JPH0644328B2 - Recording circuit of tape recorder - Google Patents

Description

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

(B) Conventional technology Tape recorders, which are used as a substitute for memos and used in combination with typewriters, are widespread, but with such tape recorders, when it is difficult or difficult to hear, the magnetic tape is rewound. It is very inconvenient because it is necessary to repeat the operation of reproducing after playback. 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 magnetic tape is often insufficient when performing such recording operations.
The cause is that the magnetic tape runs even though there is no recorded audio signal. As a technique for improving such a point, there is a technique in which an electric motor is rotationally driven to run a magnetic tape only when there is a recording signal obtained from a microphone, and such a technique is disclosed in, for example, Japanese Utility Model Publication No. 56-433. Some have been disclosed. Further, a tape recorder used in place of a memo is generally constructed so that it can be switched from a reproducing operation state to a recording operation state directly, that is, without performing a stop operation.

(C) Problems to be Solved by the Invention According to the technique disclosed in Japanese Utility Model Publication No. 56-433, the wasteful running of the magnetic tape is certainly eliminated.
Although the magnetic tape can be used effectively, it has the following problems. That is, in such a recording operation, the entire contents of the conference or the lecture are recorded on the magnetic tape, and therefore, when the signal recorded on the magnetic tape is reproduced and listened, it is necessary to reproduce only the time required for the recording operation. And, the important part of the signal thus recorded is generally very small, and such a part is often recorded during a meeting or lecture. Therefore, reproducing all the signals recorded on the magnetic tape is time-consuming. The present invention intends to provide a recording circuit that improves such a point.

(D) Means for Solving Problems The recording circuit of the present invention is a recording / playback changeover switch that is switched by a recording operation and switches between a recording operation and a playback operation, and a selection that switches between a normal recording operation and a memory recording operation. A switch, a memory circuit for storing a signal obtained from the microphone as a digital signal in a memory recording state by switching the recording / reproducing changeover switch and the selection switch for a predetermined time and reading the signal after the predetermined time; and the memory. It is composed of a voice conversion circuit for converting a digital signal read from the circuit into an analog signal, and a control switch which is switched at the start of memory recording and starts the running of the magnetic tape.

(E) Operation The present invention converts a signal obtained from a microphone into a digital signal and stores it in a memory circuit for a predetermined time, and after a predetermined time, converts a signal read from the memory circuit into an analog signal and records it on a magnetic tape. It is something that is done.

