JPH0587882B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a recording and reproducing circuit for a tape recorder, and particularly to a recording and reproducing circuit suitable for a tape recorder used as a memo.

(b) Conventional technology Tape recorders, which are used in place of notes and are also used in conjunction with typewriters, have become widespread.
With such a tape recorder, if it is difficult to hear or if it is unclear, it is necessary to repeatedly rewind and then play back the magnetic tape, which is very inconvenient. As a technique that improves this point, there is a technique in which a signal reproduced from a magnetic tape is stored as a digital signal in a memory circuit, and the signal stored in the memory circuit is repeatedly reproduced. For example, there is one disclosed in Japanese Patent Laid-Open No. 19202/1983. Also, the tape recorder
It is often used to record the contents of meetings and lectures, but when performing such recording operations, the length of the magnetic tape is often insufficient, and the reason for this is that there is no audio signal to be recorded. There are cases where the magnetic tape runs regardless. As an improvement on this point, there is a technique in which the electric motor is rotated to drive the magnetic tape only when there is a recording signal obtained from a microphone.An example of such a technique is Utility Model Publication No. 56-433.
There is something disclosed in the publication No. Further, the tape recorder used in place of the memory is constructed so that it can be switched directly from the playback state to the recording operation state, that is, without performing a stop operation.

(C) Problems to be Solved by the Invention Although it is true that the technology disclosed in Japanese Utility Model Publication No. 433 of 1983 eliminates unnecessary running of the magnetic tape and makes effective use of the magnetic tape, the following problems arise. There's a problem. That is, in such a recording operation, the entire content of the meeting or lecture is recorded on the magnetic tape, so when the signals recorded on the magnetic tape are to be reproduced and listened to, it is necessary to reproduce them for the time required for recording. The important parts of the signals recorded in this way are generally very small, and such parts are often memorized during meetings or lectures. Reproducing all of the signals recorded in this way is a waste of time. Also, the above-mentioned Japanese Patent Application Publication No. 59-19202
The memory circuit described in the publication is uneconomical because it is used only during playback operations. The present invention aims to provide a recording/playback circuit that is improved in this respect.

(d) Means for Solving the Problems The recording/playback circuit of the present invention stores a recording signal obtained from a microphone during a recording operation for a predetermined time in a memory circuit used for repeat playback during a playback operation, and The signal read out from the circuit is recorded on a magnetic tape, and when switching from the playback state to the recording state, the operation of applying the recording signal to the magnetic head is blocked for at least the same time as the storage time of the memory circuit. be.

(e) Effects The present invention allows efficient recording operation by using a memory circuit used for repeat playback during playback operation during recording operation.

