JP2686091B2 - Cordless answering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A cordless answering machine that improves the convenience of an answering machine when the user is at home, and an answering machine while the user is at home without compromising the economy of the answering machine. In an answering machine equipped with an IC memory, a recording analog-digital converter, and a playback digital-analog converter for the purpose of enabling communication at any position away from the telephone, the answering machine is called an IC memory. Telephone body with built-in analog-digital converter for recording and digital-analog converter for playback, receiver (81) and transmitter (82)
And a transmitter / receiver having a built-in, and a first transmitting means for modulating the optical carrier with a voice signal digitally encoded by a recording analog-digital converter in the telephone body, and transmitting through space. The first receiving means for receiving the optical carrier modulated by the digitally encoded voice signal transmitted through the space and demodulating it into the digitally encoded voice signal and the hook switch set to the off-hook state In this case, the output terminal of the recording analog-digital converter is switched from the writing terminal of the IC memory to the first transmitting means, and the input terminal of the reproducing digital-analog converter is changed from the reading terminal of the IC memory to the first receiving means. When switching and setting the hook switch to the on-hook state, the output terminal of the analog-to-digital converter for recording is changed from the first transmitting means. A switching means is provided for switching to the writing terminal of the IC memory and for switching the input terminal of the reproducing digital-analog converter from the first receiving means to the reading terminal of the IC memory, and is transmitted to the handset via the space. By the second receiving means for receiving the optical carrier wave modulated by the digitally encoded voice signal and demodulating it into the digitally encoded voice signal, and the recording analog-digital converter output from the second receiving means. A second digital-to-analog converter that converts the digitally encoded voice signal into an analog-type voice signal and inputs it to the receiver, and the analog-type voice signal output from the transmitter to the playback digital-analog converter A second analog-digital converter that encodes a reproducible digital code by
A second transmitting means for modulating an optical carrier with a digitally encoded audio signal output from the second analog-digital converter and transmitting the modulated optical carrier through space is provided.

[Industrial applications]

The present invention relates to an answering machine using an IC memory, and more particularly to a cordless answering machine that improves the convenience of the answering machine when the user is at home.

[Conventional technology]

FIG. 5 is a diagram showing an example of a conventional answering machine.

In FIG. 5, 1 and 4 are hook switches that operate in the off-hook state where the handset is raised while the handset is in the on-hook state, and 2 is when the call is received in the answering machine state. Transistor 3 for automatically answering the call, 3 receives a ringing signal and rings the speaker 5, an incoming ringer circuit 6 sends a called telephone number when making a call, and 7 sends and receives to a user. A call circuit that enables a call with the interlocutor via the device 8, when an incoming call is received in the answering machine, the analog voice signal transmitted by the caller is converted into a digital code and recorded from the writing terminal of the IC memory 11. An analog-to-digital converter (hereinafter referred to as A / D converter) 10 is a digital code reproduced from the read terminal of the IC memory 11 when the user reproduces and listens to the recorded voice signal. Digital-to-analog converter (hereinafter D / A) that converts the encoded audio signal to analog format.
A converter).

[Problems to be solved by the invention]

As is apparent from the above description, in the conventional answering machine, the user makes a call through the handset 8 which is connected to the call circuit 7 by wire while at home, so that the handset 8 is used as an answering machine. I could only make calls within the range of the cord length to connect.

On the other hand, A / D converter 9, D / A converter 10 and IC memory 11
Is used only when the user is in the answering machine, and is not used when the user is at home.

The present invention, without impairing the economical efficiency of the answering machine,
The purpose of the present invention is to allow a user to talk at a free position away from an answering machine while at home.

[Means for solving the problem]

 FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 30 is a telephone body and 8 is a handset, which are separated.

11 is an IC memory, 100 is an analog-digital converter for recording, 200 is a digital-analog converter for reproduction, which are provided in the telephone body 30, 31 is a receiver, 82 is a transmitter / receiver.
It is provided within.

