JPH0548262Y2 - - Google Patents

Description

[Detailed Description of the Invention] BACKGROUND OF THE INVENTION The present invention relates to an information recording and reproducing apparatus such as a rotary head type digital audio tape recorder.

BACKGROUND ART As a digital audio device, a playback-only disk player called a so-called compact disk that plays back small-diameter disks is known, but recently, digital audio devices that have both recording and playback functions are known. Tape recorders (hereinafter abbreviated as DAT) are becoming commercialized.

In a rotating head DAT, which is one type of DAT, the recording tracks on the magnetic tape are formed diagonally by the rotating head, and the recording track is formed diagonally by the rotating head.
ATF for tracking outside the data area
(Automatic Track Finding) One track is composed of a signal area and a sub-coat signal area outside the signal area. And each area is
Separated by IBG (Inter Block Gap),
It can be written and rewritten independently, and is compatible with after-recording (hereinafter abbreviated as dubbing). In order to enable dubbing, the DAT is provided with a dubbing operation key, and if the operating mode of the operation is a mode that allows dubbing (for example, playback mode), it accepts key input from the dubbing operation key. After-recording of the subcode signal is performed.

By the way, in a rotary head type DAT, there may be an unrecorded portion of the RF signal between a plurality of pieces of program information (so-called between songs) written on the magnetic tape. In this way, on a magnetic tape where an RF unrecorded section exists, the dubbing operation based on the key input of the dubbing operation key is started from the RF recording section,
If an RF unrecorded area is reached during this dubbing operation, subcode dubbing is possible even in the RF unrecorded area, so only the subcode area exists in the RF unrecorded area, and the ATF area and P.C.M.
A pattern for which no data area exists, that is, a pattern that does not conform to the track format of the rotary head type DAT, will be recorded. Moreover, even if only the subcode area is recorded,
Since it is theoretically possible to read subcodes, problems such as detection of meaningless recording areas occur during a search operation for quickly searching for desired program information.

Summary of the invention This invention was created in view of the points mentioned above.
An object of the present invention is to provide an information recording/reproducing device that can prevent a pattern not conforming to the track format of a rotary head type DAT from being recorded.

The information recording and reproducing device according to the present invention detects whether or not an RF signal is included in the reproduction symbol from the magnetic tape during the dubbing operation based on the key input of the dubbing operation key, and detects whether or not the RF signal is included in the unrecorded section of the RF signal. In addition to the subcode signal as the identification signal, the ATF signal and predetermined program signal as the control signal are also recorded.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing one embodiment of a rotary head type DAT, which is an information recording/reproducing apparatus according to the present invention. In the figure, reference numeral 1 denotes a deck mechanism section, and a cassette 3 containing a magnetic tape 2 is attached to the mechanism section. The magnetic tape 2 is pulled out from the cassette 3 and placed between a pair of rotating magnetic heads 4.
It is wound about 90 degrees around a rotating drum 5 having a and 4b. The magnetic tape 2 is driven by the capstan 6 and the pinch roller 7 when the magnetic tape 2 is running at a normal recording/reproducing speed or at a medium speed that is more than 10 times that speed, and when the magnetic tape 2 is running at a high speed that is 200 times faster, for example. is driven by the supply reel motor 8 or the take-up reel motor 9. The starting and ending ends of the magnetic tape 2 are detected by detection circuits 10 and 11. The changeover switch 12 is switched to the a side during reproduction and to the b side during recording, and the switching control is performed by a control circuit 13, which will be described later.

In the playback mode, the pair of rotating magnetic heads 4
The signals read from the magnetic tape 2 by the signals a and 4b are taken out to the outside via a rotary transformer (not shown) and supplied to the reproduction amplifier 14 via the changeover switch 12. The read signal amplified by the reproduction amplifier 14 is sent to the demodulation/decoding circuit 15 and the RF
The signal is supplied to the detection circuit 16. The demodulation/decoding circuit 15 performs signal processing such as decoding, error correction, and deinterleaving of the read signal. The read data that has undergone these processes is sent to the D/A converter 17.
is converted to analog and output as the original audio signal. The RF detection circuit 16 has an envelope detection circuit configuration, and detects whether or not an RF signal is included in the read signal, and when it detects that the RF signal is not included, detects a high level during that detection period. Output a signal. This detection signal is supplied to the control circuit 13.

In the recording mode, an analog audio signal input from the outside is digitized by the A/D converter 18 and supplied to the signal processing circuit 19. The signal processing circuit 19 further includes a start signal as a subcode signal (identification signal) from the signal generation circuit 20.
An ID signal, a skip ID signal and a program number signal are provided. In addition to these subcode signals, the signal generating circuit 20 is configured to be able to generate, for example, a zero level data signal as a PCM audio signal (program signal) when a control signal is input from the control circuit 13. The type and output timing of the signal output from the signal generation circuit 20 are controlled by the control circuit 13. The signal processing circuit 19 has its signal processing timing controlled by the control circuit 13, and outputs various input signals and digital audio signals as signals in a predetermined format. The output signal of the signal processing circuit 19 is amplified by a recording amplifier 21, and then supplied to the rotating magnetic heads 4a, 4b via a changeover switch 12, and recorded on the magnetic tape 2. Recording amplifier 2
1, an ATF signal outputted from an ATF signal generating circuit 22 and serving as a control signal during reproduction is time-division multiplexed so that recording is performed in a predetermined track area. The output timing of the ATF signal is controlled by the control circuit 13.

