CN85101812A - Shf receiver - Google Patents
Shf receiver Download PDFInfo
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- CN85101812A CN85101812A CN85101812.2A CN85101812A CN85101812A CN 85101812 A CN85101812 A CN 85101812A CN 85101812 A CN85101812 A CN 85101812A CN 85101812 A CN85101812 A CN 85101812A
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Abstract
One receives the device of ultra-high frequency signal, comprises an outdoor parts, an indoor part and a coaxial cable.Outdoor parts includes the transducer that a ultra-high frequency signal that antenna is received converts ultrahigh-frequency signal to, one produces local signal and transports to the local oscillator of transducer, the change over switch of one conversion local signal frequency, and the detection circuit of an operating voltage of outdoor parts is transported in a detection.The conversion of the output signal control transformation switch of detection circuit.Indoor part includes the circuit that a demodulator demodulating VHF signal and produces operating voltage.Coaxial cable transfers to the ultrahigh-frequency signal in the outdoor parts indoor part and operating voltage is transferred to outdoor parts from indoor part.
Description
Technical field
The invention relates to-the ultra-high frequency signal receiving equipment, specifically about-for example receive the receiver of the hyperfrequency broadcast singal that sends from broadcasting satellite.
Prior art is described
Usually, as shown in Figure 1, the SHF receiver that receives the hyperfrequency broadcast singal of broadcasting satellite (not shown) transmission comprises :-antenna 1;-outdoor parts 2; These parts place outdoor with antenna, it act as by antenna, and the electric wave of the hyper band that receives converts the electric wave of super high band to, and amplifies this electric wave.-coaxial cable 3;-indoor part 4 and-television receiver 5.Indoor part 4 and television receiver 5 all place indoor, and outdoor parts 2 converts received signal the signal of super high band to, delivers to indoor part 4 through coaxial cable 3, and indoor part 4 produces vision signal and audio signal again, delivers to television receiver 5.
It should be noted that existing small-power broadcast singal in the hyperfrequency broadcast singal (receive frequency is 11.7 to 12.2 gigahertzs) has high power broadcast signal (receive frequency is 12.2 to 12.7 gigahertzs) again.
Yet if the local oscillation frequency of above-mentioned SHF receiver outdoor parts 2 remains unchanged, the corresponding frequency band of indoor part 4 just is necessary for 1000 megahertzes.This is concerning indoor part 4, is extremely difficult the realization from the angle of circuit.
Thereby in order to allow the indoor part 4 of simple structure can receive the broadcast singal of two different frequencies, the local oscillation frequency of outdoor parts 2 must change.
In order to change the local oscillation frequency of outdoor parts 2, can consider to control the conversion of local oscillation frequency by this root cable between indoor part 4 and outdoor parts 2, connecting a basic machine frequency of oscillation control cable outside the coaxial cable 3 again.Yet, do not wish that from the viewpoint of signal transmission many cables are arranged between outdoor parts 2 and indoor part 4, and, cable-many, will increase the Interface Terminal number of outdoor parts 2, see the indoor parts 2 that bleeds such as also being unfavorable for preventing rainwater from the sealing angle.
Goal of the invention
One of the object of the invention is for a SHF receiver of having improved is provided.
Two of the object of the invention is for a SHF receiver is provided, and this receiver can change the local oscillation frequency of outdoor parts according to frequency acceptance band under the situation that does not increase the number of coaxial cables that connects indoor part and outdoor parts.
Three of the object of the invention is for a SHF receiver is provided, this receiver broken away from from signal transmission and sealing angle consider because the shortcoming that the increase Interface Terminal causes.
Summary of the invention
Can be made into the device of a reception ultra-high frequency signal according to an aspect of the present invention, this device includes:
One outdoor parts, it comprises the conversion equipment that ultra-high frequency signal is converted to ultrahigh-frequency signal, produce the local oscillation device of the local signal of supplying with above-mentioned conversion equipment, change the device of above-mentioned local signal frequency, detection adds to the device of above-mentioned outdoor parts operating voltage, this operational voltage value changes with the variation of above-mentioned ultra-high frequency signal frequency band, and the output circuit of controlling the above-mentioned sniffer of above-mentioned local signal conversion equipment.