Reference numeral 300 is a first transmitting means provided in the telephone body 30 according to the present invention.

Reference numeral 400 is a first receiving means provided in the telephone body 30 according to the present invention.

Reference numeral 500 is a switching means provided in the telephone body 30 according to the present invention.

600 is a second receiving means provided in the handset 8 according to the present invention.

700 is a second digital-to-analog converter provided in the handset 8 according to the present invention.

800 is a second analog-digital converter provided in the handset 8 according to the present invention.

900 is the second transmitting means provided in the handset 8 according to the present invention.

[Action]

The first transmitting means 300 modulates an optical carrier with a voice signal digitally encoded by the recording analog-digital converter 100, and transmits it via space.

The first receiving means 400 receives the optical carrier modulated by the digitally encoded voice signal transmitted through the space and demodulates it into the digitally encoded voice signal.

When the hook switch is set to the off-hook state,
The output terminal of the recording analog-digital converter 100 is switched from the writing terminal of the IC memory 11 to the first transmitting means 300, and the input terminal of the reproducing digital-analog converter 200 is first received from the reading terminal of the IC memory 11. When switching to the means 400 and setting the hook switch to the on-hook state, the output terminal of the recording analog-digital converter 100 is switched from the first transmitting means 300 to the writing terminal of the IC memory 11, and the reproduction digital-analog conversion is performed. Bowl 20
The input terminal of 0 is switched from the first receiving means 400 to the reading terminal of the IC memory 11. The second receiving means 600 is an optical carrier modulated by a digitally encoded audio signal transmitted via space. It is received and demodulated into a digitally encoded voice signal.

The second digital-analog converter 700 converts the audio signal digitally encoded by the recording analog-digital converter 100 output from the second receiving means 600 into an analog audio signal, and inputs the analog audio signal to the receiver 81. .

The second analog-digital converter 800 encodes the analog audio signal output from the transmitter 82 into a digital code that can be reproduced by the reproduction digital-analog converter 200.

The second transmitting means 900 modulates the optical carrier wave with the digitally encoded audio signal output from the second analog-digital converter 800, and transmits it via the space.

Therefore, the handset is not connected to the main body of the telephone with a wired cord, the user can talk at any position away from the main body of the telephone, the user lowers the handset and sets the hook switch to the on-hook state. Then, the recording analog-digital converter and the reproduction digital-analog converter are immediately reconnected for recording and reproduction of the IC memory, and no special operation is required to return to the answering machine function. The digitally encoded audio signal that modulates the optical carrier wave transmitted from the telephone body to the space is encoded by the analog-to-digital converter for recording that was not used while the user was at home, and transmitted from the space. Since the digitally encoded voice signal demodulated from the carrier wave is decoded by the digital analog converter for reproduction which is not used while the user is at home, it can be realized without impairing the economical efficiency.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Second
FIG. 3 is a diagram showing a cordless answering machine according to an embodiment of the present invention, and FIG. 3 is a diagram showing an infrared voice pulse train in FIG. The same reference numerals indicate the same objects throughout the drawings.

In FIG. 2, an infrared light emitter 12 and a driver 13 as the first transmitting means 300 in FIG. 1 and an infrared light receiver 14 and a receiver as the first receiving means 400 in FIG. 15 and gates
16, and hook switches 17 and 18 are provided as the switching means 500 in FIG.

In the handset 8, the second receiving means in FIG.
The infrared light receiver 83, the sneaking gate 810, the receiver 85, and the PLL circuit 86 as 600, the D / A converter 84 as the second digital-analog converter 700 in FIG. 1, and the second in FIG. Analog-to-digital converter 800
Is provided with an A / D converter 88, and an infrared light emitter 87 and a driver 89 are provided as second transmitting means 900 in FIG. That is, infrared rays are used as a carrier wave that the telephone body 30 and the handset 8 transmit and receive via space.

