JPH05291976A - Satellite broadcast receiver - Google Patents

Abstract

PURPOSE:To make the installation position of an antenna remote and to improve the reception performance by improving the performance by high-selectivity tuning for the desired signal in the higher frequency (more than 1GHz), and enabling the selective tuning and frequency conversion in a remote antenna section. CONSTITUTION:The selective tuning of the desired signal is remotely controlled by means of a frequency designation control signal generated by a control signal generation device J by inputting an instruction 27 to a reception section L of the receiver main body and a frequency synchronizing controller K using a selective synchronizing oscillator consisting of a phase synchronizing oscillator H in a remote antenna section. A phase demodulation system demodulating the output of a binary noise generator 22 is adopted as a control signal, thereby the control distance can be expanded.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a high carrier frequency (1 GHZ-20 GHZ) for reception of television waves using satellites.
The present invention is applied to a frequency-modulated signal or phase-modulated signal receiving device according to the present invention to improve the receiving performance.

[0002]

2. Description of the Related Art A conventional apparatus employs a system in which several television broadcast radio waves existing in a wide band (300 MHZ) are frequency-converted at a time and then a desired broadcast radio wave is selected. The reason for this is the high carrier frequency (1GHZ-20GH
Since it is difficult to arbitrarily select and amplify the desired radio wave in the Z) band, the above-mentioned method in which the performance is sacrificed was used. Also,
There is a technical problem in the configuration of the device such that frequency conversion is performed twice or more.

[0003]

High carrier frequency band (1G
HZ-20GHZ) to selectively tune and amplify desired radio waves to improve the signal-to-noise ratio, and to remotely control selective tuning and frequency conversion of desired radio waves at an antenna unit installed outdoors, etc. The transmission distance and reception performance are increased by transmitting as a frequency-limited frequency that is easy to handle.

[0004]

[Means for Solving the Problems] Using a phase-locked oscillating device, it is possible to set a necessary bandwidth by means for selectively tuning a designated desired signal by a control signal. Further, by utilizing the control signal by the two-phase (multi-phase) phase modulation by the binary noise, the selective tuning of the desired signal and the remote control of the frequency conversion can be performed in the antenna unit installed outdoors. Also, by devising the control signal and the control circuit, it is possible to ensure the instruction and change setting of the synchronous frequency of the phase-locked oscillator, and to enable selective tuning of the desired received signal.

[0005]

By improving the selective reception of the desired signal and the selective control of the tuning frequency in the high frequency (1GHZ-20GHZ) band, the satellite TV radio wave reception performance can be improved and the installation flexibility of the antenna unit can be expanded. The control distance can be extended. The phase-locked oscillator can perform frequency selective tuning with high selectivity by setting a control filter, and becomes an excellent signal receiver if the instruction control of the synchronizing frequency is properly performed. INDUSTRIAL APPLICABILITY The present invention utilizes the devise of the control signal and the characteristics of the phase synchronization path to perform the setting control for the instructed frequency, and the phase modulation by the binary noise does not cause any interference to the other, and is also strong against the interference from the other. A signal is created to enable remote control. The demodulation of the phase-modulated wave by the binary noise can be achieved by the phase-locked oscillator at the same time as the phase-locked oscillation by the multiplied wave of the control signal, which greatly simplifies the controller. That is, the phase-locked oscillator is a frequency selective receiving device as well as a frequency instruction control signal receiving device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 (k) is a system diagram of an antenna receiving section of conventional satellite broadcasting. 1 is an antenna, 2 is a high frequency amplifier, 3 is a mixer, 5 is a local oscillator, 4 is an intermediate frequency amplifier, and 6 is a DC power supply. Therefore, the high frequency amplifier 2 or the intermediate frequency enhancer 4 can be replaced with the phase locked oscillator according to FIG. 1H to improve the commonality with the conventional device. In FIG. 1 (H), 8 is a received signal input, 9 is a buffer amplifier, 10 is a phase comparator, F1 is a filter that passes a received modulated signal, and 11 is a voltage (current) controlled oscillator, which oscillates synchronously with the received frequency. To do. Reference numeral 14 is a phase comparator which receives a frequency designation control signal, and F2 is a narrow band filter which controls a voltage (current) controlled oscillator via an output resistor R0. A buffer (buffer) 15 outputs the output of the voltage (current) controlled oscillator 11 to the next stage or the cable line 16. Reference numeral 12 is a control signal detector (or a synchronization detector of the phase-locked oscillator), which detects a signal for controlling the switch S1 or S2 from the output of the phase comparator 14. Reference numeral 13 is a switch control drive device based on 12 control signals. The devices 12 and 13 and the switches S1 and S2 are not necessarily required devices. For example, when a slight error between the frequency due to the frequency control signal and the received signal frequency causes a problem, the switch S1 is closed and the phase-locked oscillation frequency. Is specified by a control signal, and then the switch S1 is opened and S2 is closed, which is one example of solving the above problem.

