JPH05284506A - Multimedium selector for satellite broadcast - Google Patents

Abstract

PURPOSE:To select multimedium information consisting of vido, audio, and digital data by receiving digital data, which is transmitted by using a digital data area, to guarantee a desired data quality and multiplexing data by an operation device interactive to a user. CONSTITUTION:The digital data area in a BS broadcast and satellite communication CS system is used to transmit digital data which the user can select. When this data is received on the reception side, decoded data is sent to a CPU 6. Required data is selected based on the operation of a multimedium select switch 163 on an operation input part 16, namely, user's selection. Selected data is sent to and stored in a memory 13 and is synthesized as an objective character or graphic picture signal. This picture signal is displayed together with a video signal separated by a synchronizing signal separating circuit 15 under the control of a tube face display processing part 14 driven by this video signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multimedia selector in satellite broadcasting or satellite communication.

[0002]

2. Description of the Related Art In Japan's satellite broadcasting (BS) system, 12 GHz radio waves in the SHF band are used.
It is M-modulated, and its baseband signal is as shown in FIG. Video signal is NT same as terrestrial broadcasting
Although it is the SC system, the maximum frequency is as wide as 4.5 MHz, and the audio signal is digitized by the PCM system, and then the audio subcarrier of about 5.73 MHz is phase-shifted and transmitted. The signals transmitted by the PCM method include an independent audio signal and an independent data signal in addition to a television audio signal.

This voice signal / data is a signal-multiplexed and bit-interleaved digital signal, and one frame consists of 2,048 bits and is transmitted 1,000 times per second. The first 16 in each frame
A frame sync of bits, a control code indicating the next 16-bit voice mode, coded voice / data information, and an error correction code (BCH) of 224 bits at the end are arranged. The frame structure differs depending on the two types of voice transmission modes.

As shown in the frame format in FIG. 2, the A mode has a 4-channel audio area and an independent data area of 480 Kbps. The B mode has a 2-channel audio area and an independent data area of 224 Kbps, as shown in the frame format of FIG.
Further, in the satellite communication (CS) system, similar signals are transmitted, but 160 Kbps is allocated as a control data area for transmitting scramble key data and the like, and 220 Kbps in A mode and 64 Kbps in B mode. An independent data area is provided. For example, FIG. 4 shows an example of a B-mode frame format, which includes shuffling data (SDA) and address data (ADR) for scrambling.
64Kbp optionally available following S)
It has s additional data (ADA) area.

[0005]

At present, these satellite broadcasting (BS) and satellite communication (CS) systems are used as unidirectional information media, and the user can select them as needed. That is, a user-selectable multimedia information transmission system has not been adopted,
There is a lack of user interactivity.
Therefore, an object of the present invention is to provide the satellite broadcasting system with user interactivity while maintaining compatibility with the conventional BS or CS transmission system.

[0006]

According to the present invention, user selectable digital data is transmitted using a digital data area in a BS broadcast or CS communication system, and the digital data is received by a receiving side. The desired data quality is assured, and the digital data is multiplexed by a user interactive operation means so that multimedia information including video, audio and digital data can be selected.

[0007]

The information and data required by the user can be selected and displayed by the operation means, and the interactive property can be introduced into satellite broadcasting or communication.

[0008]

EXAMPLES The present invention will be described below with reference to examples. First, the transmitting side transmits digital data such as character data and graphics data by using the independent data area in the voice / data area shown in FIG. 2 or 3.
FIG. 5 shows the structure of a data packet as an example of the data transmission format in that case. The definition of this packet is as follows.

(1) Header and Sync Signal The header defines what the following data, reserved code, ECC and EDC are, and serves as a packet format header. including. (2) Data area This area is specified for control and display of various ferri- fereral devices connected to the decoder, and * Feripheral address * Control information * Display data * Others are specified.

