JPH11288539A - Reproducing circuit for tape recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate the manual rewinding operation of a tape when the reproduction is turned back to the normal state from the repeat state. SOLUTION: By a memory circuit 14, digital reproducing signals converted by an analog-to-digital converting circuit 13 are successively stored and held for the specified time. The digital reproducing signals stored in the memory circuit are repeatedly read out by a digital-to-analog converting circuit 15 and outputted as the reproduced signals. The write-in and read-out against the memory circuit are controlled by a control circuit 23 to changeover the normal playing operation and the repeat playing operation. Also by the control circuit, when a duplicate reproduction switch 26 is in the closed state, a tape running control circuit 2 is controlled so that the reproduction is executed after the tape is rewound at the time of recovery to the normal play from the repeat play.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing circuit for a tape recorder, and more particularly, to a reproducing circuit for a tape recorder which digitizes a reproduced signal and stores the digitized signal in a memory, and repeatedly reproduces the reproduced signal stored in the memory.

[0002]

2. Description of the Related Art When attempting to write text recorded on a magnetic tape, it is often necessary to repeatedly reproduce part of the information recorded on the tape due to the difference between the reproduction speed and the writing speed. In such a case, if the operation of rewinding the tape by manual operation and performing reproduction again is performed, the operation is extremely troublesome and inefficient.

Therefore, conventionally, while reproducing a magnetic tape, a reproduced signal is converted from analog to digital and stored in a memory circuit. When repeated reproduction is necessary, the signal stored in the memory circuit is repeatedly read. To play. It should be noted that the time that can be repeatedly reproduced by the conventional tape recorder reproduction circuit is a fixed time of about ten seconds or less, depending on the capacity of the memory circuit.

[0004] Such a reproducing circuit for a tape recorder is described, for example, in Japanese Patent Application Laid-Open No. Hei 3-66068.

[0005]

In a conventional reproducing circuit for a tape recorder of this type, a signal stored in a memory circuit is repeatedly read out and reproduced, so that the same portion can be reproduced many times without rewinding the tape. , It is possible to easily perform operations such as writing the recorded contents into sentences.

However, in the conventional reproducing circuit for a tape recorder, when the information is repeatedly reproduced only for a certain time before the repeated reproduction start time, and when the transition from the repeated reproduction to the normal recording and reproduction is performed, the tape is immediately reproduced. In order to restart the playback of the tape, the connection between the information that was repeatedly played back and the information that restarted the tape playback is often interrupted.When listening to continuous conversations, etc., the tape must be manually operated again. Rewind. There is a problem that it is necessary to restart normal reproduction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tape recorder reproducing circuit which does not require manual tape rewinding when returning from repeated reproduction to normal reproduction.

[0008]

According to the present invention, a signal recorded on a magnetic tape is reproduced, a reproduced signal is stored in a memory circuit, and a reproduced signal stored in the memory circuit is repeatedly read out to a speaker. In a reproducing circuit for a tape recorder provided with a repeat reproducing function to be supplied, when returning from a repeat reproducing operation to a normal reproducing operation, the normal reproducing operation is started after rewinding the magnetic tape by a preset length. It is characterized by the following.

Here, when returning from the repeat reproduction operation to the normal reproduction operation, the magnetic tape is rewound by a predetermined length, and then the normal reproduction operation is started. A switch may be provided to switch between a mode for starting the normal reproduction operation without returning.

Further, the present invention provides a magnetic head for reproducing a signal recorded on a magnetic tape, a preamplifier circuit for amplifying a reproduction signal reproduced by the magnetic head, and a preamplifier circuit amplified by the preamplifier circuit. An analog-to-digital conversion circuit for converting the reproduced signal into a digital signal; a memory circuit for storing the digital signal converted by the analog-to-digital conversion circuit; and a digital circuit for converting the digital signal stored in the memory circuit to an analog signal. An analog conversion circuit, a reproduction signal switching circuit for switching a reproduction signal amplified by the preamplifier circuit and an output signal from the digital-to-analog conversion circuit in accordance with an operation mode and applying the signal to a main amplification circuit; A main amplifier circuit for amplifying the reproduction signal from the reproduction signal switching circuit, and A speaker for sound, a control circuit and, repeat play mode for the control circuit for controlling writing and reading operations of the signal to the memory circuit,
Switch means for instructing the control of the repeat reproduction start mode and the overlap reproduction mode, a tape traveling control circuit for controlling the tape traveling by a control signal from the control circuit, and an operation in response to a control signal from the tape traveling control circuit A readout signal from the magnetic head is stored in the memory circuit, and a repeat playback operation is performed by repeatedly playing back the stored signal of the memory circuit. When returning, it is possible to select between the mode of playing back the continuation of the signal content that had been played back immediately before and the mode of playing back part of the signal content that had been played back immediately before. And

