CN1791186A - Audio and video wireless transmitting device - Google Patents
Audio and video wireless transmitting device Download PDFInfo
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- CN1791186A CN1791186A CN 200510101933 CN200510101933A CN1791186A CN 1791186 A CN1791186 A CN 1791186A CN 200510101933 CN200510101933 CN 200510101933 CN 200510101933 A CN200510101933 A CN 200510101933A CN 1791186 A CN1791186 A CN 1791186A
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Abstract
The invention relates to a wireless emission device with audio/video transmission function and emission frequency point controlled by phase-locking loop and SCM, which comprises an audio primary modulation circuit, a video preemphasis circuit, a voltage-controlled oscillatory circuit, a amplification circuit, and a phase-locking loop circuit with a phase-locking loop chip, a SCM, a switch signal circuit, a crystal oscillation and loop filter. This invention is simple and high reliable with 8MHZ bandwidth, and can be used to monitor in wide range.
Description
[technical field]
The present invention relates to wireless launcher, particularly a kind of have the wireless launcher audio frequency and video transfer function, that adopt phase-locked loop and Single-chip Controlling emission frequency.
[background technology]
In the prior art, the switching device of vision signal and radiofrequency signal is more, and emitter is less, basically can be divided into two kinds, a kind of is the emitter of similar TV station, and this device profile is huge, complex structure, another kind is the emitter of similar mobile phone, paging, and this emitter is the some emission of single-frequency, narrow bandwidth.
[summary of the invention]
The objective of the invention is to solve the less radio-frequency emission of video, audio signal, and adopt phase-locked loop and Single-chip Controlling emission frequency.
The technical solution adopted for the present invention to solve the technical problems is: a kind of audio-video wireless emitting device, comprise audio frequency primary modulation circuit, video preemphasis circuit, Voltage-Controlled oscillation circuit and amplifying circuit, and also comprise phase-locked loop circuit; Described phase-locked loop circuit comprises phase-locked loop chip, single-chip microcomputer, switching signal circuit, crystal oscillator and loop filter;
Described switching signal circuit is by switching the state of two switches, to four kinds of different signals of single-chip microcomputer input;
Described single-chip microcomputer is handled four kinds of signals of described input, and output serial clock signal, data-signal and enable signal are to phase-locked loop chip;
Described phase-locked loop chip adopts two-wire system, and its output to crystal oscillator, single-chip microcomputer, voltage controlled oscillator is handled, and the output variable voltage signal is to loop filter;
Described loop filter carries out outputing to after the filtering input of Voltage-Controlled oscillation circuit to described variable voltage signal.
In apparatus of the present invention, described switching signal circuit comprises the 11 resistance, the 12 resistance, the 16 resistance, the 17 resistance, first switch and second switch; One end ground connection of first switch, the other end links to each other with the two-way I/O mouth of single-chip microcomputer by the 16 resistance; One end ground connection of second switch, the other end links to each other with another two-way I/O mouth of single-chip microcomputer by the 17 resistance; Above-mentioned two I/O mouths link to each other with power supply with the 12 resistance by the 11 resistance respectively.
In apparatus of the present invention, the radio-frequency (RF) signal input end of described phase-locked loop chip is electrically connected with the output of described Voltage-Controlled oscillation circuit, its crystal oscillator input links to each other with an end of described crystal oscillator, its Enable Pin, serial clock signal input, data-signal input link to each other with one-chip machine port respectively, it is adjusted, and voltage output end links to each other with the input of loop filter and pass through the 8th resistance links to each other with power supply, and its charge inside pulse output end links to each other with an end of the polyphone branch road that the tenth electric capacity and the 12 electric capacity are formed; The other end of described polyphone branch road links to each other with the input of loop filter; The other end of described crystal oscillator is by the 13 capacity earth; Also comprise the 6th resistance, be connected in the 12 electric capacity two ends in parallel.
In apparatus of the present invention, described loop filter comprises the 7th resistance, the 9th resistance, the tenth resistance and the 11 electric capacity; One end of the 7th resistance is electrically connected with phase-locked loop chip as the input of loop filter, and the other end links to each other with an end of the polyphone branch road that the 11 electric capacity is formed with an end, the tenth resistance of the 9th resistance; The other end ground connection of described polyphone branch road; The other end of the 9th resistance links to each other with the input of described Voltage-Controlled oscillation circuit as the output of loop filter.
