JPH0734480Y2 - Power control circuit for voice recording / playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field of the Invention The present invention converts a recording signal obtained from a microphone into a digital signal and stores the digital signal in a semiconductor memory circuit, and the semiconductor memory circuit during a reproducing operation. The present invention relates to a voice recording / reproducing apparatus which reads out a signal, converts it into an analog signal, and outputs the sound through a speaker, and particularly relates to a power supply control circuit.

(B) Conventional technology Cassette type tape recorders that use magnetic tapes called cassette tapes have become widespread as a device for recording and reproducing sound. An apparatus using a magnetic tape as a means for recording an audio signal like such a cassette type tape recorder has an advantage that it can perform a recording operation for a long time, but it is difficult to downsize the apparatus. There is a problem that the failure rate is high because a mechanism for driving the magnetic tape to run is required. As a device improved in this respect, an audio signal is converted into a digital signal and stored in a semiconductor memory, and at the time of a reproducing operation, a signal stored in the semiconductor memory is read out and then converted into an analog signal and sound is emitted from a speaker. The technology developed in this way has been developed.
There is one disclosed in the publication.

(C) Problems to be Solved by the Invention In the technology disclosed in the above-mentioned publication, since a semiconductor memory is used as a means for recording an audio signal, a drive mechanism such as a tape recorder is unnecessary, and It has the advantage that it can be downsized and the failure rate can be reduced. In such a device, the semiconductor memory is attachable to and detachable from the main body, but when power is supplied to the amplifier circuit and the like incorporated in the main body when the semiconductor memory is not attached, the power from the battery is removed. It will be wasted. The present invention is intended to provide a power supply control circuit that solves such a problem.

(D) Means for Solving the Problems The power supply control circuit of the present invention is incorporated in the main body and a memory container that is removable from the main body and has a semiconductor memory circuit and a backup power supply incorporated therein. And an amplification circuit for amplifying the audio signal, and an audio processing circuit incorporated in the main body and for converting the audio signal into a digital signal and a digital signal into the audio signal, and incorporated into the main body. And a control circuit for controlling the conversion operation by the audio processing circuit, the writing operation to the semiconductor memory circuit, and the reading operation of the signal stored in the semiconductor memory circuit, the battery incorporated in the main body, and the main body And a power switch for controlling the power supply operation from the battery to the amplifier circuit, audio processing circuit and control circuit. It is composed of chi.

(E) Operation The present invention is designed to perform the power supply operation to the amplifier circuit, the audio processing circuit and the control circuit incorporated in the main body through the power switch and the power line provided in the memory container. .

