JP2861872B2 - Satellite signal transmitting apparatus and satellite receiving apparatus for video signal by frequency division multiplex digital system, and satellite communication apparatus comprising them - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal satellite transmitting apparatus and a satellite receiving apparatus using a frequency division multiplex digital system in which a reception channel can be preset, and a satellite communication apparatus comprising the same. In a satellite transmission / reception system that transmits and receives video signals and audio signals, switching transmission / reception operation of transmission signals by another transmission station that is currently transmitting can be performed in one behavior based on station selection information transmitted by a transmission-side encoder. The present invention relates to a satellite signal transmitting apparatus and a satellite receiving apparatus for a video signal based on a frequency division multiplex digital system, and a satellite communication apparatus including the same.

[0002]

2. Description of the Related Art When a transmission signal is selected by a satellite receiver operated by a frequency division multiplex digital system, a transponder (repeater) number and a channel number (frequency setting in the transponder) mounted on a satellite and a video compression mode (transmission) are selected. Rate), the three tuning parameters are manually and independently set.

[0003]

In a satellite receiver operated in an analog system, reception can be performed only by selecting a transponder number. However, in the case of a digital system, a transponder number can be obtained in a time division multiplex digital system. In the satellite receiving apparatus operated by the frequency division multiplex digital system, the setting of the video compression mode for designating the channel number indicating the frequency setting content in the transponder and the transmission rate in addition to the transponder number is necessary. In order to change the receiving channel, it is necessary to operate these three tuning parameters independently, and the tuning operation becomes very complicated.

An object of the present invention is to solve the above-mentioned problems and to provide a video signal satellite transmitting apparatus and a satellite receiving apparatus using a frequency division multiplexing digital system, which greatly facilitates channel selection operation, and a satellite communication apparatus comprising them. Is to do.

[0005]

The present invention has the following means in order to achieve the above object. That is, a satellite signal transmitting apparatus for transmitting a video signal based on the frequency division multiplex digital method according to the present invention is a transponder for distinguishing a transponder currently transmitting from a plurality of video signals accompanied by audio information using the frequency division multiplex digital method. A register in which station selection data including a number, a channel number specified by a frequency setting in the transponder, and a video compression mode specifying a transmission rate, and the station selection data registered in the register are stored in the register. And a multiplexer for transmitting the multiplexed signal as a transmission multiplexed signal by adding it to a video signal accompanied by information.

Further, the satellite receiving apparatus for video signals based on the frequency division multiplex digital system of the present invention is obtained by a built-in demodulator in a satellite receiving apparatus for receiving a plurality of video signals accompanied by audio information by the frequency multiplex digital system. A transponder number for distinguishing a transponder currently being transmitted added to the plurality of video signals by the encoder of the satellite transmission device from the demodulated output, a channel number specified by a frequency setting in the transponder, and video compression representing a transmission rate. A demultiplexer for separating and extracting station selection data including a mode, a storage circuit for storing the station selection data extracted by the demultiplexer as preset data required for station selection, and a transmission signal on an operation panel provided. A transmission signal of a desired station based on the preset data Against and has a configuration in which a one behavior microcomputer makes it possible to selectively received in.

Further, the satellite receiving apparatus for a video signal based on the frequency division multiplex digital system of the present invention has a configuration in which a storage circuit for storing preset data required for the station selection is built in the microcomputer. Also, satellite communication apparatus of a video signal by frequency division multiplexing the digital system of the present invention, any plurality of the satellite transmission device and a plurality of the
Respectively Kano satellite receiver has a configuration for performing transmission and reception of video signals with audio information via the uplink and downlink satellite.

[0008]

Next, the operation of the present invention configured as described above will be described. In addition to the satellite receiver operated by the analog system, the selection of the transmitting station by the satellite receiver operated by the time-division multiplex digital system can be performed only by selecting the transponder number, but the satellite operated by the frequency-division multiplex digital system. In the case of a receiving device, it is necessary to select a transmitting station by using a channel number and a video compression mode in addition to the transponder number, which makes the operation of selecting a transmitting station very complicated.

According to the present invention, in a satellite transmission / reception system operated by a frequency division multiplex digital system, a transmission side encoder uses station selection information necessary for selecting a transmission station which can currently select a digital signal of data to be transmitted. And multiplexes the transponder number and channel number (frequency allocation in the transponder) and the video compression mode (transmission rate).

In the frequency division multiplex digital system, the channel number indicates the frequency at which the signal is to be carried in the transponder, since a plurality of signals are frequency-divided and carried in the same transponder. Things.

On the receiving side, the above-mentioned station selection information is multiplexed and extracted from the digital signal demodulated by the built-in demodulator, and stored in a storage medium as preset data necessary for station selection. If a tuning operation is performed on the receiving operation panel to receive a transmission signal that tunes to a transmitting station other than the one currently transmitting, the transponder number, channel number, and video are stored using the stored preset data. A compression mode is set to enable a desired transmission signal reception operation in one behavior.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the embodiment shown in FIG. 1, the satellite transmitting apparatus as a transmitting side illustrates a digital converter / data compressor 11, an all-channel station selection data register 12, a multiplexer 13, and transmission multiplexed data transmitted from the multiplexer 13. A multiplexed data transmission circuit 14 for transmitting a transmission signal to be transmitted via an uplink to a satellite not to be transmitted, and a transmission antenna 15 are provided.

The satellite receiver as a receiving side includes a receiving antenna 21, a tuner unit 22, a demodulator 23, a demultiplexer for separating and outputting multiplexed multiplexed video and audio data and station selection data. 24, if a built-in storage circuit for storing the station selection data separated / extracted by the demultiplexer 24, and it is possible to select and receive one behavior of a desired transmitting station based on a channel switching signal provided from an operation panel (not shown) Microcomputer 2
5 and a decoder 26 and a D / A converter 27.

The above-described satellite transmitter on the transmitting side shows only the configuration directly related to the present invention, and other commonly used well-known configurations are omitted. Usually, the satellite transmitting apparatus is provided with a plurality of systems and transmits the signals to the satellite by uplink. However, for convenience of explanation, FIG. 1 shows only one of these systems. The encoder 10 is constituted by the digital converter / data compressor 11, the all-channel station selection data register 12, and the multiplexer 13 in FIG.

Next, the operation of this embodiment will be described.
The digital converter / data compressor 11 on the transmission side performs digital conversion and data compression of the input video data and audio data, and supplies the output to the multiplexer 13. The all channel station selection data register 12 stores all the channels including the transponder numbers of all the channels including those currently transmitted using another encoder in the satellite transmission / reception system, the channel numbers, and the video compression mode. Station selection data is registered in advance.

The multiplexer 13 has a digital converter /
The output of the data compressor 11 and all channel station selection data read from the all channel station selection data register 12 are multiplexed and sent to the multiplexed data transmission circuit 14 as transmission multiplexed data a. The multiplexed data transmission circuit 14 includes a modulator that digitally modulates the transmission multiplexed data a, a converter that converts the output of the modulator to an uplink frequency to be transmitted to the satellite, and a large power amplifier that amplifies the output of the converter. And a power amplifier. The output of the multiplexed data transmission circuit 14 is applied to a transmission antenna 15 and
The radiation output of No. 5 is transmitted to a satellite (not shown) via the satellite uplink b.

On the receiving side, a receiving antenna 21 is transmitted from a satellite transponder (not shown) via a satellite downlink c.
Captures the satellite output and outputs the received multiplexed data d, which is supplied to the tuner unit 22. The tuner unit 22 supplies the tuner unit output e, which has been obtained by converting the received signal from the desired channel into a baseband signal and outputs the same, to the demodulator 23.
Supplies a demodulated output g of digital data obtained by demodulating the demodulated data to the demultiplexer 24.

The demultiplexer 24 separates the multiplexing of the demodulated output g into digital video / audio data i and station selection data h as channel information. The station selection data h includes transponder numbers, channel numbers, and video compression modes corresponding to all encoders currently transmitted to the satellite by uplink.

The microcomputer 25 stores the station selection data h in a built-in storage medium,
1, the tuner unit 22 receives a transponder number / channel number j required for tuning out of the station selection data and a demodulator based on the stored station selection data h. The video compression mode data f necessary for demodulation and decoding is supplied to the decoder 23 and the decoder 26, respectively, to enable one-way reception from another satellite transmitter.