In apparatus of the present invention, described Voltage-Controlled oscillation circuit mainly comprises variable capacitance diode, second inductance, the 24 electric capacity, the 3rd electric capacity and second triode; The plus earth of described variable capacitance diode, its negative electrode is electrically connected with the output of described audio frequency primary modulation circuit, video preemphasis circuit and phase-locked loop circuit as the input of Voltage-Controlled oscillation circuit, and the polyphone branch road of forming by second inductance and the 24 electric capacity links to each other with the base stage of second triode; The collector electrode of second triode is electrically connected with power supply, and is electrically connected with amplifying circuit as the output of Voltage-Controlled oscillation circuit, and its emitter is by the 21 grounding through resistance; The 3rd electric capacity is connected across between the collector electrode and emitter of second triode; One end of the 30 resistance links to each other with power supply, and the other end links to each other with the 19 resistance one end, first microstrip line, one end and the 15 electric capacity one end; The 19 resistance other end links to each other with the base stage of second triode; The other end of first microstrip line links to each other with the collector electrode of second triode; The other end ground connection of the 15 electric capacity; The 25 electric capacity cross-over connection is between the base stage and emitter of second triode; The 4th electric capacity one end links to each other other end ground connection with the emitter of second triode.
In apparatus of the present invention, described audio frequency primary modulation circuit mainly comprises second electric capacity, the 6th electric capacity, first inductance and first triode; The base stage of described first triode is as the input input audio signal of audio frequency primary modulation circuit, and its collector electrode is electrically connected with power supply, and its emitter is electrically connected with described Voltage-Controlled oscillation circuit as audio frequency primary modulation circuit; One end of the 6th electric capacity links to each other with the base stage of first triode, and the other end links to each other with first inductance, one end; The other end ground connection of first inductance; The second electric capacity cross-over connection is between the collector electrode and emitter of first triode; One end of first resistance links to each other with power supply, and the other end links to each other with an end of second resistance, first triode and second electric capacity; The other end of second resistance links to each other with the base stage of first triode; The other end of second electric capacity links to each other with the emitter of first triode; The end that first power transformation is held links to each other its other end ground connection with the tie point of the 6th electric capacity with first inductance; The 3rd resistance links to each other other end ground connection with an end of the parallel branch that the 5th electric capacity is formed with the emitter of first triode.
In apparatus of the present invention, described video preemphasis circuit comprises the 25 resistance, the 28 resistance, the 29 resistance and the 17 electric capacity; One end of the parallel branch that the 17 electric capacity and the 29 resistance are formed is as the input of video preemphasis circuit, incoming video signal, and link to each other with an end of the 28 resistance, its other end is electrically connected with described Voltage-Controlled oscillation circuit as the output of video preemphasis circuit, and links to each other with an end of the 25 resistance; The other end ground connection of the 28 resistance; The other end ground connection of the 25 resistance.
In apparatus of the present invention, described amplifying circuit comprises the 13 resistance, the 15 resistance, second microstrip line and the 3rd triode; The base stage of described the 3rd triode is electrically connected with described Voltage-Controlled oscillation circuit as the input of amplifying circuit, its grounded emitter, the polyphone branch road that its collector electrode is formed by the 13 resistance and first microstrip line links to each other with power supply, and is electrically connected with transmitting antenna as the output of amplifying circuit; One end of the 15 resistance links to each other with the base stage of the 3rd triode, other end ground connection.
An improvement of the present invention is, also comprises filter circuit: comprise the 4th resistance and the 8th electric capacity; One end of the 4th resistance links to each other with an end of audio input end and the 8th electric capacity, and the other end links to each other with the input of audio frequency primary modulation circuit; The other end ground connection of the 8th electric capacity.
Another improvement of the present invention is, also comprises the polyphone branch road that resistance and electric capacity are formed, as the isolation coupling circuit, be connected between audio frequency primary modulation circuit and the Voltage-Controlled oscillation circuit, and between video preemphasis circuit and the Voltage-Controlled oscillation circuit.
