JP2002094892A - Digital broadcast receiving system and digital broadcast receiver to be used for the same and external recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast receiving system capable of confirming the status of a receiver such as the broadcasting station name or program name of recorded data at the time of recording data from the receiver in an external device, and detecting the change of the status of the receiver at the external device side even when the status of the receiver is changed during recording, and recording the data for each kind of the data as different files. SOLUTION: A receiver outputs the status data of program data prior to the output of the program data, and even when the program data to be outputted is changed, outputs the status data of the changed program data, and then outputs the program data. Also, an external device records the status data and program data outputted from the receiver in different files, and records the program data transmitted after the status data are outputted in another file by further discriminating the program data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiving system comprising a digital broadcast receiver for receiving a digital broadcast, and an external device connected to the digital broadcast receiver for reproducing or storing data from the receiver. is there.

[0002]

2. Description of the Related Art Various programs composed of video, audio, text, and the like can be converted into digital data and distributed to homes through various transmission paths such as terrestrial waves, satellite waves, and cables (cable broadcasting). With this digitization, the number of program channels that can be selected by viewers has been significantly increased. For example, digital audio satellite broadcasting is a multi-channel broadcasting in which audio data of each channel is multiplexed in a TDM (time division multiplexing) system, QPSK modulated, and then delivered to each home as one satellite broadcast wave. A desired channel can be selected from many channels by a receiver installed at home (see, for example, JP-A-11-146379).

[0003] In digital audio satellite broadcasting mainly of such audio programs, not only audio but also various data such as video (or images) and characters are multiplexed and broadcast.

[0004]

However, in a digital broadcast receiver, when the cost of the receiver is prevented from increasing or when a new data broadcast service is provided in the future,
In order to be able to support a new data broadcasting service by an external device without changing the receiver main body, only a processing function of reproducing one (or a limited number) of various multiplexed data is provided, and processing is performed. Data that cannot be (reproduced) can be output to an external device so that processing such as reproduction can be performed by the external device. For example,
2. Description of the Related Art A receiver for receiving a digital broadcast mainly including an audio program includes an audio data decoding function and an amplifier and a speaker for audio reproduction, and outputs data such as image data and character (text) data to an external device. It has a configuration.

In such a digital broadcast receiving system in which a digital broadcast receiver and an external device are combined, a receiver selects a receiving broadcast station or a program, and outputs data to the external device based on the selection. You. Generally, on the external device side, processing of input data (for example, processing of image data) is performed. Therefore, on the external device side, the reception status of the receiver (selected broadcasting station or program, or program The channel selection state such as type; hereinafter referred to as status) is unknown. When the data from the receiver is played back on an external device and the status is changed, such as when the program selected on the receiver is changed while the user is watching it, the status is changed. Can be recognized by the user, but when the data from the receiver is automatically recorded in the external device, the external device cannot detect the status change. For this reason, a plurality of different programs (different types of data) are recorded as one program (data) in the external device, and there is a possibility that appropriate reproduction cannot be performed after the recording. Also, since the data output from the receiver is content data such as audio, image, video, and text, there is an inconvenience that it is not possible to know which program of which broadcasting station was recorded by looking at the data recorded by the external device. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when data from a receiver is to be recorded by an external device, reception of which broadcast station or what program the recorded data was is performed. It is possible to check the status of the device, and even if the status of the receiver changes during recording, the change in the status can be detected by the external device and recorded as a separate file for each data type It is an object of the present invention to provide a digital broadcast receiving system capable of performing the above, and a digital broadcast receiver and an external device used for the digital broadcast receiving system.

[0007]

According to a first aspect of the present invention, there is provided a digital broadcast receiving system for receiving a signal in which a plurality of program data are multiplexed, and transmitting at least one of the multiplexed program data. A receiver for selectively outputting, and an external device capable of recording program data output from the receiver on a recording medium, wherein the receiver creates status data indicating channel selection information of the output program data. Status data generating means for outputting, when outputting the program data, status data of the program data to be output prior to the output of the program data, and when the output program data is changed, the status data of the changed program data is output. After the output, the changed program data is output.

According to a second aspect of the present invention, in the digital broadcast receiving system according to the first aspect, when the external device records program data output from the receiver,
The status data of the program data to be recorded is also recorded.

According to a third aspect of the present invention, in the digital broadcast receiving system according to the first or second aspect, the external device transmits the status data from the receiver while recording the program data output from the receiver. Is detected, the program data output after the status data is recorded separately from the previously recorded program data.

According to a fourth aspect of the present invention, in the digital broadcast receiving system according to any one of the first to third aspects, the program data and status data output from the receiver are transmitted to the external device via the same communication line. Is output to.

