JPH0612588B2 - Recording / playback circuit of tape recorder - Google Patents

Description

The present invention relates to a recording / reproducing circuit of a tape recorder, and more particularly to a recording / reproducing circuit suitable for a tape recorder used in place of a memo.

(B) Conventional technology Tape recorders that are used in place of memos and are used in combination with typewriters have become popular. This is very inconvenient because it is necessary to repeat the operation of replaying later. As a technique for improving such a point, there is a technique in which a signal reproduced from a magnetic tape is stored in a memory circuit as a digital signal and the signal stored in the memory circuit is repeatedly reproduced. As such a technique, For example, there is one disclosed in JP-A-59-19202. Tape recorders are often used to record the contents of meetings and lectures, but the length of the magnetic tape is often insufficient when performing such recording operations. Sometimes the magnetic tape runs even though the signal is inside. As a technique for improving such a point, there is a technique in which an electric motor is rotationally driven to drive a magnetic tape only when there is a recording signal obtained from a microphone. As such a technique, for example, Japanese Utility Model Publication No. 56-433. Have been disclosed in.

(C) Problems to be Solved by the Invention According to the technique of Japanese Utility Model Publication No. 56-433, the wasteful running of the magnetic tape can be eliminated and the magnetic tape can be effectively used. There's a problem.
That is, in such a recording operation, since the contents of the conference or the lecture are all recorded on the magnetic tape, it is necessary to reproduce the signal recorded on the magnetic tape only for the time required for the recording. And, an important part of such a recorded signal is generally very small, and such a part is often recorded during a conference or a lecture. Reproducing all the signals recorded in this way is wasteful in time. Further, the memory circuit described in Japanese Patent Laid-Open No. 59-19202 is wasteful because it is used only during the reproducing operation. The present invention is intended to provide a recording / reproducing circuit that improves such a point.

(D) Means for Solving the Problems The recording / reproducing circuit of the present invention stores a recording signal obtained from a microphone during a recording operation in a memory circuit used for repeat reproduction during a reproducing operation for a predetermined time. The read signal is recorded on a magnetic tape.

(E) Operation The present invention is to perform an efficient recording operation by using the memory circuit used for repeat reproduction during the reproducing operation during the recording operation.

(F) Embodiment The illustrated circuit is an embodiment of the recording / reproducing circuit of the present invention. In the figure, (1), (2), (3), (4) and (5) are recording / playback selector switches, respectively, playback side terminals (1p), (2p), (3p),
(4p), (5p), recording side terminals (1r), (2r), (3r), (4r), (5r) and common terminals (1c), (2c), (3c), (4c), ( 5c), is provided.
Reference numeral (6) is a microphone for converting an acoustic signal into an electric signal, and its output terminal is connected to the recording side terminal (1r) of the recording / playback changeover switch (1). (7) is a recording / playback magnetic head that operates as a playback head during playback operation and also acts as a recording head during recording operation by the switching operation of the recording / playback selection switch, and its first terminal is the recording / playback selection switch (1). The playback side terminal (1p) and the common terminal (2c) are connected to the recording side terminal (2r) of the recording / playback selector switch (2) that is grounded, and the second terminal is the playback of the recording / playback selector switch (2). It is connected to the side terminal (2p). (8) is a preamplifier circuit to which the reproduced signal reproduced by the magnetic head (7) is input during the reproducing operation and the recording signal obtained from the microphone (6) is input during the recording operation, and (9) is A variable resistor that applies the signal amplified by the preamplifier circuit (8) and adjusts the level of the signal, and (10) receives the signal whose level is adjusted by the variable resistor (9). Together with a main amplifier circuit for amplifying the signal, (11) is a speaker to which the signal amplified by the main amplifier circuit (10) is applied and which emits the signal,
One end of the signal terminal is connected to the output terminal of the main amplifier circuit (10), and the other end is connected to the common terminal (4c) of the recording / playback selector switch (4) whose playback side terminal (4p) is grounded. There is. (1
2) and (13) are selection switches for selecting normal recording operation and memory recording operation, which are connected to the common terminals (12c) (13c) and the common terminals (12c) (13c) during normal recording operation. The first terminal (12a) (13a) and the common terminal (12c) during memory recording operation
The second terminal (12b) (13b) connected to (13c) is provided.
Reference numeral (14) is a recording amplifier circuit which receives the signal amplified by the preamplifier circuit (8) and amplifies the signal, the output terminal (12c) of which is the second of the magnetic head (7). It is connected to the first terminal (12a) which is connected to the terminal. (1
5) and (16) are repeat and pause switches that control repeat operation and pause operation, and common terminal (15c)
(16c), the first terminals (15a) and (16a) connected to the common terminals (15c) and (16c) when in the inoperative state, and the common terminals (15c) and (16c) when in the repeat or pause state It is provided with the 2nd terminal (15b) (16b) connected with. (17) is a battery which is a power source, (18) is an electric motor for running and driving a magnetic tape, (19)
Is a power switch that is closed when an operation such as recording or playback is performed, and is the first terminal (1
9a) and the first terminal (16a) are connected to the common terminal (16c) of the repeat and pause switch (16) connected to the electric motor (18), and the second terminal of the selection switch (13) ( 13b)
And a second terminal (19b) connected to. Reference numeral (20) is a first voice conversion circuit for receiving the signal amplified by the preamplification circuit (8) and converting the signal into a digital signal, and an output terminal (2) for outputting the digital signal.
1) is equipped. (22) is a memory circuit for receiving the signal converted into the digital signal by the first voice conversion circuit (20) and storing the signal for a predetermined time, and an output terminal of the first voice conversion circuit (20) It has a write terminal (23) and a read terminal (24) connected to (21). (twenty five)
Is a second audio conversion circuit which receives the digital signal read from the read terminal (24) of the memory circuit (22) and converts the digital signal into an analog signal, and the output terminal (26) of the analog signal is The reproducing side terminal (3p) is connected to the common terminal (3c) of the recording / reproducing changeover switch (3) connected to the second terminal (15b) of the repeat / pause switch (15). (27) is a memory recording switch that is closed when the memory recording operation is performed and is opened when the memory recording operation is canceled. (28) is a recording / playback selector switch (5) and a selection switch (1
3), corresponding to the switching of the repeat / pause switch (16) and the memory recording switch (27), the first audio conversion circuit (20), the memory circuit (22) and the second audio conversion circuit (25) A control circuit for controlling the operation of the control switch (30), the operation of which is controlled by the control circuit (28) and the opening and closing operation of a control switch (30) inserted and connected in the power supply path to the electric motor (18). Is a motor control circuit for controlling the memory recording operation.When the memory recording operation is performed by switching the selection switch (13) and the recording / playback selector switch (5), the control switch (30) is opened and the memory recording operation switch (27 ) Has the function of closing the control switch (30). (31) is a signal control switch that is normally closed and is opened by the action of the control circuit (28) when it is switched to the state of performing the repeat reproduction operation, and the output terminal of the preamplification circuit (8). First terminal (31a) selected for
And a second terminal (31b) connected to the signal application terminal of the variable resistor (9) and the common terminal (15c) of the repeat / temporary stop switch (15). Further, the recording side terminal (3r) of the recording / playback changeover switch (3) to which the output signal of the second audio conversion circuit (25) is applied to the common terminal (3c) is the selection switch (1
It is connected to the second terminal (12b) of 2). In such a circuit configuration, the time stored by the memory circuit (22) is set to about 8 seconds when using a 256 Kbit RAM, for example. Then, the storage operation by the memory circuit (22) is controlled by the control circuit (28), but the signals input to the write terminal (23) are successively stored in the memory circuit (22) and are stored for a predetermined time. That is, after 8 seconds, the signals are successively output to the read terminal (24), and when the state is switched to the repeat operation, the write operation to the memory circuit (22) is stopped and the read operation is repeated. . The recording / reproducing circuit of the present invention is configured as described above. Next, the operation of such a circuit will be described.

The illustrated state is a stopped state, and when a reproducing operation is performed in such a state, the drive mechanism of the magnetic tape is brought into a reproducing state and the power switch (19) is closed. When the power switch (19) is closed, power is supplied to the electric motor (18) through the repeat and pause switch (16) and the control switch (30) to perform a driving operation for reproducing the magnetic tape. At the same time, the power supply operation to each circuit is performed to configure the reproduction operation state. The reproduction signal reproduced by the recording / reproducing magnetic head (7) is input to the preamplifier circuit (8) through the recording / reproducing changeover switch (1) and amplified. The reproduced signal amplified by the preamplifier circuit (8) is passed through a signal control switch (31) to a variable resistor.
It is applied to (9) to adjust its level. The signal whose level is adjusted by the variable resistor (9) is supplied to the main amplifier circuit (1
It is input to 0), amplified, and then applied to the speaker 11 and emitted. By such an operation, the user can hear the signal reproduced from the magnetic tape. Further, when in the reproduction operation state, the first audio conversion circuit (20), the memory circuit (22) and the second audio conversion circuit (25) are in the operation state by the operation of the control circuit (28), The conversion circuit (20) performs an analog signal conversion into a digital signal, the memory circuit (22) performs a storage operation, and the second audio conversion circuit (25) performs a digital signal conversion into an analog signal. That is, in such a state, the reproduction signal amplified by the preamplification circuit (8) is input to the first audio conversion circuit (20), converted into a digital signal, and then output to the output terminal (21). The digital signal output to the output terminal (21) is input to the write terminal (23) provided in the memory circuit (22) and stored in the memory circuit (22). The signal stored in the memory circuit (22) is output to the read terminal (24) after a predetermined time, that is, 8 seconds. The digital signal output to the read terminal (24) is input to the second audio conversion circuit (25), converted into an analog signal which is the original signal, and output to the output terminal (26). Then, in such a state, the writing operation to the memory circuit (22) and the reading operation from the memory circuit (22) are performed. In the reproducing operation state, the recording amplifying circuit (14) is in the inoperative state.

The reproducing operation is performed as described above. Next, the repeat operation will be described. Such a repeat operation is a repeat / pause switch (15) when in the playback operation state described above.
This is performed by switching (16) to the opposite side of the illustrated state. When the repeat and pause switch (16) is switched to the opposite side to the state shown in the figure, power supply to the electric motor (18) is cut off and a switching signal is input to the control circuit (28), and the control circuit ( In 28), the control operation for the repeat operation is performed. When the control circuit (28) is in the state of controlling the repeat operation, the signal control switch (31) is opened and the write operation of the memory circuit (22) is stopped, and the memory circuit (22) repeats the read operation. It will be in a state to do. That is, the read terminal (2) of the memory circuit (22)
In 4), the signal stored in the memory circuit (22) for 8 seconds is repeatedly read. The memory circuit
The signal read from (22) is converted into an analog signal by the second audio conversion circuit (25) and output to the output terminal (26). Such a signal is the recording / reproduction changeover switch (3) and repeat / temporary. It is input to the main amplifier circuit (10) through the stop switch (15) and the variable resistor (9). Therefore, when the repeat operation is performed, the signal stored in the memory circuit (22) is repeatedly emitted by the speaker (11), and the user repeatedly listens to the same signal. Can be done. When such a repeat operation is being performed, the electric motor (18) is in a state where the rotation is stopped, the magnetic tape is in a stopped state, and the tape recorder is in a temporarily stopped state. When the repeat / pause switch (16) is switched to the illustrated state in such a repeat reproduction operation state, the running of the magnetic tape (14) and the control circuit
The function of (28) restores the normal playback operation.

The playback operation and repeat operation are performed as described above,
Next, the recording operation will be described. First, select switch (1
2) A normal recording operation in the state shown in (13) will be described. Recording operation of the magnetic tape when the drive mechanism of the magnetic tape that performs the recording operation in the state shown in the figure enters the recording operation and the power switch (19) is closed to supply power to the electric motor (18). Drive operation is performed. Also, when a recording operation is performed, the recording / playback selector switches (1), (2), (3), (4) and (5) are switched to the recording side, which is the opposite side of the state shown in the figure, and each circuit operates for recording. It becomes a state to do. Microphone when in such recording operation state
The recording signal converted into the electric signal by (6) is input to the preamplifier circuit (8) through the recording / reproducing changeover switch (1) and amplified. The recording signal amplified by the preamplifier circuit (8) is input to the recording amplifier circuit (14) and amplified, and then applied to the recording / playback magnetic head (7) through the selection switch (12). As a result, a recording signal obtained from the microphone (6) by the recording operation of the magnetic head (7) is recorded on the magnetic tape running and driven by the electric motor (18). Although the recording operation is performed in this way, the recording signal is emitted from the speaker (11) because the signal path of the speaker (11) is blocked by the recording / playback changeover switch (4) when in the recording operation state. And howling can be suppressed.

The normal recording operation is performed as described above. Next, the memory recording operation using the memory circuit (22) will be described. In such memory recording operation, first select switch (12)
This is done by switching (13) to the opposite side of the state shown and performing a normal recording operation. When such a switching operation and a recording operation are performed, the control circuit (28) is in a state of controlling the memory recording operation, and the motor control circuit (29)
The control switch (30) is opened by the action of. Also,
By the function of the control circuit (28), the first voice conversion circuit (2
0), the memory circuit (22) and the second audio conversion circuit (25) are in an operating state, the first audio conversion circuit (20) converts an analog signal into a digital signal, and the memory circuit (22) stores an operation. Also, the conversion operation of the digital signal into the analog signal is performed by the second voice conversion circuit (25). In such a state, the recording signal obtained from the microphone (6) is input to the preamplifier circuit (8) and is amplified by the first signal.
Input to the voice conversion circuit (20).