In the on-hook state in which the handset 8 is lowered, the hook switches 1, 4, 17 and 18 are all in the restored state (state shown in the figure), and the answering machine sends the message of the caller in the same manner as in FIG. It is possible to record in IC memory 11,
The user can also reproduce the voice signal recorded in the IC memory 11.

On the other hand, in the off-hook state in which the user is at home and the handset 8 is raised, the hook switches 1, 4, 17, and 18 are all in the operating state.

In such a state, the analog-type received voice signal transmitted by the interlocutor is transmitted via the communication circuit 7 to the A / D converter 9
After being converted into a digital code by the A / D converter 9, the signal is transmitted to the driver 13 and the sneak-in prohibition gate 16 via the hook switch 17 in the operating state.

The driver 13 uses the digitally encoded reception voice signal transmitted from the A / D converter 9 to transmit the infrared light emitted by the infrared light emitter 12 in a predetermined period T as shown in FIG.
Modulate intermittently with.

The wraparound prohibition gate 16 is in a cutoff state in synchronization with the cycle T while the digitally encoded reception voice signal is transmitted from the A / D converter 9.

In the handset 8, the infrared receiver 83 is the telephone body 30.
The infrared light emitted from the infrared light emitter 12 in the inside is received through the space, and the receiver 85 is passed through the sneak-proof gate 810.
To communicate.

The receiver 85 demodulates the infrared light received by the infrared light receiver 83 and outputs the obtained digitally encoded received voice signal.
It is transmitted to the D / A converter 84 and the PLL circuit 86.

The PLL circuit 86 extracts a period T in which the digitally encoded received voice signal is transmitted from the receiver 85, transmits it to the D / A converter 84, and also has a period T having a phase difference of about 1/2 period from the period T. ′ Is the A / D converter 88 and the wraparound prohibition gate 8
Communicate to 10.

The wraparound prohibition gate 810 is turned off in synchronization with the cycle T ′ transmitted from the PLL circuit 86.

The D / A converter 84 converts the digitally encoded reception voice signal transmitted from the receiver 85 into an analog form in synchronization with the cycle T transmitted from the PLL circuit 86, and inputs the analog reception voice signal to the reception unit 81.

The receiver 81 converts the analog reception voice signal input from the D / A converter 84 into an acoustic signal and outputs it.

As a result, the user can hear the received voice output from the receiver 81, that is, the transmitted voice of the interlocutor.

On the other hand, the transmitted voice of the user is converted into an analog transmitted voice signal by the transmitter 82 and transmitted to the A / D converter 88.

The A / D converter 88 converts the analog transmission voice signal transmitted from the transmitter 82 into a digital code in synchronization with the period T ′ transmitted from the PLL circuit 86, and transmits it to the driver 89. .

The driver 89 intermittently modulates the infrared light emitted by the infrared light emitter 87 in space by the digitally encoded transmission voice signal transmitted from the A / D converter 88 at a cycle T'as shown in FIG. To do.

In the telephone body 30, the infrared receiver 14 is the handset 8
Infrared light emitted from the infrared light emitting device 87 is received through the space and transmitted to the receiver 15.

The receiver 15 demodulates the infrared light received by the infrared light receiver 14, and the digitally encoded transmission voice signal obtained is in operation with the circumvention prohibition gate 16 which is conductive in the period T '. D / via hook switch 18
It is transmitted to the A converter 10.

The D / A converter 10 converts the digitally encoded transmission voice signal transmitted from the receiver 15 into an analog format,
It is transmitted to the interlocutor via the call circuit 7.

The infrared light receiver 14 also receives the infrared light emitted by the infrared light emitter 12 in synchronization with the cycle T, but has a gate for preventing wraparound.
Since 16 is in the cutoff state in synchronization with the cycle T, the digitally encoded transmission voice signal output by the receiver 15 is output.
Transmission to the D / A converter 10 is prevented.