Specifically, the switch means includes a repeat reproduction switch, a repeat reproduction start switch for instructing the control circuit to control a repeat reproduction mode, a repeat reproduction start mode, and an overlap reproduction mode, respectively.
And an overlap reproduction switch.

Further, the present invention provides a method of reproducing a signal recorded on a magnetic tape, storing a reproduced signal in a memory circuit, repeatedly reading the reproduced signal stored in the memory circuit, and supplying the read signal to a speaker. In the reproducing method for a tape recorder having a function, when returning from the repeat reproducing operation to the normal reproducing operation, the normal reproducing operation is started after rewinding the magnetic tape by a preset length. Features.

Also in this case, when returning from the repeat reproduction operation to the normal reproduction operation, the magnetic tape is rewound by a predetermined length, and then the normal reproduction operation is started. The mode in which the normal reproduction operation is started may be switched without rewinding.

Still further, according to the present invention, a signal recorded on a magnetic tape is reproduced, a reproduced signal is stored in a memory circuit, and a reproduced signal stored in the memory circuit is repeatedly read and supplied to a speaker. In a recording information medium used in a reproducing circuit for a tape recorder having a reproducing function, when returning from a repeat reproducing operation to a normal reproducing operation, the magnetic tape is rewound by a preset length and then a normal reproducing operation is performed. Means for starting the recording is recorded.

[0015]

[Function] When the information recorded on the tape is played back by repeating the start / return of the repeat operation sequentially by operating the repeat playback switch, the tape is automatically rewound every time the operation returns from the repeat operation. Thus, by returning to the normal reproduction operation, a part behind the repeat reproduction range which was performed immediately before is reproduced in an overlapping manner. As a result, even if the range of the repeat playback ends in the middle of the conversation, continuous conversation can be heard without rewinding the tape by manual operation.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The reproducing circuit for a tape recorder shown in FIG. 1 reproduces an audio signal recorded on a magnetic tape, a magnetic head 11 for outputting a reproduced signal, amplifies a reproduced signal from the magnetic head 11, and outputs an amplified reproduced signal. A preamplifier circuit 12, an analog / digital conversion circuit 13 for converting an amplified reproduction signal from the preamplifier circuit 12 from analog to digital and outputting a digital reproduction signal, and an analog / digital conversion circuit 13
Circuit 14 for storing a digital reproduction signal from the memory for a predetermined time, a digital / analog conversion circuit 15 for digital-to-analog conversion of the digital reproduction signal read from the memory circuit 14 and outputting a reproduction signal for repeat reproduction, a preamplifier A reproduction signal switching circuit 16 for selectively outputting either the reproduction signal from the circuit 12 or the reproduction signal for repeat reproduction from the digital / analog conversion circuit 15; and amplifying the reproduction signal output from the reproduction signal switching circuit 16. A main amplifier circuit 17, a speaker 18 that converts the reproduced signal amplified by the main amplifier circuit 17 into sound and emits a sound, an electric motor 19 for running the tape, a tape running control circuit 20 for controlling the electric motor 19, and supplying power to each unit. A power supply circuit 21 for supplying power, a power switch for closing in response to operations such as reproduction and rewind, and an A control circuit 23 that controls the digital-to-digital conversion circuit 13, the digital-to-analog conversion circuit 15, the reproduction signal switching circuit 16, and the tape running control circuit 20, and instructs the control circuit 23 to operate / non-operate the repeat reproduction function. And a repeat start switch 25 for instructing the control circuit to start repeat reproduction / return to normal reproduction when the repeat reproduction function is operating, and to set a predetermined amount of tape when returning from repeat reproduction to normal reproduction. It has an overlap playback switch 26 for determining whether or not to rewind only (whether to perform overlap playback) and a playback switch (not shown), a rewind switch, a fast-forward switch, a recording switch, and the like.