Apparatus of the present invention also comprise a biasing circuit: comprise the 20 resistance, the 23 resistance, the 27 resistance, the 9th electric capacity and the 19 electric capacity; The polyphone branch road that the 27 resistance and the 23 resistance are formed an end link to each other with power supply, the other end links to each other with the input of Voltage-Controlled oscillation circuit; The 9th electric capacity one end links to each other other end ground connection with an end of the parallel branch that the 20 resistance is formed with the tie point of the 27 resistance and the 23 resistance; One end of the 19 electric capacity links to each other with power supply, other end ground connection.
Emitter of the present invention is simple in structure, can realize the less radio-frequency emission of video, audio signal, and bandwidth can reach 8MHz.Owing to adopted phase-locked loop and single-chip microcomputer control technology, make the frequency stability height, image stabilization is clear, sound is undistorted.Can be applicable to the old man of family, child's monitoring; The residential area monitoring; The parking lot monitoring; Video conference etc.
[description of drawings]
Fig. 1 is the circuit structure schematic diagram of apparatus of the present invention sound intermediate frequency input.
Fig. 2 is the circuit structure schematic diagram of video inputs in apparatus of the present invention.
Fig. 3 is the schematic diagram of voltage-controlled oscillator circuit in apparatus of the present invention.
Fig. 4 is the biasing circuit of voltage-controlled oscillator circuit in apparatus of the present invention.
Fig. 5 is the structure principle chart of apparatus of the present invention output amplifying circuit.
Fig. 6 is the structure principle chart of phase-locked loop circuit in apparatus of the present invention.
[embodiment]
With specific embodiment the present invention is further elaborated with reference to the accompanying drawings below.
A kind of audio-video wireless emitting device comprises audio frequency primary modulation circuit 1, video preemphasis circuit 2, Voltage-Controlled oscillation circuit 3 amplifying circuits 4 and phase-locked loop circuit 5.
As shown in Figure 1, the circuit of audio input end comprises filter circuit 11, audio frequency primary modulation circuit 1 and isolation coupling circuit 13 successively.Filter circuit 11 is used for filtering the noise of audio signal, the rc filter circuit of being made up of the 4th resistance R 4 and the 8th capacitor C 8: an end of the 4th resistance R 4 links to each other with an end of audio input end A and the 8th capacitor C 8, and the other end links to each other with the input of audio frequency primary modulation circuit 1; The other end ground connection of the 8th capacitor C 8.
The Colpitts oscillation circuit that audio frequency primary modulation circuit 1 mainly is made up of second capacitor C 2, the 6th capacitor C 6, first inductance L 1 and the first triode Q1: the base stage of the first triode Q1 is electrically connected with audio input end A by filter circuit 11 as the input of audio frequency primary modulation circuit 1, its collector electrode is electrically connected with power supply VCC1 by first resistance R 1, and its emitter is electrically connected with Voltage-Controlled oscillation circuit 3 by isolation coupling circuit 13 as the output of audio frequency primary modulation circuit 1.One end of the 6th capacitor C 6 links to each other with the base stage of the first triode Q1, and the other end links to each other with first inductance L, 1 one ends.The other end ground connection of first inductance L 1; 2 cross-over connections of second capacitor C are between the collector electrode and emitter of the first triode Q1.Also comprise the biasing circuit that first resistance R 1, second resistance R 2, the 3rd resistance R 3, first power transformation appearance WC1 and the 5th capacitor C 5 are formed: an end of first resistance R 1 links to each other with power supply VCC1, and the other end links to each other with an end of second resistance R 2, the first triode Q1 and second capacitor C 2.The other end of second resistance R 2 links to each other with the base stage of the first triode Q1.The other end of second capacitor C 2 links to each other with the emitter of the first triode Q1.The end that WC1 is held in first power transformation links to each other its other end ground connection with the 6th capacitor C 6 with the tie point of first inductance L 1.The 3rd resistance R 3 links to each other other end ground connection with an end of the parallel branch that the 5th capacitor C 5 is formed with the emitter of the first triode Q1.Will carry out primary modulation to audio signal is in order to improve the isolation of audio ﹠ video signal, make the frequency range of signal obtain corresponding raising, voice signal is modulated separately to improve tonequality, like this, audio signal after this raising frequency just can be modulated onto on the required frequency in Voltage-Controlled oscillation circuit better, makes the sound that receives undistorted.
The polyphone branch road that isolation coupling circuit 13 is made up of the 5th resistance R 5 and the 7th capacitor C 7 is connected between audio frequency primary modulation circuit 1 and the Voltage-Controlled oscillation circuit 3.
