JPH0432058A - Sound recording operation control circuit for tape recorder - Google Patents

Abstract

PURPOSE:To perform the recording operation of an index signal even at the time of the absence of a recording signal by rotating and driving a motor independently of the presence or the absence of the recording signal from a microphone at the time of switching operation of an operation switch for index. CONSTITUTION:A motor driving circuit 23 which is set to the operating state to rotate and drive a motor 22 at the time of the presence of the recording signal obtained from a microphone 1, an operation switch 28 for index which is switched at the time of the recording operation of the index signal, and an index signal generating circuit 31 which is set to the operating state to generate the index signal at the time of the switching operation of the operation switch 28 for index are provided. Thus, the switching operation of the operation switch for index can be performed to record the index signal on a magnetic tape though running of the magnetic tape is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a tape recorder, and more particularly to a recording operation control circuit that controls recording operations.

(b) Prior Art Cassette-type tape recorders that use a cassette tape in which a magnetic tape is completely stored in a container called a cassette have become widespread. Such a cassette type tape recorder can be miniaturized and has excellent operability, so it is generally used as a means for recording the contents of meetings, etc. in place of memos. When recording the contents of a meeting or the like using a tape recorder, the length of the magnetic tape is often insufficient, and one of the reasons for this is that the magnetic tape may run even though there is no recorded conversation. In order to stop such wasteful running of the magnetic tape, a temporary stop operation is performed when there is no conversation to be recorded, but if this is done too many times, it will cause discomfort to the user. There is a technology that improves on this point by detecting the presence or absence of a recording signal obtained from a microphone, and rotating a motor to drive the magnetic tape only when there is a recording signal. For example, there is a method disclosed in Japanese Utility Model Application Publication No. 159536/1983.

In addition, a tape recorder called a dictating transcriber machine, which is used in conjunction with a typewriter, detects the index signal recorded on the magnetic tape while running at high speed, and locates the position where the necessary information has been recorded. It has the ability to search for.

(c) Problems to be Solved by the Invention The above-mentioned index signal is generally recorded at a low frequency of about 15 Hz, and is so sharp that it cannot be heard during playback operations at normal running speeds. Then, when driving at high speed to find the location where the necessary information is recorded, the 15Hz index signal becomes 20 times as high as 3.
By detecting this signal, it is possible to quickly find the location where the desired information is recorded and listen to the reproduction.

However, such a tape recorder has the function of recording the above-mentioned index signal onto magnetic tape.
When such a tape recorder is incorporated with a function of controlling the rotational operation of the electric motor by detecting the presence or absence of the recording signal described above, the following problems arise. In other words, if there is a recording signal obtained from the microphone, the magnetic tape is being driven, so if you perform the index signal recording operation, the index signal will be recorded on the magnetic tape, but if there is no recording signal, the magnetic tape will be recorded. Since the tape has stopped, the index signal will not be recorded. The present invention aims to provide a recording operation control circuit that is improved in this respect.

(d) Means for Solving the Problems The recording operation control circuit of the present invention includes a motor drive circuit that becomes active when there is a recording signal obtained from a microphone and rotates the motor, and a motor drive circuit that switches an index signal during recording operation. The indexing operation switch is composed of an indexing operation switch which is operated by the indexing operation switch, and an indexing signal generation circuit which generates an indexing signal when the indexing operation switch is switched into an operating state.

(*) Function The present invention is configured so that when an index operation switch is switched in order to record an index signal, the electric motor is driven to rotate regardless of the presence or absence of a recording signal obtained from the microphone.

