JP2889389B2 - Data broadcast receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data broadcast receiving apparatus, and more particularly to a means for confirming a reception status in a facsimile broadcast or a data broadcast.

[0002]

2. Description of the Related Art In recent years, a facsimile broadcasting system in which a facsimile channel using a second subcarrier is provided in an audio frequency band of a television broadcast wave and a facsimile signal is multiplexed and transmitted is being put into practical use. FIG. 4 is a diagram showing a baseband spectrum of a television sound to which the facsimile broadcast data is multiplexed. In addition to the main sound channel and the sub sound channel, a facsimile channel using a second subcarrier is provided. FIG. 5 is a diagram showing a configuration of a frame which is one transmission unit of a facsimile signal in a facsimile broadcasting system currently under development. The data part of one packet is 272
It consists of digital data of bits (34 bytes), a mode control (MC) code of 16 bits (2 bytes) is added at the head of this data part, and one packet is composed of 288 bits (36 bytes). ing. M
The C code is composed of information bits b1 to b5 and parity bits for error correction from b6 to b16. The data part is composed of information bits b1 to b190 and parity bits for error correction b191 to b272. Further, a frame is composed of 32 packets, and a frame synchronization signal (FC) of 16 bits (2 bytes) is added to the head of the frame. That is, one frame has 9232 bits (1154 bits).
Bytes). This one-frame data is a 16-bit (2-byte) frame synchronization signal (F
Subsequent to C), the data in the frame is output vertically one bit at a time (interleave processing). In addition, scrambling, in which data other than the frame synchronization signal is exclusively ORed with a pseudo-random signal (PN signal) sequence for each frame in order to impart randomness to the transmitted data and enable the receiver to reproduce the clock, on a frame-by-frame basis It is processed and sent. In a facsimile broadcast receiving apparatus that receives a facsimile broadcast in such a transmission form, first, the timing of a frame synchronization signal (FC) indicating the beginning of one frame is reliably detected, and a frame synchronized with the transmission side is obtained. The synchronizing signal is reproduced, the descrambling process and the deinterleaving process are performed, and the facsimile signal is fetched. FIG.
It is a figure showing data transmission of a page. A facsimile signal is basically composed of a control signal and an image signal. The control signal includes a network signal or blank signal of 6 frames, a program selection signal of 6 frames, and a page end signal of 3 packets or more. And a program end signal. Here, the 6-frame network signal is a signal for transmitting operation data between broadcast stations related to the network, all blank signals are zero data, and the receiving device does not need any special processing.
It is regarded as a signal inserted to secure operation time such as cutting of recording paper after print output (image reception). The program selection signal is a signal for transmitting information related to program selection on the receiver side, such as a program number and a page number. The page end signal is a signal indicating the end of the image signal for one page, and the program end signal is a signal indicating the end of the image signal of the last page of the program. In a facsimile broadcast receiving apparatus that receives such a facsimile signal, the program numbers of a plurality of programs desired to be printed out and, if necessary, page numbers are input to the facsimile broadcast receiving apparatus and registered in the reservation memory of the receiving apparatus. In the actual receiving operation, the program number and the page number included in the program selection signal of the transmitted facsimile signal and the page number, if necessary, are inputted in advance and registered in the reservation memory. And when they match, image signal sampling print output (image reception) is started and recording is performed. Then, the print recording is terminated by a page end signal or a program end signal, and the recording paper is cut manually or automatically. FIG. 7 is a diagram showing an example of the program transmission order. Unlike facsimile broadcasting, facsimile broadcasting does not mean that facsimile broadcasting programs are transmitted continuously. Also, it is not very meaningful to receive the program from the middle of the transmitted program. Therefore,
In a conventional facsimile broadcast receiving apparatus, a point or b
When the power is turned on at the point, the program receiving operation is started from the point c at which the next transmitted program B is received, and printing is performed.