As shown in Figure 2, the circuit of video inputs comprises video preemphasis circuit 2 and isolation coupling circuit 23 successively.Video preemphasis circuit 2 comprises the 25 resistance R the 25, the 28 resistance R the 28, the 29 resistance R 29 and the 17 capacitor C 17.One end of the parallel branch that the 17 capacitor C 17 and the 29 resistance R 29 are formed is as the input E of video preemphasis circuit 2, incoming video signal, and link to each other with an end of the 28 resistance R 28, its other end is electrically connected with Voltage-Controlled oscillation circuit 3 by isolation coupling circuit 23 as the output of video preemphasis circuit 2, and links to each other with an end of the 25 resistance R 25.The other end ground connection of the 28 resistance R 28.The other end ground connection of the 25 resistance R 25.Wherein, R28 and R25 are used for impedance matching, reduce distortion, C17 and R29 be used for the HFS of signal improve, low frequency is constant, with in the compensation transmission of wireless signals process to the loss of vision signal HFS, reduce distortion, when receiving, image will be more clear like this; Simultaneously, R28, R29, R25 also carry out filtering and high boost processing to vision signal.The polyphone branch road that isolation coupling circuit 23 is made up of the 24 resistance R 24 and the 20 capacitor C 20 is connected between video preemphasis circuit 2 and the Voltage-Controlled oscillation circuit 3.Isolation coupling circuit 13 and 23 is used to improve the isolation of Voice ﹠ Video signal, and modulated audio signal and vision signal addition are sent into homophony system circuit, and promptly Voltage-Controlled oscillation circuit 3.
As shown in Figure 3, Voltage-Controlled oscillation circuit 3 mainly is by variable capacitance diode VD1, second inductance L 2, the capacitance connecting three point type oscillator that the 24 capacitor C 24, the 3rd capacitor C 3 and the second triode Q2 form: the plus earth of variable capacitance diode VD1, its negative electrode is electrically connected by the isolation coupling circuit with the output of audio frequency primary modulation circuit 1 and video preemphasis circuit 2 as the input B of Voltage-Controlled oscillation circuit 3, and links to each other with the base stage of the second triode Q2 with the 24 capacitor C 24 by second inductance L 2; The collector electrode of the second triode Q2 is electrically connected with power supply VCC1, and is electrically connected with amplifying circuit 4 as the output C of Voltage-Controlled oscillation circuit 3, and its emitter is by the 21 resistance R 21 ground connection; The 3rd capacitor C 3 is connected across between the collector electrode and emitter of the second triode Q2.Also comprise the biasing circuit that the 19 resistance R the 19, the 21 resistance R the 21, the 30 resistance R 30, first microstrip line, the 4th capacitor C the 4, the 15 capacitor C 15 and the 25 capacitor C 25 are formed: an end of the 30 resistance R 30 links to each other with power supply VCC1, and the other end links to each other with the 19 resistance R 19 1 ends, first microstrip line, one end and the 15 capacitor C 15 1 ends; The 19 resistance R 19 other ends link to each other with the base stage of the second triode Q2; The other end of first microstrip line links to each other with the collector electrode of the second triode Q2; The other end ground connection of the 15 capacitor C 15; 25 cross-over connections of the 25 capacitor C are between the base stage and emitter of the second triode Q2; The 4th capacitor C 4 one ends link to each other other end ground connection with the emitter of the second triode Q2.The effect of this Voltage-Controlled oscillation circuit be the frequency modulation(FM) of audio-video signal to required frequency, by changing the input voltage of Voltage-Controlled oscillation circuit, thereby can change the Voltage-Controlled oscillation circuit output signal frequency, making transmits can outwards launch on a frequency, helps receiving system and receives targetedly transmitting.
Also comprise biasing circuit 33, as shown in Figure 4, comprise the 20 resistance R the 20, the 23 resistance R the 23, the 27 resistance R 27, the 9th capacitor C 9 and the 19 capacitor C 19.The polyphone branch road that the 27 resistance R 27 and the 23 resistance R 23 are formed an end link to each other with power supply VCC1, the other end links to each other with the input of Voltage-Controlled oscillation circuit 3; The 9th capacitor C 9 one ends link to each other other end ground connection with an end of the parallel branch that the 20 resistance R 20 is formed with the tie point of the 27 resistance R 27 and the 23 resistance R 23.One end of the 19 capacitor C 19 links to each other with power supply VCC1, other end ground connection.Wherein resistance R 27 and R20 form bleeder circuit, and for Voltage-Controlled oscillation circuit 3 provides a stable input voltage, capacitor C 19 and C1 are used for filtering.
