JP2620647B2 - Operation display circuit of tape recorder - Google Patents

Description

The present invention relates to an operation display circuit of a tape recorder provided with a digital signal processing circuit for digitally processing a signal reproduced by a magnetic head.

(B) Conventional technology A cassette type tape recorder using a cassette tape in which a magnetic tape is stored in a container called a cassette has been widely used. Such a cassette type tape recorder can be reduced in size and has excellent operability, so that it is generally used as a means for recording the contents of a meeting or the like instead of a memo. Also, some recent tape recorders include a magnetic tape that runs faster than a specified speed, that is, the speed of the read signal so that the frequency of the read signal does not increase even if the read operation is performed. Some digital signal processing circuits incorporate a digital signal processing circuit for performing digital processing or performing digital processing in order to remove a noise component in a reproduced signal to clarify the reproduced signal. Then, tape recorders configured to perform the operation switching of the tape recorder by using the suction force of the plunger instead of the pressing force on the operation button have become widespread. Since it is not possible to confirm with the operation buttons whether the operating state is such, a light emitting element is generally provided which is lit to indicate that it is in an operating state such as reproduction.

(C) 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, and the digital processing operation takes, for example, 0.3 to 0.5 seconds. . Therefore, in a tape recorder in which such a digital signal processing circuit is incorporated, when a stop operation is performed from a playback operation state, the magnetic tape stops running. The position will be 0.3 to 0.5 seconds after the position of the recorded magnetic tape. Therefore, if the reproduction operation is performed after the stop operation is performed, the reproduction operation is started from the signal recorded at the above-described position, that is, the position where the vehicle travels for 0.3 to 0.5 seconds, and the magnetic field travels for 0.3 to 0.5 seconds. The reproduction operation is started from the signal recorded on the tape portion, and the reproduction operation of the signal recorded on the magnetic tape portion that has traveled for 0.3 to 0.5 seconds is not performed. An object of the present invention is to provide an operation display circuit in which this point is improved.

(D) Means for Solving the Problems The operation display circuit of the present invention converts an analog signal applied to an input terminal into a digital signal and then performs digital processing, and converts the digitally processed signal into an analog signal and outputs the analog signal. In a tape recorder having a digital signal processing circuit that delays a signal output to a terminal when the signal is input to the input terminal and a light emitting element that lights up in a rewind operation state, a stop operation is performed from a reproduction operation state. When the rewinding operation is performed, the light emitting element is turned off when the rewinding operation is being performed.

(E) Function The present invention provides a signal recorded on a portion of a magnetic tape that travels during a delay time of a digital signal processing circuit by performing a rewinding operation of a magnetic tape when a stop operation is performed from a reproducing operation state. And a light emitting element provided to indicate that the apparatus is in the rewinding operation state when such rewinding operation is performed, in a non-lighting state. Thus, the lighting operation in which the lighting time is short is prevented.