(F) Embodiment The illustrated circuit is an embodiment of the recording circuit of the present invention.
In the figure, (1), (2), (3), (4) and (5) are recording / playback selector switches for switching between recording operation and playback operation, respectively, and playback side terminals (1p), (2p ), (3p), (4p), (5p), recording side terminal (1r), (2r), (3r), (4r), (5r) and common terminal (1
c), (2c), (3c), (4c), (5c). (6) is a microphone for converting an acoustic signal into an electric signal, the output terminal of which is the recording side terminal of the recording / playback changeover switch (1).
It is connected to (1r). (7) is a recording / playback magnetic head that operates as a playback head during playback operation as well as a recording head during recording operation by the switching operation of the recording / playback changeover switch, and the first terminal of the coil forming the magnetic head is recording / playback. The playback side terminal (1p) and common terminal (2c) of the selector switch (1) are connected to the recording side terminal (2r) of the recording / playback selector switch (2) that is grounded, and the second terminal is the recording / playback switch. Playback side terminal (2p) of switch (2)
It is connected to the. (8) is the magnetic head during playback operation (7)
A preamplifier circuit to which a reproduced signal reproduced by is input and a recording signal obtained from the microphone (6) during a recording operation is input, and a switching operation of the preamplifier circuit (9) is controlled by the function of a control circuit described later. The signal control switch includes a first terminal (9a), a second terminal (9b), and a common terminal (9c) connected to the output terminal of the preamplifier circuit (8). (10) is a variable resistor for adjusting the level of the signal applied through the signal control switch (9), (11) is input the signal level-adjusted by the variable resistor (10) and The main amplification circuit that amplifies, (12) is a jack into which a plug such as an earphone is inserted, and the ground terminal (1
3), equipped with a signal terminal (14) connected to the output terminal of the main amplification circuit (11) and a switching terminal (15) that is disconnected from the signal terminal (14) when a plug is inserted ing. (16) is a speaker that applies a signal amplified by the main amplifier circuit (11) and outputs the signal when a plug is not inserted in the jack (12), and one end of a signal terminal is the Recording / playback selector switch that is connected to the jack (12) selector terminal (15) and the other end is grounded at the playback terminal (4p)
It is connected to the common terminal (4c) of (4). (17) and (18) are selection switches for switching the operation / non-operation of the repeat operation in the reproducing operation and the operation / non-operation of the memory recording operation in the recording operation.
a), the first terminals (17b) (18b) connected to the common terminals (17a) (18a) when the repeat and memory recording operations are not performed, and the common terminals (17a) (18a) when the repeat and memory recording operations are performed It is provided with the 2nd terminal (17c) (18c) connected with. (19) is a recording amplifying circuit to which a recording signal amplified by the preamplifying circuit (8) is input while being supplied with power during a recording operation and being in an operating state, and its output terminal is a common terminal (17a )
Is connected to the first terminal (17b) of the selection switch (17) connected to the second terminal of the recording / playback combined magnetic head (7). (20) is a battery which is a power source, (21) is an electric motor for running and driving a magnetic tape, (22) is a power switch which is closed when an operation such as recording and reproducing is performed, and is connected to the electric motor (21). It is inserted and connected in the power supply path of. Reference numeral (23) 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 (24) for outputting the converted digital signal. ) Is provided. (25) is a memory circuit for receiving the signal converted into the digital signal by the first voice conversion circuit (23) and storing the signal for a predetermined time (T ₁ ). ) Output terminal (24) and a write terminal (26) and a read terminal (27). (28) is a read terminal (2
The second voice conversion circuit receives the digital signal read from 7) and converts the digital signal into an analog signal, and the analog signal output terminal (29) is the second terminal of the signal control switch (9). (9b) and the common terminal (3c) are connected to the recording side terminal (3r) of the recording / playback changeover switch (3) connected to the second terminal (17c) of the selection switch (17). (30) is a control switch which is pressed and closed at the time of starting the repeat operation, canceling the repeat operation, starting the memory recording operation and canceling the memory recording operation, and (31) the memory circuit. A memory control circuit for controlling the memory operation of (25), (32) a recording / playback selector switch (5) whose playback side terminal (5p) is grounded, and a selection switch (18) whose common terminal (18a) is grounded. ) And the control switch (30) corresponding to the first voice conversion circuit (23), the memory control circuit (31), the second voice conversion circuit (28) and the signal control switch
