JPH0414652A - Operation control circuit for tape recorder - Google Patents

Abstract

PURPOSE:To reproduce and listen to all pieces of recording information by rewinding a magnetic tape and stopping the operation when the tape recorder is in a stopping mode from the reproduction state so as to regenerate a recording signal for the delay time of a processing circuit at a succeeding recording opportunity. CONSTITUTION:When a stopping operation switch 18 is depressed and closed in the reproduction state, an output signal at a reproduction output terminal 21 is inverted and a signal is applied to a rewinding output terminal 25 for a prescribed time. Consequently, the reproduction of the tape recorder is released and the rewinding is started and the tape recorder comes to a stop after the lapse of a prescribed time. The time when the signal is outputted at the terminal 25 is selected by taking a time required for the switching of a driving mechanism whose reproduction is released and a tape rewinding time into account. Since the mode switching is implemented in such a manner, even when the regenerative signal is delayed by the signal processing of a digital signal processing circuit 5, the continuation of the information having been listened to when the stopping operation is set can be listened to by the succeeding reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an operation control circuit for a tape recorder equipped with a digital signal processing circuit for digitally processing signals reproduced by a magnetic head.

(b) Prior Art Cassette-type tape recorders that use a cassette tape in which an air supply tape is housed in a container called a cassette have become widespread. Such a cassette-type tape recorder can be miniaturized and has excellent operability, so it is generally used as a means for recording the contents of meetings and the like in place of memos. In addition, some recent tape recorders set the running speed of the magnetic tape faster than the running speed during the recording operation, that is, the specified speed, so that the frequency of the playback signal does not become high even if the playback operation is performed. Some devices incorporate a digital signal processing circuit that performs digital processing, or performs digital processing to remove noise components in the reproduced signal and clarify the reproduced signal.

(8) Problems to be Solved by the Invention The digital processing operation of the reproduced signal described above is performed by a microcomputer called a digital signal processing circuit. It takes seconds. Therefore, in a tape recorder incorporating such a digital signal processing circuit, when a stop operation is performed from the playback state, the magnetic tape stops running, but at the stopped position, the signal that was being played back and listened to at the time of the stop operation is recorded. The position will be 0.3 to 0.5 seconds after the magnetic tape has broken. Therefore, if a playback operation is performed after performing such a stop operation, the playback operation will be started from the signal recorded at the aforementioned position, that is, the position where the vehicle traveled for 0.3 to 0.5 seconds.
The signal recorded on the portion of the magnetic tape that ran for 3 to 0.5 seconds is no longer reproduced. The present invention aims to provide an operation control circuit that is improved in this respect.

(d) Means for Solving the Problems The operation control circuit of the present invention converts an analog signal applied to an input terminal into a digital signal, performs digital processing, and converts the digitally processed signal into an analog signal for output. In a tape recorder equipped with a digital signal processing circuit in which the signal output to the terminal is delayed from when it is input to the input terminal, when a stop operation is performed from the playback operation state, the magnetic tape is rewound a little and then stopped. It was designed to be.

(*) Effect The present invention is capable of rewinding the magnetic tape when a stop operation is performed from the playback state, thereby rewinding the signal recorded on the portion of the magnetic tape that ran during the delay time of the digital signal processing circuit. The next playback operation state is generated.