FIG. 2 shows another embodiment, which is an overall system diagram of a satellite broadcast television radio wave receiving apparatus. 2 shows a system diagram of the outdoor antenna and the frequency converter, and a part shown by arrow m in FIG. 2 shows a system diagram of the indoor main unit. First, the outdoor system diagram of FIG. 2 will be described. A part (H) surrounded by a dotted line is a local oscillator, which is a phase-locked oscillator composed of 18 phase comparators, F3 filters, 5 voltage (current) controlled oscillators and 19 frequency dividers. Therefore, the output oscillation frequency is determined by 18 input control signals. FIG. 2K is a system diagram including tuning reception using a phase-locked oscillator and further including a frequency converter, and operates in the same manner as in FIG. Explaining the difference, because the local oscillation frequency is specified by the control signal with respect to the reception frequency,
The mixer output intermediate frequency of 3 becomes 1 constant frequency. 4 is an intermediate frequency band amplifier, and 17 is a frequency divider, so that the control signal frequency of the phase comparator 14 becomes lower than that in the case of FIG. In the system diagram of the indoor main body part indicated by arrow m in FIG. 2, (J) is a system diagram of the control signal generator, in which 29 is a clock generator, 30 is a phase comparator, and F4 is a filter.
Reference numeral 20 denotes a voltage (current) controlled oscillator, and the carrier frequency is determined by the designated frequency division ratio control input of the frequency divider 21. 22
Is a binary noise generator, and the control signal subjected to the two-phase (multi-phase) phase modulation by the phase modulator 23 is output to the cable line 28 via the buffer amplifier 24. A part (L) surrounded by a dotted line in FIG. 2 is a receiving part system diagram of the main body device, 25 is an intermediate frequency receiving device, and 26 is an instruction number 21 for setting the receiving frequency by the instruction input of 27. It is a control device for giving a frequency switching instruction signal and a sweep signal output to a voltage (current) controlled oscillator of 20 to a frequency divider.

FIG. 3 shows another embodiment of the present invention, in which the portion indicated by arrow f in FIG. 3 is an antenna and a frequency converter.
A portion indicated by an arrow m in FIG. 3 is a main body device. The reception frequency conversion of this embodiment is performed by using the frequency divider 8 which constitutes the phase control path, and is output to the cable line 16 via the buffer amplifier 15. In the receiver of the main body, tuning reception and baseband demodulation are performed by the phase-locked oscillator (H) surrounded by a dotted line.

FIG. 4 shows one voltage (current) controlled oscillator 3,
On the other hand, it is a specific example of the phase-locked oscillator having two control paths. 1 is a received signal, 2 is a frequency designation control signal, F
1 and F2 are filters, 4 is an adder, 5 is a control signal (synchronization) detector, and 6 is a device for controlling and driving the control switches S1 and S2. Reference numeral 7 is a mixer, 8 is a local oscillator, 9 is an intermediate frequency amplifier, and 16 is a cable line. The essential points of the operation of the constituent circuits will be described. The semiconductor devices Tr1 and Tr2 form a phase comparator in which the emitters are coupled and the resistor R5 is shared. The output of the voltage (current) controlled oscillator 3 is the transformer T1,
Is injected into the emitter coupling part of Tr1 and Tr2 via the capacitor C3, and is compared with the received signal 1 and the control signal 2. While the control switch S1 is closed by the operations of 5 and 6, since the emitter output section of the semiconductor device Tr3 has a low impedance, the control path by the reception signal is closed, and conversely, the control path by the control signal closes both the filters F1 and F2. Drive the voltage (current) controlled oscillator via. As a result, the oscillation frequency is set by the frequency designation control signal, and when the switch S1 is opened and then the switch S2 is closed, the phase-locked oscillating device tuned to the received signal is obtained and can be used as a selective amplifying device for the received signal.

FIG. 5 shows an example of characteristics of the filters F1 and F2 shown in FIGS. 1, 2, 3 and 4. (H1) of FIG.
Then, when the control switches S1 and S2 are open, the band of the filter F1 is 0 to f1 frequency and the gain is G1.
I will show you that. The band of the filter F2 is from 0 to f2 and the gain is G2. When the control switch S2 is closed, only the gain is GS2. (H2) of FIG. 5 shows that when the control switch S1 is closed, the gain of the control path due to the received signal becomes Gs1 and the band due to the control signal is expanded to f1.

FIG. 6 is an explanatory diagram showing an example of a control signal generation time and a signal waveform. Referring to FIG. 2, the item No. 1 generates a pulse for the time t1 from the time t0 by the instruction input 27 of FIG. And control device 26
Sends a frequency division ratio change instruction signal at time t1 from time t0, and sets carrier wave frequency of 20 to p1 at the time shown in item No. 4.
To p2. Item No. 3 is a sweep signal generated by a commercial power source, etc.
0 is supplied. Item No. 5 shows a waveform in which synchronization detection is performed using the output signal of the intermediate frequency receiving device of 25, and the sweep signal is controlled at t2 time. Item Nos. 6 and 7 show the control timings of the control switches S1 and S2 that operate in association with the control signal.