(3) Reserved word for expansion (RW) This is a reserved word for future expansion. (4) Error correction code (ECC) This is an error correction code for guaranteeing data quality including header, data, and reserved words. A suitable data quality is 10 ⁻¹² or more, and the byte error correction type ECC method is used.

(5) Error detection code (E
DC) An error detection code capable of detecting whether or not an error has occurred in information data including a header, a packet sync signal, data, a reserved word, and an ECC. Data reliability of control signals etc. is 10 ^-12 or more, and the error detection probability is 1/2.
It is necessary to use ³² or more error detection codes.

Next, an example of the configuration of the receiving side for the multimedia selector according to the present invention will be described. Figure 6
1 shows an embodiment in which the present invention is applied to a BS tuner for satellite broadcasting reception, 1 is a receiving antenna, 2 is a BS converter, and 100 is a BS tuner. BS tuner 100
Inside the, 3 is a channel selection / demodulation unit, 4 is 4.5 MHz
A video signal processing unit including an LPF, a de-emphasis circuit, a dispersal removal circuit, etc., 5.73 MHz BP
F, PSK demodulation circuit, audio signal processing unit including PCM demodulation circuit, 6 is a CPU (microcomputer) for various operations and controls, 7 to 11 are video outputs, VHF TV R
F output, bit stream signal, digital audio signal,
A voice output 16 is an operation input unit having a remote control sensor 161 and a key switch 162, and the above are components of a normal BS tuner.

In addition, according to the present invention, a multimedia selector decoder 12 for receiving the bit stream signal output 10 of the audio signal processing unit 5 and decoding the transmitted digital data, a memory 13, a screen. A display selector 14, a sync separation circuit 15, and a multimedia selector switch 163 as an operation input unit 16 are provided.

Various data packets inserted in the independent data area of the voice signal / data information are obtained in the bit stream output 9 of the PCM demodulation in the voice signal processing unit 5, and are supplied to the multimedia selector / decoder 12. It is added and decrypted there. In this case, the quality of the transmitted data is guaranteed by using the ECC and EDC described above. As examples of these data, character data translated into national languages of broadcast audio, information characters to designated persons, or graphic data can be considered.

The decrypted data is sent to the CPU 6, where the required data is selected based on the operation of the multimedia select switch 163 of the operation input unit 16, that is, the user's selection. The selected data is sent to and stored in the memory 13, and is synthesized as a target character or graphics image signal. This image signal is driven by the sync signal in the video signal separated by the sync signal separation circuit 15
Is added to the video signal under the control of and is displayed on the screen on the display surface of the subsequent display.

[0016]

As described above, according to the present invention, it is possible to introduce user interactivity into satellite broadcasting or communication while providing compatibility with the conventional BS or CS transmission system.

[Brief description of drawings]

FIG. 1 is a diagram showing a main carrier modulated baseband signal in a satellite broadcast (BS) system.

FIG. 2 is a diagram showing a frame format (A mode) of a voice signal in the BS system.

FIG. 3 is a diagram showing a frame format (B mode) of a voice signal in a BS system.

FIG. 4 is a diagram showing an example of a frame format (B mode) of a voice signal in the CS system.

FIG. 5 is a diagram showing a structure of a data packet which is an example of a data transmission format.

FIG. 6 is a block diagram showing an embodiment of a BS tuner to which the present invention is applied.

[Explanation of symbols]

 1 reception antenna 2 BS converter 3 channel selection / demodulation unit 4 video signal processing unit 5 audio signal processing unit 6 CPU 12 multimedia selector / decoder 13 memory 14 screen display processing unit 15 sync separation circuit 16 operation input unit 163 multimedia・ Select switch

Claims (1)

[Claims] 1. Means for transmitting user-selectable digital data using a digital data area in a BS broadcast or CS communication system, and means for receiving the digital data at a receiving side and guaranteeing a desired data quality. , A multimedia selector in satellite broadcasting having means for multiplexing the digital data by user interactive operation means to select multimedia information consisting of video, audio and digital data.