(f) Embodiment The illustrated circuit is an embodiment of the operation control circuit of the present invention. In the figure, (1) is a magnetic head that reproduces the signal recorded on the magnetic tape, and (2) is a preamplifier that receives the signal reproduced by the magnetic head (1) and amplifies the signal. circuit, (3) is a switch circuit (
4), which has a common terminal (3a), a first terminal (3b), and a second terminal (3) connected to the output terminal of the preamplifier circuit (2).
c). In such a configuration, when an H (high) level signal is applied to the switching control terminal (4a) provided in the switch circuit (4), the changeover switch (3) is placed on the opposite side of the illustrated state. It is configured to switch to (5) has an input terminal (6) to which the reproduced signal, which is an analog signal amplified by the preamplifier circuit (2), is input through the changeover switch (3), and the analog signal after digital processing is input. It is a digital signal processing circuit having an output terminal (7) that can be used to determine the output, and an A/D conversion circuit (8) that converts an analog signal into a digital signal. A signal processing circuit (9) that receives a signal and performs a signal processing operation on the signal.
, a D/A conversion circuit (10) that converts the digital signal processed by the signal processing circuit (9) into an analog signal and outputs it to the output terminal (7), and the signal processing circuit (
9) and a signal processing control circuit (11) that controls operations such as the following. In such a circuit configuration, when an H level signal is applied to the control terminal (lla) provided in the signal processing control circuit (11), the digital signal processing circuit (5) performs a signal processing operation. Furthermore, the signal input to the input terminal (6) is configured to be output to the output terminal (7) after a predetermined delay of, for example, 0.5 seconds. (12) is the preamplifier circuit (2
) is applied via the changeover switch (3) or through the digital signal processing circuit (5), and a variable resistor (13) adjusts the level of the signal; ) is input with a playback signal whose level has been adjusted and amplifies the signal, and a speaker (14) is connected as a load. (15), (16), (1
7) and (18> are the playback operation switch, fast forward operation switch, rewind operation switch, and stop operation switch that are pressed and closed during playback, fast forward, rewind, and stop operations, respectively; (19) is the above-mentioned operation switch; Each operation switch (15),
(16) A control circuit that controls each operation of the tape recorder based on the signals inputted by closing of (17) and (18>; (20) is a reproduction circuit provided in the control circuit (19); a reproduction switching circuit (2) which puts the tape recorder into an open operation state in which an H-level drive signal is output to the output terminal (21) and puts the tape recorder into a playback operation state;
2) is a fast-forward switching circuit that puts the tape recorder into a fast-forward operating state when the fast-forward output terminal (23) provided in the control circuit (19) enters an open operating state in which an H-level drive signal is fully output. , (24) is a rewinding output terminal (25) provided in the control circuit (19).
) is a rewinding switching circuit which puts the tape recorder into a rewinding operation state when the tape recorder enters an open operation state in which an H-level drive signal is fully output. Reference numeral (26) is a selection switch for selecting operation/non-operation of the digital signal processing circuit (5), and is configured to be opened when performing a digital signal processing operation. (27) is the control circuit (
19) and the selection switch (2
6) is a control signal output terminal from which an H level signal is output when in the closed state, and is provided in the switching control terminal (4a) of the switch circuit (4) and the signal processing control circuit (11). It is connected to the control terminal (lla). In such a circuit configuration, when the digital signal processing circuit (5) is in the state of performing signal processing operation by closing the selection switch (26), if a stop operation is performed from the regeneration operation state, the output of the regeneration output terminal (21) is changed. When the signal is inverted from the H level to the L (lower) level, the rewinding output terminal (25) is output for a predetermined time, that is, at least 0.5 during the playback operation.
The present invention is constructed such that an H level signal is output for the time required to rewind a portion of the magnetic tape that has run for seconds.The operation of such a circuit will now be described.

When the selection switch (26) is in an open state, that is, in a state in which no processing operation is performed by the digital signal processing circuit (5), when the reproduction operation switch (15) is pressed and opened, the control circuit (19) is An H level drive signal is output to the playback output terminal (21). When an H-level drive signal is output to the playback output terminal (21), the playback switching circuit (20) is activated to put the tape recorder into the playback operation state. When such a reproduction operation is performed, the output signal of the control signal output terminal (27) provided in the control circuit (19) is at the L level, so the changeover switch (3) is in the state shown in the figure, and the digital signal processing is performed. Circuit (5) is inactive. The reproduction signal reproduced by the magnetic head (1) is input to the preamplifier circuit (2), amplified, and then passed through the changeover switch (3).
) is applied to the variable resistor (12>).The reproduced signal applied to the variable resistor (12) is input to the main amplifier circuit (13) after its level is adjusted.The main amplifier circuit The playback signal input to (13) is amplified and then applied to the speaker (14) to emit sound, so that the user can hear the playback sound.When in such a playback operation state, When the stop operation switch (18) is pressed and closed, the output signal of the playback output terminal (21) is inverted from the H level to the L level, and the playback switching circuit (20) becomes inactive, so the tape recorder is disabled. The normal playback operation is performed in this way, but when the fast forward operation switch (16) and the rewind operation switch (17) are pressed and closed, the control circuit (19)
An H-level drive signal is output to the fast-forward output terminal (23) and the rewind output terminal (25) provided in the , and the fast-forward switching circuit (22) and the rewinding switching circuit (24) operate. This causes the tape recorder to enter the fast forward and rewind operating states. In addition, when the stop operation switch (18) is pressed and closed when the tape recorder is in the fast forward operation state or the rewind operation state, the fast forward output terminal (23) and the rewind output terminal (
25) goes to L level, and the fast-forward switching circuit (22) and the rewinding switching circuit (24) become inoperable, so that the tape recorder is returned to the stopped state.

