JPS6253071A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To decrease the number of programable signal generators by holding a phase matching point while transmitting a CFR signal, and switching a programmable signal generator to generate a tonal signal or a clock synchronized with a picture element signal by means of time dividing. CONSTITUTION:A CPU 11 controls the programmable signal generator 13, a switcher 14, and a 1-line picture signal-section synchronizing-signal generator 16. To the CPU 11, a picture signal synchronizing pulse P of optional bits outputted from a picture element signal synchronizing pulse generator 15 is inputted. And also, the CPU 11 detects a phase signal PHS transmitted from a transmitter, and executes the phase matching. After detecting the cutting of the phase signal PHS from the transmitter, the receiver makes the output from the generator 13 to be in input to a tonal signal generator 12 by its switcher 14, and transmits a reception confirmation signal CFR by controlling the generator 13 through the CPU 11. Consequently, the synchronizing pulse generator 15 generates picture element synchronizing pulse P after receiving the signal from the programmable signal generator 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a 7-axis device, and more particularly to a 7-axis device incorporating means for maintaining a phase matching point.

Conventional technology Conventionally, a 7-axis device that detects a phase signal sent from a transmitter through 7-axis communication and then performs phase matching and sends out a CFR signal (reception 1a signal) A clock synchronized with the image signal is run free, and the phase matching point is held until the image signal sent from the transmitter is detected.

For this purpose, two programmer puller signal generators are required to generate tonal signals including CFR signals and clocks synchronized with image signals.

Problems to be Solved by the Invention The conventional 7-axis device described above has the following steps in order to generate a tonal signal and a clock synchronized with the image signal.
Two programmable signal generators are required].Furthermore, if the peripheral circuit of the modulator/demodulator including these functions is integrated into an LSI, the LSI becomes complicated and expensive.

Means for Solving the Problems In order to achieve the above object, the facsimile apparatus according to the present invention includes a progera i pull single signal generator for generating a tonal signal or generating a clock synchronized with a pixel signal. It has a signal generator to maintain a phase matching point during CFR transmission.

That is, specifically, the facsimile device according to the present invention:
It is synchronized with the phase signal sent out from the transmitter and then sent n
A facsimile device that records an incoming image signal includes a single signal generator that generates a clock signal, a tonal signal generator that generates a tonal signal based on the output of the signal generator, and a single signal generator that generates a tonal signal based on the output of the signal generator. a pixel signal synchronization pulse generator that generates a pixel signal synchronization pulse of any bit based on the output; and a switching means that selectively switches the output of the signal generator to the tonal signal generator or the pixel signal synchronization pulse generator. a phase matching means that controls the switching means, inputs the pixel signal synchronization pulse, detects the phase signal, and performs phase matching; and synchronization signal generating means for generating a synchronization signal that maintains the obtained n phase matching points.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings, taking the G27 axis ξ of CCITT Recommendation T30 as an example.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure is a timing chart for explaining the present invention. In FIG. 1, reference number 11 indicates a CPU;
PUII is a programmable signal generator 13, a switch 1
4 and l line picture signal section synchronization signal generator 16 is controlled, and pixel signal synchronization pulse generator 15 outputs n
It has a function of inputting an image signal synchronizing pulse P of arbitrary bits (8 bits in this embodiment) and detecting a phase signal PH8 exiting from the transmitter to perform phase matching. 12
is a tonal signal generator that generates tonal signals such as the reception confirmation signal CFR, l:H! A programmable signal generator that generates a programmable lock signal, 14 a switch, 15 a pixel signal synchronization pulse generator that generates a pixel signal synchronization pulse P of arbitrary bits (Fi8 bits in this embodiment), and 16 a CPU IIK A line image signal section synchronization signal generator 17 generates a synchronization signal PHDt-Q that maintains the obtained phase matching point, and 17 represents a modem.

The CPU II of the receiver receives the signal P sent from the transmitter.
f(S), the output of the programmable signal relaxer 13 is input to the pixel signal synchronization pulse generator 15 by controlling the switch 14. A pixel synchronization pulse P is generated for each bit.

Upon receiving the phase signal PH8 from the modem 17, the CPU 1
1r! , the data is analyzed for each of the 8-bit pixel synchronization pulses, and phase detection and phase matching are performed. After the phase matching is completed (time T I in FIG. 2), the CPU 11t! Generation of the l-line picture signal section synchronization signal PHDO from the l-line picture signal section synchronization signal generator 16 is started at the phase matching point (time T2 in FIG. 2).

Next, after detecting the disconnection of the phase signal PH8 from the transmitter, the receiver uses the 1 switch 14 to input the output of the signal generator 13 to the tonal signal generator 12, and controls the υ programmable signal generator 13 by the CPU II. , reception confirmation signal CF
Exit R (time 'r3 in Figure 112).

After the output of the received reliable signal CFR is completed, the output of the programmable signal generator 13 is inputted to the pixel signal synchronization pulse generator 15 by the switch 14, so that the pixel synchronization pulse P is output from the pulse generator 15. Occurrence (time T4 in Figure 2)
do.

Each time the pixel synchronization pulse P is generated, the CPU 1l checks the level of the l line/picture signal section synchronization signal PHD output from the l line picture signal section synchronization signal generation circuit 16,
The falling detection point of the synchronization signal PHD (time" in Figure 2)
r5) as a phase matching point, and then records the image signal FIX sent out from the transmitter.

The phase matching point here is the reference point of the image signal of the l line, for example, the point where the first pixel of the l line appears.

FIG. 3 is a 70-chart showing an example of the operation of the present invention.

The present invention has been described above with respect to one preferred embodiment thereof, but
Of course, this is merely an example and does not have a restrictive meaning, and various modifications of the present invention other than the present embodiment can easily be imagined. for example,
In this embodiment, a programmable signal generator is used as the signal generator 13, but instead, m can be generated by a counter, or the synchronization pulse output from the pixel signal synchronization pulse generator 15 Although 8 bits are taken as an example, it is clear that 16 or 32 bits are possible as well.

Effect of Relaxation As explained above, according to the present invention, a circuit that maintains a phase matching point during CFR signal transmission is added, and a programmable circuit for tonal signal generation or clock generation synchronized with pixel signals is provided. By switching the signal generator to time division, the number of programmable signal generators can be reduced by one, and it is easy to integrate the modem peripheral circuit, which includes tonal signal generation and clock immunity functions synchronized with pixel signals, into an LSI. The following effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
This figure is a timing chart for explaining the operation of the embodiment shown in FIG. 1, and FIG. 3 is a flowchart of the operation of the present invention.

Claims (1)

[Claims] A facsimile machine that synchronizes with a phase signal sent from a transmitter and records an image signal sent thereafter has a single signal generator that generates a clock signal and a tonal signal based on the output of the signal generator. a pixel signal synchronization pulse generator that generates pixel signal synchronization pulses of arbitrary bits based on the output of the signal generator; switching means for selectively switching to the pixel signal synchronization pulse generator; means for controlling the switching means and inputting the pixel signal synchronization pulse to detect the phase signal to perform phase matching; and confirmation after phase matching. A facsimile apparatus comprising synchronization signal generating means for generating a synchronization signal that maintains a phase matching point obtained by the phase matching means during signal transmission.