The recording signal which is an analog signal input to the first audio circuit (20) is converted into a digital signal and output to the output terminal (21). The digital signal output to the output terminal (21) is the write terminal (23) provided in the memory circuit (22).
And is stored in the memory circuit (22). The signal stored in the memory circuit (22) is output to the read terminal (24) after a predetermined time, that is, 8 seconds. The digital signal output to the read terminal (24) is input to the second audio conversion circuit (25), converted into an analog signal which is the original signal, and output to the output terminal (26). The recording signal output to the output terminal (26) is the recording / playback selector switch (3) and the selection switch.
The recording signal is applied to the recording / playback magnetic head (7) through (12), and the recording signal is applied to the magnetic head (7) with a delay of 8 seconds from the time of being input to the microphone (6). Become. Then, in such a state, the control switch (30) is opened, the power supply to the electric motor (18) is cut off, and the traveling drive of the magnetic tape is not performed, so the magnetic head (7)
The recording operation of the magnetic tape is not performed by.
In such a state, if there is a message to be recorded during the conference, the memory recording switch (27) may be closed. When the memory recording switch (27) is closed, the control switch (30) is closed by the operation of the electric motor control circuit (29) by the control operation of the control circuit (28). When the control switch (30) is closed, power is supplied to the electric motor (18), and the magnetic tape is driven to run by the rotation of the electric motor (18). Therefore, the output terminal of the second audio conversion circuit (25). The signal output to (26) and applied to the magnetic head (7) is the magnetic head.
Recorded on magnetic tape by (7). The recording signal recorded on the magnetic tape when the memory recording switch (27) is closed is not the signal input to the microphone (1) when the recording switch (27) is closed, but 8 Since the signal is input a few seconds ago, the statement that the user heard just before closing the memory recording switch (27) and wanted to make a note is recorded on the magnetic tape. In this way, the signal delayed by the memory circuit (22) is recorded on the magnetic tape by the magnetic head (7), but when the content of the utterance is not necessary to record, the memory recording switch is opened. Just do it. When the memory recording switch (27) is opened, the control switch (30) is opened by the operation of the electric motor control circuit (29) by the control operation of the control circuit (28). When the control switch (30) is opened, the electric motor (1
Since the power supply to 8) is cut off, the magnetic tape stops running and the tape recorder enters the recording standby state. The opening operation of the memory recording switch (27) is performed after about 8 seconds have passed since there is no signal to be recorded on the magnetic tape. Further, while in the recording standby state, the running of the magnetic tape is stopped, but the first audio conversion circuit (20), the memory circuit (22) and the second audio conversion circuit (2
Since 5) is in the state of performing the conversion operation and the storage operation by the control operation of the control circuit (28) respectively, if the closing operation and the opening operation of the memory recording switch (27) are repeated, it will be performed in a conference or a lecture. With, you can select only the necessary information and record it on a magnetic tape.

As described above, the normal recording operation and the memory recording operation using the memory circuit (22) are performed, but the repeat and pause switch (15) (1
When 6) is switched, the power supply to the electric motor (18) is cut off and the tape recorder can be temporarily stopped.

In the present embodiment, the memory operation time by the memory circuit 22 is set to 8 seconds, but the memory operation time can be lengthened by increasing the capacity of the memory used in the memory circuit 22.

(G) Effect of the Invention The recording / reproducing circuit of the present invention converts a recording signal obtained from the microphone into a digital signal and stores the digital signal in the memory circuit for a predetermined time, and after a predetermined time, the signal read from the memory circuit into an analog signal. Since it was converted and recorded on the magnetic tape, that is, the signal obtained from the microphone was delayed for a predetermined time and recorded on the magnetic tape, so listen before recording the signal recorded on the magnetic tape. Can be done. Therefore, only the necessary information can be selected and recorded on the magnetic tape, and the present invention has an advantage that the magnetic tape can be effectively used. Further, the present invention is characterized in that it is possible to suppress an increase in manufacturing cost because the memory recording operation is performed by utilizing the memory circuit used for the repeat reproduction during the reproducing operation.

[Brief description of drawings]

The circuit shown is an embodiment of the recording / reproducing circuit of the present invention. Description of main drawing numbers (6) …… Microphone, (7) …… Recording / playback magnetic head, (8) …… Preamplifier circuit, (10) Main amplifier circuit, (12) (13)
...... Selection switch, (14) …… Amplification circuit for recording, (15) (16)
...... Repeat and pause switch, (18) …… Electric motor,
(19) …… Power switch, (20) …… First voice conversion circuit, (2
2) ... Memory circuit, (25) ... Second voice conversion circuit, (27)
...... Memory recording switch, (28) ...... Control circuit, (29)
...... Motor control circuit, (30) …… Control switch, (31) ……
Signal control switch.

Claims (1)

[Claims] 1. A tape recorder equipped with a memory circuit for storing a reproduced signal reproduced by a magnetic head during a reproducing operation as a digital signal and repeatedly outputting the reproduced signal stored by a repeat operation. A recording / reproducing circuit of a tape recorder, wherein the obtained recording signal is stored in the memory circuit for a predetermined time and the signal read from the memory circuit is recorded on a magnetic tape.