[0003]

In such a facsimile broadcasting system, a facsimile broadcasting signal is not always transmitted. Naturally, when the signal of the facsimile broadcast is not being broadcast, the operation check of the facsimile broadcast receiver cannot be performed. Therefore, when installing a facsimile broadcast receiving apparatus, it may not be possible to determine whether or not a facsimile broadcast signal is being received correctly only by installing and wiring. Such a problem applies to other data broadcasting systems. The present invention has been made in view of the above points, and even when a program signal is not transmitted in a data broadcast such as a facsimile broadcast and the broadcast receiving device is not printing and recording, a regular frame synchronization signal and Assuming the transmission of all zero data from the mode control section and the data section, the reception status of data and signals by facsimile broadcasting is checked, and LE
It is an object of the present invention to provide a data broadcast receiving apparatus which can easily determine that data or a facsimile broadcast signal is correctly received by visually recognizing the data broadcast by D or the like.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a data storage device including an error detection code and an error correction code.
As well as interleaving by dividing the frame transmitting side data of a broadcast signal for each frame, and transmitting by adding frame same <br/> synchronization signal to the reception side, release the data to be transmitted
When there is no transmission signal, the frame synchronization signal is transmitted.
All bits of data following the frame synchronization signal
An apparatus for receiving a data broadcast in which the same value is transmitted and demodulating the received signal to perform a deinterleave process
Means for detecting that frame synchronization has been established from the deinterleaved received signal, a mode control section error correction means for error detection and correction of the mode control section, and a data section. a data unit error correction means for error detection and correction, the motor
Error correction means and data part error correction
And visual recognition means for displaying the content detected by the means. A facsimile broadcast receiving apparatus as an example of a data broadcast receiving apparatus includes a tuner that receives a television broadcast wave and selects a desired channel, and an error detection code and a tuner.
And data containing error correction code
Tally processing is performed and a frame synchronization signal is added.
Has been the frame same in the absence multiplexed facsimile signal and the facsimile signal to the television broadcast signal
Set the bits of the data part following the
Demodulating means for demodulating the multiplexed signal to the broadcast signal, the data capture to capture the frame synchronization reproducing means for reproducing the frame synchronization of the demodulated signal, a data descrambling process and the de-interleaving the demodulated signal Means, and the signal captured by the data capturing means.
Signal processing means for performing reception processing of the items, and decoding means for decoding the image signal to the pixel data extracted by said signal processing means, and recording means for printing out the pixel data, that the frame synchronization is established It has synchronous playback detection means for detecting, mode control section error correction means for detecting and correcting errors in the mode control section, and data section error correction means for detecting and correcting errors in the data section. Thus, a visual recognition means such as LED lighting is provided.

[0004]