The control circuit 13 is composed of a microcomputer, etc., and includes tape start and end detection circuits 10 and 1.
control of the decking mechanism section 1 based on the detection output etc. of 1;
Switching control of changeover switch 12, signal processing circuit 1
9, the selection and output timing of the signal to be output from the signal generation circuit 20, the output timing of the ATF signal to the ATF signal generation circuit 22, etc. Furthermore, when the operation mode of the apparatus is a mode in which dubbing is permitted (for example, playback mode), when a key input is made to the dubbing operation key 23 that instructs dubbing of a subcode signal, the processing timing for the signal processing circuit 19 is determined. control and signal generation circuit 2
In addition to controlling the output timing of the subcode signal for 0, when the detection signal is supplied from the RF detection circuit 16, that is, in the unrecorded section of the RF signal, not only the subcode signal but also the subcode signal is output.
to the ATF signal generation circuit 22 in order to record the ATF signal and zero level PCM audio signal as well.
ATF signal output timing and signal generation circuit 2
Controls the output timing of the zero level PCM audio signal relative to 0.

Next, the procedure of the post-recording operation executed by the processor of the control circuit 13 will be explained with reference to the flowchart of FIG.

When the operation mode of the apparatus is in the playback mode in which dubbing is permitted, for example, when there is a key input from the dubbing operation key 23 (step S1), the processor first starts measuring the dubbing time (step S1).
S2). This post-recording time is measured, for example, by setting a predetermined value n in a built-in counter and counting down by one in synchronization with a count clock. The dubbing time is determined by the set value n and the cycle of the count clock.

Subsequently, by sensing the output of the RF detection circuit 16, it is determined whether there is an RF signal or not.
Determine whether it is the signal recording section (step
S3), if it is an RF signal recording section, the changeover switch 12 is switched to the b side, and the processing timing for the signal processing circuit 19 and the output timing of the subcode signal for the signal generation circuit 20 are controlled (step S4). ). The changeover switch 12 is on the b side only during the period when a subcode signal write command is being issued, and is switched to the a side at other times, that is, during reproduction. continue,
The dubbing time that started measurement first has passed (n=
0) (step S5), and if the time has not elapsed, the process returns to step S3; if the time has elapsed, the dubbing operation is ended. By this operation, post-recording of the subcode signal to the subcode signal area is performed.

During the dubbing operation, if it is determined in step S3 that there is no RF signal, that is, it is an unrecorded section of the RF signal, the selector switch 12 is switched to the b side, and the processing timing for the signal processing circuit 19 is controlled. Signal generation circuit 22
The output timing of the ATF signal and the output timing of the subcode signal and zero level PCM audio signal to the signal generation circuit 20 are controlled (step S6). Next, it is determined whether or not the dubbing time that was previously measured has been reached (n=0) (step S7). If the dubbing time has not elapsed, the process returns to step S6, and if it has elapsed, the dubbing operation is started. finish. This action causes
In the unrecorded portion of the RF signal, not only the subcode signal but also the ATF signal and the zero level PCM audio signal, which serve as control signals during reproduction, are recorded in a predetermined format. This operation corresponds to a normal recording operation. With the above operation,
This makes it possible to prevent a pattern that does not conform to the track format of the rotary head DAT from being recorded on the magnetic tape 2.

In the above embodiment, the recording operation is started immediately after the detection of the RF unrecorded part, but in consideration of overrun etc., once the RF unrecorded part is detected, the reverse operation is performed for several frames (or several tracks). It is also possible to configure the recording operation to proceed after a certain time.

In addition, in the above embodiment, since the recording and reproducing heads are also used, the subcode signal,
Although the presence or absence of an RF signal is not monitored during the dubbing operation of ATF signals and PCM data signals, if the recording and playback heads are separately provided, the presence or absence of the RF signal is not monitored during the dubbing operation of the subcode signal. It is also possible to monitor the presence or absence of RF signals.

Effects of the invention As explained above, according to the invention, it is possible to detect whether or not an RF signal is included in the reproduced signal from the magnetic tape during the dubbing operation, and to identify the unrecorded section of the RF signal. Since it is configured to record not only the subcode signal but also the ATF signal and predetermined program signal as control signals, it is possible to prevent patterns that do not conform to the track format of the rotary head DAT from being recorded. This can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a flowchart showing the procedure of the post-recording operation executed by the processor of the control circuit in FIG. Explanation of symbols of main parts, 1... Deck mechanism part,
2... Magnetic tape, 4a, 4b... Rotating magnetic head, 5... Rotating drum, 13... Control circuit, 15
...Demodulation/decoding circuit, 16...RF detection circuit,
19... Signal processing circuit, 23... Dubbing operation key.

Claims (1)

[Scope of utility model registration request] A recording/reproducing means for recording and reproducing information on a magnetic tape; and a detecting means for generating a detection signal by detecting that a radio frequency (RF) signal is not included in a reproduction signal outputted from the recording/reproducing means. , signal generating means for generating predetermined identification signals, control signals and program signals; command means for instructing recording of the identification signal on the magnetic tape;
control means for controlling the signal generating means to supply the identification signal to the recording and reproducing means in response to a command from the command means, the control means controlling the signal generating means during a recording operation based on the command from the command means; The information recording and reproducing apparatus is characterized in that the signal generating means is controlled so as to supply the control signal and the program signal to the recording and reproducing means together with the identification signal during the generation period of the detection signal.