JPH0322096B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a satellite broadcast receiving system in which an antenna positioner for selecting a satellite number and a channel number is used in combination with an audio device. This invention relates to a manual/automatic switching circuit that switches from manual specification to automatic specification when a pin plug for inputting a control code signal from the Jonar is inserted into the jack of an audio device.

"Prior Art" First, an outline of a satellite broadcast television receiver will be explained. Currently, in the United States, the interval is 2 to 5 degrees.
More than 20 private broadcasting geostationary satellites have been launched, each receiving signals using a television receiver equipped with an antenna position control device as shown in Figure 3. In this figure, 1 is a reflector of a parabolic antenna, an antenna 2 is installed at the focal point of this reflector 1, and a low noise amplifier and down converter 3 coupled to this antenna 2 are connected to a receiver 4 via a cable. combined. A monitor TV 5, an audio device 6, and an antenna positioner 7 are connected to the receiver 4, and the audio device 6 is connected to left and right speakers 9, 1 via an audio amplifier 8.
0 is connected. Further, the antenna positioner 7 is coupled to the antenna 2 and an actuator 12 for pointing to the position of the geostationary satellite 11.

In the above configuration, when a certain satellite 11 is selected by the antenna positioner 7, the actuator 12 directs the parabolic antenna reflector 1 to the target satellite. At the same time, the angle of the metal rod inside the antenna 2 is set depending on whether the wave is vertically polarized or horizontally polarized. Furthermore, since each satellite has 24 channels, the antenna positioner 7 selects one of the channels.

The 3.7~4.2GHz signal from the satellite 11 is reflected by the reflector 1, received by the antenna 2, and converted to 430~930MHz by the low noise amplifier and down converter 3.
and sent to receiver 4. The antenna positioner 7 sends to the receiver 4 a control code signal indicating which video channel is selected. The input signal from the antenna 2 is further reduced to 90MHz by the receiver 4, and then separated into a video signal and an audio signal.
sent to. The audio signal separated by the receiver 4 is carried by a subcarrier signal of 5 to 8.5 MHz and sent to the audio device 6. At this time, a control code signal is sent to the audio device 6 from the antenna positioner 7 to indicate which satellite and which channel the audio is from. That is, the audio device 6 transmits information such as the distinction between discrete stereo, matrix stereo, multiplex stereo, and monaural, and what Hz the subcarrier frequency is.
Furthermore, this audio device 6 amplifies the audio intermediate frequency.
FM detection is performed, which is further amplified by an audio amplifier 8, and audio is output from left and right speakers 9 and 10.

In the above satellite broadcasting receiving system,
The audio signal is sent to the input circuit of the audio device 6 at 5 to 8.5M.
Hz subcarrier, but not only does the frequency of the subcarrier differ depending on the satellite number and channel, but also 1-channel transmission that transmits on one frequency, and 2-channel transmission that transmits on two frequencies. There are two methods: channel transmission, 3-channel transmission that transmits on three frequencies, and
There are also discrete systems, matrix systems, and multiplex systems for stereo, and you must choose one of these systems depending on your purpose. Specifically, for example, input is made in the following state.

(1) 6.8MN (monaural): L+R monaural signals are being transmitted on one 6.8MHz subcarrier.

(2) 6.8MX (Multiplex Stereo): 6.8M
L and R are transmitted on one Hz subcarrier by multiplex broadcasting.

(3) 6.2 & 6.8MN: For example, the exact same L+R is being transmitted on 6.2MHz and 6.8MHz, or 6.2MHz
and is being transmitted in two languages on 6.8MHz.

(4) 5.8 & 6.8MS (matrix stereo): For example, L+R is sent to the 5.8MHz subcarrier, and L-R is sent to the 6.8MHz subcarrier.

(5) 6.8MN/5.58 & 5.76DS (discrete stereo): L+R, 5.58 on 6.8MHz subcarrier
L and 5.76MHz signals are being sent to &.