(F) Example The illustrated circuit is an example of the recording operation control circuit of the present invention. <1) is a microphone that becomes operational during recording operation and converts an acoustic signal into an electrical signal; (2) is a microphone that converts an acoustic signal into an electric signal. (3) a preamplifier circuit that receives a recording signal obtained from the microphone (1) and amplifies the signal;
(4) is a recording amplifier circuit that receives the recording signal amplified by the preamplifier circuit (2) and amplifies the signal; (4) is a bias oscillation circuit that operates in a special oscillation mode during recording operation;
(5) is a magnetic head to which the recording signal amplified by the recording amplifier circuit (3) is applied together with the bias signal from the bias oscillation circuit (4), and has the function of recording the signal on the magnetic tape. are doing. (6) is a signal detection circuit that receives the recording signal amplified by the preamplifier circuit (2) and detects the presence or absence of the signal;
It is configured to output an H (high) level signal to the output terminal (7) when there is a recording signal. (8),
(9), (10), (11) and (12) are
A recording operation switch, a playback operation switch, a fast-forward operation switch, a rewind operation switch, and a stop operation switch, which are pressed and closed during recording, playback, fast forward, rewind, and stop operations, respectively; Operation switch (8)
, (9), (10), (11), (12
), the operation control circuit (14) controls each operation of the tape recorder based on the signals inputted by the operation of the operation control circuit (13). A recording switching circuit (16) is a recording switching circuit which puts the tape recorder into a recording operation state when the drive signal is fully output and the tape recorder enters an open operation state, and (16) is the operation control circuit (
(13) is a playback switching circuit that puts the tape recorder into a playback operation state when the tape recorder enters an open operation state in which an H-level drive signal is output to the playback output terminal (17) provided in the playback output terminal (17); a fast-forward switching circuit (2) which brings the tape recorder into a fast-forward operating state at the same time as it enters an open operating state in which an H-level drive signal is output to a fast-forward output terminal (19) provided in the control circuit (13);
0) is a winding state in which the tape recorder is brought into a rewinding state at the same time that an H level drive signal is output to the rewinding output terminal (21) provided in the operation control circuit (13). This is a return switching circuit. (22)
(23) is a motor drive circuit that controls the rotational operation of the electric motor (22), and when an H level signal is fully applied to the control terminal (24), the electric motor is activated. (22) is configured to rotationally drive the operation control circuit (25>).
13) and the motor drive circuit (
This is a motor control terminal connected to the control terminal (24) of 23), and is configured so that an H level signal is output when each operation is performed. (26) is the detection operation of the signal detection circuit (6), that is, the presence/absence of the recording signal.
A selection switch (27>) that is closed when controlling the recording operation by detecting the absence of the signal is connected to the operation control circuit (27).
13), and is connected to the output terminal (7) of the signal detection circuit (6). (28> is an index operation switch that is pressed and closed during the index signal recording operation, and (29) is provided in the operation control circuit (13) and connected to the motor drive circuit (23) via a diode (30>). ) is an index control terminal connected to the control terminal (24) of the index control terminal (24), and is configured to output an H level signal for a predetermined period of time when the index operation switch (28) is pressed and closed. (31) is the index control terminal (
This is an index signal generation circuit which outputs an index signal of, for example, 15 Hz to an output terminal (32) when the output terminal (32) enters an open operation state in which an H level signal is output to the output terminal (32). (5) Connection is established. In this circuit configuration, if a recording operation is performed while the selection switch (26) is closed, the motor is controlled only when an H level signal is applied to the detection signal input terminal (27). terminal (2
5) is configured so that an H level signal is output. As described above, the recording operation control circuit of the present invention has been constructed, and the operation of this circuit will now be described.

When the playback operation switch (9), fast forward operation switch (10), or rewind operation switch (11) provided on the tape recorder is pressed and closed, the playback operation switch provided on the operation control circuit (13) is closed. Output terminal (17), fast forward output terminal (19) or rewind output terminal (21)
An H level signal is output to the motor control terminal (25), and an H level signal is output to the motor control terminal (25). the result,
The playback switching circuit (16), the fast forwarding switching circuit (18), or the rewinding switching circuit (20) becomes operational to put the tape recorder in each operating state, and the electric motor (22) is activated by the motor drive circuit (23). A driving operation is performed,
The tape recorder is brought into each operating state. When the stop operation switch (12) is pressed and closed while the tape recorder is in each operating state, the playback output terminal (17) is closed.
), output terminal for fast forwarding (19>) or output terminal for rewinding (
The output signal of the motor control terminal (25) is inverted from the H level to the L (lower) level, and the output signal of the motor control terminal (25) is inverted from the H level to the L level. As a result, the playback switching circuit (16), fast forwarding switching circuit (18), or rewinding switching circuit (20) becomes inoperative, and the motor drive circuit (23) becomes inactive, and the tape recorder It is forced to return to the stopped state.