The decoder 26 receives the digital video / audio data i, decodes it, outputs the decoded digital video / audio data k, and supplies it to the D / A converter 27. The D / A converter 27 This is converted to an analog signal to output an analog video / audio output n, and transmitted via an output terminal 202.

FIG. 2 is a diagram showing a data format of the transmission multiplexed data a in the embodiment of FIG. The transmission multiplexed data a includes a transponder number, a channel number (frequency allocation within the transponder), and a video compression mode (transmission rate) in addition to the synchronization / control signal 101, the digital video signal 102, and the digital audio signal 103. And all channel station selection data 104 including

FIG. 3 is an explanatory diagram of an example of a channel selection operation of the embodiment of FIG. FIG. 3 shows a transponder (# 1) 301,
Three transponders, transponder (# 2) 302 and transponder (# 3) 303, are shown as examples. Each transponder has a channel in a different frequency domain. In the case of FIG. 3, the transponder (# 1) 301 The channel selection operation from the channel number (3) to the channel number (6) of the transponder (# 2) 302 is schematically shown.

In the frequency division multiplex digital system, a plurality of signals (channels) are arranged in the same transponder, and the occupied frequency band of one signal differs depending on the video compression mode (transmission rate). In this way, the switching operation on the operation panel makes it possible to very easily select a desired station with one behavior.

[0024]

As described above, according to the present invention, a transponder number, a channel number and a receivable number which can be received at present in a satellite transmitting apparatus and a receiving apparatus of a video signal based on a frequency division multiplex digital system and a satellite communication apparatus comprising them By transmitting the station selection data including the video compression mode from the satellite transmission device and presetting it in the satellite reception device in advance, and reading the station selection data by operating the operation panel and setting the reception channel as desired,
The reception channel can be changed by a simple operation with one behavior.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a data format of transmission multiplexed data a in the embodiment of FIG.

FIG. 3 is an explanatory diagram of an example of a channel selection operation of the embodiment in FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 encoder 11 digital converter / data compressor 12 all channel station selection data register 13 multiplexer 14 multiplexed data transmission circuit 15 transmission antenna 21 reception antenna 22 tuner section 23 demodulator 24 demultiplexer 25 microcomputer 26 decoder 27 D / A conversion vessel

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04B 7/14-7/22 H04H 1/00 H04J 1/00-1/20 H04N 7/20

Claims (4)

(57) [Claims] 1. A satellite transmitting apparatus for transmitting a plurality of video signals accompanied by audio information in a frequency division multiplex digital system, a transponder number for distinguishing a transponder currently transmitting, and a channel specified by a frequency setting in the transponder. A register in which station selection data including a number and a video compression mode specifying a transmission rate is registered in advance, and the station selection data registered in the register is added to a video signal accompanying the audio information as a transmission multiplex signal. A video signal satellite transmission device using a frequency division multiplex digital system, comprising an encoder having a multiplexer for transmitting. 2. A satellite receiving apparatus for receiving a plurality of video signals accompanied by audio information in a frequency multiplex digital system, wherein demodulated outputs obtained by a built-in demodulator are added to the plurality of video signals by an encoder of a satellite transmitting apparatus. A demultiplexer for separating and extracting station selection data including a transponder number for distinguishing a transponder currently being transmitted, a channel number specified by a frequency setting in the transponder, and a video compression mode representing a transmission rate; A storage circuit for storing the station selection data extracted by the multiplexer as preset data required for station selection,
And a microcomputer which makes it possible to select and behave in a certain manner with respect to the transmission signal of a desired station based on the preset data through a channel selection operation of a transmission signal on an arranged operation panel. Satellite receiver for video signals by division multiplex digital system. 3. The satellite reception of a video signal by the frequency division multiplex digital system according to claim 2, wherein a storage circuit for storing preset data required for the station selection is built in the microcomputer. apparatus. 4. A plurality of satellite transmitters according to claim 1,
A plurality of satellite receivers according to claim 2 or 3 each having a configuration for transmitting and receiving a video signal accompanied by audio information via an uplink and a downlink of a satellite. Satellite communication device for video signals by multiplex digital system.