Conventionally, in the above-described receiving device that receives audio signals, when the satellite number and channel number are selected using the antenna positioner 7, the A channel down button in the keyboard provided on the audio device 6 is pressed. The channel frequency was manually selected using the up button, the down button for the B channel, and the up button, and the mode was selected using the monaural/stereo mode selection button, such as monaural or stereo, and if stereo, the system. .

``The problem that the invention aims to solve'' Therefore, there was a problem that it was time-consuming and extremely troublesome. Therefore, the present applicant has proposed a system in which the subcarrier frequency and stereo mode in the reproduction circuit are automatically selected when the control code signal from the antenna positioner 7 is input to the audio device 6. but,
Not only does it require a switch to change between automatic and manual mode, but there is also a slight problem in that the user makes a mistake in distinguishing between automatic and manual mode.

"Means for Solving the Problems" The present invention has been made to solve the above-mentioned problems, and the antenna positioner selects the target satellite number and channel number and attaches the antenna to the target satellite. and send the signal of the desired channel of that satellite to the receiver via the antenna.
In a satellite broadcast receiving system in which a video signal and an audio signal are separated, the video signal is sent to a monitor TV, and the audio signal is sent to a reproduction circuit of an audio device for reproduction, the antenna positioner is configured to send the audio signal to the audio device. The audio device includes a keyboard having a channel tuning button and a stereo mode switching button, and a microcomputer that controls manual operations using the keyboard and data stored in a memory. , a switching circuit for switching between manual operation and automatic operation of this microcomputer; this switching circuit and the microcomputer are connected to switch the switching circuit to manual operation by the insertion operation of the pin plug; Control code signal from antenna positioner,
and a jack for sending data to the microcomputer via an input terminal.

``Operation'' When the pin plug of the antenna positioner is not connected to the jack of the audio device, the microcomputer is operated manually.
The subcarrier signal input from the receiver to the regeneration circuit is tuned manually using the keyboard to obtain the desired frequency of the desired channel, and the mode is switched manually.

When the pin plug is connected to the jack, a signal is sent to the microcomputer via the switching circuit to switch to automatic operation. Therefore, the microcomputer automatically obtains the frequency based on the control code signal of the antenna positioner, and the stereo mode is automatically switched.

"Example" An embodiment of the present invention will be described based on FIG.

Reference numeral 30 denotes an input terminal for an audio signal inputted on a subcarrier signal of 5 to 8.5 MHz.
This input terminal 30 has an A channel reproducing circuit 31.
and B channel reproduction circuit 32 are connected in parallel with each other, and their output sides are connected to an L output terminal 34 and an R output terminal 35 via a monaural/stereo mode switching circuit 33.

The two reproduction circuits 31 and 32 are coupled to a microcomputer (hereinafter referred to as microcomputer) 38 via channel tuning oscillation circuits 36 and 37, respectively.

The microcomputer 38 further includes displays 55 and 56 for tuning frequency of each channel A and B, a keyboard 57, a ROM (read only memory) 58 for storing programs, etc., and a RAM for storing data.
(Random access memory) 59, input terminal 60 for control signals when selecting a specific satellite number and channel number from the antenna positioner 7 in FIG. 3, output when the reproduction circuits 31 and 32 receive an audio signal SD terminal SD, SD,
The monaural/stereo mode switching circuit 33 and a switching circuit 39 described later are coupled. The keyboard 57 includes a power on/off button 45, an A channel frequency down button 46 and an up button 47, a B channel frequency down button 48 and an up button 49, a manual button 40 for manually setting the frequency, and a manual button 40 for manually setting the frequency. DS (discrete stereo) button 50 and MS for controlling the mode switching circuit 33
A stereo mode switching button 53 consisting of a (matrix stereo) button 51 and an MN/MX (monaural/multiplex stereo) button 52, a write button 54 to the RAM 59, etc. are provided.

Further, as shown in FIG. 2, a pin plug 42 is coupled to the tip of a cord 41 that sends out a control code signal of the antenna positioner 7. A jack 43 to be connected to the pin plug 42 is provided on the audio device 6 side. The jack 43 includes a contact piece 44, an insulating piece 61, a normally closed contact 62, and a grounding fitting 60a. It is coupled to the microcomputer 38 via a power on/off switching circuit 39 consisting of resistors 64 and 65.