(F) Embodiment The illustrated circuit is an embodiment of the operation display circuit of the present invention. In the figure, (1) is a magnetic head for reproducing a signal recorded on a magnetic tape, and (2) is a preamplifier for receiving a signal reproduced by the magnetic head (1) and amplifying the signal. A circuit (3) is a changeover switch whose switching operation is performed by the switch circuit (4). The common terminal (3a) and the first terminal (3b) connected to the output terminal of the preamplifier circuit (2). And the second terminal (3c)
It has. In such a configuration, when the H (high) level signal is applied to the switch control terminal (4a) provided in the switch circuit (4), the switch (3) is turned on the opposite side of the state shown in the figure. Is switched. (5) has an input terminal (6) through which the reproduced signal, which is an analog signal amplified by the preamplifier circuit (2), is input through the changeover switch (3); A digital signal processing circuit having an output terminal (7) for outputting a signal, the signal processing operation being performed when an H level signal is applied to a control terminal (8), and a digital signal processing circuit being input to an input terminal (6). The signal is configured to be output to the output terminal (7) with a delay of a predetermined time, for example, 0.5 seconds. (9) a variable resistor for adjusting the level of the reproduced signal amplified by the preamplifier circuit (2) through the changeover switch (3) or through the digital signal processing circuit (5), , (10) are main amplifier circuits to which a reproduced signal whose level is adjusted by the variable resistor (9) is inputted and which amplifies the signal.
The speaker (11) is connected as a load. (1
2), (13), (14), and (15) are operation switches for reproduction, operation for fast-forward, operation for rewind, and operation for stop which are pressed and closed at the time of reproduction, fast-forward, rewind, and stop operations, respectively. An operation switch (16) is an operation control circuit for controlling each operation of the tape recorder based on a signal inputted by closing each of the operation switches (12), (13), (14) and (15); 17) A reproduction switch for setting the tape recorder to a reproduction operation state while the operation state is set while the H-level drive signal is output to the reproduction output terminal (18) provided in the operation control circuit (16). Circuit, (1
Reference numeral 9) denotes a light emitting diode for reproduction display whose anode is connected to the reproduction output terminal (18) via a resistor (20) and whose cathode is grounded. It is configured to light when a level signal is being output. (21) is an operation state while the H-level drive signal is being output to the output terminal (22) for fast-forward provided in the operation control circuit (16), and at the same time the tape recorder is set to the fast-forward operation state. A fast-forwarding display light-emitting diode having an anode connected to the fast-forward output terminal (22) via a resistor (24) and a cathode grounded, and the fast-forward output terminal (23). It is configured to turn on when an H-level signal is output to (22). (2
5) The winding which is in the operating state while the H-level drive signal is being output to the rewinding output terminal (26) provided in the operation control circuit (16), and which sets the tape recorder to the rewinding operation state. The rewinding switching circuit (27) is a rewinding display light emitting diode whose anode is connected to the rewinding output terminal (26) via a resistor (28) and whose cathode is grounded. Output terminal for return (26)
Is turned on when an H-level signal is output. (29) a selection switch for selecting the operation or non-operation of the digital signal processing circuit (5);
It is configured to be closed when performing a digital signal processing operation. A control signal output terminal (30) is provided in the operation control circuit (16) and outputs an H level signal when the selection switch (29) is in a closed state. ) And the control terminal (8) of the digital signal processing circuit (5). In such a circuit configuration, when the digital signal processing circuit (5) is in a state of performing a signal processing operation by closing the selection switch (29) and a stop operation is performed from the reproduction operation state, the output of the reproduction output terminal (18) The signal is inverted to the L (lower) level from the H level, and is a predetermined time, that is, the time required to rewind the portion of the magnetic tape that has traveled for at least 0.5 seconds during the reproducing operation, to the rewind output terminal (26). Is output. (31) is a display operation control signal output terminal provided in the operation control circuit (16), and when a stop operation is performed from the reproduction operation state, an H level signal is supplied to the rewind output terminal (26). Is output such that an H level signal is output for the same time as the time when the is output. (32) is a control transistor whose collector is connected to the anode of the light-emitting diode (27) for rewind display and whose emitter is grounded, and whose base is connected to the display operation control signal via a resistor (33). Connected to output terminal (31). The present invention is configured as described above, and the operation will be described below.