As shown in Figure 5, circuit of output terminal mainly comprises amplifying circuit 4 and transmitting antenna TX.Amplifying circuit 4 comprises the 13 resistance R the 13, the 15 resistance R 15 and the 3rd triode Q3.The base stage of the 3rd triode Q3 is electrically connected with Voltage-Controlled oscillation circuit 3 by isolation capacitance C02 as the input of amplifying circuit 4, its grounded emitter, its collector electrode links to each other with power supply VCC1 with microstrip line by the 13 resistance R 13, and is electrically connected with transmitting antenna by isolation capacitance C01 as the output of amplifying circuit 4.One end of the 15 resistance R 15 links to each other with the base stage of the 3rd triode Q3, other end ground connection.This amplifying circuit mainly is that the output signal of Voltage-Controlled oscillation circuit is carried out power amplification, improves the energy that transmits, and compensation is transmitted the energy that is lost because of signal in air, make signal can be launched into farther distance.
As shown in Figure 6, circuit of the present invention also comprises phase-locked loop circuit 6, is made up of phase-locked loop chip U1, single-chip microcomputer U2, switching signal circuit, crystal oscillator and loop filter.Wherein, the switching signal circuit comprises the 11 resistance R the 11, the 12 resistance R the 12, the 16 resistance R the 16, the 17 resistance R 17, first K switch 1 and second switch K2: an end ground connection of first K switch 1, and the other end links to each other with the two-way I/O mouth of single-chip microcomputer U2 by the 16 resistance R 16; The end ground connection of second switch K2, the other end links to each other with another two-way I/O mouth of single-chip microcomputer U2 by the 17 resistance R 17.Above-mentioned two I/O mouths link to each other with power supply with the 12 resistance R 12 by the 11 resistance R 11 respectively.The switching signal circuit, is finally controlled apparatus of the present invention and can be launched four frequencies to four kinds of different level signals of single-chip microcomputer U2 input by switching the state of two switches.
Single-chip microcomputer U2 handles four kinds of signals of described input, and output serial clock signal, data-signal and enable signal are to phase-locked loop chip U1.Phase-locked loop chip U1 adopts two-wire system, its output to crystal oscillator Y1, single-chip microcomputer U2, Voltage-Controlled oscillation circuit 3 is handled, the output variable voltage signal is to loop filter, loop filter carries out outputing to after the filtering input of Voltage-Controlled oscillation circuit 3 to above-mentioned variable voltage signal, constitute a feedback control loop, make that oscillating circuit work is more stable.Physical circuit connects: the radio-frequency (RF) signal input end of phase-locked loop chip (RF) is electrically connected with the output of Voltage-Controlled oscillation circuit 3 by a capacitance-resistance buffer circuit, its crystal oscillator input (XTAL) links to each other with the end of crystal oscillator Y1, its Enable Pin (CE), serial clock signal input (SCL), data-signal input (SDA) respectively with single-chip microcomputer U2 port (TOCK1, GPO, GP1) link to each other, its adjustment voltage output end (VTUNE) links to each other with the input of loop filter and links to each other with power supply by the 8th resistance R 8, and its charge inside pulse output end (CP) links to each other with an end of the polyphone branch road that the tenth capacitor C 10 and the 12 capacitor C 12 are formed; The other end of described polyphone branch road links to each other with the input of loop filter.The other end of crystal oscillator Y1 is by the 13 capacitor C 13 ground connection.Also comprise the 6th resistance R 6, be connected in the 12 capacitor C 12 two ends in parallel.Described loop filter comprises the 7th resistance R 7, the 9th resistance R 9, the tenth resistance R 10 and the 11 capacitor C 11; One end of the 7th resistance R 7 is electrically connected with phase-locked loop chip U1 as the input of loop filter, and the other end links to each other with an end of the polyphone branch road that the 11 capacitor C 11 is formed with an end, the tenth resistance R 10 of the 9th resistance R 9; The other end ground connection of described polyphone branch road; The other end of the 9th resistance R 9 links to each other with the input of described Voltage-Controlled oscillation circuit as the output of loop filter.