(F) Embodiment The illustrated circuit is an embodiment of the present invention, in which ( 1 ) is a main body, and ( 2 ) is a memory container which is detachable from the main body ( 1 ). (3) is a microphone that is in an operating state during recording operation and that converts an acoustic signal into an electric signal, and (4) is input with a recording signal that is converted into an electric signal by the microphone (3) and amplifies the signal It is an amplifier circuit for recording. Reference numeral (5) is a voice signal which is an analog signal which is an analog signal output from the recording amplifying circuit (4) during a recording operation and a digital signal which is read from a memory which will be described later during a reproduction operation. This is a voice processing circuit for converting into a signal, and for example, an LSI "MSM6258" manufactured by Oki Electric Industry Co., Ltd. may be used, and its details are omitted. (6) is a reproduction amplifier circuit which receives the reproduction signal converted into the audio signal by the audio processing circuit (5) and amplifies the signal.
(7) is a speaker to which the signal amplified by the reproduction amplifying circuit (6) is applied and which emits the signal. (8) is incorporated in the memory container ( 2 ), and the voice signal converted into a digital signal by the voice processing circuit (5) and index data indicating the recording end position of the memory are written. a semiconductor memory RAM, (9) is a battery backup that is built into the memory for the container (2) in the RAM when said memory for container (2) is not attached to the main body (1)
It has a function of holding the memory operation of (8). (Ten)
Is a capacitor connected in parallel to the backup battery (9) and has a function of holding the storage operation of the RAM (8) when the backup battery (9) is replaced, for example. (11), (12) and (13)
Is a first power supply terminal, a second power supply terminal and an installation terminal provided in the memory container ( 2 ), and the first power supply terminal (11) and the second power supply terminal (12) are connected to each other by a power supply line (1
4) and the power supply terminal of the RAM (8), and the ground terminal (13) is grounded. Reference numeral (15) is a control circuit for controlling the voice processing operation of the voice processing circuit (5) and the write / read operation of the RAM (8), which is connected to the voice processing circuit (5) by a data bus (16). Along with this, when the memory container ( 2 ) is attached to the main body ( 1 ), it is connected to the RAM (8) by the data bus (17). (1
Reference numeral 8) is a recording operation switch which is pressed and closed by a recording operation. When the recording operation switch (18) is closed, an operation of storing a voice signal in the RAM (8) is performed. Reference numeral (19) is a reproduction operation switch which is pressed and closed by a reproduction operation, and when the reproduction operation switch (19) is closed, a signal stored in the RAM (8) is read out and reproduced. Be done. (20), (21), and (22) are a fast-forward operation switch, a rewind operation switch, and a stop operation switch that are pressed and closed during fast-forward operation, rewind operation, and stop operation. In such a configuration, the audio signal is stored in the RAM (8) by the recording operation, and at this time, the first data indicating the maximum recording end position, that is, the maximum use position of the memory is provided in the RAM (8). The first data is written in the memory section and is not erased until the erase operation is performed. When the recording operation is further performed from the maximum recording end position of the memory, new first data is written in the index memory section. Then, when the reproducing operation, the fast-forwarding operation and the rewinding operation are performed, the second data indicating the current position where the reading operation of the memory is performed is written in the index memory section provided in the RAM (8). Is configured. (23) is an erasing operation switch, which is configured to erase the signal stored in the RAM (8) by performing a rewinding operation by pressing the rewinding operation switch (21) at the same time. ing. (2
4) is a clock / display drive circuit incorporating a clock circuit and a drive circuit for driving the display (25), and (26) is for display selection for selectively switching the contents displayed on the display (25). It is a switch, and an indicator (2
It has the effect of switching the contents displayed in 5) in the order of clock display → counter display → remaining time display → consumption time display → clock display. Reference numeral (27) is a correction / reset operation switch that acts as a time adjustment switch when in the clock display state and as a reset switch when in the counter display state. (28) is a battery incorporated in the main body ( 1 ) of the audio recording / playback device,
(29) is a first power supply terminal provided on the main body ( 1 ) while the voltage from the battery (28) is applied,
When the memory container ( 2 ) is attached to the main body ( 1 ), the memory container ( 2 ) is connected to the first power supply terminal (11) provided in the container ( 2 ). (30) and (31) is a second power supply terminal and a ground terminal provided in the main body (1), said vessel when said memory container (2) is attached to the main body (1) ( 2 ) provided in 2 )
It is configured to be connected to the power supply terminal (12) and the ground terminal (13). Reference numeral (32) is a power switch provided in the main body ( 1 ), which is a common terminal (a) connected to the second power supply terminal (30) and the common terminal (a) when in a power supply operation state. ) And a power supply terminal provided in the recording amplification circuit (4), the audio processing circuit (5), the reproduction amplification circuit (6) and the control circuit (15). It is provided with a terminal (b) and a second terminal (c) connected to the common terminal (a) when the power is cut off. Also, clock and display drive circuit (24)
The display (25) is configured to be supplied with power from the battery (28) regardless of the opening / closing operation of the power switch (32) to perform the time display operation.