When the reproduction operation switch (12) is pressed and closed when the selection switch (29) is open, that is, in a state where the processing operation by the digital signal processing circuit (5) is not performed, the operation control circuit (16) is provided. The H level drive signal is output to the reproducing output terminal (18). When an H-level drive signal is output to the reproduction output terminal (18), the reproduction switching circuit (17) is activated to put the tape recorder into the reproduction operation state. When such a reproducing operation is performed, the output signal of the control signal output terminal (30) provided in the operation control circuit (16) is at the L level, so that the changeover switch (3) is in the state shown in FIG. The processing circuit (5) is inactive. The reproduced signal reproduced by the magnetic head (1) is inputted to the preamplifier circuit (2), amplified and applied to the variable resistor (9) through the changeover switch (3). The level of the reproduced signal applied to the variable resistor (9) is adjusted and then input to the main amplifier (10). The main amplifier circuit (1
The reproduced signal input to (0) is amplified and then applied to the speaker (11) and emitted, so that the user can hear the reproduced sound. The reproducing operation is performed in this manner. When in the reproducing operation state, the reproduction display light emitting diode (19) is turned on to indicate that the tape recorder is in the reproducing operation state. When the stop operation switch (15) is pressed and closed in such a reproduction operation state, the output signal of the reproduction output terminal (18) is inverted from H level to L level. As a result, the reproduction switching circuit (17) becomes inactive, the tape recorder is returned to the stop state, and the reproduction display light emitting diode (19) is turned off. The normal reproduction operation is performed in this manner, but when the fast-forward operation switch (13) or the rewind operation switch (14) is pressed and closed, the fast-forward output terminal ( 22) Or the H-level drive signal is output to the rewind output terminal (26), and the fast-forward switching circuit (21) or the rewind switching circuit (25) is operated, and the tape recorder is operated in the fast-forward operation state or Let it be in the rewinding operation state. Then, when in the fast-forward operation state or the rewind operation state, the light-emitting diode (23) for fast-forward display or the light-emitting diode (27) for rewind display lights up, indicating that the tape recorder is in each operation state. When the stop operation switch (15) is pressed and closed when the tape recorder is in the fast forward operation state or the rewind operation state, the output signal of the fast forward output terminal (22) or the rewind output terminal (26) is output. Is inverted from H level to L level. As a result, the fast-forward switching circuit (21) or the rewind switching circuit (25) becomes inactive, the tape recorder is returned to the stop state, and the fast-forward display light emitting diode (23) or the rewind display light emission is performed. The diode (27) is turned off.

As described above, the normal operation is performed. Next, the operation when the selection switch (29) is closed, that is, when the processing operation by the digital signal processing circuit (5) is performed will be described. In this state, when the reproduction operation switch (12) is pressed and closed, the reproduction output terminal (18) and the control signal output terminal (30) provided in the operation control circuit (16) become H level. Is output. When an H-level signal is output to the reproduction output terminal (18), the reproduction switching circuit (17) is activated, causing the tape recorder to be in the reproduction operation state, and the reproduction display light emitting diode (19) is turned on. Then, it indicates that the tape recorder is in the reproducing operation state. When an H-level signal is output to the control signal output terminal (30), the switching operation of the changeover switch (3) is performed by the switch circuit (4), and the changeover switch (3) operates in a state opposite to the state shown in the figure. Side and the digital signal processing circuit (5) enters a state of performing a signal processing operation. A reproduction signal reproduced by the magnetic head (1) is input to a preamplifier circuit (2), amplified, and then passed through a changeover switch (3) to an input terminal (6) provided in a digital signal processing circuit (5). ). The reproduction progress applied to the input terminal (6) is output to an output terminal (7) after a predetermined signal processing operation is performed by a digital signal processing circuit (5). The output signal is output 0.5 second later than when it is applied to the input terminal (6). The reproduction signal output to the output terminal (7) is applied to a variable resistor (9), the level of which is adjusted, and then input to a main amplifier (10). The reproduced signal input to the main amplifier circuit (10) is amplified and applied to a speaker (11) to emit sound. Since the reproduced signal subjected to the signal processing by the digital signal processing circuit (5) is emitted from the speaker (11), the user can listen to the reproduced signal in which the noise component is suppressed, for example. . The reproduction operation when the selection switch (29) is in the closed state is performed as described above. Next, the operation when the stop operation is performed in the reproduction operation state will be described. When the user presses and closes the stop operation switch (15) in such a reproducing operation state, the output signal of the reproducing output terminal (18) is inverted from the H level to the L level and the rewind output signal is output. An H level signal is output to the terminal (26) and the display operation control signal output terminal (31) for a predetermined time. As a result, the tape recorder is brought into the rewind operation state after the reproduction operation state is released, and the rewind operation of the magnetic tape is started. Then, when a predetermined time elapses, the output signals of the rewind output terminal (26) and the display operation control signal output terminal (31) become L level, and the tape recorder is stopped. The time during which an H level signal is output to the rewind output terminal (26) and the display operation control signal output terminal (31), and the time required to switch the drive mechanism such as the reverse rotation operation of the electric motor after the reproduction operation is released. And the time when the magnetic tape is actually rewound is set in consideration of the rewound length of the magnetic tape. I have. When the stop operation is performed in the reproducing operation state as described above, the magnetic tape is rewound and then switched to the stopped state. Therefore, the digital signal processing circuit (5) performs a signal processing operation to delay the reproduction signal. Even if it is performed, the continuation of the information that was being heard when the stop operation was performed can be heard by the next reproduction operation. When the rewind operation is being performed, the H-level signal is output to the rewind output terminal (26), but the H-level signal output to the display operation control signal output terminal (31) is in the state. The control transistor (32) is turned on by the signal (2), so that the light-emitting diode (27) for rewind display is turned off.
Therefore, when the rewind operation is performed in such a short time, the light-emitting diode (27) for rewind display does not light up and does not give a user a sense of discomfort.

