JPH0556268A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To decrease the load to a CPU and to minimize the limited software program by performing the compression and restoration of voice data by the thinning operation and the interpolating operation respectively. CONSTITUTION:A voice signal transmitted by a data line is ADD-converted by an A/D converting part (a), compressed by a thinning operating means (b), the voice data to be stored are stored in a storage part (c) and the voice data except them are discharged. At the time of the reproduction, the data stored in the storage part (c) by an interpolating operating means (d) are removed, the prescribed interpolation is performed, and thus, the data discharged at the time of the sound recording are interpolated and restored. The restored data are sent through a D/A converting part (e) to a data line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile device that performs facsimile transmission.

[0002]

2. Description of the Related Art Facsimile machines perform recording and reproduction by a modem having a modulator for converting a voice signal input from a telephone line into voice data and a demodulator for restoring an electric signal corresponding to the telephone line. The audio signal or audio data is input / output. Conventionally, as a method of this modulation and demodulation, an ADPCM (Adaptive Diff-erential Pulse Code Modula) is used.
tion) is used.

That is, at the time of recording, when a telephone line signal is input to the modem section from the line control section, the microprocessor controls the modem section to obtain voice data from the modem section. RAM encoded in the ADPCM method stored in ROM
Stored in.

[0004]

By the way, the above-described ADPCM method is performed by the CPU 4, but at this time, it is necessary to perform arithmetic operations such as multiplication and division of decimals.
There is a very burdensome problem for U4. There is also a problem that the software program used is complicated and large-scale. The present invention has been made to solve the above points,
An object of the present invention is to provide a facsimile apparatus which reduces the load on the CPU and has a small control software program.

[0005]

In order to achieve the above object, the description will be made with reference to the basic conceptual diagram showing the configuration of the present invention shown in FIG. 1. The facsimile apparatus of the present invention transmits data through a data line. A / D conversion unit a for A / D converting a signal to be stored and predetermined data to be stored out of the A / D converted data are stored in the storage unit c and other than the stored data. Thinning operation means b for compressing data by discarding the data of
Interpolation operation means d for retrieving data by taking out the data stored in the storage section c and interpolating the data
And a D / A converter e that sends a signal obtained by D / A converting the restored data to the data line.

[0006]

The thinning operation means compresses data during recording to reduce the amount of stored data, and the interpolation operation means restores thinned data during reproduction. Also, the control software program becomes smaller.

[0007]

Embodiment FIG. 1 is a basic conceptual diagram showing the configuration of an embodiment of the present invention. Embodiments of the present invention will be described below with reference to the drawings. The voice signal transmitted by the data line is A /
A / D conversion is performed in the D conversion unit a, and audio data is output. As for the A / D converted voice data, the voice data to be stored by the thinning operation means b is stored in the storage section c, and the other voice data is discarded. Further, during reproduction, the data stored in the storage section c is taken out by the interpolation operation means d and subjected to predetermined interpolation, so that the data discarded at the time of recording is interpolated and restored. This restored data is D / A converted by the D / A converter e.
It is converted and sent as an electric signal to the data line.

The embodiment of the present invention described above is implemented by the hardware configuration shown in FIG. That is, the line controller 1
The voice signal transmitted from the data line is received and input to the modem unit 2, or the voice signal from the modem unit 2 is output to the data line. The modem unit 2 also includes an A / D converter and a D / A converter. Therefore, the voice signal input from the data line unit 1 is A / D converted, and the obtained voice data is input to the main control unit 8 directly or by I / O. On the other hand, the audio data input from the main control unit 8 directly or by using the I / O port is D / A.
The converted and obtained voice signal is output to the line control unit 1. The main control unit 8 includes a CPU 4, ROM 5, RAM
6, a facsimile control unit 7. A predetermined thinning operation method and interpolation method are stored in advance in the ROM 5, and the CPU 4 processes the audio data by this method. In addition, RAM6
Stores the thinned data.

Next, the operation of the facsimile apparatus of the present invention having the above-mentioned hardware structure will be described. First, at the time of recording, the CPU 4 inputs voice data having a period equal to the constant period of the A / D converter from the modem unit 2. Therefore, the input voice data is thinned out, that is, sorted into one to be stored and one to be discarded, and the voice data to be stored is stored in the RAM 6. This RAM6
The data stored in is the audio data used during playback.

Next, during reproduction, the CPU 4 causes RA
The data stored in the M6 or the ROM 5 is taken out, the data discarded at the time of recording is restored by the interpolation operation, and is output to the D / A converter. Here, the voice data is reproduced into a voice signal corresponding to the data line, and the line control unit 1
Sent to.

[0011]

As described above, according to the present invention, the compression and the decompression of the audio data are configured to be performed by the thinning operation and the interpolating operation, respectively. Therefore, the load on the CPU is reduced, and the control software program Can be made smaller. As a result, the CPU can perform other tasks at the same time while recording or reproducing voice data, and since the control software program can be small, the limited ROM memory can be installed in other programs. It can be used for storing voice data, etc., so that high functionality can be realized.

Further, since the audio data is not encoded as in the conventional case, even if an error occurs in a part of the data, the subsequent reproduction can be normally performed and the reliability is improved.

[Brief description of drawings]

FIG. 1 is a basic conceptual diagram showing the configuration of the present invention.

FIG. 2 is a hardware configuration diagram of an embodiment of the present invention.

[Explanation of symbols]

 a ... A / D converter b ... thinning operation means c ... storage section d ... interpolation operation means e ... D / A conversion section

Claims (1)

[Claims] 1. A / D signal transmitted from a data line
A / D conversion unit to be converted, and of the A / D-converted data, predetermined data to be stored is stored in the storage unit, and data other than the stored data is discarded. Thinning-out operation means for compressing, and taking out the data stored in the storage unit,
Interpolation operation means for restoring the data by interpolating the data, and D for sending a signal obtained by D / A converting the restored data to the data line.
A facsimile machine having an A / A converter.