According to the above arrangement, in a data broadcast such as a facsimile broadcast in which data or a program is not always broadcast, even when printout cannot be performed because the broadcast is not broadcast, the reception status of the broadcast signal can be seen at a glance. I can judge.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to facsimile broadcasting as an embodiment. FIG. 2 is a block diagram of the facsimile broadcast transmitting device 11 required for the present invention. In FIG. 1, reference numeral 12 denotes a facsimile broadcast image editing apparatus for inputting or editing an image to be broadcast by facsimile and performing MH (one-dimensional coding) or MR (two-dimensional coding) coding.
Reference numeral 13 denotes a facsimile modulator for multiplexing input data in a four-phase PSK mode for multiplexing the television data into a television audio signal, reference numeral 14 denotes an audio multiplex modulator for multiplexing a facsimile channel signal to a television audio signal, and reference numeral 15 denotes a television I / O from an audio signal and a video signal.
An IF modulator that outputs an F signal, 16 is an up-converter that converts a TV IF signal into a TV RF signal, 17 is a television audio generator, and 18 is a television video generator. The facsimile broadcast transmitting device 11 having such a configuration operates as follows. That is, first, an image to be broadcast by the facsimile broadcast image editing device 12 is created. The facsimile broadcast image editing apparatus 12 also includes a frame synchronization signal generating circuit, and performs interleave processing and scrabble processing on the control signal and the image signal in synchronization with the frame synchronization signal, and performs the facsimile modulation.
Output to 3. At this time, if there is no facsimile broadcast program, a frame synchronization signal is generated by a frame synchronization signal generation circuit, but the data is designed to be all zero. A facsimile channel signal output from the facsimile modulator 13 is multiplexed with a television audio signal by an audio multiplex modulator 14, becomes a television IF signal simultaneously with a video signal by an IF modulator 15, and is converted into a television RF signal by an up-converter 16. . The television RF signal is emitted from a television transmitting station. The generation of a frame synchronization signal and the insertion of zero data when facsimile broadcasting is not performed may be performed by the facsimile modulator 13.
Further, the configuration may be such that only the scramble processing and the interleave processing are performed by the facsimile modulator 13. In any case, the insertion of zero data must be performed before the interleaving process and the scrambling process. FIG. 1 is a block diagram of a facsimile broadcast receiving apparatus 1 according to one embodiment of the present invention. In the figure, reference numeral 2 denotes an antenna for receiving a television wave multiplexed with a facsimile signal, 3 a tuner for receiving a television broadcast wave and selecting a desired channel, 4 a demodulation unit for demodulating a facsimile signal, 5
Is a frame synchronous reproducing unit for reproducing the frame synchronous, 6 is a data capturing unit for descrambling and deinterleaving the demodulated facsimile signal and capturing the facsimile signal, and 7 is a signal processing unit. A mode control section error correction processing section 71 for detecting and correcting errors in the mode control section and a data section error correction processing section 72 for detecting and correcting errors in the data section are included. Further, it also includes a processing unit for performing signal processing such as processing for discriminating between a control signal including a program number and a page number and an image signal, and for performing a program reservation process. 8 is M
A decoding unit 9 for decoding the H or MR encoded image signal into pixel data, and a recording unit 9 for printing and outputting pixel data of a required program. Reference numeral 10 indicates the reception status at a glance by means of LED lighting or the like based on detection signals from an error correction processing unit 71 of a mode control unit and an error correction processing unit 72 of a data unit of the frame synchronization reproduction unit 5 and the signal processing unit 7. This is a possible reception status display unit. The facsimile broadcast receiving device 1 having such a configuration operates as follows. That is, first, a television wave in which a facsimile signal is multiplexed is received from the antenna 2, a television broadcast wave is received by the tuner 3, a desired channel is selected, and the facsimile channel signal is demodulated by the demodulation unit 4. The demodulated facsimile signal is sent to a frame synchronization reproduction unit 5 and a data acquisition unit 6, and the frame synchronization reproduction unit 5 reproduces a frame synchronization signal synchronized with the transmission side and outputs a frame synchronization reproduction detection signal. . On the other hand, based on the reproduced synchronizing signal, the data capturing unit 6 captures the facsimile signal by descrambling and deinterleaving the demodulated facsimile signal. The fetched facsimile data is error-corrected by the signal processing unit 7, and outputs error correction information of the mode control unit and error correction information of the data unit. When a facsimile broadcast program is transmitted, a program selection signal, which is a control signal transmitted prior to the image signal, is taken in, a program number, a page number, and the like are extracted therefrom and compared with the contents of the reservation memory. As a result of the comparison, if the program is a program reserved in advance, an image signal transmitted following the control signal is transferred to the decoding unit 8, and the MH code or the MR code is decoded into pixel data. The decoded pixel data is sent to the recording unit 9 and printed out (received). In order to perform the above-described operation, the facsimile broadcast receiving apparatus 1 includes a frame synchronous reproduction detecting means for detecting that the frame synchronous is being reproduced, instructs the frame synchronous reproducing section 5 to detect and correct an error of the mode control section. A mode control unit error correction unit 71 for performing the operation and a data unit error correction unit 72 for detecting and correcting an error in the data unit are provided in the signal processing unit 7. Displays the reception status of. Next, how the reception status can be determined based on these detection signals will be described in more detail. The error correcting parity code is added before the interleaving process and the scrambling process. As shown in FIG. 5B, the mode control unit MC is composed of 16 bits, and information bits b1 to b5 and b6 to b16
