JPH03248664A - Facsimile broadcast receiver - Google Patents

Abstract

PURPOSE:To facilitate the continuous receiving operation of the program of the same channel by awaiting and receiving all the programs of the channel in a stored time zone. CONSTITUTION:A control part 32 sets a tuner 21 to a reserved channel on the basis of program reserved contents preset by a key operating part 31, and obtains a facsimile signal. This signal is separated 23 into an MC part and a data packet part, and when the MC part is the facsimile broadcast, the contents of a data packet is made effective, and after the error of the data packet is corrected, the packet is separated into a picture signal and a control signal by a separation circuit 25. A program number is extracted 30 from the control signal, and is compared 27 with the reserved program number, and the picture signal of the coincident program number is processed for demodulation 28, and the picture signal is sent to a printer 29.

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 broadcast radio waves and transmitted.

(b) Conventional Technology Currently, teletext services are being provided in order to diversify and improve the sophistication of television broadcasting services. Furthermore, we aim to commercialize facsimile broadcasting, which multiplexes facsimile signals representing facsimile images onto broadcast radio waves, for the purpose of supplementary services for television and teletext broadcasting, and for specific services.
Deliberations are underway at the Telecommunications Technology Council. The contents of this facsimile broadcasting service include, for example, program contents and texts related to broadcast programs, as well as stock market conditions, news, tourist information, specialized information by occupation, and so on.

A transmission system for facsimile broadcasting uses a system in which subcarriers obtained by modulating a facsimile signal are frequency division multiplexed onto an audio signal, which is then FM modulated onto the audio carrier wave and transmitted.

To give an overview of this method, the center frequency of the subcarrier is 4.5 fi (70,804 KHz; the horizontal synchronizing pulse frequency of fi' television), and the facsimile signal is modulated onto this using a four-phase differential phase modulation method. .

As shown in FIG. 4(b), the facsimile signal is
It consists of 32 packet groups each consisting of 8 bits per packet and a frame with a 16-bit frame synchronization signal (FC) added to the beginning.

As shown in FIG. 4(a), each packet is composed of a mode control (MC) section consisting of 16 bits and a data packet (FAT) section consisting of 272 bits. Here, the MC section is a header that identifies whether the data packet section is facsimile broadcasting or another service.

Further, the data packet section has a format including a 14-bit prefix (PFX), a 176-bit data (DAT) section, and an 82-bit error correction bit (CHC) added thereto. The prefix is a signal that identifies whether the contents of the data packet portion are an image signal or a control signal.

The image signal is obtained by converting both original signals into M H (Modified
Haffman) and M R (Modified REA
After encoding using a redundancy reduction encoding method called D),
It consists of a signal to which a control code such as a line synchronization code is added.

The facsimile signal is sent out according to the time sequence shown in FIG. A facsimile broadcast program consists of one page or multiple pages. A program selection signal is attached to the beginning of the image signal of each member of each program and is sent out. The program selection signal includes the program number, page number, or
It includes identification information such as the encoding method being used, and six frames are sent to each member. Furthermore, for each frame, it is sufficient to send at least 3 of the 32 packets of program selection signals, and the remaining packets can be used to send auxiliary information related to facsimile broadcasting, such as a program index, or to exit from other services. However, these details have not yet been officially decided at this stage.

Now, since one page of information is generally sent in several tens of seconds to several minutes, in order to receive the program desired by the receiver, a method is used in which the receiver makes a preset program reservation and receives the program on standby.

This method usually involves presetting the number of the desired program, the number of the receiving channel, and the time slot in which the program is to be sent. Therefore, in this case, it is necessary for the receiver to know in advance the time slot in which the desired program will be sent.

On the other hand, when the reservation start time arrives, the facsimile broadcast receiving device sets the reserved channel, detects the program selection signal while receiving the facsimile signal, and selects the program number included in the program selection signal as the reserved desired program number. If they match, standby reception is performed by printing out the image signal of the received program.

(C) Problems to be Solved by the Invention Conventional standby reception of facsimile broadcasts is difficult to achieve even when you wish to receive consecutive programs on the same channel.
You must make reservations for that number of programs. Further, when receiving consecutive numbers on the same channel, all reception is considered, in which all numbers on the same channel are received, but with this method, it is necessary to start and stop the reception operation manually. In other words, the operator must perform an operation to place the device in a waiting state for reception before the desired program starts, and an operation to place the device in a halt state after reception is completed.

The present invention has been made in view of the above-mentioned circumstances, and aims to facilitate the operation of continuously receiving programs on the same channel.

(d) Means for Solving the Problems The present invention provides a means for presetting and reserving a time zone and channel in a facsimile broadcast receiving apparatus that receives facsimile signals transmitted multiplexed with broadcast radio waves, and a means for presetting and reserving a time zone and a channel. A facsimile broadcast receiving apparatus characterized by comprising a storage section for storing contents, and a means for receiving all programs of the channel in the time period stored in the storage section.

(e) Effects According to the present invention, it is possible to stand by and receive all programs on a reserved channel in a reserved time slot.

(f) Example Embodiments of the present invention will be described based on FIGS. 1 and 2.

FIG. 2 shows a block diagram of a facsimile broadcast transmitting device, in which (2) is a scanning circuit that scans the screen (1) to generate an image signal, and this image signal is sent to the MH by an encoding circuit (3).
The image signal is encoded using the MR method or the MR method, and a control code such as a line synchronization code is further added to the image signal generation circuit (4) to generate an image signal.

On the other hand, (5) is a parameter generation circuit that generates a signal indicating parameters such as the program number, next exit time in the case of repeated exit, page number, encoding method, etc. for the image signal, and these parameters A program selection signal is generated in the program selection signal generation circuit (6) based on the contents of the program selection signal. Further, a control signal generation circuit (7) generates a signal instructing the end of a page or program as a control signal, and these control signals and the image signal are transmitted to a facsimile signal generation circuit (7).
8). This circuit (8) packetizes the input image signal and control signal according to the 7 format shown in FIG. 4(a), and further constructs the frame shown in FIG. 4(b) to generate a facsimile signal.

This facsimile signal is subjected to four-phase differential phase modulation by a modulator (9), superimposed on an audio signal by a superimposer (10), and transmitted as a broadcast radio wave by a transmitter (11).

FIG. 1 shows a block diagram of a facsimile broadcast receiving apparatus according to an embodiment of the present invention, in which (21) is a tuner, and (21) is a tuner;
32) Receives the broadcast wave of the specified channel, extracts the audio carrier wave, and further outputs a composite signal with the audio including the facsimile signal by FM demodulation. (22) extracts the subcarrier of the facsimile signal from the composite signal and
This is a demodulator 1lrJp that demodulates a differential phase modulation signal and outputs a facsimile signal. This revenge! I device (22)
The facsimile signal demodulated in is further frame-synchronized by a signal separation circuit (23) and separated into signal packets of an MC section and a data packet section. MC section is MC
@@ After error correction by BCH, a separate circuit (24) identifies whether or not it is a facsimile broadcast, and in the case of a facsimile broadcast, the contents of the data packet are considered valid and sent to a separation circuit (24).
25). The separation circuit (25) performs error correction on the data packet using a shortened difference set cyclic code, identifies the contents of the prefix, and separates the received data portion into an image signal and a control signal.

(26) is a program number extraction circuit that extracts a program number from the program selection signal received as a control signal, and the program number comparison circuit (27) selects a program stored as program reservation (preset) information in the storage unit (33). The number is compared with the received program number, and if they match, the reception processing circuit (28)
Activate. The image receiving processing circuit (28) is a separation circuit (25).
) is an image processing circuit that performs MH or MR decoding processing on the separated image signals, and the decoded image signals are printed out by a printer (29).

In addition, the number of pixels in one line is calculated for the line information obtained by decoding processing in the image receiving processing circuit (28),
By determining whether the number of pixels matches a predetermined value (for example, 1728 pixels for A4 size), it is possible to determine whether an error has occurred in the received image signal.

(30) extracts the next transmission time information included in the program selection signal. (31) is a key operation section, and by key-in operation, the receiver inputs the desired program number, channel number, and reception time period (A), or the desired channel number and reception time period (B), and performs a preset operation. I do. (32
) is a control unit (CPU) consisting of a microcomputer, which stores the contents preset by the key operation unit (31) in the storage unit (33), and also determines the reservation start time based on the preset contents of the storage unit (33). When this happens, a channel control signal is output to the tuner (21) to control setting of the reserved channel.

The reception operation will be explained below.

(I) When the preset content is A In the facsimile broadcast receiving device, the control section (32) is connected to the key operation section (3
Based on the program reservation contents preset in step 1), when the reservation start time arrives, the tuner (21) is turned on and set to the reserved channel to obtain a facsimile signal. The facsimile signal is further processed by a signal separation circuit (23
) to perform frame synchronization and separate signal packets into MC section and data packet section. The MC section is connected to the MC section identification circuit (2
In step 4), after error correction by BCH, it is determined whether or not it is a facsimile broadcast, and if it is a facsimile broadcast, the content of the data packet is determined to be valid and is instructed to the separation circuit (25). A separation circuit (25) performs error correction on the data packet using a shortened difference set cyclic code, identifies the contents of the prefix, and separates the received data portion into an image signal and a control signal.

A program number is extracted from the control signal by an extraction circuit (30), and compared with a reserved program number by a comparison circuit (27),
The image reception processing circuit (2
8) performs MH or MR decoding processing, and the decoded image signal is printed out by the printer (29).

Thereafter, printout is performed until a page end signal or program end signal is received, and when the printout is completed, it is determined whether or not the reservation end time has passed. If the reservation end time has passed, the series of processing ends.

(IT) When the preset content is B In the facsimile broadcast receiving device, the control section (32) is the key control section (
Based on the program reservation details preset by 31),
When the reservation start time arrives, the tuner (21) is controlled and set to the reserved channel to obtain a facsimile signal. For facsimile signals, a signal separation circuit (23)
The frame is synchronized and separated into signal packets of the MC section and the data packet section. The MC section is connected to the MC section identification circuit (24
), after error correction by BCH, it is determined whether or not it is a facsimile broadcast, and if it is a facsimile broadcast, the content of the data packet is validated and an instruction is given to the separation circuit (25). A separation circuit (25) performs error correction on the data packet using a shortened difference set cyclic code, identifies the contents of the prefix, and separates the received data portion into an image signal and a control signal.

Then, the image signal is extracted by the image receiving processing circuit (28), and the image signal is processed by the image receiving processing circuit (28).
H'? MR method decoding processing is performed, and both decoded signals are printed out by a printer (29).

Thereafter, printout is performed until a page end signal or program end signal is received, and when the printout is completed, it is determined whether or not the reservation end time has passed. If the reservation end time has passed, the series of processing is completed, whereas if the reservation end time has not passed, the same processing as described above is repeated every time a program selection signal is obtained from the control signal.

The flow of (II) is shown in FIG.

In the above-described embodiment, the preset contents can specify A and B, but only B may be used, and in this case, the circuits (26), (27), (30), etc. are unnecessary.

(G) Effects of the Invention As is clear from the above description, the present invention makes it possible to stand by and receive all programs on a reserved channel in a reserved time slot with a simple operation. Therefore, for conventional standby reception, it is no longer necessary to reserve the number of programs, and for all receptions, the operation to set the reception standby state and reception is completed before the desired program starts. After that, there is no need to perform any operation to stop it.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a facsimile broadcast receiving device according to an embodiment of the present invention, FIG. 2 is a block diagram of a facsimile broadcast transmitting device, FIG. 3 is a flow diagram of an embodiment of the present invention, and FIG.
Figure (a) is a schematic diagram showing the frame structure of a facsimile signal in facsimile broadcasting, Figure 4 (b) is a schematic diagram showing the packet structure of a facsimile signal in facsimile broadcasting, and Figure 5 is a diagram showing the time sequence of the facsimile signal. It is. (21)...Tuner, (28)...Picture reception processing circuit, (30)...Next exit time extraction circuit, (31)...
・Key operation unit, (32)...control unit, (33)...
storage section

Claims (1)

[Claims] 1. In a facsimile broadcast receiving device that receives a facsimile signal multiplexed with broadcast radio waves and transmitted, means for presetting and reserving a time zone and channel;
A facsimile broadcast receiving apparatus comprising: a storage section for storing the contents of the preset; and means for receiving all programs of the channel in the time period stored in the storage section. 2. The facsimile broadcast receiving apparatus according to claim 1, wherein the storage section stores a plurality of preset contents.