JPH03248665A - Facsimile broadcast receiver - Google Patents

Abstract

PURPOSE:To deal with a case where a wrong time zone is preset by awaiting and receiving a signal on the basis of a channel and a program number during the idle time of a device. CONSTITUTION:A control part 32 sets a tuner 21 to the prescribed channel at reserved time, and obtains a facsimile signal. This signal is separated 23 into an MC part and a data packet part, and in the case of a facsimile broadcast, after error correction, the contents of a prefix is discriminated, and a data packet is separated 25 into a picture signal and a control signal. Then, the program number is extracted 30 from the control signal, and is compared 27 with the reserved program number, and when the both are coincident, the picture signal is processed for demodulation 28, and the picture signal is sent to a printer 29. Besides, when the program number can not be detected until scheduled time, the preset contents are stored 33, and the program number is awaited until the reservation starting time of the preset content of next reserved reception.

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, deliberations are underway at the Telecommunications Technology Council with the aim of commercializing 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. . The contents of this facsimile broadcasting service include, for example:
In addition to program content and text related to broadcast programs, there is a wide variety of information such as stock market conditions, news, tourist information, and specialized information by occupation.

This facsimile broadcasting transmission method uses a method in which subcarriers obtained by modulating facsimile signals are frequency-division multiplexed onto audio signals, which are FM-modulated onto audio carrier waves and then transmitted.

To give an overview of this method, the center frequency of the subcarrier is 4.5 FA (70,804 KHz; the horizontal synchronization pulse frequency of FM' television), and the facsimile signal is modulated onto this using a 4-phase differential phase modulation method. Ru.

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 7-ohm 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 the original image signal into M H (Modi
dHaffman) and M R (Modified RE
The signal is encoded using a redundancy reduction encoding method called AD) and then added with a control code such as a line synchronization code.

The facsimile signal is sent out according to the time sequence shown in FIG. A facsimile broadcast program consists of one or more pages. A program selection signal is attached to the beginning of the image signal of each member of each program, and the signal is sent out. The program selection signal is
It contains identification information such as the program number and page number of the image signal that follows, and the encoding method used, and six frames are sent to each participant. Also, for each frame,
It is only necessary to send a program selection signal for at least 3 of the 32 packets, and the remaining packets can be used to provide supplementary information related to facsimile broadcasting, such as a program index, and to exit the service. 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 reception channel number, 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 receiving device sets the reserved channel, detects the program selection signal while receiving the facsimile signal, and matches the program number included in the program selection signal to the reserved desired program number. It is determined whether they match, and if they are the same, standby reception is performed by printing out the image signal of the received program.

(c) Problems to be Solved by the Invention In the conventional facsimile broadcast reception operation, standby reception must be preset by an operator. Therefore, there is a possibility that an incorrect time zone may be preset, and there is a possibility that the desired facsimile broadcast cannot be received.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a facsimile broadcast receiving apparatus that takes into account the case where an incorrect time zone is preset.

(d) Means for Solving the Problems The present invention provides means for presetting a time zone, channel, and program number and reserving a program in a facsimile broadcast receiving device that receives facsimile signals multiplexed with broadcast radio waves and transmitted. , a storage unit that stores the contents of the preset;
means for performing standby reception based on the contents of the storage unit;
If standby reception cannot be performed based on the contents of the storage unit, then standby reception is performed based on the channel and program number during the idle time of the device? A facsimile broadcast receiving apparatus is characterized by comprising: - means.

(e) Effects According to the present invention, standby reception can be performed based on the channel and program number reserved during the facsimile receiving device's free time.

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

FIG. 2 shows a facsimile broadcast transmitting device, in which (2) is a scanning circuit that scans the screen (1) and generates an image signal;
This image signal is converted to MH'? by the encoding circuit (3). The signal is encoded using 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 transmission 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 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 broadcast radio waves 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 that receives broadcast radio waves of a reserved channel from a control circuit (32) and extracts an audio carrier wave. , and further outputs a composite signal with voice including a facsimile signal by FM demodulation. A demodulator (22) extracts the subcarrier of the facsimile signal from the composite signal, demodulates the four-phase differential phase modulation signal, and outputs the facsimile signal. The facsimile signal demodulated in this demodulator (22) is further processed by a signal separation circuit (22).
In step 3), frame synchronization is achieved and signal packets are separated into an MC section and a data packet section. After error correction by BCH, the MC section identifies whether or not it is a facsimile broadcast in the MC section identification circuit (24), and in the case of a facsimile broadcast, the content of the data packet is determined to be valid and an instruction is given to the separation circuit (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 image receiving processing circuit (28) calculates the number of pixels in one line for the line information obtained through decoding processing, determines whether it matches a predetermined value (for example, 1728 pixels for A4 size), and determines whether the received It is possible to determine whether an error has occurred in the image signal.

(30) extracts the next exit time information included in the program selection signal. (31) is a key operation section, and by key-in operation, the receiver inputs the program number, channel number, and reception time slot that the receiver desires to receive, and performs a presetting operation. (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 stores the contents preset in the storage unit (33) at the reservation start time. Then, a channel control signal is output to the tuner (21) to control the tuner (21) to set it to the reserved reception channel.

Below, from the key operation section (31), program number channel number reception time zone A
1 7:10-8200...(i)B
3 9:30-10:00...(i
)CI 1C00-12:00...(iii
) The reception operation when performing the three preset operations will be explained in detail based on FIG. 3.

In the facsimile receiving device, the control unit (32) causes the key control unit (31) to control the tuner (21) when the reserved time (7:10) arrives based on the preset content (i).
) and set it to a predetermined reception channel (channel 1) to obtain a facsimile signal.

The facsimile signal is further frame-synchronized by a signal separation circuit (23) and separated into signal packets of an MC section and a data packet section. The MC part is identified by the MC part identification circuit (24).
After error correction by the CH, 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. The program number is extracted from the control signal by the extraction circuit (30) and compared with the reserved program number (A) by the comparison circuit (27). If they match, the image signal of this program number is subjected to image reception processing. The circuit (28) performs decoding processing using the MHJc3MR method, and the decoded image signal is sent to the printer (28).
9), but in this example,
Assume that the program number (A) cannot be detected by S:OO.

In this case, the preset content (i) is held in the storage unit (33), and the program number (A) is waited for until the reservation start time (9:30) of the preset content (i) for the next reservation reception. If number (A) is detected, it is printed out.

Furthermore, in this embodiment, by 9:30, the program number (A)
Suppose that it cannot be detected. In this case, the contents of the preset (
Based on i), when the reservation start time (9:30) arrives, the tuner (21) is controlled and set to a predetermined receiving channel (channel 3) to obtain a facsimile signal. The facsimile signal is further frame-synchronized by a signal separation circuit 3) and separated into signal packets of an MC section and a data packet section. BCH the MC section using the MC section identification circuit (24)
After error correction, 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 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. The extraction circuit (30) extracts the program number from the control signal, and the comparison circuit (27) extracts the reserved program number (B
), the image reception processing circuit (28) performs MH or MR decoding processing on the image signal of the matching program number, and the decoded image signal is printed out by the printer (29).

Reservation reception based on preset content (i) ends (9:
50) Then, the preset contents (
ii), and at this point, the preset content (i) is still held in the storage unit (33), so the next scheduled reception (preset content ( The program number (A) is awaited until the reservation start time (11:00) in ii).

However, in this embodiment, the program number (A
), the tuner (
21) and set it to a predetermined receiving channel (channel 1) to obtain a facsimile signal. This facsimile signal is further subjected to frame synchronization in a signal separation circuit (23) and separated into signal packets of an MC section and a data packet section. BCH the MC section using the MC section identification circuit (24)
After error correction, 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 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. The program number is extracted from the control signal by the extraction circuit (30), and the reserved program number (C
), and if they match, the image reception processing circuit (28) performs MH or MR decoding processing on the image signal of this program number, and the decoded image signal is printed out by the printer (29). However, in this example, 12:0
Assume that the program number (C) cannot be detected by 0. In this case, the preset contents (iii) are retained in the storage section (33) and the program numbers (A and C) are retained until the next reserved reception time.
When the program number (A or C) is detected, it is printed out.

For example, if the reserved reception based on the preset content (ii) ends first, the preset content (iii) will be deleted from the storage unit (33) and the reception will be continued until the next reservation start time.
Waiting for program number (A).

As mentioned above, in the facsimile broadcast receiving apparatus of the present invention,
If standby reception based on the reserved reception time slot, channel, and program number is not possible, the facsimile broadcast receiving device is free during the free time (from 8:00 in the above example).
9:30.10:00-11:00.12:00~)
As long as the facsimile broadcast of the reserved program number is broadcast during a free time, the facsimile broadcast of the reserved program number can be received.

In the above embodiment, two preset contents are held in the storage section (33) and the channel numbers are the same, but the number of preset contents is arbitrary, and if the channels are different, It is sufficient to follow a predetermined priority order. The priority order is to process the contents of the oldest presets first, or to divide the contents of the presets held in the storage unit (33) into groups for each channel, and to process the contents of the presets in descending order of the number of preset contents. It may be possible to process the problem. Further, it is preferable that the contents of a preset that does not end forever are erased from the storage unit (33) at an appropriate time (for example, when the date is changed, etc.).

(g) Effects of the Invention As is clear from the above explanation, even if the wrong time is preset for reservation reception, there is a possibility that reservation reception can be made during a free time, thereby avoiding a situation in which reception cannot be received at all. there's a possibility that. That is, it is possible to provide a facsimile broadcast receiving apparatus that takes measures to relieve preset errors.

[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, and FIG. 3 is a sequence diagram of an embodiment of the present invention.
FIG. 4(a) is a schematic diagram showing the frame structure of a facsimile signal in facsimile broadcasting, FIG. 4(b) is a schematic diagram showing the packet structure of a facsimile signal in facsimile broadcasting, and FIG. 5 is a schematic diagram showing the time sequence of the facsimile signal. FIG. (21)...Tuner, (28)...Picture reception processing circuit, (30)...Next transmission time extraction circuit, (31)...
・Key operation unit, (32)...control unit, (33)...
storage section

Claims (1)

[Scope of Claims] 1. In a facsimile broadcast receiving device that receives facsimile signals multiplexed with broadcast radio waves and sent out, means for presetting a time zone, channel, and program number to reserve a program, and a means for reserving a program by presetting a time zone, a channel, and a program number; a storage section for storing data; a means for performing standby reception based on the contents of the storage section; and a means for performing standby reception based on the contents of the storage section; What is claimed is: 1. A facsimile broadcast receiving apparatus, comprising: means for receiving facsimile broadcasts.