JPS63299541A - Satellite receiver - Google Patents

Abstract

PURPOSE:To realize the surround reproduction of the satellite surround encoded stereo broadcast, etc., and to obtain the sounds filled with presence, by providing a surround decoder to a satellite receiver for surrounded reproduction. CONSTITUTION:A satellite receiver 3 receives the signals from a broadcast satellite 1 and demodulates the video and sound signals. A surround decoder 22 is added to the receiver 3 to output the signal for surround reproduction based on the demodulated sound signal together with an output terminal 24 which outputs the signal obtained by the decoder 22. When the operation is switched to a stereo mode, etc., for demodulation of the sound signal, the decoder 22 is controlled for output of the signal which is used for surround reproduction. As a result, the viewers can enjoy the sound filled with presence.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a satellite receiver that receives and demodulates signals transmitted from a broadcasting satellite.

[Conventional example] In recent years, stereo broadcasts and the like transmitted from broadcasting satellites have come to be received in ordinary households.

Particularly in the United States, reception of satellite broadcasting has become common.

By the way, this satellite broadcasting includes monaural broadcasting, stereo broadcasting of various systems, etc., and the satellite receiver is equipped with a changeover switch and the like for receiving the broadcasting in monaural mode and various stereoscopic modes. For example, a satellite receiver that receives a stereo audio signal selects two channels of hand voice signals transmitted from a broadcasting satellite, obtains the signals "'L"ah, , 'R'''ch, and reproduces the stereo audio signal. It is carried out. .

[Problems to be solved by the invention] On the other hand, in recent movie theaters, the audience can hear sound from various directions, so it is difficult for the audience to hear the sound with a sense of realism. It is now possible to do so. This is 1. For example, speakers are placed in front and behind the viewer, and the speaker is directed not only from the front but also from the front.
Surround playback is performed by controlling the sound field so that the sound can be heard from behind. This sound field control is realized using a surround processor or the like.

This invention was made in view of the above points.

The purpose is to provide a new satellite receiver that can reproduce surround sound using at least two channels of surround encoded signals transmitted from a broadcasting satellite.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a satellite receiver that receives signals transmitted from a broadcasting satellite and demodulates video and audio signals. At the time of demodulating the audio signal, the stereo When switching to a mode or the like, the surround decoder is controlled to output a signal for surround reproduction.

[Example] Embodiments of the present invention will be described below based on the drawings.

In the figure, multiple channels of signals transmitted from a broadcasting satellite 1 are received by an antenna 2. This signal is converted into a first intermediate frequency signal by the down converter amplifier 2a of the antenna 2, and is input to the satellite receiver 3. Of the first intermediate frequency signals, the video signal and the audio signal of the desired channel are demodulated by the amplifier circuit 41, the frequency conversion circuit 5, the intermediate frequency amplification circuit 6, the detection circuit 7, etc. in the same manner as in the prior art. Here, for example, when stereo is being received, the audio signal passes through the audio subcarrier amplification circuit 8 and is converted into, for example, an "L+R modulation" signal by the first frequency conversion circuit 9. It is demodulated by the detection circuit 11, converted into an "L-R modulation" signal by the frequency conversion circuit 12 of the power tube 2, and then sent to the intermediate frequency amplification circuit 13 and the detection circuit 14.
It is demodulated by In addition, these frequency conversion circuits 5, 9.1
The frequency conversion in step 2 is performed by a microcomputer (C
PU) 15 in the same manner as before. This CPU1
5 is equipped with a memory RAM 15a in which information etc. for switching are stored.

"L + R" and 'L - obtained with the above circuit
Both of the signals of "R" are input to the matrix decoder 16, and the signals of "L + R" are input to the multiplex decoder 17.
, “R”, “L + R” and 11 L RII
These signals are input to the mode switching means 18. This mode switching means 18 is, for example, an electronic switch, and is operated in conjunction with switching of the channel selection switch when receiving the receiver 8.

This mode switching means 18 is equipped with two sets of changeover switches 19 and 20, each with a monaural terminal 19.
a, 20a, discrete terminals 19b, 20b, matrix terminals 19c, 20c, MPX terminal 19d.

20d, external input terminals 19e and 20e, and common terminals 19f and 20f connected to these terminals. By switching the mode switching means 18, stereo audio signals 11 L II, 14 R79ch are obtained, and are output from the conventional stereo terminals 23, 23, as well as ``L II, II RII cl,''. The signal is input to the surround decoder 22. Also, the external input terminals 21 and 21 are connected to the external input terminals 19e and 20e.
For example, an audio signal (external signal) from a VTR, video disc, etc. is input from the input device. 11 L I for surround playback from the surround decoder 22
II ch, signal 11 Rg IT ch, signal is output from the surround output terminals 24 and 24 for rear speakers.

Therefore, in the case of surround playback, the audio signal output from the satellite receiver 3 is the "L" 11 Rl' ah signal in the case of normal stereo and the 'I L I
Next, the operation of the satellite receiver having the above configuration will be explained.

First, the channel selection switch of the satellite receiver 3 is operated to receive a stereo broadcast from the broadcasting satellite 1. Then, the mode switching means 18 is activated in conjunction with the operation of the channel selection switch or the like. As a result, the received stereo broadcast 2 under the control of the CPU 15
The audio signal of the channel passes through the audio subcarrier amplification circuit 8 and is then sent to the frequency conversion circuits 9, 12 . Intermediate frequency amplifier circuit 10.1
3. The signal is demodulated by the detection circuit 11.14, and "L+R" and "LR" signals are obtained. Based on the "L + R" and "L - R" signals obtained in this way, the signals of 11 L II and 11 R11ch are sent to the stereo terminal 23 for the speakers placed in front of the viewer.
The surround decoder 22, which is further controlled by the CPU 15, outputs, for example, delayed "L",
A signal of Rl l''ch is outputted from the surround playback terminal 24, 24 for a speaker placed behind the viewer.

Therefore, when the received stereo broadcast is played back in surround, the stereo terminal 23.2 of the satellite receiver 3
3 and surround playback terminal 24. “L” from 24
# R71, 1'L # II, II RI It c
h, and by outputting the signals from speakers placed in the front and rear, viewers can hear extremely realistic sound.

On the other hand, when the satellite receiver 3 is set to monaural mode for receiving normal broadcast programs, etc., the surround decoder 22 uses a CP so that it does not operate.
Controlled by U15. As a result, the satellite receiver 3 outputs a monaural audio signal.

Further, when the satellite receiver 3 is set to a mode for receiving a surround-decoded MPX signal, the CPU 15 controls the surround decoder 22 using the pilot signal output from the multiplex decoder 17, Obtain a signal for surround reproduction of the audio signal of the received signal. Furthermore, when an audio signal from a VTR device or the like recorded as a surround encoded signal is input as an external input, when a channel selection switch or the like is set to the external input, the mode switching means 18
is switched to the external input terminals 19s and 20e. Thereby, the CPU 15 obtains a signal for surround reproduction of the input audio signal that controls the surround decoder 22.

[Effects of the Invention] As explained above, since the satellite receiver is provided with a surround decoder for surround playback, surround encoded stereo broadcasts of satellite broadcasting, etc. can be played back in surround, and sound with a full sense of presence can be obtained. be able to. Therefore, the satellite receiver can also be used as a new medium.

[Brief explanation of the drawing]

The figure is a schematic circuit block diagram of a satellite receiver showing an embodiment of the present invention. In the figure, 1 is a broadcasting satellite, 2 is an antenna and a down converter amplifier, 3 is a satellite receiver, 4 is an amplifier circuit,
5, 9.12 is frequency conversion and local oscillation circuit, 6.1
0.13 is an intermediate frequency amplification circuit, 7゜11, 14 is a detection circuit, 8 is an audio subcarrier amplification circuit, and 15 is a control circuit (
16 is a matrix decoder, 17 is a multiplex decoder, 18 is a stereo mode switching means, 21 is an external input terminal, 22 is a surround decoder, 23 is a stereo terminal, and 24 is a surround output terminal.

Claims (1)

[Claims] In a satellite receiver that demodulates video and audio signals transmitted from a broadcasting satellite, a surround receiver that outputs a signal for surround playback based on the demodulated audio signal when the audio signal is demodulated. A decoder and an output terminal for outputting a signal obtained by the surround decoder, and when switching to stereo mode when demodulating the audio signal, controlling the surround decoder to output a signal for surround playback. A satellite receiver characterized in that it outputs.