JPS599978B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device equipped with a recording canceller.

5. When performing an air check or the like with the above-mentioned magnetic recording/reproducing apparatus, that is, when recording an unknown source, we often encounter the following problems once the recording state has been established.

(c) I started recording thinking it was the best source, but by the time I
When this sauce was disappointing, (2
) When I decided that the narration, commercials, etc. had finished, I started recording, thinking that my favorite source would start, but then it continued to be an array 15, commercial, etc., or the source was completely disappointing. (3) When you feel like you've missed your first chance to record something like "live recording."

In the above case, it is desirable to quickly rewind the tape to the recording start position on the magnetic tape within a short period of time, and then put the tape into the recording/pause state again in preparation for the next recording opportunity.

However, as described above, it is difficult to find the recording start position on the magnetic tape pattern. Furthermore, even if you successfully find the above-mentioned recording start position, you must immediately set the device's operation mode to record/pause, and these operations must be performed in a short period of time without losing the next recording opportunity. It requires considerable skill to do it properly and in a timely manner. 30 The present invention has been made in view of the above-mentioned circumstances, and even if the above-mentioned inconvenience occurs during recording such as the above-mentioned air check, the above-mentioned recording start position on the magnetic tape can be changed with one-touch operation. To provide a magnetic recording/reproducing device which can automatically search for the next recording opportunity in a short time, put the device on standby in a recording/pause state, and prepare for the next recording opportunity.

J Hereinafter, an embodiment of the magnetic recording/reproducing apparatus according to the present invention will be described with reference to the drawings. First, the outline of the apparatus will be explained using the program diagram of the apparatus shown in FIG.

Assume that the mode selector of this device is set to the recording/playback mode and recording of a signal is started.

At this time, if it is determined that the signal (source) is not desired to be recorded, the recording state can be canceled by pressing a button or the like provided on the start circuit 1. The outline of the operation of the apparatus at this time is as follows. That is,
When a rewinding instruction is given in the recording state (activating the start circuit 1), the recording state is automatically canceled and the rewinding operation is performed. While this rewinding operation continues, the detection head etc. is used to detect between songs (areas where a signal is recorded and where the signals are not recorded), and the song breaks (areas where no signals are recorded) are activated. ) is detected, the device automatically stops, and then the mode selector of the device is set to the recording/pause state to prepare for the next recording. When the start circuit 1 shown in FIG. 1 is activated, the output from the start circuit 1 is supplied to the rewind command circuit 2, and the recording state is canceled by driving the rewind command circuit 2, and the recording state continues. Rewind 2 operation continues.

On the other hand, the output from the start circuit 1 is supplied to a gate circuit 3, and a memory circuit 4 (comprised of flip-flops, The recording/reproduction mode is stored.) The gate circuit 3 is configured to select the recording/reproduction mode. Furthermore, during the rewinding period described above, a portion of the magnetic tape where no signal is recorded is detected by a detection head or the like, and a no-signal detection pulse obtained by this detection is supplied to the gate circuit 3. be done. 3 In this gate circuit 3, the logical product of the signals sent from the start circuit 1, the memory circuit 4, and the signal discrimination circuit 7 to be described later is taken and outputted.

When the no-signal detection pulse from the signal discrimination circuit 7 is applied to the gate circuit 3, the output drives the rewind release circuit 8, and the rewind set pulse from there drives the rewind release circuit 8. Operation is stopped.