According to a fifth aspect of the present invention, in the digital broadcast receiving system according to any one of the first to fourth aspects, the receiver reproduces and outputs program data composed of audio data among the multiplexed program data. It is characterized by comprising a voice reproducing means for performing the following.

According to a sixth aspect of the present invention, in the digital broadcast receiving system according to any one of the first to fifth aspects, the external device includes a display means, and displays the status data of the recorded program data. The status of the receiver based on the received information is displayed by the display means.

According to a seventh aspect of the present invention, there is provided a digital broadcast receiver capable of receiving a signal in which a plurality of program data are multiplexed and recording at least one of the multiplexed program data on a recording medium. A digital broadcast receiver for selectively outputting to an external device, comprising: status data generating means for generating status data indicating channel selection information of program data to be output; The data is output prior to the output of the program data, and when the program data to be output is changed, the changed program data is output after outputting the status data of the changed program data.

According to an eighth aspect of the present invention, in the digital broadcast receiver according to the seventh aspect of the present invention, the digital broadcast receiver further comprises an audio reproducing means for reproducing and outputting program data comprising audio data among the multiplexed program data. Features.

According to a ninth aspect of the present invention, an external recording device comprises:
When receiving a signal in which a plurality of program data are multiplexed and selectively outputting at least one of the multiplexed program data, status data of the program data to be output is output prior to the output of the program data. When the program data to be output is changed, the status data of the changed program data is output, and then connected to a receiver that outputs the changed program data, and the program data output from the receiver is output. An external recording device that can be recorded on a recording medium, and when recording program data output from a receiver,
The status data of the program data to be recorded is also recorded.

According to a tenth aspect of the present invention, the external recording device according to the ninth aspect detects that status data has been output from the receiver while recording the program data output from the receiver. Then, the program data output after the status data is recorded separately from the previously recorded program data.

According to an eleventh aspect of the present invention, in the external recording device according to the ninth or tenth aspect, the external recording device further comprises a display means, and displays the status of the receiver based on status data of recorded program data. It is characterized by displaying by means.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a digital broadcast receiving system according to the present invention will be described below with reference to the drawings.

FIG. 2 shows an example of a format in one broadcast carrier in which data from a plurality of broadcasting stations are multiplexed by a time division multiplexing (TDM) method. TD
In the multiplexing by the M system, a TDM frame serving as a basic cycle of transmission and reception is determined, and data of each broadcasting station is assigned to a fixed time interval (time slot) in the TDM frame. And a plurality of time slots (1 to n). The synchronization signal is provided at the beginning of the TDM frame for frame synchronization, and the TDM header includes n ID numbers corresponding to n time slots. Each time slot includes data of a predetermined number of bits, and one broadcasting station uses one or a plurality of time slots.
TD corresponding to time slot used by one broadcasting station
The same number is assigned to the ID number in the M header, and the time slot used by each broadcasting station is determined based on the ID number.

For example, when data of three broadcasting stations A, B, and C are multiplexed in a TDM frame, when the broadcasting station A is selected, an ID number corresponding to the broadcasting station A is searched for in the TDM header. , The data of the time slot corresponding to the position of the corresponding ID number is synthesized in time series, and a series of data (BC data) of the broadcasting station A is obtained.

FIG. 3 shows an example of a format of a series of data (hereinafter referred to as BC data) in one broadcasting station. A plurality of program data (for example, audio data and image data) are multiplexed. In the BC data as well, each program data is multiplexed by TDM, a BC frame as a basic cycle of transmission and reception is determined, and individual program data is allocated to a fixed time interval (time slot) in the BC frame. Each BC frame is composed of a synchronization signal, a BC header, and a plurality of time slots for synchronizing frames at the beginning. When the number of programs is m, m
Timeslots are included. The BC header includes information indicating a broadcast station name, the number m of programs, and a data type (PTY; program type) of m individual programs. As PTY, programs are news, music,
It may indicate a genre such as speech or drama, or indicate a data type such as MPEG audio data, video data, image data, or text data, and may include language data indicating a language used. Further, the BC header may include time data relating to the broadcast date and time, data indicating the state of the scramble processing and the transmission bit rate.

FIG. 1 is a schematic block diagram of an embodiment of a digital broadcast receiving system according to the present invention which includes a receiver and an external device.

1 is a control circuit for controlling the entire receiver, 2
Is an antenna adapted to the broadcast carrier frequency band, 3 is a tuner for selecting a signal of the broadcast carrier frequency selected from the received signal from the antenna 2 under the control of the control circuit 1 and converting it to an intermediate frequency (IF) signal. This is a phase demodulator that converts an IF signal from the tuner 3 into a baseband signal and outputs it as TDM data.