One indoor part, it comprises the device of the above-mentioned ultrahigh-frequency signal of demodulation and produces the device of above-mentioned operating voltage.
One is sent to above-mentioned ultrahigh-frequency signal indoor part and transmits above-mentioned operating voltage to the cable unit of above-mentioned outdoor parts from above-mentioned indoor part from above-mentioned outdoor parts.
Below with reference to accompanying drawings, the present invention is described in detail, reference symbol identical in the accompanying drawing is indicated same element and parts.Below narration will progressively clearly show other purpose of the present invention, characteristic and advantage.
The accompanying drawing summary
Accompanying drawing 1 is the schematic diagram of an example of prior art SHF receiver;
Accompanying drawing 2 is the block diagram of an enforcement case of SHF receiver of the present invention;
Accompanying drawing 3 is explanation oscillogram of the present invention.
The description of preferable embodiment
An embodiment referring now to accompanying drawing 2 and accompanying drawing 3 narrations SHF receiver of the present invention.
Among Fig. 2, with the corresponding part of Fig. 1 with identical reference number, be described further no longer in addition.
Among Fig. 2, antenna, reception one hyperfrequency (english abbreviation SHF) broadcast singal S
SHF, by the garden that constitutes outdoor parts 2 parts-linearly polarized wave transducer 6 the circularly polarised ultra-high frequency signal that antenna receives is converted to the linear polarization ultra-high frequency signal then, add to-frequency mixer 8 by-high-frequency amplifier 7.
Reference symbol 9L and 9H indicate local oscillator separately respectively, local oscillator produce respectively signal (being used to receive the small-power broadcast singal) that a frequency can be 10.705 gigahertzs and-frequency is the signal (being used to receive the high power broadcast signal) of 11.2 gigahertzs.The frequency signal that comes from this machine receiver 9L and 9H adds to frequency mixer 8 respectively, and this frequency mixer 8 produces the signal SuHF that its frequency inverted is superfrequency (english abbreviation is uHF) then.This SuHF signal adds to an output 12 through an intermediate frequency amplifier 10 and the appearance of flow resistance outage always 11.
Reference number 13 indication-pressurizers, indoor part 4 is delivered to terminal 12 through coaxial cable 3 general-voltages+B, adds to this pressurizer then, and pressurizer carries out voltage stabilizing to the voltage+B of input.The back also will be mentioned, add to voltage+B that output 12 is used to receive small-power broadcast singal (receive frequency is that 11.7 gigahertzs are to 12.2 gigahertzs) and high power broadcast signal (receive frequency is that 12.2 gigahertzs are to 12.7 gigahertzs) for+10 volts with+15 volts.Pressurizer 13 is stabilized in voltage+B on one setting, delivers to high-frequency amplifier 7 and intermediate frequency amplifier 10 then.Voltage+B also delivers to local oscillator 9L and 9H by local signal change-over circuit 14.
Reference symbol 15 indication-level detecting circuits, this circuit is received from voltage+B that indoor part 4 is transported to lead-out terminal 12, and the level of surveying this voltage be+10 volts or+15 volts.Deliver to local signal change-over circuit 14 from the signal Sd of detection circuit output, as its changeover control signal.When voltage+B is+10 volts, promptly when receiving small-power broadcasting (receive frequency 11.7 to 12.2 gigahertzs), change-over circuit 14 links with local oscillator 9L, when voltage+B is+15 volts, received signal is high power broadcast signal (receive frequency from 12.2 to 12.7 gigahertzs) when promptly receiving high power broadcast, and change-over circuit and local oscillator 9H link.
Thereby, when receiving the small-power broadcast singal, add to local oscillator 9L from the operating voltage of pressurizer 13 output, this local oscillator 9L just exports-frequency be the signal of 10.705 gigahertzs to frequency mixer 8, so just SHF receiver is placed small-power broadcast reception state.On the other hand, when receiving the high power broadcast signal, just add to local oscillator 9H from the operating voltage of pressurizer 13 output, this local oscillator 9H export a frequency be the signal of 11.2 gigahertzs to frequency mixer 8, so just SHF receiver is placed high power broadcast signal accepting state.
