Therefore, during recording, the audio signal input to the input terminal (1) is converted into a digital signal by the digital signal processing circuit (2), and then the servo signal (pilot signal or sync signal) is output from the servo signal generation circuit (3). etc.) and the subcode signal (start ID, track number, time information) generated by the subcode generation circuit (4), and are sent to the recording amplifier (6) in a time-division manner. The output of this recording amplifier (6) is then transferred to the rotary transformer (7) of the rotating head cylinder.
The recorded data is sent to the tape and recorded on the tape by the recording/reproducing rotary head (8). At this time, the second
A track pattern as shown in the figure is formed, with an information recording area (D) in the center of each track, and tracking areas (Ts) (Te) and subcode areas (Ss) (Se) on both sides. will be formed.

Next, during playback, various signals recorded on the tape (22) are read by the recording/playback rotary head (8) and sent from the rotary truss (7) of the rotary head cylinder to the playback amplifier (9). It will be done. The output of this reproducing amplifier (9) is then outputted to the digital signal processing circuit (10).
A clock is generated from the data using L, etc., and the data is converted into a digital signal, and then converted into an analog signal, which becomes the original audio signal and is output from the output terminal (11). Furthermore, the output of this reproduction amplifier (9) is sent to the servo circuit (12), where the servo for tracking control extracts the signal and generates a tracking error signal, which is sent to the motor drive circuit. (20) to control the capstan motor (19). In addition, the output of the playback amplifier (9) is also sent to the subcode processing circuit (13), where the subcode signal is extracted and the track number, time information, etc. are read and displayed on the display section via the control circuit (21). The playback, track number and time are displayed.

Next, the operation during splice recording will be performed according to the time chart shown in Fig. 3, and specifically, the control circuit (21) for splicing recording will be operated as shown in Fig. 4. It consists of a microcomputer (23), and (24) stores the PCM-modulated audio signal recorded in the information recording area of the last track when recording is interrupted by the digital signal processing circuit (2). Internal memory (25) is a determination circuit that determines whether the audio signal stored in the internal memory (24) matches the audio signal before PCM demodulation extracted by the digital signal processing circuit (10) during playback; (26) are operation keys for specifying various operations such as recording, playback, and continuous recording. Therefore, when you instruct to stop at - time during recording using the I operation key (26), the microcomputer (23) will control each motor drive circuit (16) (18).
) (20) and a record (not shown)/The playback circuit is controlled and the recording ends at point a shown in FIG.
After the modulated audio signal is stored in the internal memory (24) by the digital signal processing circuit (2), the tape is rewound for a certain period t0 and then stopped at the point shown in Figure 3. Note that this tape rewinding is performed by capstan driving, which rotates the capstan motor (19) and reel motors (14) and (15) in the opposite direction while keeping the pinch roller pressed against the capstan shaft. After this, press the operation key (
26) instructs recording again, the microcomputer (23) instructs the pinch roller to press the capstan shaft, and the capstan motor (19) and reel motor (14>(15) complete their forward rotation. At the time of rewinding, the tape is set to the playback mode and driven in the direction of the arrow, and the servo signal is played back from the trunking area of the already recorded track, and the audio signal is played back from the information recording area.Then, Tracking control is performed by supplying a tracking error signal generated based on the reproduced servo signal to the motor drive circuit (20), and during this reproduction period, the recording/reproducing rotary head (8) matches the recorded track pattern. It controls the running of the tape (22) so that the reproduced audio signal matches the audio signal stored in the internal memory (24).
5), and if it is determined that the two audio signals match at the previous recording end point a, the recording mode is set from the matching point a, and 3! ! Subsequently, new recording will be performed. That is, before a new recording is performed, the mechanism and servo system are driven by setting the playback mode - and since the recording/playback main rotary head is under tracking control, at the coincident point a, the Just by electrically switching the rotary head from playback to record mode, the recording mode is immediately set, and continuous recording is performed by quickly reading to the last track at the end of the previous recording by stopping at - to form a new track. It is possible to

(G) Effects of the Invention As described above, according to the recording method of the present invention, it is possible to accurately grasp the splicing point using the information signal recorded in the subcode area, and it is also possible to determine the mechanism drive and timing in advance. Since tracking control is performed, even if recording-interruption-recording is repeated, continuous recording can be performed accurately without being affected by mechanism response delay, over-temperature, backlash, disturbance, etc. .

[Brief Description of the Drawings] Figure 1 is a system configuration diagram of R-DAT used in the present invention;
FIG. 2 is a track pattern diagram thereof, FIG. 3 is a timing chart during continuous recording, and FIG. 4 is a diagram showing a specific example. (2) (10)...Digital signal processing circuit, <21
)...control circuit, (24)...internal memory, (2
5)...Judgment circuit.

Claims (1)

[Claims] (1) A tracking area as well as an information recording area on each track of the tape that is helically scanned by a rotating head;
A subcode area is formed, and at the time of recording, information signals such as audio converted to digital signals are recorded in the information recording area, and servo signals for tracking control are recorded in the tracking area, and time information etc. are recorded in the subcode area. This is a rotary head type tape recorder that records the sub-code signal of 1. When recording is interrupted, the information signal to be recorded in the information recording area of the last track is memorized, and then the tape is rewound for a certain period of time, then stopped, and then restarted. When recording, from the time of rewinding, the mode is set to playback, and the servo signal is played back from the tracking area of the already recorded track, and the information signal is played back from the information recording area, and tracking is controlled using the played back servo signal. A rotary head type tape recorder characterized in that the reproduced information signal and the stored information signal match each other, and from the time of the match, the recording mode is set to start new recording. Recording method.