JPH0575229B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a display device for receiving frequencies in a satellite broadcast receiving system. More specifically, in a satellite broadcast receiving system, the audio signal is
For example, 6.8MN (monaural), 6.8MX (multiplex stereo), 6.2 & 6.8MN, 5.8 & 6.8MS (matrix stereo), 6.8MN/5.5 & 5.76DS (discrete stereo), etc. There are various methods: 1-channel transmission that transmits on 2 frequencies, 2-channel transmission that transmits on 2 frequencies, and 3-channel transmission that transmits on 3 frequencies. Normally, audio receiving equipment can receive 2 channels at the same time. The receiving frequency is displayed digitally using two displays, and in the case of monaural or multiplex stereo, only one display is used to display the receiving frequency digitally. This invention relates to a frequency display device.

"Prior Art" First, an outline of a satellite broadcasting 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 4. In FIG. 4, 1 is a reflector of a parabolic antenna, an antenna 2 is installed at the focal point of the reflector 1, and a low noise amplifier and down converter 3 coupled to the antenna 2 are connected to a receiver via a waveguide. 4 is 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 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, in the audio device 6, based on memory information such as the distinction between discrete stereo, matrix stereo, multiplex stereo, and monaural, and the frequency of the subcarrier,
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 intermediate frequency amplification circuit of the audio device 6.
It is sent along the ~8MHz subcarrier,
For example, input in the following state.

(1) 6.8MN: One subcarrier of 6.8MHz,
L+R monaural signals are being transmitted.

(2) 6.8MX: One subcarrier of 6.8MHz,
L and R are transmitting via 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: For example, L+R is sent to the 5.8MHz subcarrier, and LR is sent to the 6.8MHz subcarrier.

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

In a receiving device that receives the above-mentioned signals, 2
It is now possible to receive two signals on separate channels, A and B. Conventionally, as shown in Figure 3, one signal for the A channel (for example, the left channel), and one for the A channel (for example, the left channel).
It has tuning knobs 20 and 21 for the B channel (for example, the right channel), and these tuning knobs 2
0,21, for example, the A channel is 5.8MHz, and the B channel is 5.8MHz.
I adjusted the channel to 6.8MHz while watching the frequency scales 22 and 23 on the panel.

``Problems to be solved by the invention'' It is not accurate to tune the frequency using the tuning knob, and when receiving only one channel, such as monaural or multiplex stereo, it is difficult to make mistakes in operation. The problem was that it was easy to cause.

"Means for Solving the Problems" The present invention was made to solve the above-mentioned problems, and includes a reproducing circuit that regenerates the A channel signal from the received audio signal and a B channel signal. a reproducing circuit for reproducing; a digital display coupled to the A channel reproducing circuit to constantly display the frequency of the carrier signal; and a digital display coupled to the B channel reproducing circuit to display the frequency of the carrier signal only when receiving the B channel. It is equipped with a digital display that displays.

``Operation'' When receiving monaural signals and multiplex stereo signals, the carrier frequency is digitally displayed on the A channel display, and the B channel display is turned off. When receiving a discrete stereo signal or matrix stereo signal,
The frequency of each carrier is displayed on the channel display and the B channel display.

“Example” An example of the present invention will be described below based on the drawings.

Reference numeral 24 denotes an audio signal input terminal using a subcarrier signal of 3 to 5 MHz. To this input terminal 24, an A channel reproducing circuit 25 and a B channel reproducing circuit 26 are connected in parallel to each other. are coupled with indicators 27 and 28 for the reception frequencies of the A channel and B channel, respectively. Among these, the A channel display 27 is connected to a power terminal (+B) for constant display, and the B channel display 28 has a third
A power terminal (+B) is connected via a changeover switch 31.

The output side of the A channel reproduction circuit 25 is
Discrete stereo (hereinafter referred to as DS) contact DS of the first changeover switch 29, multiplex stereo (hereinafter referred to as MX) decoder 32, matrix stereo (hereinafter referred to as MS) decoder 33
Further, the output side of the B channel reproducing circuit 26 is coupled to the MS decoder 33 and the DS contact DS of the second changeover switch 30. Said
The L signal output terminal of the MX decoder 32 is the monaural/multiplex stereo (hereinafter referred to as MN/MX) contact (MN/MX) of the first changeover switch 29.
In addition, the R signal output terminal of the MX decoder 32 is connected to the MN/MX contact (MN/MX) of the second changeover switch 30.
In addition, the L signal output terminal of the MS decoder 33 is connected to the MS contact MS of the first changeover switch 29, and the MS decoder 33 is connected to the MS contact MS of the first changeover switch 29.
The R signal output terminal of 3 is connected to the second selector switch 30.
MS contacts are respectively coupled to MS. Common contacts of the first and second changeover switches 29 and 30 are coupled to an L channel output terminal 34 and an R channel output terminal 35, respectively. In addition, the above MX
Decoder 32 has weak radio waves (MN or MX)
Automatically closes when strong radio waves (DS or MS)
A switch 48 that automatically opens when

Next, in FIG. 2, the front panel 36 of the audio device 6 includes a power on/off button 37, the A channel display 27, and a tuning down button 38.
and up button 39, the display 2 of the B channel
8. Tuning down button 40 and up button 41, memory button 42, manual button 43 to manually select the tuning frequency, DS button 44 corresponding to the DS contact PS, the MS button
It is provided with an MS button 45 corresponding to MS, an MN/MX button 46 corresponding to the MN/MX contact (MN/MX), and an expansion button 47.