The operation principle of circuit of the present invention is: audio signal is carried out filtering by filter circuit 11 earlier, modulate separately to improve tonequality through 1 pair of voice signal of audio frequency primary modulation circuit, and the isolation of raising audio signal and vision signal, the wave band obstructed with vision signal arrived in the frequency modulation(FM) of audio signal, be input to Voltage-Controlled oscillation circuit 3 again.To incoming video signal, carry out preemphasis by video preemphasis circuit 2 earlier, the signal medium-high frequency is partly improved, and low frequency part is constant, to reduce the distortion in subsequent conditioning circuit, is input to Voltage-Controlled oscillation circuit 3 again.And phase-locked loop circuit 6 is sampled to the output of Voltage-Controlled oscillation circuit 3 by a capacitance-resistance buffer circuit, compare with the frequency control signal of single-chip microcomputer U2 output again after comparing with the frequency signal of crystal oscillator Y1 output, final output one phase-error pulse signal, again through changing a direct current voltage after the resistance capacitance integral processing into to the varicap of control signal in the Voltage-Controlled oscillation circuit 3, thereby this change in voltage can change the operating frequency that the capacitance of varicap changes bikini oscillator, reaches the purpose of control tranmitting frequency.Above-mentioned three kinds of signals carry out frequency modulation frequency modulation after the input stack of Voltage-Controlled oscillation circuit 3, all signals are modulated to tranmitting frequency, amplify the back by transmission antennas transmit through amplifying circuit 4 at last.
Claims (11)
1, a kind of audio-video wireless emitting device comprises audio frequency primary modulation circuit, video preemphasis circuit, Voltage-Controlled oscillation circuit and amplifying circuit, it is characterized in that: also comprise phase-locked loop circuit; Described phase-locked loop circuit comprises phase-locked loop chip (U1), single-chip microcomputer (U2), switching signal circuit, crystal oscillator and loop filter;
Described switching signal circuit is by switching the state of two switches, to four kinds of different signals of single-chip microcomputer (U2) input;
Described single-chip microcomputer (U2) is handled four kinds of signals of described input, and output serial clock signal, data-signal and enable signal are to phase-locked loop chip (U1);
Described phase-locked loop chip adopts two-wire system, and its output to crystal oscillator, single-chip microcomputer (U2), voltage controlled oscillator is handled, and the output variable voltage signal is to loop filter;
Described loop filter carries out outputing to after the filtering input of Voltage-Controlled oscillation circuit to described variable voltage signal.
2, audio-video wireless emitting device according to claim 1 is characterized in that: described switching signal circuit comprises the 11 resistance (R11), the 12 resistance (R12), the 16 resistance (R16), the 17 resistance (R17), first switch (K1) and second switch (K2); One end ground connection of first switch (K1), the other end links to each other with the two-way I/O mouth of single-chip microcomputer (U2) by the 16 resistance (R16); One end ground connection of second switch (K2), the other end links to each other with another two-way I/O mouth of single-chip microcomputer (U2) by the 17 resistance (R17); Above-mentioned two I/O mouths link to each other with power supply with the 12 resistance (R12) by the 11 resistance (R11) respectively.
3, audio-video wireless emitting device according to claim 1, it is characterized in that: the radio-frequency (RF) signal input end of described phase-locked loop chip is electrically connected with the output of described Voltage-Controlled oscillation circuit, its crystal oscillator input links to each other with an end of described crystal oscillator, its Enable Pin, the serial clock signal input, the data-signal input links to each other with single-chip microcomputer (U2) port respectively, it is adjusted, and voltage output end links to each other with the input of loop filter and pass through the 8th resistance (R8) links to each other with power supply, and its charge inside pulse output end links to each other with an end of the polyphone branch road that the tenth electric capacity (C10) and the 12 electric capacity (C12) are formed; The other end of described polyphone branch road links to each other with the input of loop filter; The other end of described crystal oscillator is by the 13 electric capacity (C13) ground connection; Also comprise the 6th resistance (R6), be connected in the 12 electric capacity (C12) two ends in parallel.