Up to error correction parity bits.
The code used for error correction in this mode control unit is B
CH (16,5). That is, the values of the information bits from b1 to b5 are sequentially calculated as a ₁ X ¹⁴ + a ₂ X ¹³ +... A ₅ X
The polynomial of each term from the upper ¹⁰ digits is used as a coefficient, and this polynomial is represented by a generator polynomial G (X) = X ¹⁰ + X ⁸ + X ⁵ + X ⁴ + X ² + X + 1. The remainder polynomial a ₆ X ⁹ + a ₇ X ⁸ +. The coefficient value of each term of a ₁₅ X ⁰ is used as a check code bit, and b6 to b1
It is to be a value up to 5. B16 is b
1 to b16 are determined to be even parity. According to this method, error correction of 3 bits or less of 16 bits and error detection of 4 bits can be performed. On the other hand, as shown in FIG. 5C, the data portion is composed of 272 bits, and is composed of information bits b1 to b190 and parity bits for error correction from b191 to b272. The code used for the error correction of this data part is a (272, 190) shortened difference set cyclic code that can be decoded by the majority logic circuit. That is, the values of the information bits from b1 to b190 are sequentially converted to the polynomial a ₂₇₁ X
²⁷¹ + a ₂₇₀ X ²⁷⁰ +... + A ₈₂ The coefficient value of each term from the upper digit of X ^{82 is used} as the coefficient value, and the above polynomial is further generated as a generation polynomial G.
(X) = ^X82 + ^X77 + ^X76 + ^X71 + ^X67 + ^X66 + ^X56 +
^{X 52 + X 48 + X 40} + X 36 + X 34 + X 24 + X 22 + X 18 + X
¹⁰ + X ⁴ +1 remainder polynomial divided by r ₈₁ X ⁸¹ + r ₈₀ X ⁸⁰
+... + R ₀ The coefficient value of each item of X ⁰ is used as a check code bit, and the values are sequentially from b191 to b272 from the upper digit. According to this method, error correction of an average of 11 bits out of 272 bits becomes possible. In the above error correction and error detection operation, when all the information bits b1 to b5 of the mode control unit MC are zero, b6
Also, the check code bits from to b15 are all zero.
Since b16 is determined to be an even parity, b1
When b15 is all zero, b16 is also zero.
That is, all the bits b1 to b16 of the mode control unit are zero, which is a normal code based on the error correction method. On the other hand, when the information bits b1 to b190 in the data portion are all zero, the check code bits b191 to b272 are all zero. That is, b1 to b1 of the data section
That b272 is all zero is a normal code based on the error correction method. After adding these parity for error correction, interleave processing and scramble processing are performed, so even if the data is zero data, it becomes a random signal at the time of transmission, and the clock can be reproduced at the receiver side, and the data can be safely reproduced at the receiver side. Can be captured. In the facsimile broadcast transmitting apparatus 11, when a facsimile broadcast program is not transmitted, all data following the frame synchronization signal is set to zero. At this time, both the mode control unit and the data unit use the error correction method adopted therein. The code is based on this. Therefore, in the facsimile broadcast receiving apparatus, by using the data of such an error correction method, the output of the error correction circuit 71 of the mode control section and the error correction circuit 72 of the data section are input to the frame synchronous reproduction detection signal. Received status display section 1
By inputting 0, it is possible to always check the state of the reception error. Furthermore, this error correction method can detect not only the presence or absence of an error but also the number of error bits in one packet. Therefore, as shown in FIG.
If the display status such as D is changed, the reception status can be confirmed more strictly. FIG. 3A shows an example of a display format using LEDs. 22 is a frame synchronous reproduction confirmation display unit, 23 is a mode control unit reception error status display unit, and 24 is a data unit reception error status display unit. The LED of the frame synchronization reproduction confirmation display section 22 is turned on when the frame synchronization reproduction detection means detects the reproduction of the frame synchronization. The mode control section reception error status display section 23 arranges, for example, four LEDs, detects the number of reception error bits of the mode control section by the mode control error correction processing section 71, and controls the display of the LEDs by the number of reception error bits. I do. As an example, when the number of received bit errors of the mode control unit is 0, four LEDs are lit, when one, three LEDs are lit, when two, two LEDs are lit, and when three, L is lit.
One ED is turned on, and when it is 4, no ED is turned on. FIG. 8A shows the relationship between the number of reception error bits of the mode control unit and the lighting of the LED. Similarly, the data part reception error status display part 24 arranges, for example, eight LEDs, detects the number of reception error bits of the data part by the data part error correction processing part 72, and displays the LED based on the number of reception bit errors. Control. FIG. 8B shows an example. These displays may be performed in packet units, averaged in frame units, or averaged in several frames. Since the facsimile broadcast program is not transmitted according to the display state of the reception status display section 10, the reception status of the facsimile broadcast can be determined at a glance even when the printout is not performed.
Further, by displaying the error status of the received bit in detail, it can be used for adjustment of an antenna and the like when the facsimile broadcast receiving apparatus is installed, and a reliable reception environment can be confirmed. Such confirmation of the broadcast reception state is not limited to facsimile broadcasting, but is a data broadcasting system in which data is divided into frames, a frame synchronization signal is added, and an error detection code or an error correction code is added to the data. Is also applicable.