5 extracts, from the TDM data, the data of the time slot of the ID number corresponding to the selected broadcasting station, synthesizes the data, and combines the BC data of one selected broadcasting station under the control of the control circuit 1. This is a channel decoder for outputting. Reference numeral 6 denotes a first program data demultiplexer for extracting and outputting audio program data designated by the control circuit 1 from the BC data output from the channel decoder 5 based on the BC header, and 7 an output from the first program data demultiplexer 6. An audio decoder for decoding the audio program data, a DA converter 8 for converting the audio data decoded by the audio decoder 7 into an analog signal, and a DA converter 8
An amplifier 10 for amplifying the analog signal output from the amplifier 10 is a speaker for outputting the analog signal amplified by the amplifier 9 as sound. Note that the audio reproducing means is not limited to this, but in the present embodiment, is constituted by an audio decoder 7, a DA converter 8, an amplifier 9, and a speaker 10.

Reference numeral 11 denotes a second program data demultiplexer for receiving BC data from the channel decoder 5 and extracting and outputting program data specified by the control circuit 1 from the m pieces of program data based on the BC header. Program data, which is data, is output.

Reference numeral 12 denotes a data interface for connecting a receiver and an external device via a communication line. The data interface 12 includes program data (image data in this embodiment) output from the second program data demultiplexer 11 and program data to be output. Status data output from the control circuit 1 functioning as status data generating means for generating status data indicating channel selection information is converted into a format that can be received by an external device, and is switched and output.

Reference numeral 13 denotes a channel selection UP switch and a channel selection DOWN switch for selecting a broadcasting station, an audio program selection switch for selecting an audio program to be reproduced by the receiver, and a reproduction program for reproducing the selected audio program. An operation panel provided with an audio volume for volume control, an image program selection switch for selecting a program of program data to be output to an external device, an LCD panel 14 having an LCD panel, and displaying the status of the receiver It is a vessel. The status of the receiver includes the ID number of the selected broadcasting station, the name of the broadcasting station, the number of programs m, the program number and PTY of the audio program decoded by the receiver, and the program output to the external device. Are displayed, but it is not necessary to display all of them, and the present invention is not limited to these.

Next, the configuration of the external device will be described. 2
Reference numeral 1 denotes a CPU that controls the entire external device, 22 denotes an operation unit having a plurality of key switches for the user to issue an operation instruction to the CPU 21, and 23 denotes a communication line for transmitting program data output from the receiver. A data interface input through the data interface 24; a recording unit provided with a recording medium for recording program data from the data interface 23 under the control of the CPU 21; 25 a program data input from the data interface 23; An image decoder for decoding image data of the program data;
Reference numeral 26 denotes a display for displaying an image based on the image data decoded by the image decoder 25. Incidentally, the recording unit may be a recording medium using a replaceable recording medium such as a magneto-optical disk, a fixed hard disk, or a semiconductor memory (in this embodiment, recording and storage are used in the same sense). That can be done).

FIG. 4 shows an example of the format of data (including the selected program data (image data)) output from the receiver to the external device. The data has a frame structure, and the frame data includes status data output from the control circuit 1 or selected program data (image data) output from the second program data demultiplexer 11. An identification signal indicating the data content of the frame is added to the head by the data interface 12 of the receiver.
The identification signal is also composed of specific data or a signal. There are two types of identification signal 1 and identification signal 2. Identification signal 1 is added as program data (image data), and identification signal 2 is added as status data. Is done. The status data output at this time includes, but is not limited to, a broadcast station ID number, a broadcast station name, a program number of a program output to an external device, and its PTY. Not something.

In such a system, when a desired broadcast station and a desired program are selected by operating switches on the operation panel 13 of the receiver, the control circuit 1 causes the tuner 3 to broadcast the broadcast of the corresponding broadcast station. A signal of a carrier frequency is selected from a signal received from the antenna 2 and converted into an intermediate frequency (IF) signal. The IF signal from the tuner 3 is transmitted to the phase demodulator 4
Is converted into a baseband signal and output as TDM data. The BC data of one broadcasting station selected by the channel decoder 5 is output and supplied to the first program data demultiplexer 6 and the second program data demultiplexer 11. You.

The first program data demultiplexer 6 converts the audio program data selected under the control of the control circuit 1 into B
The audio program data extracted based on the C header is decoded by the audio decoder 7, input to the speaker 10 via the DA converter 8 and the amplifier 9, and the audio program is reproduced and output from the speaker 10. .