4, according to claim 1 or 3 described audio-video wireless emitting devices, it is characterized in that: described loop filter comprises the 7th resistance (R7), the 9th resistance (R9), the tenth resistance (R10) and the 11 electric capacity (C11); One end of the 7th resistance (R7) is electrically connected with phase-locked loop chip (U1) as the input of loop filter, and the other end links to each other with an end of the polyphone branch road that the 11 electric capacity (C11) is formed with an end, the tenth resistance (R10) of the 9th resistance (R9); The other end ground connection of described polyphone branch road; The other end of the 9th resistance (R9) links to each other with the input of described Voltage-Controlled oscillation circuit as the output of loop filter.
5, audio-video wireless emitting device according to claim 1, it is characterized in that: described Voltage-Controlled oscillation circuit mainly comprises variable capacitance diode (VD1), second inductance (L2), the 24 electric capacity (C24), the 3rd electric capacity (C3) and second triode (Q2); The plus earth of described variable capacitance diode (VD1), its negative electrode is electrically connected with the output of described audio frequency primary modulation circuit, video preemphasis circuit and phase-locked loop circuit as the input of Voltage-Controlled oscillation circuit, and the polyphone branch road of forming by second inductance (L2) and the 24 electric capacity (C24) links to each other with the base stage of second triode (Q2); The collector electrode of second triode (Q2) is electrically connected with power supply, and is electrically connected with amplifying circuit as the output of Voltage-Controlled oscillation circuit, and its emitter is by the 21 resistance (R21) ground connection; The 3rd electric capacity (C3) is connected across between the collector electrode and emitter of second triode (Q2); One end of the 30 resistance (R30) links to each other with power supply, and the other end links to each other with the 19 resistance (R19) end, first microstrip line, one end and the 15 electric capacity (C15) end; The 19 resistance (R19) other end links to each other with the base stage of second triode (Q2); The other end of first microstrip line links to each other with the collector electrode of second triode (Q2); The other end ground connection of the 15 electric capacity (C15); The 25 electric capacity (C25) cross-over connection is between the base stage and emitter of second triode (Q2); The 4th electric capacity (C4) end links to each other other end ground connection with the emitter of second triode (Q2).
6, audio-video wireless emitting device according to claim 1 is characterized in that: described audio frequency primary modulation circuit mainly comprises second electric capacity (C2), the 6th electric capacity (C6), first inductance (L1) and first triode (Q1); The base stage of described first triode (Q1) is as the input input audio signal of audio frequency primary modulation circuit, and its collector electrode is electrically connected with power supply, and its emitter is electrically connected with described Voltage-Controlled oscillation circuit as audio frequency primary modulation circuit; One end of the 6th electric capacity (C6) links to each other with the base stage of first triode (Q1), and the other end links to each other with first inductance (L1) end; The other end ground connection of first inductance (L1); Second electric capacity (C2) cross-over connection is between the collector electrode and emitter of first triode (Q1); One end of first resistance (R1) links to each other with power supply, and the other end links to each other with an end of second resistance (R2), first triode (Q1) and second electric capacity (C2); The other end of second resistance (R2) links to each other with the base stage of first triode (Q1); The other end of second electric capacity (C2) links to each other with the emitter of first triode (Q1); The end that (WC1) held in first power transformation links to each other its other end ground connection with the tie point of the 6th electric capacity (C6) with first inductance (L1); The 3rd resistance (R3) links to each other other end ground connection with an end of the parallel branch that the 5th electric capacity (C5) is formed with the emitter of first triode (Q1).
7, audio-video wireless emitting device according to claim 1 is characterized in that: described video preemphasis circuit comprises the 25 resistance (R25), the 28 resistance (R28), the 29 resistance (R29) and the 17 electric capacity (C17); One end of the parallel branch that the 17 electric capacity (C17) and the 29 resistance (R29) are formed is as the input of video preemphasis circuit, incoming video signal, and link to each other with an end of the 28 resistance (R28), its other end is electrically connected with described Voltage-Controlled oscillation circuit as the output of video preemphasis circuit, and links to each other with an end of the 25 resistance (R25); The other end ground connection of the 28 resistance (R28); The other end ground connection of the 25 resistance (R25).
8, audio-video wireless emitting device according to claim 1 is characterized in that: described amplifying circuit comprises the 13 resistance (R13), the 15 resistance (R15), second microstrip line and the 3rd triode (Q3); The base stage of described the 3rd triode (Q3) is electrically connected with described Voltage-Controlled oscillation circuit as the input of amplifying circuit, its grounded emitter, the polyphone branch road that its collector electrode is formed by the 13 resistance (R13) and first microstrip line links to each other with power supply, and is electrically connected with transmitting antenna as the output of amplifying circuit; One end of the 15 resistance (R15) links to each other with the base stage of the 3rd triode (Q3), other end ground connection.
