JPH0348564A - Facsimile broadcast receiver - Google Patents

Abstract

PURPOSE:To divert ordinary facsimile equipment for telephone line to some other purpose by transmitting a facsimile image signal from a signal processing circuit to the facsimile equipment according to a transmission control procedure with an image signal sending control circuit. CONSTITUTION:A CPU 9 monitors a received control signal, and starts up the facsimile equipment 19 by controlling a communication control unit 15 when a desired program number is detected, and after that, transfers a signal with the equipment 19 by switching a switch 13 to lower side. After such procedure is completed, the CPU 9 sends an image signal received with the procedure of message transmission and stored in a buffer memory 11 to the equipment 19 via a speed conversion circuit 12, a modem 14, and the circuit 15 by switching the switch 13 to upper side, and makes the equipment 19 print the image signal. In such a way, it is possible to divert existing facsimile equipment for telephone line to the one for a mechanical system for print head and recording, and to realize the facsimile broadcast receiver at a low price.

Description

DETAILED DESCRIPTION OF THE INVENTION A) Field of Industrial Application The present invention relates to a facsimile broadcast receiving apparatus that receives facsimile signals multiplexed with television broadcasts.

B) Conventional technology Since the 1960s, a facsimile broadcasting system was studied that uses television broadcast radio waves to transmit fixed images such as text, graphics, and photographs, and then reproduces and records them on the receiving side (Journal of the Television Society, 87). (See February 2016, etc.), and in February 2007, two methods, analog and digital, were reported to the Minister of Posts and Telecommunications.

Among these, the digital method is transmitted at a transmission rate of 16 kbps, with 11 frames as one unit as shown in FIGS. 6(a) and 6(b). In Figure 5, the portion (DAT) excluding control signals such as MC (mode control signal) and PFX (prefix), CHC (error correction code), and FC (frame synchronization code) is data compressed by run-render encoding. This is an image signal. Next, FIG. 7 shows an example of a conventional configuration of a digital facsimile broadcast receiver. In Figure 7, the television antenna (1
), a desired channel is selected by a television tuner (2), and a facsimile signal multiplexed with an audio signal is extracted and demodulated by a demodulation circuit (3), and converted into a digital signal series. The frame timing of this digital signal sequence is detected in a frame synchronization circuit (4), and then de-scrambled, de-interleaved, and error-corrected on a frame-by-frame basis in a de-scramble and de-interleave circuit (5) and an error correction circuit (6). After correction processing, the compressed R image signal is decompressed by a decoding circuit (7) and recorded by a printer (8). A CPU (including a program ROM and temporary storage RAM) (9) identifies the control signals shown in FIG. 2 and controls the operation of the facsimile receiving apparatus.

C) Problems to be Solved by the Invention Conventionally, when constructing a facsimile broadcast receiver, it has been common to construct a system that includes everything from the tuner and signal processing circuit to the printer, as shown in FIG.

However, the thermal print head and the recording mechanism account for a considerable portion of the cost.

Therefore, even if efforts are made to reduce costs by converting complex signal processing circuits into ICs, there is a limit to the cost reduction.

On the other hand, digital facsimile broadcasting compresses image signals using exactly the same method as telephone facsimile, so in Figure 7, the decoding circuit (7) and printer (8) are the same as existing telephone facsimile. I in circuits and mechanisms
It is possible to do this.

Furthermore, in digital facsimile broadcasting, image signals are transmitted using frames shown in Figure 5.
The effective transmission speed of the image signal excluding control signals, error correction codes, etc. is approximately 9760.83 bps. On the other hand, since the image signal transmission speed of G3 facsimile is 9600 bps, existing facsimile equipment can be used by adding some additional circuits.

The present invention is intended to provide a low-cost facsimile broadcast receiving device that allows existing telephone facsimile devices to be used as is.

2) Means for Solving the Problems The present invention provides a tuner for selectively receiving television broadcasts, a demodulation circuit for extracting a facsimile signal multiplexed with the audio signal of the television broadcast and converting it into a digital signal series, and A facsimile broadcast receiving device that has a signal processing circuit that detects frame timing from a sequence, performs error correction, etc., and obtains a code sequence of a facsimile image, and is capable of receiving at least an image signal through a telephone line and printing a received image. an image signal transmission control circuit located between the apparatus and the signal processing circuit, which generates a startup and communication control procedure signal for the facsimile apparatus, and transmits a facsimile image signal from the signal processing circuit to the facsimile apparatus in accordance with the control procedure; The facsimile image signal is printed using the facsimile device.

E) Operation According to the above means, the facsimile image signal from the signal processing circuit is transmitted to the facsimile machine by the transmission control procedure by the image signal transmission control circuit, and is received by the facsimile machine as a normal facsimile signal and printed.

f) Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows an example of the configuration of a facsimile broadcast receiving apparatus according to the present invention, and FIG. 1 has the same configuration as FIG. The c elements are given the same number and explained. Omitted. (10) is the frame synchronization circuit (4), de-scramble and de-interleave circuit (5), and error correction circuit (6) in Figure 7.
This is a signal processing circuit section consisting of. Further, (1l) is a buffer memory, and (12) is a speed conversion circuit, the details of which will be described later. (13) is a switch circuit, (l4) is a voice band modem used in the telephone network, (l5> is a line control circuit. Also, (16) is an existing 63 facsimile equipment! (
19), (17) is a keyboard for setting the receiver status, and (18) is a display.

