CN2133992Y - Fm subcarrier receiver - Google Patents
Fm subcarrier receiver Download PDFInfo
- Publication number
- CN2133992Y CN2133992Y CN 92221252 CN92221252U CN2133992Y CN 2133992 Y CN2133992 Y CN 2133992Y CN 92221252 CN92221252 CN 92221252 CN 92221252 U CN92221252 U CN 92221252U CN 2133992 Y CN2133992 Y CN 2133992Y
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- frequency
- selecting
- signal
- discrimination
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- Expired - Fee Related
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- Superheterodyne Receivers (AREA)
Abstract
The utility model relates to an FM subsidiary carrier receiver, comprising an antenna 1, a first frequency selection 2, a high amplifier 3, a crystal double-frequency oscillation 5, a frequency mixing 4, a first middle amplifier 6 and a first frequency discrimination 7. The utility model is characterized in that the receiver also comprises a second frequency selection 8, a second frequency discrimination 9, a low amplifier 10 and an acoustics output 11. Since the utility model adopts crystal double-frequency oscillation, the utility model has the advantages of high stability, low cost and high selectivity. The utility model adds second frequency selection, and can reduce noise. The utility model is used for receiving various information of FM stations and FM subsidiary carrier stations.
Description
The utility model relates to a kind of receiving system of frequency-modulated wave.
In the prior art, the frequency-modulated wave receiver generally comprises antenna, frequency-selecting, high frequency amplification, mixing, intermediate frequency amplification, frequency discrimination, low putting and the loud speaker composition, and this receiver can only receive the FM radio station of different frequency, but can not receive the frequency modulated subcarrier radio station.
The purpose of this utility model is: a kind of receiver that receives the frequency modulated subcarrier radio station is provided.
The technical solution of the utility model is: the utility model comprises the antenna that is used to receive signal; Be used for the signal of antenna output is selected first frequency-selecting of frequency modulation signal; Being used for frequency modulation signal to first frequency-selecting output carries out the height that high frequency amplifies and puts; A crystal double frequency vibration that produces high-frequency oscillation signal; Frequency modulation signal and the oscillator signal mixing of crystal double frequency vibration output and a mixing that produces the difference frequency signal of height being put output; Intermediate frequency signal to mixing output carry out that intermediate frequency amplifies first in put; Be used for first frequency discrimination of putting the signal frequency discrimination of output to first; This receiver also comprises second frequency-selecting of paying carrier signal of selecting the output of first frequency discrimination; A subcarrier signal of second frequency-selecting output is carried out second frequency discrimination of frequency discrimination; Audio electrical signal to the output of second frequency discrimination carries out low the putting that low frequency amplifies; Be used for to hang down the sound equipment output that the audio electrical signal of putting output is converted to sound.
The utility model compared with prior art has following advantage:
(1). adopted the crystal double frequency vibration, the stability of frequency is high, the selectivity height, cost is low.
(2). increased by second frequency-selecting, can reduce noise.
The utility model will be further described below in conjunction with drawings and Examples:
Accompanying drawing 1 is a circuit block diagram of the present utility model;
Accompanying drawing 2 is circuit theory diagrams of the present utility model;
Accompanying drawing 3 is for forming the superhet circuit block diagram of second frequency-selecting and second frequency discrimination;
Accompanying drawing 4 is for forming the direct amplifier system circuit block diagram of second frequency-selecting and second frequency discrimination;
Referring to accompanying drawing 1 block diagram.After the frequency modulation signal enters antenna 1, put 3 by first frequency-selecting 2, height and enter mixing 4, produce 10.7MC intermediate frequency signal (claiming first intermediate frequency) with crystal double frequency 5 difference frequencies that vibrate, amplify by putting 6 in first then, first frequency discrimination 7 carries out frequency discrimination and obtains FM audio signal and FM pair (frequency modulated subcarrier) signal.Because FM frequency band broad generally can add two subcarriers, i.e. FM pair 1, FM pair 2.Like this, obtain FM audio signal, FM pair 1, the secondary 2 several signals of FM behind first frequency discrimination, first frequency discrimination, 7 resulting signals send into second frequency-selecting 8 again and second frequency discrimination 9 is handled.
In the accompanying drawing 2, all integrated pins number represent with single quotation marks that all for example: the 3rd pin of this integrated package is represented in ' 3 ' in the integrated package 16.In the accompanying drawing 2,12 is antenna, electric capacity 13, electric capacity 14, inductance 15 are as first frequency-selecting, height is put, mixing is finished by integrated package 16, its model is TA7358AP, triode 17 amplifies as the signal first order of putting in first, and integrated package 18 amplifies as the second level of putting in first, and its model is KA2241.Low putting by integrated package 41 finished, and its model is 2822.Sound equipment output is finished by loud speaker 42.