9, audio-video wireless emitting device according to claim 1 is characterized in that also comprising filter circuit: comprise the 4th resistance (R4) and the 8th electric capacity (C8); One end of the 4th resistance (R4) links to each other with an end of audio input end and the 8th electric capacity (C8), and the other end links to each other with the input of audio frequency primary modulation circuit; The other end ground connection of the 8th electric capacity (C8).
10, audio-video wireless emitting device according to claim 1, it is characterized in that: also comprise the polyphone branch road that resistance and electric capacity are formed, as the isolation coupling circuit, be connected between audio frequency primary modulation circuit and the Voltage-Controlled oscillation circuit, and between video preemphasis circuit and the Voltage-Controlled oscillation circuit.
11, audio-video wireless emitting device according to claim 1 is characterized in that also comprising a biasing circuit: comprise the 20 resistance (R20), the 23 resistance (R23), the 27 resistance (R27), the 9th electric capacity (C9) and the 19 electric capacity (C19); The polyphone branch road that the 27 resistance (R27) and the 23 resistance (R23) are formed an end link to each other with power supply, the other end links to each other with the input of Voltage-Controlled oscillation circuit; The 9th electric capacity (C9) end links to each other other end ground connection with an end of the parallel branch that the 20 resistance (R20) is formed with the tie point of the 27 resistance (R27) and the 23 resistance (R23); One end of the 19 electric capacity (C19) links to each other with power supply, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101019330A CN100479501C (en) | 2005-12-02 | 2005-12-02 | Audio and video wireless transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101019330A CN100479501C (en) | 2005-12-02 | 2005-12-02 | Audio and video wireless transmitting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1791186A true CN1791186A (en) | 2006-06-21 |
| CN100479501C CN100479501C (en) | 2009-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101019330A Expired - Fee Related CN100479501C (en) | 2005-12-02 | 2005-12-02 | Audio and video wireless transmitting device |
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| Country | Link |
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| CN (1) | CN100479501C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098460A (en) * | 2009-12-11 | 2011-06-15 | 深圳市华视联发电子科技有限公司 | Integrated ultrahigh frequency audio and video transmitter and transmission method thereof |
| CN104063916A (en) * | 2013-03-19 | 2014-09-24 | 成都凯智科技有限公司 | Wireless signal transmitter for video snapshot and identification system of parking lot |
| CN108597201A (en) * | 2018-02-12 | 2018-09-28 | 西安财经学院 | A kind of man-machine supplementary AC equipment of English Translation |
| CN113078954A (en) * | 2021-03-19 | 2021-07-06 | 苏州微光电子融合技术研究院有限公司 | Driving circuit based on phase shift pre-emphasis |
| CN114598320A (en) * | 2022-03-31 | 2022-06-07 | 上海韬润半导体有限公司 | Loop filter for phase-locked loop and phase-locked loop |
-
2005
- 2005-12-02 CN CNB2005101019330A patent/CN100479501C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098460A (en) * | 2009-12-11 | 2011-06-15 | 深圳市华视联发电子科技有限公司 | Integrated ultrahigh frequency audio and video transmitter and transmission method thereof |
| CN102098460B (en) * | 2009-12-11 | 2013-10-30 | 深圳市华视联发电子科技有限公司 | Integrated ultrahigh frequency audio and video transmitter and transmission method thereof |
| CN104063916A (en) * | 2013-03-19 | 2014-09-24 | 成都凯智科技有限公司 | Wireless signal transmitter for video snapshot and identification system of parking lot |
| CN108597201A (en) * | 2018-02-12 | 2018-09-28 | 西安财经学院 | A kind of man-machine supplementary AC equipment of English Translation |
| CN113078954A (en) * | 2021-03-19 | 2021-07-06 | 苏州微光电子融合技术研究院有限公司 | Driving circuit based on phase shift pre-emphasis |
| CN114598320A (en) * | 2022-03-31 | 2022-06-07 | 上海韬润半导体有限公司 | Loop filter for phase-locked loop and phase-locked loop |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100479501C (en) | 2009-04-15 |
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