Next, the operation of the above configuration will be explained. When the pin plug 42 is not inserted into the jack 43, the normally closed contact 62 is closed, so the transistor 63 of the switching circuit 39 is turned off, and an H signal for manual operation is applied to the microcomputer 38. Therefore, the microcomputer 38 is operated manually by manually operating the down button 46, up button 47, down button 48, up button 49, and manual button 40 of the keyboard 57 to control the playback circuits 31 and 32 of the A channel and B channel. mode switching circuit 3 by tuning and operating the stereo mode switching button 53.
Switch the mode of 3.

When the pin plug 42 is inserted into the jack 43,
A control code signal is sent from the pin plug 42 to the microcomputer 38 via the contact piece 44. At the same time, the normally closed contact 62 is opened, so the transistor 63 of the switching circuit 39 is turned on, and the H signal for manual operation is no longer supplied to the microcomputer 38, resulting in automatic operation. Then, in advance RAM39 or
Based on the data stored in the ROM 58, the reproducing circuits 31 and 32 of the A and B channels are automatically tuned, and the mode of the mode switching circuit 33 is switched.

"Effects of the Invention" Since the present invention is configured as described above, if the pin plug for the control cord signal of the antenna positioner is connected to the jack of the audio device, the operation will be automatic, and if it is not connected, the operation will be manual. There is no chance of handling errors. In addition, since an automatic/manual changeover switch is not required, it can be provided at low cost.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of a manual/automatic switching circuit in a satellite broadcasting receiving system according to the present invention, Fig. 2 is an explanatory diagram of a pin plug and jack, and Fig. 3 is a block diagram of the satellite broadcasting receiving system. be. 1...Reflector, 2...Antenna, 3...Low noise amplifier and down converter, 4...Receiver, 5...Monitor TV, 6...Audio device, 7...Antenna positioner, 8...Audio amplifier, 9, 10...Speaker, 11
... Satellite, 12 ... Actuator, 30 ... Audio input terminal, 31, 32 ... Reproduction circuit, 33 ... Mode switching circuit, 34, 35 ... Output terminal, 36, 37 ... Tuning oscillation circuit, 38 ... Microcomputer, 39 ... Switching circuit , 40... Manual button, 41... Cord, 42... Pin plug, 43... Jack, 44... Contact piece, 45
...Power on/off button, 46...A channel down button, 47...A channel up button, 48...B channel down button, 49...B channel up button,
50...DS button, 51...MS button, 52...MN/MX
Button, 53... Stereo switching button, 54... Memory write button, 55, 56... Display, 57... Keyboard, 5
8...ROM, 59...RAM, 60...input terminal from antenna positioner, 60a...ground metal fitting,
61... Insulating piece, 62... Normally closed contact, 63... Transistor, 64, 65... Resistor.

Claims (1)

[Claims] 1. Select the target satellite number and channel number with the antenna positioner, direct the antenna to the target satellite, send the signal of the target channel of the satellite to the receiver via the antenna, In a satellite broadcast receiving system in which a video signal and an audio signal are separated, the video signal is sent to a monitor TV, and the audio signal is sent to a reproduction circuit of an audio device for reproduction, the antenna positioner is configured to send the audio signal to the audio device. The audio device includes a keyboard having a channel tuning button and a stereo mode switching button, and a microcomputer that controls manual operations using the keyboard and data stored in a memory. , a switching circuit for switching between manual operation and automatic operation of the microcomputer; this switching circuit is coupled to the microcomputer, and the switching circuit is switched to manual operation by the insertion operation of the pin plug;
A manual/automatic switching circuit in a satellite broadcast receiving system, comprising a jack for transmitting a control code signal from the antenna positioner transmitted to the pin plug to the microcomputer via an input terminal. . 2. A manual/automatic switching circuit in a satellite broadcast receiving system according to claim 1, wherein the reproduction circuit comprises an A channel and a B channel connected in parallel.