JPH01231553A - Cordless automatic answering telephone set - Google Patents

Abstract

PURPOSE:To realize calls at a free position distant from an automatic answering telephone set by using a 2nd transmission means which modulates the carrier waves by means of the digitally coded sound signal received from a 2nd A/D converter and transmits these modulated carrier waves via a space. CONSTITUTION:A 2nd reception means 600 receives the carrier wave which is modulated by the digitally coded sound signal received via a space and demodulates said carrier wave into the digitally coded voice signal. A 2nd D/C converter 700 converts the output digitally coded sound signal into an analog sound signal and supplies it to a telephone receiver 81. A 2nd A/D converter 800 converts the output analog sound signal into a digitally coded sound signal. Furthermore a 2nd transmission means 900 modulates the carrier wave by the output digitally coded sound signal and transmits the modulated carrier wave via a space. In such a constitution, a handset is not connected to the main body of a telephone set via any code and therefore a user can call at a free position distant from the telephone set.

Description

[Detailed Description of the Invention] [Summary] Regarding a cordless answering machine that improves the convenience of an answering machine when the user is at home, it is possible to use the answering machine while the user is at home without sacrificing the economic efficiency of the answering machine. In an answering machine that is equipped with an IC memory, an analog-to-digital converter for recording, and a digital-to-analog converter for playback, the purpose of which is to enable calls from a free location away from the telephone, the answering machine is connected to the telephone itself. The handset is separated from the handset, and the telephone body includes a first transmitting means that modulates a carrier wave with a digitally encoded audio signal and transmits it via space, and a first transmitting means that modulates a carrier wave with a digitally encoded audio signal and transmits it via space. a first receiving means for receiving a carrier wave modulated by a digitally encoded audio signal and demodulating it into a digitally encoded audio signal; Switch from the memory write terminal to the first transmission means,
A switching means is provided for switching the input terminal of the digital-to-analog converter for reproduction from the reading terminal of the IC memory to the first receiving means, and the transceiver is modulated by a digitally encoded audio signal transmitted via space. a second receiving means for receiving the digitally encoded carrier wave and demodulating it into a digitally encoded audio signal; converting the digitally encoded audio signal outputted from the second receiving means into an analog format audio signal; a second digital-to-analog converter input to the handset; a second analog-to-digital converter to digital-encode the analog audio signal output from the transmitter; modulates the carrier wave with a digitally encoded audio signal,
and a second transmitting means for transmitting via space.

[Industrial application field]

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 Figure 5, ■ and 4 are hook switches that operate in the on-hook state (shown) with the handset lowered, and hook switches that operate in the off-hook state with the handset raised; Transistor 3 automatically responds to the call signal, and speaker 5
6 is a dial sending circuit that sends out the called telephone number when making a call, 7 is a communication circuit that allows the user to talk to the interlocutor via handset 8, and 9 is an answering machine. When a call arrives, the analog voice signal sent by the caller is converted into a digital code and stored in the IC memory 11.
An analog-to-digital converter (hereinafter referred to as an A/D converter) records data from the write terminal of the IC memory 11, and 10 represents a digital code reproduced from the read terminal of the IC memory 11 when the user plays back and listens to the recorded audio signal. This is a digital-to-analog converter (hereinafter referred to as a D/A converter) that converts the encoded audio signal into an analog format.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in conventional answering machines, the user makes calls via the handset 8 wired to the telephone call circuit 7 when the user is at home. It was only possible to make calls within the range of the connected cord length.

On the other hand, the A/D converter 9, the D/A converter 10, and the IC memory 11 are used only when the user is away from home, and are not used when the user is at home.

SUMMARY OF THE INVENTION An object of the present invention is to enable a user to make a call at a free location away from an answering machine while at home, without impairing the economic efficiency of the answering machine.

[Means for solving problems]

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

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

11 is an IC memory, 100 is an analog-to-digital converter for recording, 200 is a digital-to-analog converter for playback, which is provided in the telephone body 30, 81 is a receiver, and 82 is a transmitter, which is provided in the handset 8. .

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

Reference numeral 400 denotes first receiving means provided within the telephone main body 30 according to the present invention.

Reference numeral 500 denotes a switching means provided within the telephone main 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-to-digital converter provided in the handset 8 according to the present invention.

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

[Effect]

The first transmitting means 300 modulates a carrier wave with a digitally encoded audio signal and transmits it via space.

The first receiving means 400 receives a carrier wave modulated by a digitally encoded audio signal transmitted via space, and demodulates it into a digitally encoded audio signal.

When the footer switch is in the off-hook state, the switching means 500 switches the output terminal of the recording analog-to-digital converter 100 from the write terminal of the IC memory 11 to the first transmission means 300, and switches the output terminal of the recording analog-to-digital converter 100 from the write terminal of the IC memory 11 to the first transmitting means 300, The input terminal is switched from the read terminal of the IC memory 11 to the first receiving means 400.

The second receiving means 600 receives a carrier wave modulated by a digitally encoded audio signal transmitted via space, and demodulates it into a digitally encoded audio signal.

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

The second analog-to-digital converter 800
Digitally encodes the analog audio signal output from the

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

Therefore, the handset and receiver are not connected to the telephone main body by a wired cord, and the user can talk at any position away from the telephone main body. Note that the digitally encoded voice signal that modulates the carrier wave transmitted from the telephone body into space is
Digitally encoded audio signals encoded by a recording analog-to-digital converter and demodulated from a carrier wave transmitted from space are not used while the user is at home. Since decoding is performed using a digital-to-analog converter for reproduction, which was not previously available, it can be realized without sacrificing economic efficiency.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a cordless answering machine according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating an infrared voice pulse train in FIG. 2. Note that the same reference numerals refer to the same objects throughout the plan.

In FIG. 2, an infrared emitter 12 and a driver 13 are included in the telephone body 30 as the first transmitting means 300 in FIG. 1, and the first receiving means 4 in FIG.
As shown in FIG.
A hook switch 17 and 1 day are provided as 0.

Also, inside the transmitter/receiver 8, there is a second receiving means 6 in FIG.
As 00, infrared receiver 83, no-entry gate 810
, the receiver 85 and the PLL circuit 86 are also connected to the first
A D/A converter 84 is used as the second digital-to-analog converter 700 in the figure, an A/D converter 88 is used as the second analog-to-digital converter 800 in FIG. As the means 900, an infrared light emitter 87 and a driver 89 are provided.

That is, infrared rays are used as carrier waves transmitted and received by the telephone main body 30 and the handset 8 via space.

In the on-footer state where the handset 8 is lowered,
Hook switches 1, 4, 17 and 18 are both in the recovery state (the state shown), the answering machine can record the caller's message in the IC memory 11 as in FIG. Audio signals recorded in the IC memory 11 can be played back.

On the other hand, when the user is at home and is in an off-hook state with the handset 8 raised, hook switches 1, 4, 17 and 18
Both become operational.

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

The driver I3 intermittently modulates the infrared rays emitted into space by the infrared emitter 12 at a predetermined period T as shown in FIG. 3 using the digitally encoded voice signal transmitted from the A/D converter 9.

The turn-in prohibition gate 16 is in a cut-off state in synchronization with the cycle T while the digitally encoded received voice signal is transmitted from the A/D converter 9.

In the handset 8, the infrared receiver 83 is connected to the telephone main body 3.
The infrared rays emitted from the infrared emitter 12 inside 0 are received through the space and transmitted to the receiver 85 via the anti-turnover gate 810.

The receiver 85 demodulates the infrared rays received by the infrared receiver 83 and transmits the obtained digitally encoded received voice signal to the D/A converter 84 and the PLI-circuit 86 .

The PLL circuit 86 extracts the period T in which the digitally encoded received voice signal is transmitted from the receiver 85,
While transmitting to the D/A converter 84, the period T is about 1/
The A/D converter 8
8 and the No Entry Prohibition Game 1-810.

The anti-rotation gate 810 enters the cutoff state in synchronization with the period T'' transmitted from the PLL circuit 86.

The D/A converter 84 converts the digitally encoded received voice signal transmitted from the receiver 85 into an analog format in synchronization with the period T transmitted from the PLL circuit 86,
input into the receiver 81.

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

As a result, the user can listen to the received voice output from the receiver 81, that is, the voice spoken by the interlocutor.

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

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

The driver 89 intermittently modulates the infrared rays emitted into space by the infrared emitter 87 at a period T' as shown in FIG. do.

In the telephone body 30 , the infrared receiver 14 receives infrared light emitted from the infrared emitter 87 in the handset 8 via space, and transmits it to the receiver 15 .

The receiver 15 demodulates the infrared rays received by the infrared receiver 14 and sends the resulting digitally encoded outgoing voice signal to the anti-circumvention gate 16 which is in a conductive state during period T' and which is in an operating state. The signal is transmitted to the D/A converter 10 via the hook switch 18.

The D/A converter 10 converts the digitally encoded outgoing voice signal transmitted from the receiver 15 into an analog format and transmits it to the interlocutor via the communication circuit 7.

Note that the infrared receiver 14 also receives the infrared light emitted by the infrared emitter 12 in synchronization with the cycle T, but since the entry prohibition gate 16 is in a cutoff state in synchronization with the cycle T, the receiver 15 does not output the infrared light. The transmission of digitally encoded outgoing audio signals to the D/A converter IO is prevented.

The infrared receiver 83 also receives a period T from the infrared emitter 87.
The infrared rays emitted in synchronization with T' are also received, but since the anti-infrared gate 810 is in a blocked state in synchronization with period T', the receiver 85 converts the digitally encoded received voice signal into a D/A. transmission to device 84 is prevented.

As is clear from the above description, according to this embodiment, the telephone main body 30 and the handset 8 are connected by infrared rays propagating in space, and are not connected by wire through a cord or the like. It becomes possible to talk at a free position away from the telephone main body 30.

Further, in the telephone body 30, only an infrared emitter 12, a driver 13, an infrared receiver 14, a receiver 15, and a no-turn gate 16 are added, and the A/D converter 9 and the D/A converter 10 are connected to the IC memory 11. It is also economical because it can be used for recording and playback when it is not needed.

Note that FIG. 2 is only one embodiment of the present invention, and for example, the A/D converter 9 and the D/A converter 10 in the telephone body 30, and the D/A converter 84 in the handset 8. and A
The /D converters 88 are not limited to being provided separately, and many other modifications may be considered as illustrated in FIG. 4, but the effects of the present invention remain the same in either case.

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

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

In FIG. 4, a mode switch 20 inside the telephone main body 30
is the A/D-D/A converter 19 when the digitally encoded outgoing voice signal is not transmitted from the receiver 15.
is set to the A/D conversion mode, the analog received voice signal transmitted via the communication circuit 7 is converted into a digital code, and the signal is transmitted to the driver 13 via the hook switch 17. When a converted voice signal is transmitted, A/D - D/A
The converter 19 is set to D/A conversion mode, and the receiver 15
The digitally encoded outgoing voice signal transmitted from the terminal via the hook switch 18 is converted into an analog format and transmitted to the interlocutor via the telephone communication circuit 7.

In addition, the voice detection circuit 812 in the handset 8 detects that when the transmitter 82 does not transmit an analog voice signal,
The A/D-D/A converter 811 is set to A/D conversion mode, and the digitally encoded received voice signal transmitted from the receiver 85 is converted into an analog format, and the receiver 81
However, when an analog-format voice signal is transmitted from the transmitter 82, the A/D-D/A converter 811 is set to the D/A conversion mode, and the transmitter 82 The analog transmitting audio signal transmitted through the audio detection circuit 812 is digitally encoded, and the driver 89 and the infrared emitter 87 modulate the infrared rays.

Furthermore, the carrier wave propagated between the telephone main body 30 and the handset 8 is not limited to infrared rays, and many other variations are considered, such as using visible light or radio waves of a predetermined frequency. In this case, the effects of the present invention remain the same.

Further, the carrier wave transmitted from the infrared emitter 12 in the telephone main body 30 and the carrier wave transmitted from the infrared emitter 87 in the handset/receiver 8 have periods T and T which have different phases by approximately 1/2 cycle.
It is not limited to time-division format transmission using o, and many other variations can be considered, such as frequency-division transmission using carrier waves with different frequencies, but in any case, this is not the case. The effect of the invention remains the same.

〔Effect of the invention〕

As described above, according to the present invention, in the above-mentioned answering machine, the handset and receiver are not connected to the main body of the telephone by a wired cord, and the user can make a call from a free position away from the main body of the telephone. Note that the digitally encoded voice signal that modulates the carrier wave transmitted from the telephone body into space is encoded by a recording analog-to-digital converter that is not used while the user is at home, and is also transmitted from space. The digitally encoded audio signal demodulated from the carrier wave is decoded by a digital-to-analog converter for reproduction, which is not used while the user is at home, so it can be realized without sacrificing economic efficiency.

[Brief explanation of the drawing]

FIG. 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 the infrared voice pulse train in FIG. 2, and FIG. FIG. 5 is a diagram showing an answering machine according to another embodiment of the invention. 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 sending circuit, 7 is a talking circuit, 8 is a handset, 9 and 88 are an A/ D converters, 10 and 84 are D/
A converter, 11 is an IC memory, 12 and 87 are infrared emitters, 13 and 89 are drivers, 14 and 83 are infrared receivers, 15 is a receiver, 16 and 810 are i
No entry gates, 19 and 811 are A/D - D/A
Converter, 20 is a mode switch, 30 is a telephone body, 81
82 is a telephone receiver; 100 is an analog-to-digital converter for recording; 200 is a digital-to-analog converter for reproduction; 300 is a first transmitting means; 400 is a first receiving means; 500 is a switching means; second receiving means, 700
8 is a second digital-to-analog converter; 800 is a second analog-to-digital converter; 900 is a second transmitting means;
12 indicates a voice detection circuit. Agent Patent Attorney Sada Igata −

Claims (1)

[Claims] An IC memory (11), a recording analog-to-digital converter (100), and a reproduction digital-to-analog converter (2).
00), wherein the answering machine is comprised of a telephone main body (30) and a handset (8).
and a first transmitting means (300) that modulates a carrier wave with a digitally encoded voice signal and transmits it via space, in the telephone main body (30), and transmits it via the space. a first receiving means for receiving a carrier wave modulated by a digitally encoded audio signal and demodulating the digitally encoded audio signal;
400), when the hook switch is in an off-hook state, switching the output terminal of the recording analog-to-digital converter (100) from the write terminal of the IC memory (11) to the first transmitting means (300); The input terminal of the reproduction digital-to-analog converter (200) is connected to the IC memory (1).
switching means (500) for switching from the readout terminal of 1) to the first receiving means (400); and a digitally encoded audio signal transmitted via the space to the handset (8). second receiving means (
600), and a second digital-to-analog converter (600) that converts the digitally encoded audio signal output from the second receiving means (600) into an analog audio signal and inputs it to the handset (81). 700), a second analog-to-digital converter (800) that digitally encodes the analog audio signal output from the transmitter (82), and a second transmitting means for modulating a carrier wave with a digitally encoded audio signal and transmitting it via the space;
900).