The present invention is configured as described above, and the operation will be described below. When the memory container (2) is attached to the main body (1) the first power supply terminal provided on the main body (1) (2
9), the second power supply terminal (30) and the ground terminal (31), and the first power supply terminal (1) provided on the memory container ( 2 ).
1), the second power supply terminal (12) and the ground terminal (13) are respectively connected, and the RAM (8) and the control circuit (15) are connected by the data bus (17) to be in the illustrated state. In such a state, power is supplied from the battery (28) to the clock / display drive circuit (24) and the display (25), so that the time is displayed on the display (25) and the first time is displayed. RAM via the power supply terminal (29) and the first power supply terminal (11)
Since the power is supplied to (8), the RAM (8) becomes operable. Also, since the power switch (32) is opened, power is not supplied to the recording amplification circuit (4), the audio processing circuit (5), the reproduction amplification circuit (6) and the control circuit (15). None, each circuit is inactive. When the power switch (32) is switched to the closed state in such a state, the power source from the battery (28) is the first power supply terminal (29) -first power terminal (11) -power line (14).
-Second power terminal (12) -Second power supply terminal (30) -Power switch (32) through the amplifier circuit for recording (4), the audio processing circuit (5), the amplifier circuit for reproduction (6) and the contact circuit Power is supplied to (15). When a recording operation is performed in such a state, the recording operation switch (18) is closed, and the control circuit (15) is in a state of performing a control operation for the recording operation. The recording signal converted into an electric signal by the microphone (3) is input to the recording amplification circuit (4) and amplified, and then input to the voice processing circuit (5). The signal input to the voice processing circuit (5) is digitally processed by dividing it into short-time phrases by a method called ADPCM, that is, adaptive differential pulse code modulation, and stored in the RAM (8) by the function of the control circuit (15). Written. In this way R
The recording operation of the audio signal is performed at AM (8), but the recording operation is canceled when the memory capacity is exhausted or the stop operation is performed. In addition, while recording is in progress, RAM
Since the first data is written in the index memory section provided in (8), when the recording operation is canceled by the stop operation, the first data indicating the maximum recording end position, that is, the maximum use position of the memory is the RAM (8 ) Is written in. The recording operation is performed in this manner, and the reproducing operation will be described next. When the reproducing operation is performed, the reproducing operation switch (19) is closed, and the control circuit (15) is in a state of performing the control operation for the reproducing operation. In such a reproducing operation state, the reading operation of the signal of each phrase stored in the RAM (8) is performed, but the second data indicating the current use position of the memory is not written in the RAM (8). In this case, the read operation is performed from the beginning of the memory. The signal read from the RAM (8) is input to the audio processing circuit (5) and converted into an analog audio signal. The signal converted into the audio signal by the audio processing circuit (5) is input to the reproduction amplifier circuit (6), amplified, and then emitted by the speaker (7). When the reproducing operation is being performed, the second data indicating the current position is written in the index memory section provided in the RAM (8). Therefore, when the reproduction operation is canceled by the stop operation and then the reproduction operation is performed again in the reproduction operation state, the read operation is started from the position based on the second data, so that the continuation of the sound reproduced last time is reproduced. become.

The recording operation and the reproducing operation are performed as described above. Next, the operation when the fast-forward operation and the rewind operation are performed will be described. When the fast forward operation is performed, the fast forward operation switch (20) is closed and the control circuit (15) is in a state of performing the control operation for the fast forward operation. In such a fast-forward operation state, the operation of reading the signal from the RAM (8) is performed while skipping a predetermined number of phrases, and as a result, the read / play operation is faster than the above-described playback operation, so that the fast-forward operation is Will be done. Further, when the rewinding operation is performed, the control circuit (15) is in a state of performing the control operation for the rewinding operation. RAM in such a rewinding operation state
The signal reading operation from (8) is performed in the opposite direction while skipping a predetermined number of phrases. RAM by performing the fast forward operation and rewind operation described above.
It is possible to find the signal recorded in (8), but when such an operation is being performed, the second data indicating the current position is written in the index memory section as in the reproducing operation described above. It will be different. Therefore, if the fast-forwarding or rewinding operation is performed again after returning to the stopped state, the fast-forwarding operation or the rewinding operation is started from the position based on the above-mentioned second data.

The recording, reproducing, fast-forwarding and rewinding operations are performed as described above. Next, the erasing operation will be described. Since such an erasing operation is performed by pressing and closing the rewinding operation switch (21) and the erasing operation switch (23) at the same time, after reproducing to the position of the above-mentioned first data, that is, the maximum memory use position. If such erase operation is performed, RAM
The voice signal stored in (8) can be deleted. Although the erase operation is performed in this manner, when the erase operation is performed, the first data and the second data written in the index memory unit provided in the RAM (8)
The data will also be erased.

As described above, each operation such as recording and reproduction in this embodiment is performed. When such an operation is performed, an operation of supplying operating power to the RAM (8) incorporated in the memory container ( 2 ) Is carried out from the battery (28) incorporated in the main body ( 1 ) through the first power supply terminal (29) and the first power supply terminal (11). Therefore, consumption of the backup battery (9) incorporated in the memory container ( 2 ) can be suppressed.

The operation of this embodiment is performed as described above. Next, the display operation of the display (25) will be described. Display (25) by operating the display selection switch (26)
The display content displayed on changes in the order of clock display → counter display → remaining time display → consumption time display → clock display.
Then, during the counter display operation, the count operation is performed based on the signal output accompanying the write operation to the RAM (8) and the read operation from the RAM (8). The remaining time display operation and the consumption time display operation are performed based on the first data and the second data written in the index memory section provided in the RAM (8).