A control circuit for controlling the operation of (9) and the like, which is H (high) according to the operation of the control switch (30) when in the operating state.
A control signal output terminal (33) for outputting a level signal and an L (low) level signal is provided. Selection switch (17) (18)
Is in the illustrated state, the first voice conversion circuit (2
3), the memory circuit (25) and the second audio conversion circuit (28) are in the inoperative state, the signal control switch (9) is in the illustrated state, and the control signal output terminal (33) is at the H level. The signal is output. When the selector switch (18) is switched to the position of the second terminal (18c) while in the playback state, the first
The voice conversion circuit (23) and the memory circuit (25) are brought into the operating state, and the conversion operation of an analog signal into a digital signal and the storage operation are performed. Then, the memory operation by the memory circuit (25) is controlled by the memory control circuit (31), but the signal stored in the memory circuit (25) is rewritten by the signal written one after another after being stored for a predetermined time. It will be. Control switch (30) when in such a state
When is closed by pressing, the writing operation to the memory circuit (25) is stopped, only the reading operation is performed, and the second voice conversion circuit (28) is brought into the operating state. Further, the signal control switch (9) is switched to the opposite side to the illustrated state, and the H level signal output to the control signal output terminal (33) is inverted to the L level. In this way, the control circuit (3
Although the control operation of 2) is performed, the operation at the time of recording will be described next. When the selection switch (18) is switched to the position of the second terminal (18c) in the recording state, the first voice conversion circuit (2
3), the memory circuit (25) and the second voice conversion circuit (28) are put into operation, and the conversion operation of an analog signal into a digital signal, the storage operation and the conversion operation of a digital signal into an analog signal are performed respectively. Further, the signal control switch (9) is switched to the opposite side to the state shown in the figure, and an L level signal is output to the control signal output terminal (33). When the control switch (30) is pressed and closed in such a state, the output signal of the control signal output terminal (33) is inverted from the L level to the H level, but the inversion operation of the output signal to the H level is After the memory circuit (25) starts the storing operation for the memory recording operation, which is performed as follows, the control switch (3
0) when the time to push the closing operation is performed and the T ₂ memory recording start operation after T time (T = T ₁ -T ₂₎
When (T ≧ 0) has passed, the output signal of the control signal output terminal (33) is inverted from the L level to the H level. (34) is a motor control circuit that controls the opening / closing operation of the motor control switch (35) inserted and connected in the power supply path to the motor (21), and applies an L level signal to the input terminal (36). During this time, the electric motor control switch (35) is opened. (37) is a pause switch that is switched to the opposite side to the state shown in the figure during the pause operation, and is a first terminal (37a) connected to the control signal output terminal (33) of the control circuit (32), Grounded second terminal (37b)
And a common terminal (37c) connected to the input terminal (36) of the motor control circuit (34). (38) is the control circuit (3
When the display output terminal provided in 2) is in the repeat playback operation state and in the memory recording operation state, H
A light emitting diode (39) is connected as a load while being configured to output a level signal. The recording 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 (22) is closed. When the power switch (22) is closed, power is supplied to each circuit and at the same time power is supplied to the electric motor (21) through the electric motor control switch (35) to perform a driving operation for reproducing the magnetic tape. The playback operation state is configured. The reproduction signal reproduced by the recording / playback combined magnetic head (7) is passed through the recording / playback selector switch (1) to the preamplifier circuit (8).
Is input to and amplified. The reproduction signal amplified by the preamplifier circuit (8) is applied to the variable resistor (10) through the signal control switch (9) to adjust its level. The reproduction signal whose level has been adjusted by the variable resistor (10) is input to the main amplification circuit (11) and amplified, and then applied to the speaker (16) and emitted. The user can hear the signal reproduced from the magnetic tape by performing such an operation, but in such a state, the selection switch (1
Since 8) is in the inoperative position, the first audio conversion circuit (23), the memory circuit (25) and the second audio conversion circuit (28) are inoperative.