Furthermore, as the rewind release circuit 8 is driven, the recording/pause command circuit 9 is driven, and the recording/pause command pulse from this sets the device itself to the recording/pause state, and the next Preparation for recording is completed. The above-mentioned no-signal detection pulse, which is obtained by detecting the portion on the magnetic tape where no signal is recorded, is obtained as follows. During the above-described rewind operation period when recording is canceled, the detection head 5 is activated. It should be noted that although a head exclusively for detection may be provided as the detection head 5, the purpose can also be achieved by using the reproduction head also as the detection head 5. The pickup output from the detection head 5 is first amplified appropriately by an amplifier 6 and then supplied to a signal discrimination circuit 7. This signal discrimination circuit 7
is composed of a comparator using an operational amplifier, and the reference voltage of the comparator and the pickup output voltage from the detection head 5 are compared. and,
In the part of the magnetic tape where signals are not recorded,
When the pick-up output from the detection head 5 described above decreases rapidly and becomes lower than the reference voltage described above, the output of the comparator is inverted, and this inverted output is applied as a no-signal detection pulse to the gate circuit 3 described above. The series of actions described above are carried out to achieve the objectives of the period. FIG. 2 shows an embodiment of a circuit for detecting the above-mentioned no-signal detection pulse, centering on a signal discrimination circuit. When the start circuit 1 is activated as described above to cancel recording, the recording state is canceled by driving the rewind command circuit 2, and the rewind operation is subsequently performed. During the rewinding period at the time of recording cancellation, the autopsy head 5 picks up the signal output from the magnetic tape and supplies this pick-up output to the amplifier 6. Note that VRl provided at the input stage of the amplifier 6 is a volume for adjusting the level of the input signal from the detection head 5. The signal output from the magnetic tape input to the amplifier 6 via the detection head 5 is
After being saturated and amplified by , it is rectified by diode D,
It is held in capacitor C. One end of this capacitor C is connected to a non-inverting input terminal of an operational amplifier 10 constituting a comparator. Further, the inverting input terminal H of the operational amplifier 10 is connected to R2, VR from the power supply Vcc.
A reference voltage is applied via R2 and R3, and the setting of the reference voltage can be varied by adjusting the volume VR2. As described above, the charging voltage is held in the capacitor C, but when the signal on the magnetic tape reaches the part where no signal is recorded, the pickup output from the detection head 5 decreases rapidly, and the voltage is held in the capacitor C. The voltage is discharged with a discharge time constant C'XRl. Then, when this voltage drops below the voltage INV of the inverting input terminal H of the operational amplifier 10, the output of the comparator is inverted, and this inverted output is taken out from the comparator output terminal T as a no-signal detection pulse, and is The signal is supplied to the gate circuit 3. Therefore, the reversal timing of the comparator output is determined by the discharge time constant CXRl, and it is possible to quickly and reliably locate a portion of the magnetic tape where no signal is recorded. It is possible to quickly set the state for subsequent recording/pause.
Although the above description has been made with reference to purely electronic type tape running control, it can also be easily applied to a mechanical type by slightly modifying the circuit configuration of the electromagnetic plunger drive mechanism, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention, and FIG. 2 is an example of the configuration of a detection circuit for detecting no signal. 1: Start circuit, 2: Rewind command circuit, 3: Gate circuit, 4: Memory circuit, 5: Detection head, 6: Amplifier, 7:
Signal discrimination circuit, 8: Rewind release circuit, 9: Recording/pause command circuit.

Claims (1)

[Claims] 1. In a magnetic recording/reproducing device equipped with a recording canceller, a rewind command means obtains a start signal based on a recording cancel operation, cancels the recording state based on the start signal, and switches tape running to a rewind state; a no-signal detection means for detecting a no-signal portion on the tape; a storage means for storing that the operating state before the recording cancel operation was a recording state; and an output of the start signal and the no-signal detection means. means for obtaining a rewind reset pulse by taking the AND of the output of the storage means; a rewind release means for stopping the rewind operation by the reset pulse; and a drive for the rewind release means. and recording/pause command means for switching to a recording/pause state accordingly, canceling the recording state based on a recording cancel operation and rewinding the magnetic tape to a recording start position on the tape;
Furthermore, by detecting an unrecorded portion of the signal on the tape during this rewinding period, the rewinding is canceled, and then the recording/pause state is automatically set. A magnetic recording/reproducing device characterized in that: