JPH0447751A - facsimile machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile machine with an improved input processing circuit that captures analog signals such as video signals and various sensor signals and converts them into digital signals.

[Prior Art] A conventional example of an input processing circuit for this type of facsimile machine is shown in FIG. In the figure, an input processing circuit 1 includes an image signal input processing section 3 that inputs and processes an analog video signal from a COD obtained by reading a document image with a scanner 2, a paper end sensor 4, and a temperature sensor 5 disposed in a thermal head. The facsimile apparatus includes a sensor signal input processing section 6 that inputs and processes sensor signals from various sensors arranged in various parts of the facsimile machine.

The image signal input processing section 3 includes an analog video processing circuit 7 that performs removal of DC components included in the video signal from the COD of the scanner 2, normalization processing of peak values, shading correction, etc.; High-speed A/D converts analog signals into digital data
It consists of a converter 8 and a digital video processing circuit 9 that performs MTF correction, edge processing, etc. of the digital data converted by the A/D converter 8. Note that the division of functions between the analog video processing circuit 7 and the digital video processing circuit 9 is not necessarily clear.

On the other hand, the sensor signal input processing section 6 includes a multiplexer 10 that sequentially switches and outputs the paper end sensor 4 and temperature sensor 5 equivalent sensor inputs using a SEL signal, and converts the analog sensor signal output from the multiplexer 10 into digital data. It consists of a low-speed A/D converter 11.

[Problems to be Solved by the Invention] As described above, the conventional facsimile machine has an image signal input processing section 3 and a sensor signal input processing section 6 in its input processing circuit.
High-speed A/D
Two A/D converters, the converter 8 and the low-speed A/D converter 11, are required, and components having the same function are provided redundantly, resulting in a problem of being uneconomical and reducing component mounting efficiency.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an economical facsimile machine that improves mounting efficiency by reducing the number of parts.

[Means for Solving the Problem] Therefore, the present invention inputs an analog signal output from an analog video processing circuit to a multiplexer together with various analog sensor signals, and outputs the output of the multiplexer from A to A.
After inputting the data to a /D converter and converting it into digital data, only the digital video data is input to a digital video processing circuit.

[Function] With this configuration, only one A/D converter is required because it can be used commonly for video signals and sensor signals, thereby reducing costs by reducing the number of parts and improving component mounting efficiency.

[Embodiment] FIG. 1 shows the configuration of an input signal processing circuit of a facsimile machine according to an embodiment of the present invention.

In the figure, the same reference numerals as in FIG. 3 indicate the same or equivalent parts, and the difference from the configuration in FIG. 3 is that the output of the analog video processing circuit 7 is input to the multiplexer 10, and the output of the multiplexer 10 The A/D converter 8 is connected to the side, and the digital video processing circuit 9 is connected to the output data bus of the A/D converter 8.

With this configuration, the scanner 2 reads an image for one line of a document (not shown), inputs it to the input processing circuit 1, passes through the analog video processing circuit 7, the multiplexer 10, the A/D converter 8, and the digital video processing circuit 9. The time required to perform the necessary processing and output from the input processing circuit 1 is T□
shall be. In addition, the scanning period for each line is set to a longer time T than this, and the processing is performed by allocating (T-T) time to the input processing time of various sensors. That is, as shown in FIG. 2(a), during T time during this original reading scanning period T, the multiplexer 10 is switched to the analog video processing circuit 7 side by the SEL signal, and one line obtained from the CCD of the scanner 2 is After inputting the analog video signals for A to the multiplexer 10 via the analog video processing circuit 7,
/D converter 8 to digital video processing circuit 9. The video signal input processing at this time is exactly the same as the processing described in FIG. 3, except that the analog video signal from the analog video processing circuit 7 is input to the A/D converter 8 via the multiplexer 10. . Next, when the remaining time T2 (=T-T□) of T comes, the multiplexer 10 is sequentially switched to the paper end sensor 4, temperature sensor 5, etc. by the SEL signal, and the signals from the various sensors are sent to the multiplexer 10 and the A/D. The signal is output from the input processing circuit 1 via the converter 8, and is sequentially updated and stored in a memory of a control circuit (not shown).

Note that the control circuit sequentially retrieves these sensor signals from memory and performs processing such as status monitoring by performing comparison calculations with set values, but at this time, the sensor signals are processed immediately without being stored in memory. If the input processing of one sensor signal takes time due to the At time 72 (1), the signal from the paper end sensor 4 may be inputted, and at time 72 (2) of the second cycle (2), the signal from the temperature sensor 5 may be inputted.

In this way, the output of the analog video processing circuit 7 is input to the multiplexer 10 in the same way as the paper end sensor 4 and the temperature sensor 5, and the output is converted into a digital signal by the A/D converter 8, and then the sensor signal is directly input to the multiplexer 10. ,
By outputting the video signal through the digital video processing circuit 9, the A/D converter 8 can be used both for the video signal and for the sensor signal, and one A/D converter can be eliminated. This reduces costs and improves component mounting efficiency.

[Effects of the Invention] As explained above, according to the present invention, since the A/D converter is shared for video signals and sensor signals, it is possible to reduce costs by reducing the number of parts and improve component mounting efficiency. .

[Brief explanation of the drawing]

1@ is a configuration diagram of an input signal processing circuit of a facsimile machine showing one embodiment of the present invention, and FIGS. 2(a) and 2(b) are
FIG. 3 is a time chart of the processing operation shown in FIG. 3, and FIG. 3 is a configuration diagram of an input signal processing circuit of a conventional facsimile machine. 2...Scanner, 4...Paper end sensor, 5
...Temperature sensor, 7...Analog video processing circuit,
8... AlD converter, 9... Digital video processing circuit, 10... Multiplexer.

Claims (1)

[Claims] In a facsimile machine that converts analog video signals input from a scanner and analog sensor signals input from various sensors into digital signals and processes them,
It is characterized by comprising a multiplexer that sequentially switches and outputs the input analog video signal and various analog sensor signals at a predetermined timing, and an A/D converter that converts the analog signal output from the multiplexer into a digital signal. facsimile machine.