CN206650654U - A kind of digital phase shift synchronous detection frequency-discriminating circuit - Google Patents
A kind of digital phase shift synchronous detection frequency-discriminating circuit Download PDFInfo
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- CN206650654U CN206650654U CN201720231834.2U CN201720231834U CN206650654U CN 206650654 U CN206650654 U CN 206650654U CN 201720231834 U CN201720231834 U CN 201720231834U CN 206650654 U CN206650654 U CN 206650654U
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Abstract
A kind of digital phase shift synchronous detection frequency-discriminating circuit, frequency amplifying circuit, frequency locking circuit and balanced output circuit；The frequency amplifying circuit includes reception antenna E1, first high-frequency amplifier Q15, RC filter circuit, the first wave filter U10, the second high-frequency amplifier Q1, the second wave filter, local oscillation circuit, superimposed signal circuit and transformer T3；The output end of local oscillation circuit and the input of superimposed signal circuit connect, and the output signal of the superimposed signal circuit is coupled to frequency locking circuit by transformer T3；Frequency locking circuit includes the 3rd wave filter P5, signal amplification circuit, the 4th wave filter P4 and double off resonance frequency discriminator U16.The utility model microphone signal is sent in frequency-discriminating circuit by antenna, and the frequency amplifier in frequency-discriminating circuit is used for frequency modulation, and filter circuit is used for notch, so as to filtering clutter；By multiple signal amplification and filtering, finally realize that cleaner frequency of determining exports, make audio output more stable.
Description
Technical field
Field of audio is the utility model is related to, especially a kind of digital phase shift synchronous detection frequency-discriminating circuit.
Background technology
Microphone converts audio signals into data signal, and signal will first pass through frequency discriminator and carry out frequency modulation, finally restore out
Audio signal is exported.Kam-frequency circuit is that the frequency-modulated wave of constant amplitude first is converted into amplitude with instantaneous frequency by resonance circuit
The amplitude-modulation ＆ frequency-modulationwave of change, then amplitude detection is carried out with diode detector, to restore modulated signal.It is last due to signal
Detection or the change using high frequency amplitude, in order to avoid the modulated signal of parastic modulation interference detection, typically all input is reflected
The frequency-modulated wave of frequency device carries out amplitude limit and goes to disturb, and frequency discrimination is carried out again after making its constant amplitude.The frequency that existing frequency-discriminating circuit can export
Rate is low, and has signal interference.
The content of the invention
Technical problem to be solved in the utility model is to provide a kind of digital phase shift synchronous detection frequency-discriminating circuit, can be defeated
Go out the audio signal of high frequency, and the interference of signal is small.
In order to solve the above technical problems, the technical solution of the utility model is：A kind of digital phase shift synchronous detection frequency discrimination electricity
Road, frequency amplifying circuit, frequency locking circuit and balanced output circuit；The frequency amplifying circuit includes reception antenna E1, first high
Audio amplifier Q15, RC filter circuit, the first wave filter U10, the second high-frequency amplifier Q1, the second wave filter, local oscillation circuit, letter
Number supercircuit and transformer T3, reception antenna E1 pass sequentially through inductance L32 and electric capacity C213 and the first high-frequency amplifier Q15
Pin G2 connections, RC filter circuits are connected with the first high-frequency amplifier Q15 pin G1, the first high-frequency amplifier Q15 pin D
Pass sequentially through inductance L6, electric capacity C88 and inductance L9 to be connected with the first wave filter U10, the first high-frequency amplifier Q15 pin S connects
Ground, the pin G2 that the first wave filter U10 output end passes sequentially through after inductance L12, electric capacity C78 with the second high-frequency amplifier Q1 connect
Connect, the second high-frequency amplifier Q1 pin D is connected with the second wave filter P3 input, and the second wave filter P3 output end is successively
By being connected after electric capacity C114, electric capacity C211 with the input of superimposed signal circuit, the output end and signal of the local oscillation circuit
The input connection of supercircuit, the output signal of the superimposed signal circuit are coupled to frequency locking circuit by transformer T3；Institute
Stating frequency locking circuit includes the 3rd wave filter P5, signal amplification circuit, the 4th wave filter P4 and double off resonance frequency discriminator U16, the letter
Number amplifying circuit includes triode Q39, and power supply VCC passes sequentially through the colelctor electrode with triode Q39 after resistance R196, resistance R161
Connection, electric capacity C194 positive pole are connected between resistance R196 and resistance R161, electric capacity C194 negative pole ground connection, electric capacity C194's
Positive pole is connected by resistance R185 with triode Q39 base stage, triode Q39 grounded emitter, and the 3rd wave filter P5's is defeated
Enter end to be connected with transformer T3, the 3rd wave filter P5 output end is connected by electric capacity C200 with triode Q39 base stage, three poles
Pipe Q39 colelctor electrode is connected by electric capacity C197 with the 4th wave filter P4 input, the 4th wave filter P4 output end with it is double
Off resonance frequency discriminator U16 input pin connection, double off resonance frequency discriminator U16 output pin export audio by balanced output circuit
Signal.The utility model microphone signal is sent in frequency-discriminating circuit by antenna, is amplified by multiple signal and is filtered, finally
Realize that cleaner frequency of determining exports.