[0012]

EFFECTS OF THE INVENTION With respect to radio waves in a high frequency range where tuning reception is difficult, high selectivity tuning reception is possible, performance is improved, and a desired signal is high even for a receiving device installed in a remote place. Enables selective tuning reception and frequency conversion.

[0013]

[Brief description of drawings]

FIG. 1 (K) is a system diagram showing a conventional antenna unit and a frequency conversion unit, and FIG. 1 (H) is a system diagram of a receiver using the phase-locked oscillator of the present invention. ..

FIG. 2 is an overall system diagram showing an embodiment of the present invention including a remote receiving unit and a main body receiving unit.

FIG. 3 is a system diagram showing another embodiment of the present invention.

FIG. 4 is a combination system diagram with an electronic circuit showing a specific configuration example of a main part of the present invention.

FIG. 5 shows an operating characteristic diagram of a filter used in the present invention.

FIG. 6 is an explanatory diagram showing an example of control timings and control signal waveforms of the control system used in the present invention.

Claims (9)

[Claims] 1. A phase-locked oscillator having a control path for a reception signal and a control path for frequency setting for one voltage (current) controlled oscillator, a control signal generator by inputting a frequency setting instruction signal, and a control signal transmission path. A phase-locked oscillator that performs selective tuning amplification of a desired received signal frequency by transmitting a frequency setting control signal and receiving and demodulating the control signal by the phase-locked oscillator. 2. A phase-locked oscillating device and a mixer which generate a defined local oscillation frequency by synchronizing with a specified frequency by receiving and demodulating the frequency specifying control signal according to claim 1.
The receiving device according to claim 1, which performs selective amplification and frequency conversion of a received signal. 3. A phase-locked oscillator according to claim 1, which selectively tunes a received signal, a frequency converter (3 and 5 in FIG. 1), and a phase-locked oscillator according to claim 1, which selectively tunes a conversion frequency.
2. A control signal generator for inputting a frequency setting instruction signal, comprising: transmitting a frequency setting control signal by inputting the frequency setting instruction signal, thereby performing tuning amplification of the received signal and tuning amplification of the converted frequency. The receiving device according to item 2. 4. A phase comparator (14 in FIG. 1) that receives a frequency-specified control carrier wave and detects a change in frequency, a control timing generator (12 in FIG. 1), a drive controller (13 in FIG. 1), and The control switch S1 is provided, and the control path gain of the voltage (current) controlled oscillator by the received signal is suppressed by closing the predetermined time control switch S1 by changing the carrier frequency of the control signal according to the received frequency change instruction, thereby specifying the frequency. Both control paths (Fig. 1)
4. The signal receiving apparatus according to claim 1, wherein the time series control of opening the control switch S1 is performed after the high-speed frequency setting is performed by the filters (F1 and F2). 5. The receiving device according to claim 4, further comprising a control switch S2 (S2 in FIG. 1), which sets the phase-locked oscillating device to a specified frequency by a frequency specifying control signal, and then sets a control path by a desired receiving signal. The receiving device according to claim 1, 2, 3, or 4, which performs control to close the control switch S2 after the operating state (opening the switch S1). 6. As a frequency designation control signal, a designated carrier (No. 4 in FIG. 6) is input to a frequency setting instruction input (No. 1 in FIG. 6).
(P1 of FIG. 6 No. 2), the signal is frequency-modulated by the signal (t1 period of No. 2 in FIG. 6) and transmitted, and the next switched carrier wave (p2 of No. 4 of FIG. 6) is a sweep signal (No. 3 in FIG. 6. The phase-locked oscillator frequency designation control method according to claim 4, wherein the control signal generator is used for frequency-modulating and transmitting during t2 period. 7. The frequency-specific carrier according to claim 1, 2, 3, 4, 5 and the frequency-modulated carrier according to claim 6, further 2
The receiving apparatus according to claim 1, 2, 3, 4, and 5, wherein the frequency designation control signal is formed by two-phase (multi-phase) phase modulation (23 in FIG. 2) by value noise (22 in FIG. 2). 8. A phase-locked oscillator having two phase control paths, one path being a transmission path for a modulation signal,
Frequency divider (8 in Fig. 3) on the other frequency designated control path
A frequency conversion device that uses a phase-locked oscillator that detects a divided reception signal as an intermediate frequency signal by inserting the. 9. A receiving device for demodulating a received signal by performing phase-locked oscillation with a harmonic of an intermediate frequency by a phase-locked oscillator (H in FIG. 3) as the intermediate frequency receiving device according to claim 8.