JPS6025807B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device, and an object thereof is to quickly reproduce signals recorded on a magnetic tape.

A variety of magnetic recording and reproducing devices have been developed and provided in the past, but among them, dictation recording and reproducing devices must quickly and rationally reproduce recorded information and perform processing such as typing. Since then, many improvements have been made.

However, even with such a dictation recording and reproducing device, when various pieces of information are recorded on a magnetic tape at relatively long intervals, the blank portions are not skipped during playback, which impedes rapid information processing. It was something to do. Therefore, the present invention solves these conventional drawbacks,
An embodiment thereof will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a play switch of the normal type, and when the switch 1 is turned on instantaneously, the flip-flop circuit FF is activated. is inverted, transistor T becomes conductive, relay 5 is operated, and the device enters the regeneration operation state. Reference numeral 2 denotes a normally open type fast-forward switch. When the switch 2 is turned on instantaneously, the flip-flop circuit FF2 performs an inverting operation, the transistor L becomes conductive, the relay 6 operates, and the device starts a fast-forward operation.

Reference numeral 3 denotes a rewind switch. When the switch 3 is turned on instantaneously, the flip-flop circuit FF3 performs an inverting operation, the transistor T3 becomes conductive, the relay 7 operates, and the device performs a rewind operation.

Here, the relays 5 to 7 are used to switch between recording and reproduction, control the rotational speed and direction of the motor, and the like. In addition, flip-flop paths FF, ~FF3 are switches 1~3.
When a set input is performed by turning on the output terminals, the levels of the output terminals Q and Q are inverted from L level and H level to H level and L level, respectively. Next, reference numeral 4 denotes a stop switch, and when the switch 4 is turned on momentarily, all of the flip-flop circuits FF, -FF3 are reset, and all operations of the device are stopped. Next, N, ~ Cape is a 3-input or 2-input NAND gate circuit, and a 3-input NAND gate circuit N, and a 2-input NAND gate N6 are interposed between the output terminal Q of the flip-flop circuit FF and the base of the transistor T, The 3-input NAND gate circuit N2 is interposed between the output terminal Q of the flip-flop circuit FF2 and the -base of the transistor T2, and the 2-input NAND gate circuit N3 is interposed between the output terminal Q of the flip-flop circuit FF3 and the base of the transistor T3. ing. Both of the two input NAND gate circuits N4 and N5 are used as inverters with their two input terminals connected and connected, and the NAND gate circuit N4 is similar to the NAND gate circuit N2 described above.
The NAND gate circuit N5 is interposed between the output terminal of the NAND gate circuit N3 and one input terminal of the NAND gate circuit N2.
, N, and one input terminal of the terminals.

Next, 8 is a detection circuit that detects whether a signal is recorded on the magnetic tape 9, and in this detection circuit 8, n
Kawama playback head, 11 is a playback amplifier, 12 is a rectifier circuit consisting of rectifier diodes D, D2 and smoothing capacitor C, L to T6 are switching transistors, R
, are resistors, and C2 is a capacitor. Reference numeral 13 denotes a switch for manually selecting between a normal playback operation and a playback operation in which a blank portion is automatically skipped in fast forward and played, and is interposed between the collector of the transistor T5 and one input terminal of the NAND gate circuit N2. has been done.

Reference numeral 14 denotes a monostable multipipulator circuit, the trigger input of which is connected to the collector of the transistor, and the output terminal of which is connected to one input terminal of the NAND gate circuit N3.

The operation of the above embodiment will now be explained.

Now, when the playback switch 1 is instantaneously turned on to start the playback operation, if no signal is received from the playback head 10' or the tape 9 for a predetermined period of time, the transistor T4 is in a non-conducting state, so the capacitor C2 is charged. When the voltage has progressed by a predetermined amount, the transistor T5 becomes conductive. Then, the output of the NAND gate N2 is inverted from the low potential (L level) to the high potential (H level), so the transistor T2 becomes conductive, the relay 6 operates, and the device starts a fast forward operation. At this time, the head 10 is in contact with the tape 9 and performs a fast-forward operation of the tape while reproducing the signal, so-called cue operation. When the head 10 detects a signal on the tape in this state, this signal is amplified by the amplifier 10, rectified by the rectifier circuit 12, and turns on the transistor T4.
5 becomes non-conductive. When this transistor T5 detects a signal that changes from a conductive state to a non-conductive state, the monostable multipipulator 14 operates and generates an L level output at its output terminal. By this L level output, the NAND gate circuit N
The output of T3 is at the H level for a certain period of time when the monostable multipipulator 14 is in an operating state, and during this period, the transistor T3 is turned on, the relay 7 is operated, and a rewinding operation is performed. When this rewinding operation is completed, the output of the NAND gate circuit N3 returns to the L level, and the output of the NAND gate circuit N again changes from the L level to the H level, and the relay 5 is activated to restart the reproducing operation. Note that when the head 10 immediately detects the signal on the tape 9 when the above-mentioned reproduction operation is started, the transistor T5 remains in a non-conducting state.
The playback operation continues as is.

However, when the signal on the tape 9 disappears in this reproduction operation state, the fast-forward operation is automatically performed as described above. In the above embodiment, if the switch 13 is left open, normal playback operation will be performed.

As explained above, according to the magnetic recording and reproducing apparatus of the present invention, only the portion of the magnetic tape where signals are recorded can be selected and automatically reproduced by fast-forwarding, so it is particularly suitable for dictation recording and reproducing apparatuses. If used, when typing while playing recorded information, wasted time is eliminated and processing time can be shortened. Moreover, in the device of the present invention, the magnetic tape is rewound for a certain period of time in the process of transitioning from fast-forwarding to playback, so that when playback starts, the information recording section is always played back from the beginning without interruption. , it is possible to eliminate information leakage, thereby shortening the processing time and adding accuracy.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. 1...Playback switch, 2...Fast forward switch, 3.
．． ．． Rewind switch, 4...Stop switch, 5-7.
...Relay, 8...Detection circuit, 9...Magnetic tape,
10... Playback head, 11... Playback amplifier, 12.
... Rectifier circuit, FF, ~FF3... flip-flop circuit, T, ~T6... transistor, N, ~N6... NAND gate circuit.

Claims (1)

[Claims] 1. A detection circuit is provided to detect whether a signal is recorded on the magnetic tape while the magnetic tape is running, and when a signal detection output is output from the detection circuit during playback operation, the playback operation is continued and the detection circuit outputs a signal from the detection circuit. When the signal detection output is not output, the magnetic tape is automatically fast-forwarded until the detection output is output, and during this fast-forward operation, when the signal detection output is output from the detection circuit, the magnetic tape is rewound for a predetermined period of time, and the magnetic tape is played back again. 1. A magnetic recording/reproducing device characterized in that the magnetic recording/reproducing device is configured to be automatically transferred to.