As an improvement, model SDF785, the model SB110MHz of second wave filter of first wave filter,
The frequency that 3rd wave filter and the 4th wave filter limit is 10.7MHz, the model LA1235 of double off resonance frequency discriminators.
As an improvement, the local oscillation circuit includes crystal oscillator Y1 and triode Q27, one end ground connection of crystal oscillator, the other end and three
Pole pipe Q27 base stage connection, triode Q27 colelctor electrode are connected with 5V power supplys, set between 5V power supplys and triode Q27 base stage
There is resistance R84, triode Q27 base stage passes sequentially through electric capacity C100 and electric capacity C101 ground connection, triode Q27 emitter stage and electricity
Feel L8 one end connection, the inductance L8 other end is grounded by electric capacity C107 and is grounded by resistance R144 respectively, triode
Emitter stage is connected after passing sequentially through electric capacity C75, electric capacity C92, electric capacity C91 with the input of superimposed signal circuit.
As an improvement, the superimposed signal circuit includes triode Q14 and electric capacity C83 parallel with one another, electric capacity C84, electricity
Hold C89, triode Q14 base stage is connected with the second wave filter P3 output end, and triode Q14 colelctor electrode passes through resistance R151
It is connected with a termination of transformer T3 primary coils, triode Q14 emitter stage is grounded by resistance R78 and electric capacity C76 respectively,
The positive pole of the electric capacity C83 is connected with power supply VCC, and electric capacity C89 positive pole is connected with another termination of transformer T3 primary coils,
Electric capacity C89 positive pole is grounded by resistance R79 and resistance R85, and electric capacity C91 output end is connected to resistance R78 by inductance L5
Between resistance R85.
Caused beneficial effect is the utility model compared with prior art：
The utility model microphone signal is sent in frequency-discriminating circuit by antenna, is amplified by multiple signal and is filtered,
Finally realize that cleaner frequency of determining exports, make audio output more stable.
Brief description of the drawings
Fig. 1 is frequency amplifying circuit schematic diagram.
Fig. 2 is frequency locking circuit theory diagrams.
Fig. 3 is balanced output circuit schematic diagram.
Embodiment
With reference to Figure of description, the utility model is described in further detail.
As shown in Figures 1 to 3, a kind of digital phase shift synchronous detection frequency-discriminating circuit, frequency amplifying circuit, frequency locking circuit and balance
Output circuit.Signal is converted into the clean high-frequency signal of comparison after overfrequency amplifying circuit and frequency locking circuit, and the signal is last
Audio signal is converted into by balanced output circuit to export.Balanced output circuit is prior art, no longer to it in the present embodiment
It is described in detail.
As shown in figure 1, the frequency amplifying circuit includes reception antenna E1, first high-frequency amplifier Q15, RC filtered electrical
Road, the first wave filter U10, the second high-frequency amplifier Q1, the second wave filter, local oscillation circuit, superimposed signal circuit and transformer T3.
Reception antenna E1 passes sequentially through inductance L32 and electric capacity C213 and is connected with the first high-frequency amplifier Q15 pin G2, RC filter circuits
It is connected with the first high-frequency amplifier Q15 pin G1, the first high-frequency amplifier Q15 pin D passes sequentially through inductance L6, electric capacity
C88 and inductance L9 is connected with the first wave filter U10, and the first high-frequency amplifier Q15 pin S ground connection, the first wave filter U10's is defeated
Go out after end passes sequentially through inductance L12, electric capacity C78 and be connected with the second high-frequency amplifier Q1 pin G2, the second high-frequency amplifier Q1
Pin D be connected with the second wave filter P3 input, the second wave filter P3 output end passes sequentially through electric capacity C114, electric capacity
It is connected after C211 with the input of superimposed signal circuit.The output end of the local oscillation circuit and the input of superimposed signal circuit connect
Connect, the output signal of the superimposed signal circuit is coupled to frequency locking circuit by transformer T3.