The reproduction signal switching circuit 16 has a control terminal 16d
When the L (low) level signal is applied to the input terminal 16a, the reproduction signal from the preamplifier circuit 12 input to the input terminal 16a is output to the output terminal 16c. Also, the control terminal 16d
When an H (high) level signal is applied to the input terminal 16b, a reproduced signal from the digital / analog conversion circuit 15 input to the input terminal 16b is output to the output terminal 16c. The control circuit 23 supplies an H level signal to the control terminal 16d of the reproduction signal switching circuit 16 only when the repeat reproduction switch 24 is in the closed state and the repeat start switch 25 is in the closed state. An L level signal is supplied.

The tape running control circuit 20 includes a control circuit 23
, The motor 19 is controlled at a speed and a direction corresponding to each of the reproduction mode, the rewind mode, the fast-forward mode, and the stop mode in accordance with the operation of a switch (not shown). Then, when the overlap reproduction switch 26 is in the closed state, after shifting from the stop mode to the rewind mode,
Change to normal playback mode.

The reproduction signal stored in the memory circuit 14 is stored for a time corresponding to the storage capacity of the memory. For example, when a 256-Kbyte RAM (random access memory) is used, the time is about 8 seconds. Writing to the memory circuit 14 is performed by a repeat reproduction switch 24.
Is performed under the control of the control circuit 23 in the closed state. At this time, the analog / digital conversion circuit 13
Are sequentially written to the memory circuit 14, and the data exceeding the storage capacity is sequentially overwritten on the oldest recording. Thus, the digital reproduction signal is stored for a time corresponding to the capacity of the memory. Thereafter, when the repeat start switch 25 is closed, the writing to the memory circuit 14 is stopped, and the reading operation is started. After that, when the repeat start switch 25 is opened, the contents stored in the memory circuit 14 are invalidated, and thereafter, the digital reproduction signal input from the analog / digital conversion circuit 13 is stored again.

Next, the operation of the reproducing circuit for a tape recorder shown in FIG. 1 will be described with reference to FIGS.

First, it is assumed that each switch is in the state shown in FIG. This state is a stop state.

Next, when a reproduction switch (not shown) is pressed, the power switch 22 is closed, and the control circuit 23 detects the depression of the reproduction switch and gives an instruction to the tape running control circuit 200. The motor 19 is driven in the reproduction mode (step S201). Thereby, the magnetic head 11 starts reproducing the signal recorded on the magnetic tape. A reproduction signal reproduced by the magnetic head 11 is amplified by the amplifier circuit 12 and then supplied to an analog / digital conversion circuit 13 and a reproduction signal switching circuit 16.

Next, the control circuit 23 detects the state of the repeat reproduction switch 24 and determines whether or not to perform repeat reproduction (step S202). As shown in FIG.
When the repeat reproduction switch 24 is in the open state, it is determined that repeat reproduction is not to be performed, and the control circuit 23 outputs an L-level switching control signal to the reproduction signal switching circuit (that is, maintains the same state as the initial state). ). As a result, the reproduced signal input from the preamplifier circuit 12 to the reproduced signal switching circuit 16 is supplied to the main amplifier circuit 17, amplified, and output to the speaker 18. Thereby, the user can listen to the sound reproduced by the speaker.

On the other hand, when the repeat reproduction switch 24 is in the closed state (when changed), the control circuit 23
Detecting this, the analog / digital conversion circuit 13
Then, by controlling the memory circuit 14, analog-to-digital conversion of the reproduction signal and storage of the digital reproduction signal are performed (step S203). Also in this case, the reproduction signal input from the amplification circuit 12 to the reproduction signal switching circuit 16 is supplied to the speaker via the main amplification circuit 17.

When the repeat start switch 25 changes to the closed state while the repeat reproduction switch 24 is closed (step S204), the controller 23 first causes the tape running control circuit 20 to stop the electric motor 19. (To pause) Further, the control circuit 23 outputs an H level switching control signal to the reproduction signal switching circuit 16 so that the digital / analog conversion circuit 15
Is supplied to the main amplifier circuit. Further, the control circuit 23 includes the analog / digital conversion circuit 1
3 is stopped, writing to the memory circuit 14 is stopped (step S205), and the digital / analog conversion circuit 15 is operated to start a read operation from the memory circuit 14 (step S206).