(F) Embodiment The illustrated circuit is an embodiment of the recording/playback circuit of the present invention. In the same figure, 1, 2, 3, 4, and 5 are recording/playback switching switches, and the playback side terminals 1p, 2p, 3p, 4p, 5p, and the recording side terminal 1, respectively.
r, 2r, 3r, 4r, 5r and common terminal 1c,
It is equipped with 2c, 3c, 4c, and 5c. 6 is a microphone that converts an acoustic signal into an electric signal, and its output terminal is connected to the recording/playback switch 1.
is connected to the recording side terminal 1r. Reference numeral 7 denotes a recording/playback magnetic head which operates as a playback head during playback and also as a recording head during recording according to the switching operation of the recording/playback switch 1, and its first terminal is connected to the playback side of the record/playback switch 1. Recording side terminal 2 of the recording/playback switch 2, where the terminal 1p and the common terminal 2c are grounded.
r, and the second terminal is connected to the playback side terminal 2p of the recording/playback switch 2. Reference numeral 8 denotes a preamplifier circuit into which a reproduction signal reproduced by the magnetic head 7 is input during a reproduction operation, and a recording signal obtained from the microphone 6 during a recording operation is input; 9 is the preamplifier circuit. A variable resistor 8 is applied with a signal amplified by the variable resistor 9 and adjusts the level of the signal; 10 is a main resistor 10 to which a signal whose level has been adjusted by the variable resistor 9 is input and amplifies the signal. The amplifier circuit 11 is a speaker to which the signal amplified by the main amplifier circuit 10 is applied and 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 switch 4 whose playback side terminal 4p is grounded. Reference numerals 12 and 13 indicate selection switches for selecting between normal recording operation and memory recording operation, which include common terminals 12c and 13c, first terminals 12a and 13a connected to the common terminals 12c and 13c during normal recording operation, and memory. a second terminal 12b connected to the common terminals 12c and 13c during recording operation;
13b. 14 is the preamplifier circuit 8
This is a recording amplifier circuit which receives a signal amplified by the magnetic head 7 and amplifies the signal. 1 terminal 12a. 15 and 16 are repeat and pause switches that control repeat operation and pause operation, and common terminals 15c and 16
c, the common terminal 15c, 1 when in the inactive state
6c and the common terminal 1 when in the repeat or pause state.
2nd terminals 15b, 16 connected to 5c, 16c
It is equipped with b. 17 is a battery as a power source; 18 is an electric motor that drives the magnetic tape; 19 is a power switch that is closed when operations such as recording and playback are performed; Repeat/pause switch 1 whose first terminal 16a is connected to the electric motor 18
The second terminal 19b is connected to the common terminal 16c of the switch 6 and the second terminal 13b of the selection switch 13. A first audio conversion circuit 20 receives the signal amplified by the preamplifier circuit 8 and converts the signal into a digital signal, and is provided with an output terminal 21 for outputting the digital signal. 22 is a memory circuit into which the signal converted into a digital signal by the first audio conversion circuit 20 is input and stores the signal for a predetermined time;
Write terminal 23 connected to output terminal 21 of
and a read terminal 24. Reference numeral 25 denotes a second audio conversion circuit to which the digital signal read from the readout terminal 24 of the memory circuit 22 is input and converts the signal into an analog signal, and the output terminal 26 of the analog signal is connected to the reproduction side terminal 3p.
is the recording/playback selector switch 3 connected to the second terminal 15b of the repeat/pause switch 15.
is connected to the common terminal 3c. 27 is a memory recording switch that is closed when the memory recording operation is performed and opened when the memory recording operation is canceled; 28;
are recording/playback selector switch 5, selection switch 13,
A control circuit 29 controls the operations of the first audio conversion circuit 20, the memory circuit 22, and the second audio conversion circuit 25 in response to switching of the repeat/pause switch 16 and the memory recording switch 27; This is a motor control circuit that controls the opening/closing operation of a control switch 30 whose operation is controlled by 28 and which is inserted and connected into the power supply path to the electric motor 18. When the memory recording operation is performed by switching, the control switch 30
When the memory recording operation switch 27 is closed, the control switch 30 is closed. Reference numeral 31 denotes a signal control switch which is normally closed and is opened by the action of the control circuit 28 when the repeat playback operation is performed.
and a second terminal 31b connected to the signal application terminal of the variable resistor 9 and the common terminal 15c of the repeat/pause switch 15. 32 is closed when in the memory recording state by the action of the control circuit 28, and is opened for at least the same time as the storage time of the memory circuit 22 when the playback operation state is switched to the memory recording operation state. This is a recording control switch, and includes a first terminal 32a connected to the second terminal 12b of the selection switch 12, and a second terminal 32b connected to the recording side terminal 3r of the recording/playback changeover switch 3. In such a circuit configuration, the time stored by the memory circuit 22 is, for example, 256K.
When using bit RAM, it is set to about 8 seconds. The storage operation by the memory circuit 22 is controlled by the control circuit 28, and the signals input to the write terminal 23 are stored in the memory circuit 22 one after another and one after another after a predetermined time, that is, 8 seconds. is output to the read terminal 24, and when the state is switched to a repeat operation, the write operation to the memory circuit 22 is stopped and the read operation is repeated.
Further, the recording amplifier circuit 14 is in an inactive state during a playback operation, and becomes active when power is supplied during a recording operation. The recording and reproducing circuit of the present invention is constructed as described above, and the operation of this circuit will now be described.