In addition, the infrared receiver 83 also receives the period T'from the infrared emitter 87.
Although the infrared ray which is emitted in synchronization with is also received, the circumvention prohibition gate 810 is in the shut-off state in synchronization with the cycle T ', so that the receiver 85 converts the digitally encoded received voice signal into a D / A converter. Transmission to 84 is prevented.

As is clear from the above description, according to the present embodiment, the telephone main body 30 and the handset 8 are connected by the infrared rays propagating through the space, and are not connected in a wired manner by a cord or the like. It is possible to talk at any position apart from the telephone body 30.

Further, in the telephone body 30, only the infrared light emitter 12, the driver 13, the infrared light receiver 14, the receiver 15 and the turn-around gate 16 are added, and the A / D converter 9 and the D / A converter are added.
10 is also used for recording and reproducing to the IC memory 11 when it is not needed, so that it is also economical.

Note that FIG. 2 is merely an embodiment of the present invention until now, for example, the A / D converter 9 and the D / A converter 10 in the telephone main body 30,
The D / A converter 84 and the A / D converter 88 in the handset 8 are not limited to those provided separately, and the fourth
Many other modifications can be considered as illustrated in the drawing, but the effect of the present invention does not change in any case.

FIG. 4 is a diagram showing an answering machine according to another embodiment of the present invention.

In FIG. 4, inside the telephone main body 30 in FIG.
An A / D / D / A converter 19 and a mode switch 20 are provided in place of the A / D converter 9 and the D / A converter 10, and the D / A converter 84 and A / in the handset 8 are provided. Instead of the D converter 88, an A / D / D / A converter 811 and a voice detection circuit 812 are provided.

In FIG. 4, the mode switch 20 in the telephone body 30
Sets the A / D / D / A converter 19 to the A / D conversion mode in a state where the digitally encoded transmission voice signal is not transmitted from the receiver 15 and is transmitted via the communication circuit 7. The received voice signal in the analog format is converted into a digital code and transmitted to the driver 13 via the hook switch 17, but when the digitally encoded transmission voice signal is transmitted from the receiver 15, A / D. The D / A converter 19 is set to the D / A conversion mode, and the digitally encoded transmission voice signal transmitted from the receiver 15 via the hook switch 18 is converted into an analog format, and then transmitted via the communication circuit 7. Let the interlocutor communicate.

In addition, the voice detection circuit 812 in the handset 8 receives the A / A signal when the analog transmission voice signal is not transmitted from the transmitter 82.
Set the D / D converter 811 to A / D conversion mode and
The digitally encoded reception voice signal transmitted from the device is converted to an analog format and transmitted to the receiver 81.When the analog transmission voice signal is transmitted from the transmitter 82, the A / D. The D / A converter 811 is set to the D / A conversion mode, the analog transmission voice signal transmitted from the transmitter 82 via the voice detection circuit 812 is digitally encoded, and the driver 89
The infrared light is emitted by the infrared light emitter 87.

Further, the optical carrier wave propagating between the telephone body 30 and the handset 8 is not limited to infrared rays, and many other modifications such as using visible light may be considered. The effect of the invention does not change.

Further, the optical carrier wave transmitted from the infrared light emitter 12 in the telephone body 30 and the optical carrier wave sent from the infrared light emitter 87 in the handset 8 have periods T and T'having different phases by about 1/2 cycle.
It is not limited to the time-division format, and many other modifications can be considered, such as the frequency-division format that uses optical carriers with different frequencies. The effect of the invention does not change.

〔The invention's effect〕

As described above, according to the present invention, in the answering machine,
The handset is not connected to the telephone body with a wired cord, the user can talk at a free position away from the telephone body, and when the user lowers the handset and sets the hook switch to the on-hook state, The recording analog-digital converter and the reproduction digital-analog converter are immediately reconnected for recording and reproduction in the IC memory, and no special operation is required to return to the answering machine function. In addition, the digitally encoded voice signal that modulates the optical carrier wave transmitted from the telephone body to the space is
Digitally encoded audio signals encoded by an analog-to-digital converter for recording that were not used while the user was at home and demodulated from an optical carrier transmitted from space were used while the user was at home. Since it is decoded by the digital analog converter for reproduction which is not performed, it can be realized without impairing the economical efficiency.