The respective operations in this embodiment are performed as described above. Next, the operation when the memory container ( 2 ) is removed from the main body ( 1 ) will be described. When the memory container ( 2 ) is removed from the main body ( 1 ), the power supply from the battery (28) to the RAM (8) is cut off, but the backup battery (9) incorporated in the container ( 2 ) is cut off. ), The power is supplied to the RAM (8), so that the audio signal, the first data and the second data stored in the RAM (8) are not erased but are stored and retained. Such a state, that is, a memory container ( 2 )
Power switch (3 but when not attached to the main body (1)
Even if 2) is closed, power is not supplied from the battery (28) to the common terminal (a) of the switch (32), so the recording amplification circuit (4), audio processing circuit (5), reproduction amplification circuit Power is not supplied to the circuit (6) and the control circuit (15). Therefore, if the power supply switch (32) is accidentally closed when the memory container ( 2 ) is not installed, or if the memory container ( 2 ) is removed during operations such as regeneration, the battery ( 28) It is possible to prevent wasteful consumption.

(G) Effect of the invention The power supply control circuit of the invention converts a recording signal obtained from the microphone during a recording operation into a digital signal, and is a semiconductor incorporated in a memory container which is detachable from the main body. In a voice recording / reproducing apparatus configured to store in a memory circuit and read a signal stored in the semiconductor memory circuit at the time of reproduction operation, convert the signal into an analog signal, and emit the sound through a speaker. An amplifier circuit built into the body from a battery
Since the power supply operation to the voice processing circuit and the control circuit is performed through the power supply terminal provided in the memory container, that is, the memory container is used, the memory container is used as a main body. The present invention has an effect that power is not supplied to each of the circuits even when the power switch is closed when the power switch is not attached to the circuit, so that wasteful consumption of the power can be prevented.

[Brief description of drawings]

The circuit shown is an embodiment of the power supply control circuit of the present invention. Description of main drawing numbers ( 1 ) …… Main body, ( 2 ) …… Memory container, (3) ……
Microphone, (4) ... Amplification circuit for recording, (5) ...
… Sound processing circuit, (6) …… Amplification circuit for reproduction, (7)…
… Speaker, (8) …… RAM, (9) …… Battery for backup, (11) …… First power supply terminal, (12) …… Second power supply terminal, (13) (31) …… Grounding terminal, (14) …… Power supply line, (15) …… Control circuit, (24) …… Clock and display drive circuit, (25) …… Display, (28) …… Battery, (29) …… First power supply Supply terminal, (30) …… Second power supply terminal, (32)
...... Power switch.

Claims (1)

[Scope of utility model registration request] 1. A recording signal obtained from a microphone during a recording operation is converted into a digital signal and stored in a semiconductor memory circuit which can be attached to and detached from a main body, and a signal stored in the semiconductor memory circuit during a reproducing operation is recorded. In a voice recording / reproducing apparatus configured to read out, convert to an analog signal, and emit the sound through a speaker, an amplifier circuit that is incorporated in the main body and amplifies the audio signal, and an audio circuit that is incorporated in the main body A voice processing circuit for converting the digital signal into a digital signal and a digital signal into a voice signal, and a conversion operation by the voice processing circuit incorporated in the main body, a writing operation to the semiconductor memory circuit, and the semiconductor A control circuit that controls the read operation of the signals stored in the memory circuit, and is removable from the main unit A memory container having a built-in semiconductor memory circuit and a backup battery for performing a backup operation of a signal stored in the semiconductor memory circuit; and a memory container provided in the memory container and attached to the main body. A first power supply terminal and a second power supply terminal, which are respectively connected to the first power supply terminal and the second power supply terminal provided on the main body when in the opened state,
A battery incorporated in the main body and supplying power to the first power supply terminal; a power supply terminal for the amplifier circuit, the audio processing circuit and the control circuit provided in the main body and the second power supply; A power switch connected between the semiconductor memory and the semiconductor memory via the first power supply terminal and the first power terminal when the memory container is attached to the main body. Power is supplied to the circuit and power is supplied from the battery to the amplifier circuit, the audio processing circuit and the control circuit through the first power supply terminal, the first power supply terminal, the second power supply terminal, the second power supply terminal and the power switch. A power supply control circuit for a voice recording / reproducing apparatus, characterized in that