In the above configuration, (1) When receiving 6.8MN, first press MN/MX button 4.
Press 6. Then, the first, second, and third changeover switches 29, 30, and 31 are switched to the MN/MX contacts (MN/MX), and the B channel display 28 is not supplied with power and turns off. Here, when the tuning button 38 or 39 is pressed while looking at the A channel display 27, the tuning stops when the target 6.8MHz is displayed. Then, the 6.8MHz signal is reproduced by the A channel reproduction circuit 25,
A monaural (L+R) signal is outputted to L and R signal output terminals 34 and 35 via the MX decoder 32.

(2) When receiving 6.8MX, it is almost the same as the case of 6.8MN, but the MX decoder 32 detects that it is an MX signal, separates it into an L signal and an R signal, and outputs the L and R signals respectively. It is output from output terminals 34 and 35.

(3) When receiving either 6.2 & 6.8MN,
For example, to receive 6.2 MN, first, receive it using the method (1) above using the A channel, and then,
To receive 6.8MN, repeat step (1) above using the same A channel.

(4) When receiving 5.8 & 6.8 MS, use the MS button 45 to switch the first, second, third selector switches 29, 30,
Switch 31 to MS contact (MS). and,
The A channel reproducing circuit 25 searches for 5.8 MHz and displays it on the display 27, and the B channel reproducing circuit 26 searches for 6.8 MHz and displays it on the display 28. Then, MS decoder 45
So, (L+R)+(L-R)=2L, (L+R)-
Perform the calculation of (L-R) = 2R, and calculate L and R respectively.
It is output to output terminals 34 and 35 of.

(5) When receiving 5.58 & 5.76DS, 5.58MHz and 5.58MHz are displayed on A and B channel displays 27 and 28 respectively.
5.76MHz is displayed, and the L signal of the A channel is outputted as is to the L output terminal 34, and the R signal of the B channel is outputted as is to the R output terminal 35.

"Effects of the Invention" Since the present invention is configured as described above, the received frequency can be digitally displayed on the display and precise tuning can be achieved. Additionally, when receiving only one channel, such as a monaural signal or a multiplexed stereo signal, only one display has the display function and the other display is turned off, which prevents operational errors. It has the advantage of being extremely easy to use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the received frequency display device according to the present invention, FIG. 2 is a front view of the panel, FIG. 3 is a front view of a conventional tuning knob, and FIG.
The figure is a block diagram of a satellite broadcast receiving system. 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, 20, 21 ... Tuning knob, 22, 23 ... Scale, 24 ... Input terminal,
25, 26... Regeneration circuit, 27, 28... Display device, 2
9, 30, 31... Selector switch, 32... MX decoder, 33... MS decoder, 34, 35... Output terminal, 36... Front panel, 38, 40... Down button,
39, 41...Up button, 44...DS button, 45...MS
Button, 46...MN/MX button.

Claims (1)

[Claims] 1. A monaural audio signal using a single frequency subcarrier, a multiplex stereo audio signal using a single frequency subcarrier, two audio signals using two different frequency subcarriers, and a matrix using two different frequency subcarriers. In a satellite broadcasting receiving system that selects and reproduces one of a stereo audio signal and a discrete stereo audio signal using subcarriers of three different frequencies, the A channel signal is reproduced from the selected audio signal. a reproduction circuit, a reproduction circuit that reproduces the B channel signal; a digital display that is coupled to the A channel reproduction circuit and constantly displays the frequency of the carrier signal; and a digital display that is coupled to the B channel reproduction circuit and that reproduces the carrier signal. a multiplex stereo decoder connected to the reproduction circuit of the A channel, a matrix stereo decoder connected to the reproduction circuits of both the A and B channels, and the discrete stereo When the audio signal is selected, the outputs of the A and B channel reproduction circuits are switched to be output directly to the L and R audio output terminals, respectively, and the monaural audio signal, multiplex stereo audio signal, or two audio signals is selected. At the same time, the output of the A channel reproduction circuit is switched to be outputted to the L and R audio output terminals via the multiplex stereo decoder, and the power to the digital display of the B channel is cut off. A receiver characterized in that it is equipped with a changeover switch that switches the output of the A/B channel reproduction circuit to the L/R audio output terminals via the matrix stereo decoder when a signal is selected. Frequency display device.