Signal S
UHFFor being transformed into the signal of super high band, and delivered to the output 12 of outdoor parts 2, this signal by coaxial cable 3 ,-input terminal 16 and flow resistance outage always hold 17 to tuner 18.Input terminal 16, direct-current blocking-up electric capacity 17 and tuner 18 are the part of indoor part 4.
In tuner 18, select the broadcast singal of predetermined channel by channel selector 19 control tuners 18, and at intermediate-freuqncy signal (FM signal) S of the output generation-selected broadcast singal of tuner 18
IF, this S
IFThe series circuit that signal is controlled (english abbreviation is AGC) amplifier 20, a band pass filter 21 and an amplitude limiter 22 formations through an automatic gain adds to-frequency modulation detector 23.This frequency modulation detector 23 outputs one composite signal, composite signal is by a vision signal S
VWith an audio signal S '
AForm, vision signal comprises-brightness signal Y and-carrier chrominance signal C, audio signal S '
ABe 4 phase shift keyed signals (4
PSK), as shown in Figure 3, this composite signal delivers to again-video amplifier 24 and-audio process 25.
The video amplifier 24 produces video amplification signal S
V, audio process 25 generation-audio signal S
A
Vision signal S with the video amplifier 24 and audio process 25 outputs
VWith audio signal S
A-add to together-(english abbreviation is R to radio frequency
F) transducer 26, this radio frequency converter 26 produces-with-TV signal S that vacant channel is complementary
RF
In the indoor part 4, reference number 27 indication-power circuits, this power circuit are each part power supply of indoor part 4, and transmit an assigned voltage to pressurizer 28.Change-over circuit 29 is that low-power level signal or high-power signal give pressurizer 28 for different reference voltage V according to received signal
RLOr V
RHThen, when receiving the small-power broadcast singal, the voltage+B of pressurizer 28 outputs can be+10 volts, and when reception high power broadcast signal, voltage+B can be+and 15 volts, voltage+
BExchange the terminal 12 that choke 30, terminal 16 and coaxial cable 3 are delivered to above-mentioned outdoor parts 2 through one.
The above is for the structure of SHF receiver of the present invention.This equipment when receiving low-power level signal (receive frequency is 11.7 to 12.2 gigahertzs), voltage+
BThrough the terminal 12 of coaxial cable 3 to outdoor parts 2, its value can be+10 volts from indoor part 4.This voltage+
BCONTROLLED POTENTIAL detection circuit 15 output-operating voltages are to local oscillator 9L, local oscillator 9L just exports-frequency be the signal of 10.705 gigahertzs to frequency mixer, just outdoor parts 2 is placed the operating state that receives the small-power broadcast singal this moment.On the other hand, when receiving the high power broadcast signal (receive frequency is 12.2 gigahertz to 12.7 gigahertzs), the magnitude of voltage that voltage+B adds to terminal 12 places of outdoor parts 2 can be+and 15 volts.These voltage control potential detection circuit 15 output-operating voltages are to local oscillator 9H, local oscillator 9H exports then-frequency be the signal of 11.2 gigahertzs to frequency mixer 8, just outdoor parts 2 is placed the operating state that receives the high power broadcast signal this moment.Thereby this SHF receiver can not only receive the small-power broadcast singal but also receive the high power broadcast signal.
The same with prior art, in embodiment of the present invention, between outdoor parts 2 and indoor part 4, only used a coaxial cable 3.And, can under the situation that does not increase number of coaxial cables, change the frequency acceptance band of the local oscillation frequency of outdoor parts 2, thereby eliminate the disadvantage that signal transmission that the increase because of number of coaxial cables brings and seal aspect are seen.
Though such scheme is the local oscillation frequency of exterior part 2 local oscillator 9L of transfer chamber and 9H respectively, also can use-local oscillator that its local oscillation frequency changes with receive frequency.
More than narration clearly illustrates that: the present invention can be under the situation that does not increase the number of coaxial cables between outdoor parts 2 and the indoor part 4, according to the frequency shift local oscillation frequency that is received.Thereby the present invention also can prevent because of increasing the unfavorable factor that the angle from signal transmission and sealing that cable produces is considered.
