JPH043626A - Satellite receiver with memory card installed - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a satellite broadcast receiver that receives broadcast radio waves (hereinafter abbreviated as BS broadcast and CS broadcast) from a broadcast satellite and a communication satellite. In recent years, many satellites have been launched and
Although reception of S broadcasting and C3 broadcasting is now being performed, it is necessary to use a satellite broadcasting receiver that has a receiving circuit and a reproducing circuit compatible with the signal format of each satellite.

[Conventional technology]

In conventional satellite broadcasting receivers, the specifications of the satellite are preset in the memory of the microcomputer built into the satellite broadcasting receiver in accordance with the signal system that differs from satellite to satellite.
By selecting a receiving channel, the characteristics of the receiving circuit and the signal reproducing circuit are switched using a control signal from the microcomputer, so that satellite broadcasting signals of different signal formats can be received.

Especially for newly launched satellites, there is no other way than for the user to preset the specifications of these satellites.

[Problem to be solved by the invention]

Therefore, as the number of satellites increases, the amount of data stored in the microcontroller increases, so it is necessary to prepare a satellite broadcasting receiver with a large capacity of memory in advance.
As the price of memory has increased, the products have become more expensive, and there have been problems in that users have to confirm the specifications of newly launched satellites.

The present invention uses a memory expansion card in which the specifications of each satellite are stored in advance, so that the satellite broadcasting receiver only needs to have an appropriate capacity of memory. The purpose is to suppress product price increases and to provide a memory expansion card that stores the specifications of a newly launched satellite, thereby eliminating the need for users to preset it.

[Means to solve the problem]

As shown in FIG. 1, a removable memory expansion card 20 is installed in a satellite broadcast receiver 21, and the memory is controlled by a system microcomputer used in a system control circuit 5 provided in the satellite broadcast receiver 21. The data concerning the receiving satellite stored in advance in the expansion card 20 is read out and a control signal is output, and based on the control signal, the characteristics of the satellite broadcasting signal receiving circuit and the signal reproducing circuit are switched, and the satellite with a different signal system is transmitted. It is designed to receive and reproduce broadcast signals.

[Effect]

With the above configuration, the present invention is configured to switch the characteristics of the satellite broadcasting signal receiving circuit and the signal reproducing circuit of the satellite broadcasting receiver in accordance with the format of the satellite broadcasting signal to be received. For example, for BS broadcasting, The first intermediate frequency converted by the first converter is 1035 to 1335 MHz, and the receiving channel is CH
Odd numbered channels from I to CH15 are used, and for C8 broadcasting, the first intermediate frequency converted by the first converter is 950 to 1770MHz, and the receiving channel is CHI.
~CH32 and the receiving channel is CHI~CH1
There are 9 types, and by switching the oscillation frequency of the voltage controlled oscillator 4 of the channel selection circuit shown in FIG. 1, it is possible to receive satellite broadcast signals of CHs having different frequencies.

In addition, the exclusive bandwidth of the signal per channel varies depending on the satellite, and some are 27 MHz and others are 36 MHz.The BPF band switching circuit 8 shown in Fig. 1 switches the band characteristics, and satellite broadcasting signals with different bandwidths are used. It is possible to play.

Furthermore, BS broadcasting uses PCM as the modulation method for audio signals.
However, C8 broadcasting uses PCM modulation and FM modulation depending on the channel, and by switching the audio signal demodulation circuit with the changeover switch 13 shown in Figure 1, it is possible to switch between audio signals with different modulation methods. I'm trying to play the signal.

〔Example〕

FIG. 1 is an electric circuit block diagram of a satellite broadcasting receiver showing an embodiment of the present invention. Reference numeral 1 indicates an input terminal of the satellite broadcasting receiver 21, and 1 is an input terminal of the satellite broadcasting receiver 21, which receives radio waves of the 12GH2 band from the satellite. One converter converts the signal into a first intermediate frequency signal in the IGHz band, and inputs the signal to the input terminal 1.

The first intermediate frequency signal input to the power supply terminal 1 is guided to a high frequency amplification circuit 2, amplified by the same high frequency amplification circuit 2, and input to a mixing circuit 3.

When a satellite and a reception channel are selected by operating the operation unit of the satellite broadcast receiver 21, the frequency data regarding the reception channel stored in advance in the memory expansion card 20 attached to the satellite broadcast receiver 21 is transferred to the card connector 6. A control signal is read out by a microcomputer in a system controller 5 provided in a satellite broadcasting receiver 21 via a microcomputer and applied to a voltage controlled oscillator 4 constituting a phase synchronized circuit, and the voltage controlled oscillator 4 The oscillation frequency is changed according to the control signal, output, and input to the mixing circuit 3.

The mixing circuit 3 mixes the signal from the high frequency amplifier circuit 2 and the signal from the voltage controlled oscillator 4, converts it into a second intermediate frequency signal, outputs it, and inputs it to the second intermediate frequency amplifier circuit 7. The input signal is amplified and outputted by the second intermediate frequency amplification circuit 7 and inputted to the BPF band switching circuit 8.

When a satellite and a receiving channel are selected by operating the operation unit of the satellite broadcasting receiver 21, data on the signal bandwidth regarding the receiving channel stored in advance in the memory expansion card 20 installed in the satellite broadcasting receiver 21 is read. Card connector 6
The microcomputer in the system control 5 provided in the satellite broadcasting receiver 21 reads out the control signal via B.
The signal is input to the PF band switching circuit 8, and the PCM demodulation circuit 8 eliminates unnecessary signals, allowing only the signal of the selected desired channel to pass and inputting it to the FM demodulation circuit 9.

The FM demodulation circuit 9 performs FM demodulation, demodulates the video signal, branches it and outputs it, inputs one of the branches to the AFT circuit 10, which detects and detects the input video demodulated signal. Input the signal to system control 5,
The system controller 5 controls the oscillation frequency of the voltage controlled oscillator 4 to keep the second intermediate frequency constant.

The other branch of the FM demodulation circuit 9 is input to a video circuit 11, which separates and outputs an audio signal and a video signal, and the audio signal is input to a switch 13.
The video signal is input to the video signal processing section 12, where the video signal processing section 12 de-emphasizes the signal pre-emphasized on the transmitting side and returns it to the original signal.
．． A 5 MHz LPF removes audio signal components, and an energy spread signal removal circuit removes the energy spread signal, which is output and input to the descrambling module 14.

When a satellite and a reception channel are selected by operating the operation unit of the satellite broadcast receiver 21, audio signals related to the satellite and reception channel stored in advance in the memory expansion card 20 installed in the satellite broadcast receiver 21 are played back. A microcomputer in a system controller 5 provided in the satellite broadcasting receiver 21 reads the data via the card connector 6, outputs a control signal, and inputs the control signal to the switch 13 and the descramble module 14.

In the case of BS broadcasting, the switch 13 is connected to the 4DPSK demodulation circuit 22 side, and the audio signal is applied from the switch 13 to the 4DPSK demodulation circuit 22, and the 4DPSK demodulation circuit 22 sends the audio signal to the PC.
The demodulated digital signal of M code strings is output and inputted to a PCM demodulation circuit 16, where the digital signal is subjected to bit error correction and PCM demodulation, and the demodulated digital audio signal is sent to a D/A converter. 17 and enter the same D
/A converter 17 converts it into an analog audio signal and outputs it,
The video signal is output from the audio output terminal provided on the satellite broadcasting receiver 21 via the amplifier 19, and the video signal is passed through the descrambling module 14 according to the control signal from the system control 5, and is output via the amplifier 18. Output from the output terminal.

In the case of CS broadcasting, some audio signals are transmitted using PCM modulation and others are transmitted using FM modulation.For those transmitted using FM modulation, the system control 5 The audio signal is input to the FM demodulation circuit 15 by connecting the switch 13 to the FM demodulation circuit 15 side according to the control signal, and the FM demodulation circuit 15 performs FM demodulation and the demodulated signal is sent to the FM demodulation circuit 15 through the amplifier 19. Output from the audio output terminal.

The audio signal is transmitted using PCM modulation, and the reproduction of the unscrambled signal is processed in the same way as in the case of BS broadcasting.

If scrambled, PCM demodulation circuit 16
and the descrambling module 14 are in a connected state, and the video signal is input to the descrambling circuit of the descrambling module 14 by a control signal applied from the system control 5 to the descrambling module 14 and the switching device 13. , the audio signal is applied from the switch 13 to the 4DPSK demodulation circuit 22, and the 4DPSK demodulation circuit 22
The SK demodulation circuit 22 demodulates the PCM code string into a digital signal, outputs it, inputs it to the PCM demodulation circuit 16, and outputs the PCM code string as a digital signal.
The bit errors of the digital signal are corrected in the i circuit 16, and the audio signal and scramble information of the audio data and video data contained in the audio signal are inputted from the PCMgdl tone circuit 16 to the descrambling module 14. .

In the descrambling module 14, the audio signal is descrambled based on the scramble information of the audio data, and is inputted to the PCM demodulation circuit 16, which performs PCM demodulation to demodulate the digital audio signal. The D/A converter 17 converts the signal into an analog audio signal and outputs it, and the audio signal is sent via the amplifier 19 to an audio output terminal provided on the satellite broadcasting receiver 21. I'm trying to output more.

The video signal is descrambled by the descrambling module 14 according to the scramble information of the video data, and outputted, and then outputted from the video output terminal via the amplifier 18.

The audio signal output from the audio output terminal and the video signal output from the video output terminal are input to a reproduction television receiver or the like, and the audio signal and video signal are reproduced.

For newly launched satellites, providing the specifications of these satellites stored in the memory expansion card 20 in advance eliminates the need for presetting by the user. Memorize the position control data in the memory expansion card 20,
It is also possible to have the system microcomputer read out the memory and output a control signal, and operate the antenna actuator based on the control signal to control the position of the receiving antenna.

〔Effect of the invention〕

As explained above, according to the present invention, by using a memory expansion card in which the specifications of each satellite are stored in advance, the amount of memory used in the satellite broadcasting receiver can be reduced, which increases the price of the product. To provide a satellite broadcasting receiver that does not require a user to preset the specifications of a newly launched satellite by suppressing this and providing a memory expansion card that stores the specifications of the satellite for newly launched satellites. be able to.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit block diagram of a satellite broadcasting receiver showing one embodiment of the present invention. 1--input terminal, 2- high frequency amplifier circuit, 3 mixing circuit, 4-- voltage controlled oscillator, 5- system control, 6-- card connector, 7 second intermediate frequency amplifier circuit, 8-・-B P F band switching circuit, 9.15-
-- FM demodulation circuit, 1o -AFT circuit, 11-
Video circuit, 12 - video signal processing section, 13...
Switcher, 14- Descrambling module, 16
- P CM demodulation circuit, 17D/A converter, 18.19
・-Amplifier, 20-Memory expansion card, 21-Satellite broadcast receiver, 22-4DPSK demodulation circuit. Patent applicant: Fujitsu General Ltd.

Claims (4)

[Claims] (1) Attach a removable memory expansion card to the satellite broadcasting receiver, and use the system microcomputer included in the satellite broadcasting receiver to read and control data related to the satellite to be received stored in the memory expansion card in advance. A satellite broadcasting receiver equipped with a memory card, which outputs a signal, and reproduces satellite broadcasting signals of different signal formats by switching the characteristics of a satellite broadcasting signal receiving circuit and the signal reproducing circuit based on the control signal. . (2) The memory card-mounted satellite broadcasting receiver according to claim 1, wherein the satellite broadcasting signal of a CH having a different frequency is reproduced by switching the channel selection circuit characteristics of the satellite broadcasting signal receiving circuit. (3) Claim (1) characterized in that the BPF band switching circuit characteristics of the satellite broadcast signal receiving circuit are switched to reproduce satellite broadcast signals having different signal bandwidths per channel.
The memory card-equipped satellite broadcast receiver described. (4) A memory card-mounted satellite broadcast receiver according to claim (1), wherein the satellite broadcast signal with a different audio signal modulation method is reproduced by switching the audio reproduction circuit characteristics of the satellite broadcast signal reception circuit. Machine.