FIG. 3 (a) shows signals recorded on the magnetic tape (T). (T0) → (T1) → (T
It is assumed that the magnetic head 11 reproduces data in the order of 2). When the repeat start switch 25 is closed when the magnetic head 11 reaches (T1), the memory circuit 14 stores information for a predetermined time before that point (the storage capacity of the memory circuit 14). (For example, 8 seconds)
(A0), (B0), (C0),..., (J0)
Are stored. In this case, as shown in FIG. 3B, (A0), (B0), (C0),.
Is repeatedly read from the memory circuit 14. Then, the digital signal read from the memory circuit 14 is transmitted to the digital / analog conversion circuit 1.
At 5, the digital-to-analog conversion is performed, and the digital-to-analog converted signal is supplied to the main amplifier 17 via the reproduction signal switching circuit 16. The main amplifying circuit 17 amplifies the input reproduction signal and outputs it to the speaker 18. Thus, the signal stored in the memory circuit 14 is repeatedly reproduced, and is emitted from the speaker 18. Thus, the user can repeatedly listen to the same sound.

Next, when the repeat start switch 25 is opened, the control device 23 detects that (step S207) and checks the state of the duplication reproduction switch 26 (step S208). In the state shown in FIG. 1, the overlap reproduction switch is in the open state. In this case, the tape drive control circuit 20 is controlled to drive the electric motor 19 to shift to the tape reproduction state. At the same time, an L level switching control signal is output to the reproduction signal switching circuit 16, and the reproduction signal from the preamplifier 12 is output to the main amplification circuit 17. In addition, the signal reading from the memory circuit 14 is stopped, and the digital / analog conversion circuit 15 is stopped. Further, the contents stored in the memory circuit 14 are invalidated (erased), and a new digital reproduction signal from the analog / digital conversion circuit 13 is recorded. At this time, since the magnetic head 11 is at the position (T1) of the magnetic tape (T) in FIG. 3A, the reproduced signals are (A1), (B1), (C1),. , Are played back in this order.

On the other hand, the control device 23 executes step S208.
When the closed state of the duplication reproduction switch 26 is detected, the tape drive control circuit 20 is controlled to drive the electric motor 19, and after the tape is rewound by a preset length (step S209), Move to the tape playback state. For example, after performing control to return the magnetic head 11 from (T1) to (T1-t) in FIG. As a result, as shown in FIG. 3C, reproduction by the magnetic head is performed by using (I0), (J0),
Reproduction is performed in the order of (A1),. That is, (I
With respect to (0) and (J0), the reproduction is performed in duplicate with the repeat reproduction.

FIG. 3 (c) shows a signal reproduced when the repeat start switch 25 is again closed at (T2) in FIG. 3 (a). Further, in this state, if only the overlap reproduction switch 26 is opened, the repeat reproduction operation is continued. Further, in this state, when the repeat start switch 25 is opened, signal reproduction by the magnetic head is restarted from (T2) of the magnetic tape (T), so that (I1), (J1),
Signal reproduction is performed in the order of (A2),.

Finally, when a reproduction switch (not shown) is turned off (step S210), the power switch 22 is opened and stopped.

As described above, in the present embodiment, when the operation returns from the repeat operation to the reproduction operation, a part of the information reproduced by the repeat operation can be reproduced in duplicate.

In the above embodiment, the amount of information reproduced in the repeat reproduction is described as depending on the storage capacity of the memory circuit. However, the amount of information reproduced by changing the sampling frequency, the number of quantization bits, or the like can be changed. Needless to say.

The amount of rewinding of the magnetic tape in the case of performing the overlapping reproduction is changed by changing a set value of a timer (a timer for setting a rewind time) of the tape running control circuit 20. Can be.

[0035]

According to the present invention, when the repeat operation is released, the magnetic tape can be automatically rewound by a predetermined length and reproduced, so that a part of the rear portion of the repeat reproduction range can be reproduced. It can be duplicated and played.
Therefore, when a long-time conversation is reproduced to form a sentence or the like, it is not necessary to rewind by a manual operation and perform a reproduction operation every time the repeat reproduction is repeated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the control circuit of FIG. 1;

3A and 3B are diagrams for explaining the operation of the tape recorder reproduction circuit of FIG. 1, wherein FIG. 3A shows a signal recorded on a magnetic tape, and FIG. 3B shows repeat reproduction at T1. A diagram showing a signal that is repeatedly played back when started,
(C) is a diagram showing a signal to be repeatedly reproduced when the repeat reproduction is started at T2.