In this embodiment, each switching circuit (17), (21), (25)
Each light emitting diode (1
Although the lighting operations of 9), (23), and (27) are controlled, it is also possible to provide a separate display terminal and control the display operation independently. In this case, It is not necessary to provide a display operation control signal output terminal (31) and a control transistor (32).

(G) Effect of the Invention In the present invention, when the stop operation is performed from the reproduction operation state, the magnetic tape is rewound, and then the state is switched to the stop state. The signal recorded on the magnetic tape part can be reproduced at the next reproduction operation, and even if the reproduction operation is performed while repeating the stop operation and the reproduction operation, all the information recorded on the magnetic tape is You can listen to the playback. Further, at the time of the rewind operation performed along with the stop operation, the light-emitting element provided for indicating that the rewind operation is in operation is turned off to thereby prevent the light-emitting operation having a short lighting time from being performed. Thus, the present invention has an effect that the user does not feel uncomfortable.

[Brief description of the drawings]

The illustrated circuit is an embodiment of the operation display circuit of the present invention. Description of main figure numbers (1) ... magnetic head, (5) ... digital signal processing circuit, (16) ... operation control circuit, (17) ... reproduction switching circuit, (19) light emission for reproduction display Diode, (21) Fast forward switching circuit, (23) Fast forward cover light emitting diode, (2
5) Rewinding switching circuit, (27) ... Rewind display light emitting diode, (29) ... Selection switch, (32) ... Control transistor.

Claims (1)

(57) [Claims] An input terminal to which a signal reproduced by a magnetic head is applied, an analog signal input 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 the operation display circuit of a tape recorder having a digital signal processing circuit for outputting a signal to an output terminal and delaying a signal output to the output terminal from the time when the signal is input to the input terminal, the operation display circuit is pressed and closed at the time of reproduction operation. A regenerating operation switch, a rewinding operation switch that is pressed and closed at the time of rewinding operation, a stop operation switch that is pressed and closed at the time of stopping operation, and the regenerating operation switch and the rewinding operation switch. When the button is pressed and closed, a drive signal for putting the tape recorder in the playback operation state and the rewind operation state is output and the winding is performed. A signal for turning on the light emitting element indicating that it is in the rewinding state when in the operating state, and the drive signal and the signal for turning on the light emitting element when the stop operation switch is pressed and closed. An operation control circuit for stopping the output operation, wherein when the stop operation is performed from the reproduction operation state, the drive signal for stopping the output operation of the drive signal for the reproduction operation and performing the rewinding is at least the digital signal processing. The time required to rewind the portion of the magnetic tape running during the time delayed by the circuit is output, and the light emitting element is not turned on while the rewind operation is being performed. An operation display circuit for a tape recorder.