More than narration has only provided a preferable embodiment of the present invention.Obviously, for a people who is familiar with technology, can not deviate from the spirit or scope of invention fully and carry out many modifications and variation, so scope of the present invention should be determined by appended requirement.
Claims (7)
1, one receives the equipment of ultra-high frequency signal, this equipment comprises an outdoor parts, one indoor part and a cable unit, it is characterized by: above-mentioned outdoor parts comprises the conversion equipment that ultra-high frequency signal is converted to ultrahigh-frequency signal, produce local signal and add to the local oscillation device of above-mentioned conversion equipment, change the device of above-mentioned local signal frequency, detection adds to the device of above-mentioned outdoor parts operating voltage, this operating voltage changes with the variation of above-mentioned ultra-high frequency signal frequency band, and the output circuit of controlling the above-mentioned sniffer of above-mentioned local signal frequency conversion apparatus, above-mentioned indoor part comprises the device of the above-mentioned ultrahigh-frequency signal of demodulation and produces the device of above-mentioned operating voltage that above-mentioned cable unit is sent to above-mentioned ultrahigh-frequency signal indoor part and transmits above-mentioned operating voltage to above-mentioned outdoor parts from above-mentioned indoor part from above-mentioned outdoor parts.
2, according to claim 1 desired equipment, it further is characterized as: above-mentioned local oscillator means comprises-first oscillator and-the second oscillator, the frequency of oscillation difference of this two oscillator, and a moment have only an output signal to transport to above-mentioned conversion equipment.
3, according to claim 2 desired equipment, it further is characterized as the pressurizer that above-mentioned outdoor parts also comprises a stable operating voltage, and the output of pressurizer selects to deliver in two oscillators one through above-mentioned change over switch.
4, according to claim 1 desired equipment.It is characterized by: above-mentioned local oscillation device is a variable oscillator, and its frequency change is controlled by above-mentioned local signal frequency conversion apparatus.
5, according to claim 1 desired equipment, it is characterized by: above-mentioned conversion equipment comprises that one converts the circularly polarised ultra-high frequency signal transducer of linear polarization ultra-high frequency signal to, the amplifier of-amplification linear polarization ultra-high frequency signal,-with the frequency mixer of above-mentioned amplifier output signal and above-mentioned local signal mixing, above-mentioned frequency mixer produces above-mentioned ultrahigh-frequency signal, above-mentioned demodulating equipment comprises-receives the tuner of ultrahigh-frequency signal,-be used to select the channel selection switch of above-mentioned ultrahigh-frequency signal channel, above-mentioned channel selection switch control tuner selective channel, the detector of the above-mentioned tuner output signal of-detection, and the device of handling detector output signal, above-mentioned processing unit produces respectively-vision signal and-audio signal.
6, according to claim 5 desired equipment, it further is characterized as: this equipment also comprises-receives-and circularly polarised ultra-high frequency signal and this signal is delivered to the antenna assembly of above-mentioned transducer.
7, according to claim 6 desired equipment, it further is characterized as: the said equipment also comprises the monitoring arrangement that receives above-mentioned video and above-mentioned audio signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101812.2A CN1004320B (en) | 1985-04-01 | 1985-04-01 | Shf receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101812.2A CN1004320B (en) | 1985-04-01 | 1985-04-01 | Shf receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101812A true CN85101812A (en) | 1987-01-10 |
| CN1004320B CN1004320B (en) | 1989-05-24 |
Family
ID=4792079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85101812.2A Expired CN1004320B (en) | 1985-04-01 | 1985-04-01 | Shf receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004320B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102461027A (en) * | 2009-05-20 | 2012-05-16 | 阿斯特里姆有限公司 | Content broadcast |
-
1985
- 1985-04-01 CN CN85101812.2A patent/CN1004320B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102461027A (en) * | 2009-05-20 | 2012-05-16 | 阿斯特里姆有限公司 | Content broadcast |
| CN102461027B (en) * | 2009-05-20 | 2016-03-02 | 阿斯特里姆有限公司 | Content broadcast |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1004320B (en) | 1989-05-24 |
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