The second program data demultiplexer 1
In step 1, under the control of the control circuit 1, the selected program data (image data) is extracted based on the BC header.
Output to the data interface 12. At this time, the status data of the program data (image data) selected from the control circuit 1 is also input to the data interface 12, and the data interface 12 converts the data into a frame before transmitting the program data (image data). To send status data.

Program data (image data, for example, image A)
When the program to be output to the external device is changed (for example, the image is changed to an image B) by operating the operation panel 13 during the transmission of the program, the control circuit 1 changes the second program data demultiplexer in accordance with the change. 11 is instructed to retrieve the program data of the image B. Further, the control circuit 1 sends the changed program data (image data;
The status data of the image B) is output, and the status data of the program is transmitted prior to the transmission of the program data of the image B. Then, following the transmission of the status data, the program data of the image B is transmitted. When transmitting the status data and the program data, a predetermined identification signal is added to the head of each frame.

Even if the program data to be sent to the external device is changed, if the selection of the audio program is not changed, the audio reproduction from the speaker 10 is continued without interruption.

On the other hand, in the external device, program data (image data) input by operating the operation unit 22 is reproduced or recorded (in some cases automatically).
Here, it is assumed that the recording process is set prior to the transmission of the program data from the receiver.

When the frame data is input to the interface 23, the CPU 21 detects what data the contents of the frame are based on the identification signal added to the head of the frame. As shown in FIG. 4, an identification signal 2 is added to the head of the first transmitted frame, the data of the frame is determined to be status data, and the received status data is recorded as one file. The recording is performed by the unit 24. An identification signal 1 is added to the head of a subsequently transmitted frame, and it is determined that the data of the frame is program data (image data; for example, image A), and the recording unit 24 separates the data from the status data. In a file. Since the identification signal 1 is also attached to the head of the next transmitted frame, the CPU 21 determines that the data of the frame is program data (image data), Image data; Image A)
Is recorded in the same file as the continuation data of the file. When the identification signal added to the head of each frame transmitted thereafter is the identification signal 1, the program data (image data) is recorded following the same file (the file of the image A) in the recording unit 24. . The correspondence (association) between the program data and the status data of the program data is made, for example, by using the same file name and making the extension suitable for each file type.

When the program data (image data) output to the external device is changed in the receiver, as described above,
Before sending the changed program data (image data of image B), frame data including status data of image B is sent. When the CPU 21 detects that the identification signal at the beginning of the frame is the identification signal 2, the CPU 21 determines that the data of the frame is status data, and uses the received status data as still another file as the recording unit 2.
Record in 4. Then, the data of the identification signal 1 is added to the head of the subsequently transmitted frame. It is determined that the data of the frame is program data (image data). Since the status has been received immediately before and the status has changed, the recording unit is different from the file in which the status data is recorded and another file (the image B file) different from the previously recorded program data (the image data of the image A). 24. Further, since the identification signal 1 is added to the head of the subsequently transmitted frame, the CPU 21 determines that the data of the frame is program data (image data), and determines that the data of the previously recorded program data (image data). Image data: The same data (file of image B) is recorded as subsequent data of the file of image B). Thereafter, as long as the identification signal added to the head of each transmitted frame is the identification signal 1, the recording of the program data (image data) is continued after the same file (file of the image B) in the recording unit 24. Do.

Thus, when program data output from the receiver is stored in an external device while the program data output from the receiver is changed in the middle of the storage, new status data is output by the identification signal. Output is detected,
New status data and subsequent program data are recorded in separate files. Therefore, a plurality of pieces of program data of different data types are not recorded in one file, so that it is possible to avoid that the file cannot be reproduced after recording. Further, since status data is also recorded in another file in correspondence with the program data, it is possible to know what data file the program data file is after recording.

It should be noted that the external device, during the recording of the program data,
A configuration may be provided in which status data corresponding to the recorded program data is displayed on the display 26 or a display panel for status display (not shown). By performing display based on the status data received by the external device, the status of the receiver can be displayed, whereby the program output from the receiver (that is, the program data recorded by the external device) can be displayed by the user. Since the determination can be made, the desired program can be recorded without making a mistake.

In this embodiment, the status data and the program data transmitted from the receiver to the external device are transmitted on the same communication line, and the discrimination is made by the identification signal. Since it is not necessary to provide a dedicated communication line, the number of connection terminals in the connection interface can be reduced, and the cost can be further reduced.