Referring to the crystal double frequency oscillating part of accompanying drawing 2, crystal 27 one end ground connection, the base stage of another termination triode 30; Biasing resistor 28,29 is connected across between power supply and the ground, and the contact of two resistance is connected on the base stage of triode 30; After direct current negative feedback resistor 35 and electric capacity 34 are in parallel, are in series with electric capacity 32, inductance 33 in parallel again, and are connected across between the emitter and ground of triode 30; Be connected across between the collector electrode of power supply and triode 30 after inductance 31 and electric capacity 36 are in parallel; Going back cross-over connection between the collector electrode of triode 30 and the ground has electric capacity 37, and the contact of electric capacity 37 and electric capacity 36 is as the output of crystal double frequency vibration 5.Go back the high frequency electric source filter circuit that cross-over connection has resistance 39, electric capacity 38 to be composed in series between power supply and the ground, the contact of resistance 39 and electric capacity 38 is as the power input of crystal double frequency vibration 5.In accordance with regulations, the receive frequency of frequency modulated subcarrier receiver must lock, and promptly receiver can only receive the subcarrier program that a FM radio station is broadcast, so the local oscillations of receiver also must be fixing.In the accompanying drawing 2, resistance 39, electric capacity 38 are the high frequency electric source filter circuit.Resistance 28, resistance 29 are as the biasing resistor of triode 30.Resistance 35 is the direct current negative feedback, and inductance 30, electric capacity 36, electric capacity 37 are the frequency multiplication load, and 27 is crystal, and electric capacity 32, inductance 33 promote for amplifying, and 34 for exchanging shunt capacitance.
A kind of form of seeing accompanying drawing 3, the second frequency-selectings 8 and second frequency discrimination 9 is the superhet circuit; Described superhet circuit comprises signal that receives 7 outputs of first frequency discrimination and the frequency-selecting 50 of selecting two subcarrier signals; Two-way oscillation source vibration 54 and vibration 55, the output of its oscillator signal is controlled by diverter switch; A subcarrier and vibration 54 or vibrate the oscillator signal mixing of 55 outputs and the mixing 51 that produces a difference frequency signal with frequency-selecting 50 outputs; Intermediate frequency signal to mixing 51 output carry out that intermediate frequency amplifies in put 52; Be used for centering and put the frequency discrimination 53 that the signal of 52 outputs is handled.Physical circuit is seen the signal of accompanying drawing 2, the first frequency discriminations 7 by frequency-selecting 50 loops, and this frequency-selective circuit is actual to be band pass filter, elimination FM audio signal, and FM pair 1, FM pair 2 pass through smoothly, enters mixing 51 circuit.Go out 465KC(or 455KC with the local oscillations difference) intermediate frequency signal (claiming second intermediate frequency), amplify then, frequency discrimination, demodulate the audio signal (by diverter switch control) of FM secondary 1 or FM pair 2, deliver to low amplification at last, promote the loud speaker sounding.See accompanying drawing 2 corresponding to the circuit theory diagrams of accompanying drawing 3, electric capacity 19, inductance 20, electric capacity 21, inductance 22 are formed band pass filter, the logical scope of band is about 55MC～100MC, 23,24 is two ceramic resonator, 25 is the 465KC ceramic filter, 26 are the phase shift coil, and the model of integrated package 40 is MC3357.
The another kind of form of seeing accompanying drawing 4, the second frequency-selectings 8 and second frequency discrimination 9 is the direct amplifier system frequency-discriminating circuit; Described direct amplifier system frequency-discriminating circuit comprises the frequency-selecting 56 that is used for the first subcarrier frequency-selecting; Be used for frequency-selecting 57 to the second subcarrier frequency-selecting; Described frequency-selecting 56, frequency-selecting 57 are elected a subcarrier signal in the signal of first frequency discrimination, 7 outputs by diverter switch; Be used for the subcarrier of frequency-selecting 56 or frequency-selecting 57 outputs is carried out the amplification 58 that signal amplifies; Be used for amplifying the frequency discrimination 59 that 58 subcarrier signals of exporting are handled.Physical circuit is seen Fig. 5, FM audio signal, FM pair 1, the FM pair 2 of the output of first frequency discrimination enter frequency-selective circuit, frequency-selective circuit is selected FM secondary 1 or FM pair 2 separately, elimination FM audio signal (by diverter switch control), then with FM secondary 1 or FM pair 2 is amplified, frequency discrimination, demodulate the audio signal of FM secondary 1 or FM pair 2, send into low frequency and amplify, promote the loud speaker sounding.The number of frequencies of FM pair (in the bandwidth must not above two) is selected by the radio station, and the frequency of FM pair is generally 67KC and 92KC.The circuit theory diagrams of direct amplifier system frequency-discriminating circuit are seen accompanying drawing 5, and electric capacity 60, inductance 61, electric capacity 62, inductance 63, electric capacity 64, inductance 65 are formed the LC frequency-selective circuit, are used to select FM pair 1; Electric capacity 66, inductance 67, electric capacity 68, inductance 69, electric capacity 70, inductance 71 are formed another road LC frequency-selective circuit, are used to select FM pair 2, control some frequency-selector work by diverter switch.Integrated package 72 is as amplifying and frequency discriminations, and it is that the integrated package of TDA7010T directly amplifies, frequency discrimination that FM secondary 1 or FM pair 2 enter this model, obtains the audio signal of FM secondary 1 or FM pair 2, delivers to low discharging circuit.