The playback, fast-forwarding, and rewinding operations are performed as described above, but the recording operation will be explained next. Selection switch (2
6) is in the open state shown in the figure, that is, the case where the recording operation is performed regardless of the presence or absence of a recording signal obtained from the microphone (1) will be explained. When the recording operation switch (8) is pressed and closed, an H level signal is output to the recording output terminal (15) and the motor control terminal (25>) provided in the operation control circuit (13). As a result, the recording switching circuit (14) becomes operational, putting each circuit and the magnetic converter (1) etc. into a recording operation state, and the motor drive circuit (23) switches the electric motor (22) into the operating state.
) is performed and the tape recorder enters the recording operation state. The recording signal converted into an electrical signal by the microphone (1) is input to the pre-amplifier circuit 2), amplified, and then input to the recording amplifier circuit (3). Said recording amplifier circuit (3) The recording signal input to the is amplified and then applied to the magnetic head (5) together with the bias signal from the bias oscillation circuit (4), and is recorded onto the magnetic tape by the magnetic head (5). The recording operation of the recording signal obtained from the microphone (1>) is performed, but when recording the index signal which is the positioning signal, it is sufficient to press the index operation switch 28) to close it.Such recording operation When the index operation switch (28) is pressed and closed in this state, an H level signal is output to the index control terminal (29) provided in the operation control circuit (13).

When an H level signal is output to the index control terminal (29), the index signal generation circuit (31) becomes operational and outputs an index signal to its output terminal (32).The index signal generation circuit ( 31)
The index signal outputted to the output terminal (32) is applied to the magnetic head (5) together with the bias signal from the bias oscillation circuit (4) and recorded on the magnetic tape. Then, after a predetermined time has elapsed, the index control terminal (29)
The output signal of is inverted from the H level to the L level, and the index signal generation circuit (31) becomes inactive. If the index operation switch (28) is pressed and closed when the tape recorder is in the recording mode, the index signal can be recorded on the magnetic tape for a predetermined period of time.When the tape recorder is in the recording mode, the stop switch When the operation switch (12) is pressed and closed, the operation control circuit (1
The output signals of the recording output terminal (15) and the motor control terminal (25) provided in 3) are inverted from the H level to the L level. As a result, the recording switching circuit (14) and the motor drive circuit 23) become inoperative, and the tape recorder returns to its stopped state.

As described above, a normal recording operation is performed, but next recording is performed when the selection switch (26) is in a closed state, that is, when the rotational operation of the electric motor (22) is controlled depending on the presence or absence of a recording signal. The operation will be explained. When the selection switch (26) is in the closed state, the recording operation switch (
8) is pressed to close, an H level signal is output to the recording output terminal (15) provided in the operation control circuit (13). As a result, the recording switching circuit (14) becomes operational, and as described above, each circuit and the magnetic head (5)
etc. to perform recording operation. If there is no recording signal obtained from the microphone (1) when such a switching operation is performed, an L level signal is not output to the output terminal (7) of the signal detection circuit (6). ,
The detection signal input terminal (27) provided in the operation control circuit (13) is in a state where an L level signal is fully applied. Therefore, an H level signal is not output to the motor control terminal (25>) provided in the operation control circuit (13), and the motor drive circuit (23) controls the motor (22).
) is not performed, so the magnetic tape is in a state where it stops running. In this state, when an audio signal is input to the microphone (1), the signal is converted into an electrical signal and input to the preamplifier circuit (2) as a recording signal. The recording signal input to the preamplifier circuit (2) is amplified and then applied to a recording amplifier circuit (3) and a signal detection circuit (6). As a result, the signal detection circuit (6
) is performed and an H level signal is output to its output terminal (7>), so the operation control circuit (13)
An H-level signal is applied to the detection signal input terminal (27) provided at. When an H level signal is applied to the detection signal input terminal (27), an H level signal is output to the motor control terminal (25) provided in the operation control circuit (13), and the signal drives the motor. circuit(
23) is applied to the control terminal (24).