[0041]

According to the present invention, as apparent from the above description, the receiver outputs the status data of the program data prior to the output of the program data. After outputting the status data of the changed program data, the changed program data is output, and the external device records the status data and the program data output from the receiver in separate files, Further, the program data sent after the status data is output is further distinguished and recorded in another file. As a result, a plurality of pieces of program data of different data types are not recorded in one file, and it is possible to avoid that the file cannot be reproduced after recording. Further, since status data is also recorded in another file in correspondence with the program data, it is possible to know what data file the program data file is after recording.

Further, by performing display based on the status data received by the external device, the status of the receiver can be displayed, whereby the program output from the receiver (that is, the program recorded by the external device) can be displayed. data)
Can be determined by the user, and a desired program can be recorded without making a mistake.

Also, since the status data and the program data sent from the receiver to the external device are sent on the same communication line, there is no need to provide a dedicated communication line for status data and program data, and the connection And the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a digital broadcast receiving system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a format when data from a plurality of broadcast stations are multiplexed on one broadcast carrier by a time division multiplexing (TDM) method.

FIG. 3 is a diagram showing an example of a format when multiplexing a plurality of program data.

FIG. 4 is a diagram illustrating an example of a format of (data) output from a receiver to an external device according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 control circuit 2 antenna 3 tuner 4 phase demodulator 5 channel decoder 6 first program data demultiplexer 7 audio decoder 8 DA converter 9 amplifier 10 speaker 11 second program data demultiplexer 12 data interface 13 operation panel 14 LCD display 21 CPU 22 operation unit 23 data interface 24 recording unit 25 image decoder 26 display

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/765 H04N 5/91 LF term (Reference) 5C025 CA02 CA09 CB05 CB08 DA01 DA04 DA05 5C053 FA20 FA21 FA23 FA27 GB06 GB11 GB37 GB38 HA29 JA03 JA07 JA16 JA21 KA08 KA24 LA06 LA15 5K028 AA00 BB04 CC05 DD01 DD02 EE08 FF13 KK03 MM08 5K061 AA03 AA09 BB06 BB19 CC00 DD00 FF01 FF12 GG09 JJ06 JJ07

Claims (11)

[Claims] 1. A receiver for receiving a signal in which a plurality of program data are multiplexed and selectively outputting at least one of the multiplexed program data, and a program data output from the receiver. An external device recordable on a recording medium, the receiver includes status data creating means for creating status data indicating channel selection information of the program data to be output, and when outputting the program data, A digital data output section that outputs status data prior to the output of the program data, and outputs the changed program data after outputting the status data of the changed program data when the output program data is changed. Broadcast receiving system. 2. The digital broadcast receiving system according to claim 1, wherein when recording the program data output from the receiver, the external device also records status data of the program data to be recorded. 3. When the external device detects that status data is output from the receiver while recording the program data output from the receiver, the external device records the program data output after the status data first. 3. The digital broadcast receiving system according to claim 1, wherein the program data is recorded separately from the program data. 4. The digital broadcast receiving system according to claim 1, wherein the program data and status data output from the receiver are output to an external device through the same communication line. 5. The digital broadcast receiving system according to claim 1, wherein the receiver includes audio reproducing means for reproducing and outputting program data composed of audio data among the multiplexed program data. . 6. The external device according to claim 1, further comprising a display unit, wherein the display unit displays the status of the receiver based on the status data of the recorded program data. The digital broadcast receiving system according to the above. 7. A digital broadcast receiver for receiving a signal in which a plurality of program data is multiplexed and selectively outputting at least one of the multiplexed program data to an external device capable of recording on a recording medium. Wherein status data generating means for generating status data indicating channel selection information of the program data to be output is provided, and when outputting the program data, the status data of the program data to be output is output and output prior to the output of the program data. When the program data is changed, a digital broadcast receiver outputs status data of the changed program data and then outputs the changed program data. 8. The digital broadcast receiver according to claim 7, further comprising audio reproducing means for reproducing and outputting program data comprising audio data among the multiplexed program data. 9. When receiving a signal in which a plurality of pieces of program data are multiplexed and selectively outputting at least one of the multiplexed program data, status data of the program data to be output is changed to program data. When the program data to be output is changed prior to the output of the program data, the status data of the changed program data is output, and then the receiver is connected to a receiver that outputs the changed program data, and is output from the receiver. An external recording device capable of recording recorded program data on a recording medium, wherein when recording program data output from a receiver, the external recording device also records status data of the program data to be recorded. 10. When recording of status data from a receiver is detected during recording of program data output from the receiver, the program data output after the status data is recorded first. The external recording device according to claim 9, wherein the recording is performed separately from data. 11. The apparatus according to claim 9, further comprising display means for displaying the status of the receiver based on the status data of the recorded program data by said display means.
Or the external recording device according to 10.