As shown in figure 1, the RC filter circuits include electric capacity C218 parallel with one another, electric capacity C219, electric capacity C85, electric capacity
C134 and electric capacity C212, resistance R6 is provided between electric capacity C218 and electric capacity C219, resistance is provided between electric capacity C85 and electric capacity C134
R86, electric capacity C212 are in parallel with resistance R2；Power supply VCC is connected with electric capacity C218 positive pole.
As shown in figure 1, the local oscillation circuit includes crystal oscillator Y1 and triode Q27, one end ground connection of crystal oscillator, the other end and three
Pole pipe Q27 base stage connection, triode Q27 colelctor electrode are connected with 5V power supplys, set between 5V power supplys and triode Q27 base stage
There is resistance R84, triode Q27 base stage passes sequentially through electric capacity C100 and electric capacity C101 ground connection, triode Q27 emitter stage and electricity
Feel L8 one end connection, the inductance L8 other end is grounded by electric capacity C107 and is grounded by resistance R144 respectively, triode
Emitter stage is connected after passing sequentially through electric capacity C75, electric capacity C92, electric capacity C91 with the input of superimposed signal circuit.
As shown in figure 1, the superimposed signal circuit includes triode Q14 and electric capacity C83 parallel with one another, electric capacity C84, electricity
Hold C89, triode Q14 base stage is connected with the second wave filter P3 output end, and triode Q14 colelctor electrode passes through resistance R151
It is connected with a termination of transformer T3 primary coils, triode Q14 emitter stage is grounded by resistance R78 and electric capacity C76 respectively,
The positive pole of the electric capacity C83 is connected with power supply VCC, and electric capacity C89 positive pole is connected with another termination of transformer T3 primary coils,
Electric capacity C89 positive pole is grounded by resistance R79 and resistance R85, and electric capacity C91 output end is connected to resistance R78 by inductance L5
Between resistance R85.
As shown in Fig. 2 the frequency locking circuit includes the 3rd wave filter P5, signal amplification circuit, the 4th wave filter P4 and double
Off resonance frequency discriminator U16, the signal amplification circuit include triode Q39, and power supply VCC passes sequentially through resistance R196, resistance R161
The colelctor electrode with triode Q39 is connected afterwards, and electric capacity C194 positive pole is connected between resistance R196 and resistance R161, electric capacity C194
Negative pole ground connection, electric capacity C194 positive pole is connected by resistance R185 with triode Q39 base stage, triode Q39 emitter stage
Ground connection, the 3rd wave filter P5 input are connected with transformer T3, and the 3rd wave filter P5 output end passes through electric capacity C200 and three
Pole pipe Q39 base stage connection, triode Q39 colelctor electrode are connected by electric capacity C197 with the 4th wave filter P4 input, the
Four wave filter P4 output end is connected with double off resonance frequency discriminator U16 input pin, and double off resonance frequency discriminator U16 output pin leads to
Overbalance output circuit exports audio signal.
The model SDF785 of first wave filter, the model SB110MHz of second wave filter, the described 3rd
The frequency that wave filter and the 4th wave filter limit is 10.7MHz, the model LA1235 of double off resonance frequency discriminators.
The utility model microphone signal is sent in frequency-discriminating circuit by antenna, and the frequency amplifier in frequency-discriminating circuit is used for
Frequency modulation, filter circuit are used for notch, so as to filtering clutter；By multiple signal amplification and filtering, finally realize cleaner
Determine frequency output, make audio output more stable.
Claims (5)
- A kind of 1. digital phase shift synchronous detection frequency-discriminating circuit, it is characterised in that：Frequency amplifying circuit, frequency locking circuit and Differential Output Circuit；The frequency amplifying circuit includes reception antenna E1, first high-frequency amplifier Q15, RC filter circuit, the first wave filter U10, the second high-frequency amplifier Q1, the second wave filter, local oscillation circuit, superimposed signal circuit and transformer T3, reception antenna E1 according to Secondary to be connected by inductance L32 and electric capacity C213 with the first high-frequency amplifier Q15 pin G2, RC filter circuits are put with the first high frequency Big device Q15 pin G1 connections, the first high-frequency amplifier Q15 pin D pass sequentially through inductance L6, electric capacity C88 and inductance L9 and First wave filter U10 connections, the first high-frequency amplifier Q15 pin S ground connection, the first wave filter U10 output end pass sequentially through Pin G2 after inductance L12, electric capacity C78 with the second high-frequency amplifier Q1 is connected, the second high-frequency amplifier Q1 pin D and second Wave filter P3 input connection, the second wave filter P3 output end are folded after passing sequentially through electric capacity C114, electric capacity C211 with signal The input connection on road is powered up, the output end of the local oscillation circuit and the input of superimposed signal circuit are connected, and the signal is folded The output signal on power-up road is coupled to frequency locking circuit by transformer T3；The frequency locking circuit includes the 3rd wave filter P5, signal Amplifying circuit, the 4th wave filter P4 and double off resonance frequency discriminator U16, the signal amplification circuit include triode Q39, power supply VCC It is connected after passing sequentially through resistance R196, resistance R161 with triode Q39 colelctor electrode, electric capacity C194 positive pole is connected to resistance Between R196 and resistance R161, electric capacity C194 negative pole ground connection, electric capacity C194 positive pole passes through resistance R185's and triode Q39 Base stage is connected, and triode Q39 grounded emitter, the 3rd wave filter P5 input is connected with transformer T3, the 3rd wave filter P5 output end is connected by electric capacity C200 with triode Q39 base stage, and triode Q39 colelctor electrode passes through electric capacity C197 and Four wave filter P4 input connection, the 4th wave filter P4 output end is connected with double off resonance frequency discriminator U16 input pin, double Off resonance frequency discriminator U16 output pin passes through balanced output circuit exports audio signal.