The reproducing operation is performed as described above. Next, the repeat reproducing operation will be described. In such a repeat playback operation, when in the playback state, the selection switch (18) is set to the second terminal (18c).
This is done by pressing and closing the control switch (30) after switching to the position. When the selection switch (18) is switched to the position of the second terminal (18c), the operation of the control circuit (32) causes the first voice conversion circuit (23) and the memory circuit (25) to operate and the first voice conversion. The conversion operation of the analog signal to the digital signal by the circuit (23) and the storage operation by the memory circuit (25) are performed. In such a state, the reproduction signal amplified by the preamplifier circuit (8) is input to the first audio conversion circuit (23) and converted into a digital signal, and then output to the output terminal (24). The digital signal output to the output terminal (24) is input to the write terminal (26) provided in the memory circuit (25) and the memory control circuit (31).
It is stored in the memory circuit (25) by the storage control operation of. The signals stored in the memory circuit (25) are stored in the memory circuit (25) for a predetermined time, that is, T ₁ time, but are rewritten one after another by the signal input to the write terminal (26). . When the control switch (30) is pressed and closed in such a state, the control circuit (32) enters a state of performing a control operation for the repeat reproduction operation. When the control circuit (32) is in the state of performing the repeat reproduction operation, the signal control switch (9) is switched to the opposite side to the state shown in the figure and the H signal output to the control signal output terminal (33) is output.
The level signal becomes L level. The control signal output terminal
When the output signal of (33) becomes L level, the motor control circuit (34)
By the action of, the electric motor control switch (35) is opened and the power supply to the electric motor (21) is cut off. Further, the control circuit (32)
When the memory control circuit (31) works, the memory circuit is controlled by the memory control circuit (31).
The write operation of (25) is stopped, and the memory circuit (25) is in a state where the read operation is repeated. In addition, the second voice conversion circuit (28), which has been in the non-operation state until then, becomes the operation state and becomes in the state of converting the digital signal into the analog signal. At the read terminal (27) of the memory circuit (25), the signal of the predetermined time stored in the memory circuit (25) is repeatedly read. The signal read from the memory circuit (25) is converted into an analog signal by the second audio conversion circuit (28) and output to the output terminal (29), and the signal is a signal control switch (9) and a variable signal. It is input to the main amplification circuit (11) through the resistor (10). Therefore, when the repeat reproduction operation is performed, the signal stored in the memory circuit (25) is repeatedly emitted by the speaker (16), and the user repeatedly hears the same signal. You can When the repeat reproduction operation is being performed, the electric motor (21) is in a stopped state, so that the magnetic tape is in a stopped state and the tape recorder is in a temporarily stopped state. Further, when such a repeat reproduction operation is being performed, a signal of H level is output to the display output terminal (38) and the light emitting diode (39) is turned on, so that the user recognizes that the repeat reproduction operation is being performed. You can do it. When the control switch (30) is pressed and closed in such a repeat reproduction operation state, the repeat reproduction operation is released, and the signal control switch (9) returns to the illustrated state and the control signal output terminal (33) An H level signal is output. When an H level signal is output to the control signal output terminal (33), the electric motor control circuit (34) closes the electric motor control switch (35) to supply power to the electric motor (21). As a result, the drive of the magnetic tape is driven by the rotation of the electric motor (21), and the tape recorder is returned to the above-mentioned reproducing operation state.

The reproducing operation and the repeat reproducing operation are performed as described above. Next, the recording operation will be described. First select switch
(17) A normal recording operation in the state shown in (18) will be described. When the recording operation is performed in the state shown in the figure, the magnetic tape drive mechanism enters the recording operation state, the power switch (22) is closed, and the electric power is supplied to the electric motor (21). Drive operation is performed. 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 to the state shown in the figure, and each circuit switches the recording operation. It becomes a state to do. The recording signal converted into an electric signal by the microphone (6) when in the recording operation state is
It is input to the preamplifier circuit (8) through the recording / playback switch (1) and amplified. The recording signal amplified by the preamplification circuit (8) is input to the recording amplification circuit (19) and amplified, and then applied to the recording / playback magnetic head (7) through the selection switch (17). As a result, the magnetic head is attached to the magnetic tape that is being driven by the electric motor (21).
By the recording operation of (7), the recording signal obtained from the microphone (6) is recorded. Although the recording operation is performed in this way, since the signal path of the speaker (16) is cut off by the recording / playback changeover switch (4) in the recording operation state, the recording signal is emitted from the speaker (16). It is possible to suppress the occurrence of howling. Also, by inserting the earphone plug into the jack (12), the recorded signal can be heard or monitored by the earphone.

The normal recording operation is performed as described above. Next, the memory recording operation using the memory circuit (25) will be described. This memory recording operation is performed by selecting switches (17) (18)
Is switched to the second terminals (17c) and (18c) and a normal recording operation is performed. When such a switching operation and a recording operation are performed, the control circuit (32) enters a state of controlling the memory recording operation, and the control operation causes the signal control switch (9) to be switched to the opposite side of the illustrated state and the control signal. The L level signal is output to the output terminal (33). When an L level signal is output to the control signal output terminal (33), the electric motor control switch (35) opens the electric motor control switch (35) so that the magnetic tape is not driven. Also, the control circuit (32)
The function of the first voice conversion circuit (23), the memory circuit (2
5) and the second audio conversion circuit (28) are activated, the first audio conversion circuit (23) converts an analog signal into a digital signal, the memory circuit (25) performs a storage operation, and the second operation.
The conversion operation of the digital signal into the analog signal is performed by the voice conversion circuit (28). In such a state, the recording signal obtained from the microphone (6) is the preamplifier circuit.
It is input to (8), amplified, and then input to the first audio conversion circuit (23). The recording signal which is an analog signal input to the first audio conversion circuit (23) is converted into a digital signal and output to the output terminal (24). The digital signal output to the output terminal (24) is input to the write terminal (26) provided in the memory circuit (25) and stored in the memory circuit (25). The signal stored in the memory circuit (25) is
It is output to the read terminal (27) after a predetermined time, that is, T ₁ time. The digital signal output to the read terminal (27) is
It is input to the second audio conversion circuit (28), converted into an analog signal which is the original signal, and output to the output terminal (29). The recording signal output to the output terminal (29) is applied to the recording / playback magnetic head (7) through the recording / playback selector switch (3) and the selection switch (17), and the recording signal is the microphone (6). It is applied to the magnetic head (7) with a delay of T ₁ from the time when it is input to ()). Then, in such a state, the electric motor control switch (35) is opened, the power supply to the electric motor (21) is cut off, and the magnetic tape is not driven to run, so the magnetic head (7) records on the magnetic tape. No action is taken. In such a state,
If you make a comment that you want to write down during the meeting, the control switch
It is sufficient to press and close (30), but the recording / playback selector switch (5) is switched to the recording side and the second selector switch (18) is selected.
T ₂ ≧ when the terminal the control switch after starting the recording operation for the memory circuit by switching to (18c) side (25) of memory recording operation (30) has a time to press closes and T ₂ The operation in the case of T ₁ will be described. When the control switch (30) is pressed and closed in the relationship of T ₂ ≧ T ₁ , an H level signal is output to the control signal output terminal (33) and the display output terminal (38) provided in the control circuit (32). It is output immediately. When an H level signal is output to the control signal output terminal (33), the motor control circuit (34) closes the motor control switch (35). The motor control switch (35)
Is closed, power is supplied to the electric motor (21),
Since the magnetic tape is driven and driven by the rotation of (21), the signal output to the output terminal (29) of the second audio conversion circuit (28) and applied to the magnetic head (7) is applied to the magnetic head (7). Recorded on magnetic tape by. And the control switch
The recording signal recorded on the magnetic tape with the closing of (30) is the microphone (6) when the control switch (30) is closed.
Since the signal is not a signal input to the terminal, but a signal input before a predetermined time, that is, the storage time T ₁ of the memory circuit (25), the user hears the signal immediately before closing the control switch (30). The remarks that I wanted to write down will be recorded on the magnetic tape. Then, when the memory recording operation is being performed, the light emitting diode (39) is lit to indicate that the memory recording operation is being performed. The signal delayed by the memory circuit (25) is the magnetic head.
Although it is recorded on the magnetic tape by (7), if the content of the utterance does not have to be recorded, the control switch (30) may be pressed and closed. When the control switch (30) is closed by pressing, the H level signal output to the control signal output terminal (33) and the display output terminal (38) provided in the control circuit (32) becomes L level. . Control signal output terminal (33)
When the output signal of is at L level, the motor control circuit (34) operates to open the motor control switch (35). When the electric motor control switch (35) is opened, the electric power supply to the electric motor (21) is cut off, so that the running of the magnetic tape is stopped and the tape recorder enters the recording standby state. The pressing and closing operation for the memory recording operation of the control switch (30) is performed after the storage time of the memory circuit (25) elapses after there is no signal to be recorded on the magnetic tape. Further, while in the recording standby state, the magnetic tape stops running, but the first audio conversion circuit (23), the memory circuit (25) and the second audio conversion circuit (28) are controlled by the control circuit.
Since the conversion operation and the memory operation are respectively performed by the control operation of (32), if the pressing and closing operation of the control switch (30) is repeated, only the necessary information is selected in the meeting or lecture and the magnetic field is selected. Can be recorded on tape.

As described above, when the control switch (30) is pressed and closed in the relationship of T ₂ ≧ T ₁ , the operation is performed. Next, T ₁ > T ₂
Regarding the above, the operation when the control switch (30) is pressed and closed will be described. Such an operation is performed by, for example, setting the selection switch (18) to the second terminal in the normal recording state.
This is the operation when the control switch (30) is pressed and closed immediately after switching to the (18c) side, that is, before the time T _{1 has} elapsed.
When the pressing and closing operation of the control switch (30) is performed, an H level signal is output to the control signal output terminal (33) of the control circuit (32), but the output operation of the H level signal is T It is performed with a time delay (T = T ₁ -T ₂ ). Therefore, a signal unrelated to the memory recording operation, which is output from the read-out terminal (27) of the T time memory circuit (25) after the control switch (30) is closed, is not recorded on the magnetic tape. Further, when there is no signal stored in the memory circuit (25), no signal portion is formed on the magnetic tape. In this way, when the control switch (30) is closed in the relation of T ₁ > T ₂ , the magnetic tape is started to travel after T time (T = T ₁ −T ₂ ), so it is stored in the memory circuit (25). It is possible to prevent the recording operation of a signal not related to the memory recording operation on the magnetic tape and the forming operation of the non-signal portion which have been performed. Then, after the lapse of T time, the above-mentioned memory recording operation is performed.