As a result, the motor drive circuit (23) becomes operational and drives the motor (22) to rotate, so that the magnetic tape can start running, and the recording signal is recorded on the magnetic tape by the magnetic head (5). . When the audio signal is input to the microphone (1) in this manner, the running operation of the magnetic tape is started, and a recording signal is recorded on the magnetic tape. When the signal input to the microphone (1) disappears during such a recording state, the output signal of the output terminal (7) of the signal detection circuit (6) is inverted from the H level to the L level, and as a result, the motor control The output signal of the terminal (25) becomes L level, and the motor drive circuit (23) becomes inactive, so the motor (22) stops rotating.Therefore, when there is no audio signal to record, the vehicle is not driven. Since the magnetic tape stops running, unnecessary running of the magnetic tape can be prevented.Selection switch (
26) is in the closed state, the recording operation is performed as described above.Next, when the index operation switch (28) is pressed to close the index operation switch (28), the recording operation is performed as described above. The operation will be explained. When the index operation switch (28) is pressed and closed, an H level signal is output for a predetermined period of time to the index control terminal (29) provided in the operation control circuit (13) as described above. The H level signal output to the index control terminal (29) is output from the index signal generation circuit (
31) as well as to the control terminal (24) of the motor drive circuit (23) via the diode (30). Therefore, a state in which no H level signal is output to the motor control terminal (25) provided in the operation control circuit (13), that is, there is no recording signal obtained from the microphone (1) and the magnetic tape stops running. The motor (22) is operated by the motor drive circuit (23) even in the
The rotational driving operation is performed to drive the magnetic tape to run. Since the magnetic tape is driven in this way, the index signal output from the index signal generating circuit 31) is recorded on the magnetic tape by the magnetic head (5). Then, after a predetermined period of time has elapsed, the output signal of the index control terminal (29) is inverted from the H level to the L level, and the index signal generation circuit (3
1) becomes inactive. Index control terminal (29
) is reversed to the L level, and if the output signal of the motor control terminal (25) is at the H level, the magnetic tape will not stop running and the recording signal obtained from the microphone (1) will be recorded on the magnetic tape. If recording is complete and the output signal is at L level, the magnetic tape will stop running. In this way, when the selection switch (26) is in the closed recording state, the index operation switch (28)
When the magnetic tape is pressed closed, the magnetic tape starts running, so that an index signal can be recorded on the magnetic tape.

In this embodiment, the operation of the motor drive circuit (23) is controlled by the signal output from the index control terminal (29) during the recording operation of the index signal, but the output of the motor control terminal (25) It can also be configured to be controlled by a signal.

In addition, this embodiment is also used as a signal detection circuit (6) and an operation control circuit (6).
13), an index signal generating circuit (31), etc., but the circuit configuration can be simplified by using a microcomputer.

(G) Effects of the Invention The present invention is such that when an index operation switch is switched in order to record an index signal on a magnetic tape, the motor is driven to rotate regardless of the presence or absence of a recording signal obtained from a microphone. Therefore, the index signal can be recorded on the magnetic tape even if the indexing operation switch is switched when the magnetic tape is stopped running.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the recording operation control circuit of the present invention. Explanation of main drawing numbers (1)...Microphone, (2>...Preamplifier circuit, (3)...Recording amplifier circuit, (5)...Magnetic head, (6)...・Signal detection circuit, (13)...
・Operation control circuit, (14)...Recording switching circuit, (
22)...Electric motor, <23)...Motor drive circuit, (26)...Selection switch, (28)...Index operation switch, (31)...Index signal generation circuit.

Claims (1)

[Claims] (1) In a tape recorder configured to control the rotational operation of a motor by detecting the presence or absence of a recording signal obtained from a microphone, and to perform a recording operation by rotating the motor only when there is a recording signal. , a motor drive circuit that becomes operational when there is a recording signal obtained from the microphone and drives the motor to rotate, an index operation switch that is switched when an index signal is recorded, and an operation state when the index operation switch is switched. It consists of an index signal generation circuit that generates an index signal as the
When the index operation switch is operated, the electric motor is driven to rotate regardless of the presence or absence of a recording signal from the microphone, thereby recording the index signal output from the index signal generation circuit on a magnetic tape. A recording operation control circuit for a tape recorder.