The illustrated state is a stopped state, and if a reproducing operation is performed in such a state, the magnetic tape drive mechanism enters the reproducing operation 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/pause switch 16 and the control switch 30 to drive the magnetic tape and supply power to each circuit. Actions are performed to configure a playback operating state. The reproduced signal reproduced by the recording/reproducing magnetic head 7 is input to the preamplifier circuit 8 through the recording/reproducing switch 1 and is amplified. The reproduced signal amplified by the preamplifier circuit 8 is applied to the variable resistor 9 through the signal control switch 31, and its level is adjusted. The signal whose level has been adjusted by the variable resistor 9 is input to the main amplifier circuit 10 and amplified, and then applied to the speaker 11 to emit sound. After such an operation is performed, the user can listen to the signal reproduced from the magnetic tape. Further, when in the playback operating state, the first audio converting circuit 20, the memory circuit 22, and the second audio converting circuit 25 are in an operating state due to the action of the control circuit 28, and the analog signal from the first audio converting circuit 20 is A conversion operation into a digital signal and a storage operation by the memory circuit 22 are performed. That is, in such a state, the reproduced signal amplified by the preamplifier circuit 8 is input to the first audio conversion circuit 20 and converted into a digital signal, and then sent to the output terminal 21.
is output to. The digital signal output to the output terminal 21 is input to the write terminal 23 provided in the memory circuit 22, and the digital signal is input to the write terminal 23 provided in the memory circuit 22.
2 is stored. The signal stored in the memory circuit 22 is stored in the memory circuit 22 for a predetermined period of time, that is, 8 seconds.
The information stored in the memory circuit 22 is successively rewritten by signals input to the write terminal 23.

The reproduction operation is performed as described above, but the repeat operation will be explained next. Such a repeat operation is performed by switching the repeat/pause switches 15 and 16 to the opposite side from the illustrated state when in the above-described reproducing operation state. When the repeat/pause switch 16 is switched to the opposite side from the state shown, the power supply to the motor 18 is cut off and a switching signal is input to the control circuit 28, which controls the repeat operation. It is now in a state where control operations can be performed. The control circuit 28
When the repeat operation is controlled, the signal control switch 31 is opened and the write operation of the memory circuit 22 is stopped.
2 is a state in which read operations are repeatedly performed. That is, at the read terminal 24 of the memory circuit 22,
The 8 second signal stored in the memory circuit 22 will be read out repeatedly. The signal read out from the memory circuit 22 is converted into an analog signal by the second audio conversion circuit 25 and outputted to the output terminal 26, but this signal is sent to the recording/playback selector switch 3 and the repeat/pause switch. 1
5 and a variable resistor 9 to the main amplifier circuit 10. Therefore, when the repeat operation is performed, the signal stored in the memory circuit 22 will be repeatedly emitted by the speaker 11, and the user will not be able to listen to the same signal over and over again. I can do it. When such a repeat operation is being performed, the electric motor 18 is in a stopped state, so the magnetic tape is in a stopped state, and the tape recorder is in a temporarily stopped state. When the repeat/pause switches 15 and 16 are switched to the state shown in the figure while in the repeat playback mode, the magnetic tape starts running and the normal playback operation is performed by the action of the control circuit 28. was forced to return to