The normal operation is performed as described above, but next, the operation when the selection switch (26) is closed, that is, when the digital signal processing circuit (5) is in a state where the processing operation is performed, will be described. When the regeneration operation switch (15) is pressed and closed in such a state, an H level is output to the regeneration output terminal (21) and the control signal output terminal (27) provided in the control circuit (19>). A signal is output.When an H level signal is output to the reproduction output terminal (21), the reproduction switching circuit (20) becomes operational;
The tape recorder enters the playback mode as described above. Further, when an H level signal is output to the control signal output terminal (27), the switch circuit (4) performs a switching operation of the changeover switch (3), and the changeover switch (3)
is switched to the opposite side of the illustrated state, and the digital signal processing circuit (5) enters a state in which it performs a signal processing operation. The reproduced signal reproduced by the magnetic head (1) is input to the preamplifier circuit (2), amplified, and then passed through the changeover switch (3) to the digital signal processing circuit (5).
The signal is applied to the input terminal (6) provided at the terminal. The reproduced signal applied to the input terminal (6) is converted into a digital signal by an A/D conversion circuit (8) and then input to a signal processing circuit (9) where it is processed. The digital signal processed by the signal processing circuit (9) is
After being converted into an analog signal by the D/A conversion circuit (10), it is output as a reproduced signal to the output terminal (7), but the signal output to the output terminal (7) is not applied to the input terminal (6). The output will be delayed by 0.5 seconds from the time it was output.

The reproduced signal outputted to the output terminal (7) is applied to a variable resistor (12), its level is adjusted, and then inputted to the main amplifier circuit (13). The main amplifier circuit (13)
The playback signal input to the speaker is amplified and then sent to the speaker (1
4) and the sound is emitted. Since the reproduced signal processed by the digital signal processing circuit (5) is emitted from the speaker (14), the user can listen to the reproduced signal with suppressed noise components, for example. As described above, the regeneration operation is performed when the selection switch (26) is in the closed state.Next, the operation when performing the stop operation while in the regeneration operation state will be explained. When the user presses and closes the stop operation switch (18) during the regeneration operation state, the output signal of the regeneration output terminal (21) changes from the H level to the L level.
At the same time, a signal at H level is outputted to the rewinding output terminal (25) for a predetermined period of time.

As a result, the tape recorder is brought into a rewinding state after the playback operation is canceled, and rewinding of the magnetic tape is started. Then, after a predetermined period of time has elapsed, the output signal of the rewind output terminal (25) becomes L level, and the tape recorder is stopped. The time during which the H level signal is output to the rewinding output terminal <25) is:
The rewind length of the magnetic tape is set by taking into account the time required for switching the drive mechanism such as reversing the electric motor after the playback state is released, and the time for actually rewinding the magnetic tape. It is set to be longer than the length of the magnetic tape that ran for at least 0.5 seconds during the reproduction operation. If the stop operation is performed while in the playback mode, the magnetic tape is rewound and then switched to the stop mode, so the delay operation of the playback signal is delayed by the signal processing operation of the digital signal processing circuit (5). Even if the stop operation is performed, the continuation of the information that was being heard when the stop operation was performed can be heard by the next playback operation.

(g) Effects of the Invention According to the present invention, when a stop operation is performed from a playback operation state, the magnetic tape is rewinded and then switched to the stop state, so that the playback operation is performed during the delay time of the digital signal processing circuit. The signal recorded on the part of the magnetic tape that has been recorded can be generated into the next playback operation state, and even if the playback operation is performed while repeatedly performing stop and playback operations, all of the information recorded on the magnetic tape can be reproduced. The present invention has the effect that it can be played back and listened to.

[Brief explanation of drawings]

The illustrated circuit is one embodiment of the operation control circuit of the present invention. Explanation of main drawing numbers (1)...Magnetic head, (2)...Preamplifier circuit, (3)...Selector switch, (4)...Switch circuit, (Preliminary)... Digital signal processing circuit, (8)・
...A/D modification circuit, (9)...signal processing circuit,
(10)...D/A conversion circuit, (19)...Control circuit, (20)...Reproduction switching circuit, (22)...
...Switching circuit for fast forwarding, (24)...Switching circuit for rewinding, (26>...Selection switch.

Claims (1)

[Claims] (1) An input terminal to which a signal reproduced by a magnetic head is applied, and an analog signal inputted through the input terminal is converted into a digital signal and then digitally processed, and the digitally processed signal is converted into an analog signal. In a tape recorder equipped with a digital signal processing circuit that outputs a signal to an output terminal and delays the signal output to the output terminal from when it is input to the input terminal, at least when a stop operation is performed from a playback operating state. An operation control circuit for a tape recorder, characterized in that the tape recorder is brought to a halt state after rewinding the portion of the magnetic tape running during the time delayed by the digital signal processing circuit.