[0006]

According to the data broadcast receiving apparatus of the present invention, the data and the program of the facsimile broadcast are not broadcasted in the broadcast in which the data and the program are not always broadcasted because of the above configuration. Even when printing is not being performed, the reception status of the broadcast can be determined at a glance by the visual recognition means such as by turning on the LED, etc. Significantly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a facsimile broadcast receiving apparatus according to the present invention.

FIG. 2 is a block diagram of a transmission device for the present invention.

FIG. 3 is a block diagram showing a mechanism for determining a reception status.

FIG. 4 is a baseband spectrum diagram of television sound.

FIG. 5 is a configuration diagram of one frame data of facsimile broadcasting.

FIG. 6 is a diagram showing an example of the transmission order of facsimile broadcast data for one page.

FIG. 7 is a diagram showing an example of a program transmission order in facsimile broadcasting.

FIG. 8 is an explanatory view of an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 facsimile broadcast receiving apparatus 2 antenna 3 tuner 4 demodulation unit 5 frame synchronization reproduction unit 6 data acquisition unit 7 signal processing unit 8 decoding unit 9 recording unit 10 reception status display unit 71 error correction processing unit of mode control unit 72 data error correction Processing unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 7/025-7/088 H04N 1/00 H04L 1/00-1/24

Claims (2)

(57) [Claims] 1. Data including an error detection code and an error correction code.
As well as interleaving by dividing the frame transmitting side data of a broadcast signal for each frame, and transmitting by adding frame same <br/> synchronization signal to the reception side, release the data to be transmitted
When there is no transmission signal, the frame synchronization signal is transmitted.
All bits of data following the frame synchronization signal
A data broadcast receiving means for transmitting the data broadcast with the same value of the signal, comprising means for demodulating the received signal and performing a deinterleaving process;
Synchronous playback detection means for detecting that frame synchronization has been established from the interleaved received signal, mode control error correction means for error detection and correction of the mode control section, and error detection and correction of the data section Data error correction means for mode and mode control
A data broadcast receiving apparatus comprising: a unit error correction unit; and a visual recognition unit that displays a content detected by the data unit error correction unit . 2. A tuner for receiving a television broadcast wave and selecting a desired channel, an error detection code and an error correction code.
Interleave every frame for data including positive sign
Facsimile signals and multiplexed in the processing frame synchronization signal is assigned with is performed by te <br/> revision broadcast signal
When there is no facsimile signal,
Set the bits of the following data part to the same value and
Demodulation means for demodulating a signal multiplexed on a transmission signal , frame synchronization reproduction means for reproducing frame synchronization of the demodulated signal , and data taking-in means for taking in data by descrambling and deinterleaving the demodulated signal Signal processing means for performing reception processing of the signal captured by the data capturing means; decoding means for decoding the image signal extracted by the signal processing means into pixel data; and recording means for printing and outputting the pixel data. , Synchronous reproduction detection means for detecting that frame synchronization has been established, mode control error correction means for detecting and correcting errors in the mode control section, and data section errors for detecting and correcting errors in the data section. Correction means and the mode control
A data broadcast receiving apparatus comprising: a visual recognition unit that displays a content detected by the data unit error correction unit and the data unit error correction unit .