Since the effective transmission speed of the facsimile image signal obtained by the signal processing circuit (1o) is about 9760 bps, the speed conversion circuit (12) directly inputs it to the modem and transmits it to the G3 facsimile device It (19). Since the output of the signal processing circuit (1o) is recorded in the buffer memory (11) and read out sequentially at an appropriate timing, the G3 facsimile machine can receive the 96
This is for sending out serial data at 00bps, and an example of its configuration is shown in Figure 2. That is, the speed conversion circuit is mainly composed of a write address counter (2o) and a read address counter (2l). As shown in Figs. 3 and 4, the facsimile image signal input to the puffer memory (11) is mixed with control signals such as MC (mode control signal) and PFX (prefix) and C
HC (Error Correction Code) and FC (Frame Synchronization Code)
The write address counter (
20), a signal processing circuit (10) supplies a write clock signal of 16 KHz and an ENABLE signal as a signal for operating the counter at the timing of <DAT section as shown in FIG. On the other hand, the read address counter (2l) is supplied with a read clock of 9600 bps from the modem (14). In this way, only the DAT part is written to the buffer memory by the speed conversion circuit, and 9
Reading is performed at 600bpS.

Further, the write address counter (20) and the read address counter (21) are reset by being supplied with a reset signal obtained by detecting the head of the page by the CPU (9).

Note that the buffer memory (l1) requires a sufficient memory capacity to prevent data from being lost because the writing speed is faster than the reading speed. In the current case, approximately 161 bits of surplus pits are generated per second due to the speed difference, so most originals can be sent within 5 minutes, so 161X60X5=
Memory that can absorb 48300 bits, e.g. 64kb
It uses the RAM of it.

In addition, the line control circuit (15) generates a predetermined DC voltage and superimposes it on the G3 facsimile device i1 (19) because it needs to be activated, that is, to be in the same state as the incoming call on the telephone line. The ring signal (t
It includes a circuit that generates a telephone ringing signal.
It may be a well-known structure used in public telephone networks or exchanges.

Furthermore, the switch (l3> is controlled by the CPU and G3
Procedure for operating the facsimile machine (19) (C
CITT Recommendation T. 30), the image signal obtained from the speed conversion circuit (12) and C
P U (Serial data output from 91 (G3
facsimile transmission procedure control signal) and input it to the modem (14). The modem (14) generates a signal compatible with G3 facsimile, so the modem (14) complies with CCITT Recommendation V. 21 and ■. 29.

the buffer memory (1l), the speed conversion circuit (12),
Modem (14), line control circuit (l5) and CPU
(9) generates an activation and communication control procedure signal for the image signal transmission control circuit of the present invention, that is, the facsimile device If (19), and according to this control procedure, the facsimile image signal from the signal processing circuit (10) is transmitted to the facsimile device If (19). A control circuit is configured to send data to the device ffi (19).

The operation of the embodiment in the above structure will be explained.

In facsimile broadcasting, in addition to image signals, iIIJg9 signals (MC) such as program numbers and page numbers are sent, and the basic operation of the receiver is standby reception of programs reserved in advance. An example of how the receiver operates in this case is shown below. Normally, the receiving device waits with the line disconnected by the line control circuit (15). The CPU (9) monitored the received control signal, and when the desired program number was detected, it controlled the line control circuit (15) and activated the 03 facsimile using the 7A's A procedure (call setting procedure). After that, switch (13
) to the lower side to perform G3 facsimile and Phase B procedures (procedures performed after call setup and before message transmission)
exchange signals. After the completion of 7A's B, the cPU switches the switch (l3) to the upper side and uses the phase C procedure (message transmission procedure) to store the received data in the buffer memory (l3).
1) The image signal stored in 1) is passed through the speed conversion circuit (12) → modem (14) → line control circuit (15) to the G3 facsimile machine! (19) and send it to the facsimile machine (
19). When the transmission of the image signal for one page is finished, the process moves to 7Aze D (a procedure to confirm that the message transmission has ended), and when the program ends, the initial state of line disconnection is performed by the 7AzeE manual recovery procedure). and wait for the next program to be received.

Next, what is shown in FIG. 4 is another embodiment in which a single 63 facsimile machine can be used for both telephone and broadcast facsimiles, including a line control circuit (15) and facsimile equipment! (19) A changeover switch (22) is provided between the
By switching the changeover switch (22), the facsimile machine is selectively connected to the telephone line (23) or the line control circuit (15) of the receiving device. The changeover switch (22) is the incoming call detection circuit (24).
) may be switched by the CPU (9) in response to the detection signal, so that the telephone system can be received preferentially, or the facsimile broadcast system can be received preferentially. good. In addition, the changeover switch (2
2) can also be switched manually.

However, depending on how the changeover switch (22) is connected, it is possible to send the received image signal of the facsimile broadcast directly to the telephone line (23), but in the above embodiment, copyright law issues are taken into consideration. However, the switch structure is such that this is not possible.In other words, the movable terminal (22a
) to the connection terminal (24) of the G37 axis device (19).
) and connect one fixed terminal (22c) to the telephone line (2
3) to the connecting terminal (25) and the other fixed terminal (25).
2b) is connected to the line control circuit (15).

Next, FIG. 5 shows the main part of another embodiment of the present invention, and what differs from the embodiments of FIGS. 1 and 4 is the structure of the line control circuit (15). That is, in this embodiment, unlike the above-mentioned embodiments, a tone signal of a single frequency, for example, 1300 Hz is used instead of a 16 Hz ring signal as a means for activating the facsimile machine (19) (phase A). I try to use it. Of course, in this case, a facsimile device i (19) that can be activated by this tone signal is used. Incidentally, many facsimile machines in practical use can be activated by a tone signal of 1300 Hz. In Figure 5, (26) is a 48V power supply circuit installed to make it similar to a telephone line, and (27) is a 13V power supply circuit.
00Hz tone signal generation circuit, (28) is a transmitting/receiving amplifier, and (29) is a transformer for the telephone line. (3
0) is a terminal connected to the facsimile machine side. In many cases, the above power supply circuit (26) can be omitted since the facsimile apparatus can be started without it. Further, since the tone signal of 1300 Hz can normally be generated by the modem (l4), the tone generating circuit (27) can also be omitted. Further, the tone signal may be a tone signal consisting of a combination of a plurality of frequencies, such as a dual tone (DTMF), instead of a single frequency.

Furthermore, the present invention is not limited to the above embodiment; for example, the facsimile machine does not have to be G3. However, considering the popularity, price, transmission speed, etc., 63 is the most suitable facsimile device to be connected to a receiving device compatible with the proposed digital facsimile broadcasting system.

g) Effects of the Invention According to the present invention as described above, in a facsimile broadcast receiving device, the print head and recording mechanism, which account for a considerable portion of the cost, can be replaced with an existing telephone line facsimile system. The device can be reused, and a low-cost facsimile broadcast receiving device can be realized.

[Brief explanation of drawings]

1 to 3 each show an embodiment of the present invention,
Fig. 1 is an electrical block circuit diagram, Fig. 2 is a detailed groove diagram of the main part of Fig. 1, Fig. 3 is an explanatory diagram of the operation of Fig. 2, and Fig. 4 is an illustration of another embodiment of the present invention. FIG. 5 is a diagram showing a frame structure of a similar broadcast according to another embodiment of the present invention, and FIG. 7 is an electrical block circuit diagram of a conventional example. (2) Tuner (3): Demodulation circuit (9): CP
U (10): Signal processing circuit (11): Buffer memory (12): Speed conversion circuit (14): Modem (1
5): Line control circuit

Claims (4)

[Claims] (1) A tuner that selectively receives television broadcasts and extracts the facsimile signal multiplexed with the audio signal of the television broadcasts,
In a facsimile broadcast receiving apparatus that has a demodulation circuit that converts the digital signal sequence into a digital signal sequence, a signal processing circuit that detects frame timing from the digital signal sequence, performs error correction, etc., and obtains a facsimile image code sequence, the image signal is transmitted through a telephone line. between the facsimile device capable of receiving at least the received image and printing the received image, and the signal processing circuit, generating a startup and communication control procedure signal for the facsimile device, and transmitting the facsimile image from the signal processing circuit according to the control procedure. A facsimile broadcast receiving device comprising an image signal sending control circuit for sending a signal to the facsimile device, and printing a facsimile image signal using the facsimile device. (2) In the facsimile broadcast receiving device according to claim 1, the facsimile device is of G3 standard, and the image signal transmission control circuit generates a ring signal with a voice band modem used in a telephone network. a ring signal generation circuit, a buffer memory in which a code sequence of a facsimile image obtained by the signal processing circuit can be sequentially written and read out at an appropriate timing, and a speed conversion for sending out from the buffer memory at a signal speed compatible with the facsimile device. A facsimile broadcast receiving device comprising a circuit. (3) In the invention set forth in claim (1), the facsimile device is of G3 standard, and the image signal transmission control circuit includes a voice band modem used in a telephone network and a tone signal that generates a tone signal. A generating means, a buffer memory capable of sequentially writing a code sequence of a facsimile image obtained by the signal processing circuit and reading it at an appropriate timing, and a speed conversion circuit configured to send the code from the buffer memory at a signal speed compatible with the facsimile machine. A facsimile broadcast receiving device comprising: (4) The facsimile broadcast receiving apparatus according to claim (3), wherein the modem includes tone signal generating means.