- A kind of 2. digital phase shift synchronous detection frequency-discriminating circuit according to claim 1, it is characterised in that：The RC filtered electricals Road includes electric capacity C218 parallel with one another, electric capacity C219, electric capacity C85, electric capacity C134 and electric capacity C212, electric capacity C218 and electric capacity Resistance R6 is provided between C219, resistance R86 is provided between electric capacity C85 and electric capacity C134, electric capacity C212 is in parallel with resistance R2；Power supply VCC is connected with electric capacity C218 positive pole.
- A kind of 3. digital phase shift synchronous detection frequency-discriminating circuit according to claim 1, it is characterised in that：First filtering The model SDF785 of device, the model SB110MHz of second wave filter, the 3rd wave filter and the 4th the wave filter limit Fixed frequency is 10.7MHz, the model LA1235 of double off resonance frequency discriminators.
- A kind of 4. digital phase shift synchronous detection frequency-discriminating circuit according to claim 1, it is characterised in that：The local oscillation circuit Including crystal oscillator Y1 and triode Q27, one end of crystal oscillator is grounded, and the other end is connected with triode Q27 base stage, triode Q27's Colelctor electrode is connected with 5V power supplys, resistance R84 is provided between 5V power supplys and triode Q27 base stage, triode Q27 base stage is successively It is grounded by electric capacity C100 and electric capacity C101, triode Q27 emitter stage is connected with inductance L8 one end, the inductance L8 other end Be grounded by electric capacity C107 and be grounded by resistance R144 respectively, the emitter stage of triode pass sequentially through electric capacity C75, electric capacity C92, It is connected after electric capacity C91 with the input of superimposed signal circuit.
- A kind of 5. digital phase shift synchronous detection frequency-discriminating circuit according to claim 1, it is characterised in that：The Signal averaging Circuit includes triode Q14 and electric capacity C83 parallel with one another, electric capacity C84, electric capacity C89, triode Q14 base stage and the second filter Ripple device P3 output end connection, triode Q14 colelctor electrode are connected by a termination of resistance R151 and transformer T3 primary coils Connect, triode Q14 emitter stage is grounded by resistance R78 and electric capacity C76 respectively, and positive pole and the power supply VCC of the electric capacity C83 connect Connect, electric capacity C89 positive pole is connected with another termination of transformer T3 primary coils, and electric capacity C89 positive pole passes through resistance R79 and electricity R85 ground connection is hindered, electric capacity C91 output end is connected between resistance R78 and resistance R85 by inductance L5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720231834.2U CN206650654U (en) | 2017-03-10 | 2017-03-10 | A kind of digital phase shift synchronous detection frequency-discriminating circuit |
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| CN201720231834.2U CN206650654U (en) | 2017-03-10 | 2017-03-10 | A kind of digital phase shift synchronous detection frequency-discriminating circuit |
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| CN206650654U true CN206650654U (en) | 2017-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112422466A (en) * | 2020-12-04 | 2021-02-26 | 国网河南省电力公司襄城县供电公司 | Radiation detection device of transformer substation |
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2017
- 2017-03-10 CN CN201720231834.2U patent/CN206650654U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112422466A (en) * | 2020-12-04 | 2021-02-26 | 国网河南省电力公司襄城县供电公司 | Radiation detection device of transformer substation |
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20180607 Address after: 510800 the 10 set (Part 10) of bang Sheng Road No. 2, Huadu District, Guangdong province.:Office building 101-105 room) Patentee after: Guangzhou second dimension Electronic Technology Co., Ltd. Address before: 510800 Guangzhou, Guangdong province Huadu District, Xinhua Street, Jinghu Avenue, No. 10, 1 Patentee before: GUANGZHOU WANCHANG SOUND CO., LTD. |