Claims (5)
1, a kind of frequency modulated subcarrier receiver comprises the antenna 1 that is used to receive signal; Be used for the signal of antenna 1 output is selected first frequency-selecting 2 of frequency modulation signal; Being used for frequency modulation signal to first frequency-selecting 2 output carries out the height that high frequency amplifies and puts 3; A crystal double frequency vibration 5 that produces high-frequency oscillation signal; Frequency modulation signal and the oscillator signal mixing of crystal double frequency vibration 5 outputs and a mixing 4 that produces the difference frequency signal of height being put 3 outputs; Intermediate frequency signal to mixing 4 output carry out that intermediate frequency amplifies first in put 6; Be used for putting first frequency discrimination 7 of signal frequency discriminations of 6 outputs to first; It is characterized in that: this receiver also comprises second frequency-selecting 8 of paying carrier signal of selecting 7 outputs of first frequency discrimination; A subcarrier signal of second frequency-selecting, 8 outputs is carried out second frequency discrimination 9 of frequency discrimination; Audio electrical signal to 9 outputs of second frequency discrimination carries out the low of low frequency amplification puts 10; Be used for to hang down the audio electrical signals of putting 10 outputs and be converted to the sound equipment output 11 of sound.
2, frequency modulated subcarrier receiver according to claim 1 is characterized in that: crystal double frequency vibration 5 is crystal 27 one end ground connection, the base stage of another termination triode 30; Biasing resistor 28,29 is connected across between power supply and the ground, and the contact of two resistance is connected on the base stage of triode 30; After direct current negative feedback resistor 35 and electric capacity 34 are in parallel, are in series with electric capacity 32, inductance 33 in parallel again, and are connected across between the emitter and ground of triode 30; Be connected across between the collector electrode of power supply and triode 30 after inductance 31 and electric capacity 36 are in parallel; Going back cross-over connection between the collector electrode of triode 30 and the ground has electric capacity 37, and the contact of electric capacity 37 and electric capacity 36 is as the output of crystal double frequency vibration 5.
3, frequency modulated subcarrier receiver according to claim 2, it is characterized in that: go back the high frequency electric source filter circuit that cross-over connection has resistance 39, electric capacity 38 to be composed in series between power supply and the ground, the contact of resistance 39 and electric capacity 38 is as the power input of crystal double frequency vibration 5.
4, frequency modulated subcarrier receiver according to claim 1 is characterized in that: second frequency-selecting 8 and second frequency discrimination 9 comprise the frequency-selecting 50 of selection from two subcarrier signals of first frequency discrimination, 7 outputs; Two-way oscillation source vibration 54 and vibration 55, the output of its oscillator signal is controlled by diverter switch; Subcarrier with frequency-selecting 50 output is with vibration 54 or vibrate 55 through the oscillator signal mixing of diverter switch output and the mixing 51 that produces a difference frequency signal; Intermediate frequency signal to mixing 51 output carry out that intermediate frequency amplifies in put 52; Be used for centering and put the frequency discrimination 53 that the signal of 52 outputs is handled.
5, frequency modulated subcarrier receiver according to claim 1 is characterized in that: second frequency-selecting 8 and second frequency discrimination 9 comprise the frequency-selecting 56 that is used for the first subcarrier frequency-selecting; Be used for frequency-selecting 57 to the second subcarrier frequency-selecting; One in two subcarriers of first frequency discrimination, 7 outputs is selected in described frequency-selecting 56, frequency-selecting 57 by diverter switch; Be used for the subcarrier of frequency-selecting 56 or frequency-selecting 57 outputs is carried out the amplification 58 that signal amplifies; Be used for amplifying the frequency discrimination 59 that 58 subcarrier signals of exporting are handled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92221252 CN2133992Y (en) | 1992-08-31 | 1992-08-31 | Fm subcarrier receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92221252 CN2133992Y (en) | 1992-08-31 | 1992-08-31 | Fm subcarrier receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2133992Y true CN2133992Y (en) | 1993-05-19 |
Family
ID=33768086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92221252 Expired - Fee Related CN2133992Y (en) | 1992-08-31 | 1992-08-31 | Fm subcarrier receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2133992Y (en) |
-
1992
- 1992-08-31 CN CN 92221252 patent/CN2133992Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |