JPH0548818A - Equipment - Google Patents

Abstract

(57) [Summary] [Structure] A modem including an A / D converter for converting an image signal and an audio signal into digital data and a D / A converter for converting the image data and the audio data into an analog signal, And a main control unit that performs a process of receiving the image signal and the audio signal and a process of generating the image signal and the audio signal to be transmitted. [Effect] A / D converter and D included in the modem
By using the A / A converter, it is possible to prevent the circuit configuration of the facsimile apparatus from becoming complicated and the cost from increasing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus for transmitting and receiving an image signal and a voice signal through a telephone line, and more particularly to improvement of a modulation circuit and a demodulation circuit for the voice signal and the image signal.

[0002]

2. Description of the Related Art Due to the recent demand for multifunctional facsimile machines, facsimile machines having a voice signal input / output function have been put into commercial use.

FIG. 5 is a block diagram of a conventional facsimile apparatus. Referring to FIG. 5, this facsimile machine
The image system A includes an image system A and an audio signal system B. The image system A includes a line control circuit 1 connected to a telephone line L, a modem 2, an input / output port 3 and a main control unit 4. Audio signal system B
Includes a microphone 7, an amplifier 8, a switch circuit SW1, a filter 9, a filter 10, a switch circuit SW2, and an amplifier 1.
1, a speaker 12, a voice encoding / decoding device 13, and a RAM 14 (random access memory).

The line control circuit 1 determines whether the received signal is a facsimile signal or a call signal based on the identification signal included in the signal given through the telephone line L. If the determination result is a facsimile signal, the telephone line L and the modem 2 are connected, and if the determination result is a voice signal, the telephone line L and the switch circuits SW1 and SW2 are connected.

The modem 2 demodulates image data for image formation from the supplied image signal and supplies the demodulated image data to the main controller 4 through the input / output port 3. Also,
Modulates image data to be transmitted to generate an image signal,
The generated image signal is given to the telephone line L through the line control device 1.

The main controller 4 includes a CPU 4a, a ROM 4b,
It includes a RAM 4c and a facsimile controller 4d. The facsimile control unit 4d gives the given image data to the image forming apparatus 5. The image forming apparatus 5 prints out based on the given data. The facsimile controller 4d also transfers the image data generated by the image data generator 6 to the modem 2. This CPU4a
According to the program stored in ROM4b,
The data output to the RAM 4c is processed. R
The OM 4b stores a program for forming an image, a program for controlling the output timing of an audio signal, and the like. The RAM 4c is a memory for temporarily storing data from the input / output port 3 and facsimile data.

The switch circuits SW1 and SW2 are operated by the user to connect the telephone line L and the amplifiers 8 and 11.

The user can talk with the other party through the microphone 7 and the speaker 12. Filter 9,1
0 allows signals in the voice band to pass.

Details of the voice encoding / decoding device 13 are shown in FIG.
Shown in. This device 13 includes an amplifier 13a, an A / D converter 13b, a voice decoding circuit 13c, and a control circuit 13.
d, voice decoding circuit 13e, D / A converter 13f,
And an amplifier 13g. The control circuit 13d is responsive to a control signal provided from the main control unit 4 through the input / output port 3 and is responsive to the A / D converter 13b and the voice encoding circuit 1.
3c, voice decoding circuit 13e and D / A converter 1
Control 3f. That is, the audio signal that has passed through the filter 9 is amplified by the amplifier 13a, A / D converted, and then encoded by the audio encoding circuit 13c. The encoded voice data is stored in the RAM 14.
When outputting an audio signal based on the audio data stored in the RAM 14, the RAM 14 is controlled by the control circuit 13d.
The audio data is read out from and supplied to the audio decoding circuit 13e. Voice decoding circuit 13e given voice data
Decodes the audio data and gives it to the D / A converter 13f. The D / A converter 13f restores the audio signal by D / A converting the encoded audio data. The restored audio signal is amplified by the amplifier 13g and then given to the filter 10.

FIG. 7 is a block diagram showing details of the modem 2. The modem 2 includes a filter 2a, an A / D converter 2b, a demodulation circuit 2c, a control circuit 2d, a modulation circuit 2e, D.
The A / A converter 2f and the filter 2g are included. The control circuit 2d responds to the control signal from the main control circuit 4 in response to A
It controls the / D converter 2b, the demodulation circuit 2c, the modulation circuit 2e, and the D / A converter 2f.

Next, the operation of the modem 2 will be described. After the noise is removed from the image signal provided to the filter 2a, A
It is given to the / D converter 2b, where it is converted into digital data. The converted digital data is demodulation circuit 2
After being demodulated by c, it is given to the control circuit 2d. The control circuit 2d transfers the given signal to the main control unit 4.

When transmitting an image signal, the main controller 4 supplies image data to the control circuit 2d, and the control circuit 2d supplies the image data to the modulation circuit 2e. The image data modulated by the modulation circuit 2e is converted into an analog signal by the D / A converter 2f and then given to the line controller 1 through the filter 2g.

As described above, if the facsimile apparatus has a voice signal output function, the voice signal can be transmitted and received together with the image signal, and the voice signal can be recorded, so that the message is automatically transmitted to the partner station. You can use it as an answering machine.

[0014]

However, in the conventional facsimile apparatus, the image system and the audio signal system are separated, the circuit becomes complicated, and the cost becomes high.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a facsimile apparatus which can prevent the circuit configuration from becoming complicated and the cost to be increased by integrating the audio signal system and the image system.

[0016]

The present invention for achieving the above object provides a facsimile apparatus including a transmitter for transmitting image signals and audio signals through a telephone line and a receiver for receiving both signals. , Has the following features. That is, the receiving device is discriminated by the discriminating means for discriminating whether the received signal is an audio signal or an image signal, the A / D converting means for A / D converting the received audio signal and image signal, and the discriminating means. In response to the results
A coding unit for coding the A / D-converted audio signal, a storage unit for storing the audio data coded by the coding unit, and A in response to the result judged by the judging unit Demodulation means for demodulating data for image formation from the / D-converted image signal, wherein the transmission device includes image data generation means for generating image data to be transmitted, and the encoded data from the storage means. And a decoding means for reading and decoding the voice data and transmitting the voice signal to the telephone line, the voice data decoded by the decoding means is selected and the image signal is transmitted to the telephone line. In this case, the selecting means for selecting the image data generated by the image data generating means and the D / A for the audio data and the image data connected by the selecting means.
It includes a D / A converting means for converting and a sending means for sending the signal D / A converted by the D / A converting means to the telephone line.

A facsimile machine for transmitting and receiving image signals and audio signals through a telephone line has the following features. That is, storage means for writing voice data to be transmitted, image data generating means for generating image data to be transmitted, decoding means for reading and decoding the voice data from the storage means, and the telephone. When transmitting a voice signal to the line, the voice data decoded by the decoding means is selected, and when transmitting an image signal to the telephone line, the image data generated by the image data generating means. Selecting means for selecting the audio data and the image data selected by the selecting means.
It includes a D / A conversion means for A / A conversion and a transmission means for transmitting the signal D / A converted by the D / A conversion means to the telephone line.

[0018]

According to the present invention described above, the audio signal and the image signal are A / D converted by the A / D conversion means, and the audio data A / D converted by the decoding means is encoded and stored in the storage means. There is. As a result, the A / D conversion means can be used for both audio and image signals,
It is possible to eliminate the need for a voice-only A / D conversion circuit.
Further, the D / A conversion means D / A converts the image data or the audio data. As a result, the D / A conversion means can be used for both the audio signal and the image signal, so that the D / A conversion circuit dedicated to the audio can be eliminated.

[0019]

FIG. 1 is a block diagram showing an embodiment of the present invention. Referring to the figure, this facsimile machine is shown in FIG.
(1) The filters 9 and 10 and the voice encoder / decoder 13 are deleted, and (2) the modem 2'is provided in place of the modem 2 ( 3) A program for voice encoding / decoding is written in the ROM 4b, (4) R
That is, a coded data storage device 15 is provided in place of the AM 14.

Other circuits similar to those shown in FIGS. 5 to 7 are designated by the same reference numerals, and their description will be omitted as appropriate.

The modem 2'converts the image signal and the audio signal supplied through the line control circuit 1 into a digital signal, and supplies the converted digital signal to the main control section 4 through the input / output port 3. Further, the modem 2'converts the image data and the voice data from the main control section 4 into an analog signal and gives it to the line control circuit 1.

The main control unit 4 determines whether the received signal is an image signal or an audio signal based on the digital data from the modem 2 ', and in accordance with the result of the determination, a program for image formation or audio decoding. Programs for answering machines, programs for answering machines, etc.

The encoded data storage device 15 includes a main controller 4
The data encoded by is stored.

FIG. 2 is a block diagram showing details of the modem 2 '. Referring to FIG. 2, the modem 2'is different from the modem 2 of FIG. 7 in that a first selection circuit 16 for bypassing the demodulation circuit 2c and a second selection circuit for bypassing the modulation circuit 2e are provided. That is, the circuit 17 is added. The filters 2a and 2g pass an audio signal and an image signal in a predetermined band. The control circuit 2d is responsive to the control signal from the main control unit 4 to convert the A / D converter 2b,
First selection circuit 16, second selection circuit 17, and D /
The A converter 2f is controlled. A / D converter 2b
Converts the image signal and the audio signal from analog to digital. The output of the first selection circuit 16 is switched by the control circuit 2d, and the digital data from the A / D converter 2b is given to the control circuit 2d or the demodulation circuit 2c. The output of the second selection circuit 17 is switched by the control circuit 2d, the image data from the control circuit 2d is applied to the modulation circuit 2e, and the audio data is applied directly to the D / A converter 2f. The D / A converter 2f receives the image data from the modulation circuit and the second data.
The voice data from the selection circuit 17 is converted from digital to analog. The filter 2g removes a noise component from the analog signal from the D / A converter 2f and gives it to the line control circuit 1.

3 and 4 show a flow chart for voice data and a flow chart for answering machine of the programs stored in the ROM 4b.

The operation of the facsimile apparatus shown in FIGS. 1 to 4 will be described with reference to the flowcharts of FIGS. 3 and 4.

When voice data is recorded by the encoded data storage device, the switch SW is operated in step S1.
1 is controlled to connect the microphone 7 and the modem 2 '. When the operator gives a desired message to the microphone 7, the voice signal is supplied to the filter 2a of the modem 2 '. The A / D converter 2b converts the given audio signal into digital data.

In step S2, the modem 2'is controlled. That is, the CPU 4a controls the first selection circuit 16 of the modem 2 ', and controls the digital data (voice data) converted by the A / D converter 2b to the control circuit 2d.
Supply directly to. As a result, the demodulation circuit 2c is bypassed. The audio data given to the control circuit 2c is given to the CPU 4a through the input / output port 3.

In step S3, the digital data is decrypted. The CPU 4a encodes the audio data according to the program stored in the ROM 4b. An example of this program is the adaptive pulse code modulation method (ADPCM).

In step S4, the encoded data is stored in the encoded data storage device 15. Step S
At 5, the voice data storage program ends. The audio data stored in the encoded data storage device 15 is inserted before or after the image data as a special message when the image signal is transmitted. When the facsimile machine functions as an answering machine, it is used as message data for notifying the other party of the absence.

FIG. 4 is a diagram showing a received signal processing program. It is assumed that the facsimile machine has the answering machine function set.

In step S1, it is determined whether the received signal is an audio signal or an image signal. The discriminating process is based on the data included in the signal received through the telephone line L for identifying the facsimile signal and the voice signal.

If it is determined in step S1 that the signal is a voice signal, the modem 2 is controlled in step S2. By this control, the received signal that has passed through the filter 2a is converted into digital data by the A / D converter 2b, and then is supplied to the control circuit 2d through the first selection circuit 16. The demodulation circuit 2c for restoring this image data is bypassed. The control circuit 2a transfers the given digital data to the main controller 4.

In step S3, the message for answering machine stored in the encoded data storage device 15 is output. The content of this message is, for example, "I am out of the office right now, if there is a requirement, please ask after the beep."

In step S4, it is determined whether or not a message is input from the other party. If a message is input, the voice data encoding program shown in FIG. 3 is read out in step S5, and the message from the other party is read. Is encoded and stored in the encoded data storage circuit 15. Recording is completed as described above.

If it is determined in step S1 that the received signal is image data, image data demodulation processing is performed in step S6. That is, when the received signal is an image signal, the control of the modem 2'in step S2 is not performed and a path bypassing the demodulation circuit and the modulation circuit is not formed, so that the received signal is the filter 2a and the A / D converter. 2b, the first selection circuit 16, the demodulation circuit 2c, and the control circuit 2d are transferred to the main control unit 4.

In step S7, an image is formed. When transmitting the image data, the image data is transferred from the main control unit 4 to the control circuit 2d, and the transferred image data is transmitted to the second selection circuit 17, the modulation circuit 2e, and the D / D circuit.
It is sent out to the telephone line L through a route formed by the A converter 2f and the filter 2g.

In the above embodiment, when receiving, the received audio signal and image signal are converted into digital data by the A / D converter 2b included in the modem 2 ',
When transmitting, image data and audio data are converted to analog signals by the D / A converter 2f included in the modem 2 '. This eliminates the need to provide an A / D converter or D / A converter dedicated to audio. Further, a program for voice encoding / decoding is written in the ROM 4b of the main control unit 4. Therefore, it is possible to incorporate a conventionally-dedicated circuit dedicated to audio together with a circuit for image formation. As a result, the circuit configuration of the facsimile device can be simplified and the cost can be reduced.

[0039]

As described above, according to the present invention, the A / D conversion means performs A / D conversion on the image signal and the audio signal, and the D / A conversion means performs the D / A conversion on the image data and the audio data.
A / A, which was previously provided only for voice to convert
The D converter and D / A converter can be eliminated. As a result, the processing of the audio signal and the image signal can be mixed with the image processing circuit of the facsimile device,
It is possible to prevent the circuit configuration from becoming complicated and the cost from increasing.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

2 is a block diagram showing details of a modem 2'of FIG.

FIG. 3 is a voice data storage / processing program.

FIG. 4 is a diagram showing a received signal processing program.

FIG. 5 is a block diagram of a conventional facsimile apparatus.

FIG. 6 is a block diagram of a conventional speech encoding / decoding device.

FIG. 7 is a block diagram showing details of a conventional modem.

[Explanation of symbols]

 1 line control circuit 2'modem 4 main control unit 5 image forming device 6 image data generator 15 coded data storage device 2b A / D converter 2c demodulation circuit 2e modulation circuit 2f D / A converter 16 first selection circuit 17th 2 selection circuits

Claims (2)

[Claims] 1. A facsimile apparatus including a transmitting device for transmitting an image signal and an audio signal through a telephone line and a receiving device for receiving the both signals, wherein the receiving device is a voice signal or an image signal. Determining means for determining whether the received audio signal and image signal are A / D converting means for performing A / D conversion on the received image signal;
A / D in response to the result determined by the determining unit, an encoding unit that encodes the A / D-converted audio signal, a storage unit that stores the audio data encoded by the encoding unit.
Demodulating means for demodulating data for image formation from the converted image signal, wherein the transmitting device is an image data generating means for generating image data to be transmitted, and the encoded audio from the storing means. Decoding means for reading and decoding data, and when transmitting a voice signal to the telephone line, when selecting voice data decoded by the decoding means and transmitting an image signal to the telephone line Includes a selecting means for selecting the image data generated by the image data generating means, a D / A converting means for D / A converting the audio data and the image data connected by the selecting means, and the D / A. A facsimile apparatus comprising: a sending unit that sends the signal D / A converted by the converting unit to the telephone line. 2. A facsimile device for transmitting and receiving an image signal and a voice signal through a telephone line, comprising: storage means for writing voice data to be transmitted; image data generating means for generating image data to be transmitted; When the voice data is read from the storage means and decoded, and when the voice signal is transmitted to the telephone line, the voice data decoded by the decoding means is selected, and the voice line is transmitted to the telephone line. When transmitting an image signal, a selecting means for selecting the image data generated by the image data generating means, and a D / A converting means for D / A converting the audio data and the image data selected by the selecting means. And a sending means for sending the signal D / A converted by the D / A converting means to the telephone line.