[Description of Signs] 11 Magnetic head 12 Preamplifier circuit 13 Analog / Digital converter circuit 14 Memory circuit 15 Digital / Analog converter circuit 16 Reproduction signal switching circuit 17 Main amplifier circuit 18 Speaker 19 Electric motor 20 Tape running control circuit 21 Power supply circuit 22 Power switch 23 Control circuit 24 Repeat playback switch 25 Repeat start switch 26 Duplicate playback switch

Claims (7)

[Claims] 1. A signal recorded on a magnetic tape is reproduced, and the reproduced signal is stored in a memory circuit.
In a playback circuit for a tape recorder having a repeat playback function for repeatedly reading out a playback signal stored in a memory circuit and supplying the playback signal to a speaker, when returning from a repeat playback operation to a normal playback operation, the length is set to a predetermined length. A reproducing circuit for a tape recorder, wherein a normal reproducing operation is started after rewinding a magnetic tape. 2. An overlapping reproduction mode in which, when returning from a repeat reproduction operation to a normal reproduction operation, the magnetic tape is rewound by a preset length and then a normal reproduction operation is started, and the magnetic tape is rewound. 2. The reproduction circuit for a tape recorder according to claim 1, further comprising a switch for switching between a mode for starting a normal reproduction operation without the need for the mode. 3. A magnetic head for reproducing a signal recorded on a magnetic tape, a preamplifier circuit for amplifying a reproduction signal reproduced by the magnetic head, and a reproduction signal amplified by the preamplification circuit. An analog-to-digital conversion circuit for converting a digital signal into a digital signal, a memory circuit for storing the digital signal converted by the analog-to-digital conversion circuit, and a digital-to-analog conversion circuit for converting the digital signal stored in the memory circuit to an analog signal A reproduction signal switching circuit for switching a reproduction signal amplified by the preamplifier circuit and an output signal from the digital-to-analog conversion circuit in accordance with an operation mode and applying the switching signal to a main amplification circuit; A main amplifier circuit for amplifying the reproduction signal from the main amplifier, and a speaker for emitting sound in accordance with the output signal of the main amplifier circuit A control circuit for controlling writing and reading operations of signals to and from the memory circuit;
Switch means for instructing the control circuit to control a repeat playback mode, a repeat playback start mode, and an overlap playback mode; a tape travel control circuit for controlling tape travel by a control signal from the control circuit; Having an electric motor that operates according to a control signal from a control circuit,
When a read signal from the magnetic head is stored in the memory circuit, a repeat read operation is performed by repeatedly playing back the stored signal in the memory circuit, and when returning to the read mode of the read signal of the magnetic head again, A playback mode for a tape recorder characterized by being able to select between a mode for playing back the continuation of the signal content that had been repeatedly played back up to and a mode for playing back a portion of the signal content that had been played back repeatedly just before. circuit. 4. The switching means includes a repeat reproduction switch, a repeat reproduction start switch, and an overlap reproduction switch for instructing the control circuit to control a repeat reproduction mode, a repeat reproduction start mode, and an overlap reproduction mode, respectively. 4. The reproduction circuit for a tape recorder according to claim 3, wherein: 5. A signal recorded on a magnetic tape is reproduced, and the reproduced signal is stored in a memory circuit.
In a playback method for a tape recorder having a repeat playback function of repeatedly reading a playback signal stored in a memory circuit and supplying the playback signal to a speaker, when returning from a repeat playback operation to a normal playback operation, the length is set to a predetermined length. A reproducing method for a tape recorder, wherein a normal reproducing operation is started after rewinding a magnetic tape. 6. An overlapping reproduction mode in which, when returning from the repeat reproduction operation to the normal reproduction operation, the magnetic tape is rewound by a preset length and then the normal reproduction operation is started, and the magnetic tape is rewound. 6. The reproducing method for a tape recorder according to claim 5, wherein a mode for starting a normal reproduction operation can be switched without any operation. 7. A signal recorded on a magnetic tape is reproduced, and the reproduced signal is stored in a memory circuit.
In a recording information medium used for a tape recorder playback circuit having a repeat playback function for repeatedly reading a playback signal stored in a memory circuit and supplying the playback signal to a speaker, when returning from a repeat playback operation to a normal playback operation, An information recording medium recorded with means for rewinding the magnetic tape by a set length and then starting a normal reproduction operation.