[Brief description of the drawings]

1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an answering machine according to an embodiment of the present invention, FIG. 3 is a diagram illustrating an infrared voice pulse train in FIG. 2, and FIG. 4 is a book. FIG. 5 is a diagram showing an answering machine according to another embodiment of the invention, and FIG. 5 is a diagram showing an example of a conventional answering machine. In the figure, 1, 4, 17 and 18 are hook switches, 2
Is a transistor, 3 is an incoming ringer circuit, 5 is a speaker,
6 is a dial transmission circuit, 7 is a communication circuit, 8 is a handset, and 9
And 88 are A / D converters, 10 and 84 are D / A converters, 11 is IC
Memory, 12 and 87 are infrared ray emitters, 13 and 89 are drivers, 14 and 83 are infrared ray receivers, 15 is receiver, 16 and 810 are shunt gates, 19 and 811 are A / D / D / A converters , 20 is a mode switcher, 30 is a telephone body, 81 is a receiver, 82 is a transmitter, 100 is an analog-digital converter for recording, 200 is a digital-analog converter for reproduction, 300 is a first transmitting means, and 400 is First receiving means, 500 is switching means, 60
Reference numeral 0 represents a second receiving means, 700 represents a second digital-analog converter, 800 represents a second analog-digital converter, 900 represents a second transmitting means, and 812 represents a voice detection circuit.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shinichi Inoue 2-18-2 Nishigotanda, Shinagawa-ku, Tokyo Inside Hasegawa Electric Co., Ltd. (72) Inventor Masaya Iguchi 2-18-2 Nishigotanda, Shinagawa-ku, Tokyo No. 2 Hasegawa Electric Co., Ltd. (56) Reference JP-A-58-173923 (JP, A) JP-A-61-123349 (JP, A)

Claims (1)

(57) [Claims] 1. An answering machine comprising an IC memory (11), a recording analog-digital converter (100) and a reproducing digital-analog converter (200), wherein the answering machine is the IC memory (11). ), A recording analog-digital converter (100), and a playback digital-analog converter (200), the telephone body (30),
Handset (8) with built-in handset (81) and transmitter (82)
A first transmitting means for separating an optical carrier into the telephone main body (30) by a voice signal digitally encoded by the recording analog-digital converter (100) and transmitting it through space. (300)
A first receiving means (400) for receiving an optical carrier modulated by a digitally encoded audio signal transmitted through the space and demodulating the optical carrier into the digitally encoded audio signal; When the switch is set to the off-hook state, the output terminal of the recording analog-digital converter (100) is switched from the writing terminal of the IC memory (11) to the first transmitting means (300) and the reproducing terminal is used. Connect the input terminal of the digital-analog converter (200) to the IC memory (1
When the read terminal of 1) is switched to the first receiving means (400) and the hook switch is set to the on-hook state, the recording analog-digital converter (10
0) output terminal from the first transmitting means (300) to the IC
Switching means (500) for switching to the writing terminal of the memory (11) and for switching the input terminal of the reproducing digital-analog converter (200) from the first receiving means (400) to the reading terminal of the IC memory (11). And an optical carrier modulated by a digitally encoded voice signal transmitted through the space is received by the handset (8) and demodulated into the digitally encoded voice signal. The second receiving means (600) and the audio signal digitally encoded by the recording analog-digital converter (100) output from the second receiving means (600) are converted into analog format audio signals. ,
A second digital-to-analog converter (700) input to the receiver (81) and an analog audio signal output from the transmitter (82) are reproduced by the reproducing digital-analog converter (200). A second analog-digital converter (800) for encoding into a possible digital code, and an optical carrier is modulated by a digitally encoded voice signal output from the second analog-digital converter (800), A cordless answering machine, characterized by being provided with a second transmitting means (900) for transmitting via space.