Although the reproduction operation and repeat operation are performed as described above, the recording operation will be explained next. first,
A normal recording operation in which the selection switches 12 and 13 are in the illustrated state will be described. When a recording operation is performed in the state shown in the figure, the magnetic tape drive mechanism enters the recording operation state, and the power switch 19 is closed to supply power to the electric motor 18, which drives the magnetic tape for recording operation. An action is taken. Further, when a recording operation is performed, the recording/reproduction changeover 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 enters a state for performing a recording operation. In such a recording operation state, the recording signal converted into an electrical signal by the microphone 6 is input to the preamplifier circuit 8 through the recording/playback switch 1 and amplified. The recording signal amplified by the preamplifier circuit 8 is input to the recording amplifier circuit 14, amplified, and then applied to the recording/reproducing magnetic head 7 through the selection switch 12. As a result, the electric motor 18
The recording signal obtained from the microphone 6 is recorded by the recording operation of the magnetic head 7 onto the magnetic tape which is being driven to run by the magnetic tape. Although the recording operation is performed in this way, since the signal path of the speaker 11 is cut off by the recording/playback switch 4 when in the recording operation state, the recording signal is not emitted from the speaker 11. , the occurrence of howling can be suppressed.

The normal recording operation is performed as described above, but next, the memory recording operation using the memory circuit 22 will be explained. This memory recording operation is
This is done by first switching the selection switches 12 and 13 to the opposite side from the state shown, and performing a normal recording operation. When such switching operation and recording operation are performed, the control circuit 28 enters a state where it performs the control operation of the memory recording operation, and the motor control circuit 2
9 opens the control switch 30, and the control circuit 28 closes the recording control switch 32. Further, the control circuit 28
The first audio conversion circuit 20, the memory circuit 22, and the second audio conversion circuit 25 are brought into operation by the function of
2, and the second audio conversion circuit 25 performs a conversion operation of the digital signal into an analog signal. In this state, the recorded signal obtained from the microphone 6 is input to the preamplifier circuit 8, amplified, and then input to the first audio conversion circuit 20. The recording signal, which is an analog signal, input to the first audio conversion 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 input to a 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 outputted to the readout terminal 24 is inputted to the second audio conversion circuit 25, converted into an analog signal which is the original signal, and outputted to the output terminal 26. The recording signal output to the output terminal 26 is
Recording playback switch 3, recording control switch 32
The recording signal is applied to the recording/playback magnetic head 7 through the selection switch 12, but the recording signal is applied to the magnetic head 7 with a delay of 8 seconds from when it is input to the microphone 6. In such a state, the control switch 30 is opened and the power supply to the electric motor 18 is cut off, so that the magnetic tape is not driven and the magnetic head 7 is not driven.
No recording operation is performed on magnetic tape. In such a situation, if there is a comment that one would like to take a note of during the meeting, the memory recording switch 27 can be closed. When the memory recording switch 27 is closed, the control switch 30 is closed by the operation of the motor control circuit 29 based on 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 rotation of the electric motor 18 drives the magnetic tape, so that the output terminal 2 of the second audio conversion circuit 25
6 and applied to a magnetic head 7 is recorded on a magnetic tape by the magnetic head 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 6 when the recording switch 27 is closed, but is the signal input eight seconds before. Therefore, the utterance that the user heard just before closing the memory recording switch 27 and wanted to take a memo will be 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 statement does not need to be recorded, the memory recording switch 27 is released. good. The memory recording switch 27
When the control switch 30 is opened, the control switch 30 is
will be released. When the control switch 30 is opened, the power supply to the electric motor 18 is cut off, so that the magnetic tape stops running and the tape recorder enters a recording standby state. The opening operation of the memory recording switch 27 is performed after about 8 seconds have elapsed since the signal to be recorded on the magnetic tape disappears. In addition, when in the recording standby state, the magnetic tape stops running, but the first audio conversion circuit 20, memory circuit 22, and second audio conversion circuit 25 each perform a conversion operation under the control operation of the control circuit 28. Since the memory recording switch 27 is closed and opened repeatedly, only the necessary information in a meeting or lecture can be selected and recorded on the magnetic tape. .

As described above, the operation is performed when the recording operation is performed from the stopped state.Next, the operation when switching from the playback operation state to the direct memory recording operation state will be explained. Even if the selection switches 12 and 13 are switched to the opposite side from the state shown in the figure and the memory recording switch 27 is closed when the tape recorder is in the playback state described above, the tape recorder is still in the playback state, so the control for the memory recording operation is performed. Control circuit 28 is never switched to a state in which it performs an operation. In this state, the recording/playback switches 1, 2, 3, 4, and 5, which perform the recording operation, are switched to the recording side, and the control circuit 28 enters a state in which it performs the control operation for the memory recording operation. When such a switching operation is performed, the recording control switch 32, which is inserted into the recording signal path to the magnetic head 7, is held open for a predetermined period of time, that is, 8 seconds, which is the storage time of the memory circuit 22. . Therefore,
During the reproduction operation state, the signals stored in the memory circuit 22 are not applied to the magnetic head 7 and are not recorded on the magnetic tape. After a predetermined period of time has elapsed, the recording control switch 32, which had been in the open state, is closed, and the aforementioned memory recording operation is started.

As described above, the normal recording operation and the memory recording operation using the memory circuit 22 are performed, but in any recording operation state, when the repeat/pause switches 15 and 16 are switched, power is supplied to the motor 18. is cut off, allowing the tape recorder to be temporarily stopped.

In this embodiment, the storage operation time by the memory circuit 22 is set to 8 seconds, but the storage operation time can be changed by changing the memory capacity, sampling frequency, etc. used in the memory circuit 22.

(g) Effects of the Invention The recording and reproducing 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 period of time, and also records the signal read out from the memory circuit after a predetermined period of time on a magnetic tape. Since the recording signal is recorded on the magnetic tape with a predetermined delay, the signal recorded on the magnetic tape can be heard before the recording operation is performed. Therefore, the present invention has the advantage that only necessary information can be selected and recorded on the magnetic tape, and the magnetic tape can be used effectively.

In addition, the present invention utilizes a memory circuit used for repeat playback during playback operation as a memory circuit that delays the recording signal for a predetermined period of time during memory recording operation, so it is possible to suppress increases in manufacturing costs. It has an effect.

Furthermore, according to the present invention, when switching from the playback mode to the memory recording mode without performing a stop operation, the operation of applying the recording signal to the magnetic head is blocked for at least the same period of time as the storage time of the memory circuit. The signals stored in the memory circuit during the playback mode will not be recorded onto the magnetic tape, and even if you switch directly from the playback mode to the memory recording mode, only the recording signal obtained from the microphone will be recorded on the magnetic tape. The present invention has the effect that the switching operation from the playback state to the memory recording operation state can be performed without any problem.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the recording/playback circuit of the present invention. Explanation of main drawing numbers, 6... Microphone, 7...
...Magnetic head for both recording and playback, 8...Preamplifier circuit, 10...Main amplifier circuit, 11...Speaker,
12, 13... Selection switch, 14... Recording amplifier circuit, 15, 16... Repeat/pause switch, 18... Electric motor, 20... First audio conversion circuit, 22... Memory circuit, 25... ...Second audio conversion circuit, 27...Memory recording switch, 2
8... Control circuit, 29... Motor control circuit, 30
...Control switch, 31...Signal control switch,
32... Recording control switch.

Claims (1)

[Claims] 1. In a tape recorder that is equipped with a microphone and a magnetic head and can be switched directly from the playback state to the recording state without stopping, the signal played by the magnetic head during playback operation is converted into a digital signal and converted into a predetermined digital signal. A memory circuit that stores time and repeatedly reads the stored signal during repeat operation, and a magnetic head that controls the storage operation of the signal in the memory circuit and the readout operation of the signal stored in the memory circuit. and a control circuit that controls the operation of outputting a playback signal from the microphone and the operation of applying a recording signal to the magnetic head, and stores the recording signal obtained from the microphone in the memory circuit for a predetermined period of time during a recording operation, and performs a memory recording operation. When a signal read out after a predetermined time delay from the memory circuit is applied to the magnetic head and recorded on the magnetic tape, and when the playback state is switched to the memory recording state, the signal is at least the same as the storage time of the memory circuit. 1. A recording and reproducing circuit for a tape recorder, characterized in that the application of a signal read from the memory circuit to a magnetic head is prevented for a time.