The operation when the recording operation is performed from the stopped state is performed as described above. Next, the operation when the playback operation state is directly switched to the memory recording operation state will be described. When the selection switch (18) is in the position of the second terminal (18c) and the reproducing operation of the tape recorder is performed, the memory circuit (25) is in the storing operation. If the memory recording operation described above is performed in such a state, the recording / playback changeover switch (5) and the control switch (3
Along with the switching of 0), the control circuit (32) is in a state of performing the control operation for the memory recording operation. If the recording / playback changeover switch (5) is switched prior to the pressing and closing of the control switch (30), as described above, the time T (T) after the pressing and closing of the control switch (30) is completed. = T ₁ −
When T ₂ ) (however ≧ 0) has passed, an H level signal is output to the control signal output terminal (33) of the control circuit (32), and the memory recording operation is performed. Also, control switch (30)
Pressing closed elapses switching time T after namely T ₁ times of該録sound reproducing changeover switch for a T ₂ = 0 if made before the switching of recording and reproducing change-over switch (5) (5) of Then, an H level signal is output to the output terminal (33) of the control circuit (32) to perform the memory recording operation. In this way, when the playback operation state is directly switched to the memory recording operation state, an H level signal is output to the control signal output terminal (33) of the control circuit (32) in response to the switching operation. Therefore, it is possible to prevent the recording operation to the magnetic tape of the signal which is not related to the memory recording operation stored in the memory circuit (25) in the reproducing state.

Although the memory recording operation is performed as described above, if the earphone plug is inserted into the jack (12) in the memory recording operation state, the signal converted by the second voice conversion circuit (28) by the earphone, that is, the memory circuit (25 It is possible to easily recognize the timing of pressing and closing the control switch (30) because the delayed signal can be monitored by (1). Also, when the pause switch (37) is switched to the opposite side of the state shown in the playback or recording operation state, the motor control circuit (34) causes the motor control switch (35) to open and the motor (21). Since the power supply to the tape recorder is cut off, the tape recorder can be temporarily stopped.

The time stored by the memory circuit (25) is set to about 8 seconds when using a 256 Kbit RAM, for example, but the storage time can be easily changed by changing the memory capacity or sampling frequency. You can do it.

(G) Effect of the Invention The recording circuit of the present invention converts a recording signal obtained from a microphone into a digital signal and stores it in a memory circuit for a predetermined time, and after a predetermined time, converts a signal read from the memory circuit into an analog signal. Since the recording signal is recorded on the magnetic tape by delaying the recording signal by a predetermined time, it is possible to listen to the signal recorded on the magnetic tape before the recording operation is performed. I can. Therefore, the present invention has an advantage that only the necessary information can be selected and recorded on the magnetic tape by operating the control switch, and the magnetic tape can be effectively used.

Further, the present invention considers the time of the switching operation when performing the memory recording operation, that is, after the memory circuit starts the storage operation for the memory recording operation, the memory recording start operation is performed by operating the control switch. Since the start of running the magnetic tape was delayed according to the time until it was heard, the recording operation of the signal to the magnetic tape which was not related to the memory recording operation stored before the memory recording operation was performed in the memory circuit. The present invention has an advantage that it is possible to prevent a recording operation in a no signal state and, as a result, to prevent wasteful running of the magnetic tape.

[Brief description of drawings]

The circuit shown is an embodiment of the recording circuit of the present invention. Explanation of main figure numbers (6) …… Microphone, (7) …… Recording / playback magnetic head, (8) …… Preamplifier circuit, (9) …… Signal control switch,
(11) …… Main amplification circuit, (16) …… Speaker, (17) (18)…
… Selection switch, (19) …… Amplifying circuit for recording, (21) …… Motor, (23) …… First voice conversion circuit, (25) …… Memory circuit, (28) …… Second voice conversion circuit , (30) …… Control switch, (31) …… Memory control circuit, (32) …… Control circuit, (3
4) …… Motor control circuit, (35) …… Motor control switch.

Claims (1)

[Claims] 1. A recording / reproducing changeover switch which is switched by a recording operation and switches between a recording operation and a reproducing operation,
A selection switch for switching between a normal recording operation and a memory recording operation, and a signal obtained from a microphone in a memory recording state by switching the recording / playback changeover switch and the selection switch as a digital signal for a predetermined time.
(T ₁ ) A memory circuit for storing and reading out the signal after the predetermined time, a voice converting circuit for converting a digital signal read out from the memory circuit into an analog signal, and a magnetic tape which is switched at the start of memory recording When the memory recording operation is in progress, the recording switch records the signal read out after a predetermined time (T ₁ ) after being stored in the memory circuit and the memory circuit records the signal. When the time until the memory recording start operation by the control switch is performed after starting the memory operation for operation is (T ₂ ), T time (T = T ₁ −T ₂ ) after the memory recording start operation (however, T
≧ 0) A recording circuit of a tape recorder, characterized in that the start of running of a magnetic tape is delayed.