CN203457145U - Multifunctional voice frequency modulation and amplitude modulation signal demodulator - Google Patents
Multifunctional voice frequency modulation and amplitude modulation signal demodulator Download PDFInfo
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- CN203457145U CN203457145U CN201320597187.9U CN201320597187U CN203457145U CN 203457145 U CN203457145 U CN 203457145U CN 201320597187 U CN201320597187 U CN 201320597187U CN 203457145 U CN203457145 U CN 203457145U
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Abstract
The utility model discloses a multifunctional voice frequency modulation and amplitude modulation signal demodulator. The signal demodulator comprises a signal receiving module, a high-frequency small-signal tune amplifying module, a multi-channel frequency modulation demodulating module and a voice processing module. The signal receiving module comprises an antenna and an impedance matching network. The high-frequency small-signal tune amplifying module comprises a first stage amplifier, a first buffer, an anti-self-excitation resistance capacitor, a second stage amplifier, a second buffer and an anti-self-excitation network. The multi-channel frequency modulation demodulating module comprises a double-detuning LC slope frequency discriminator, a detector, a phase-shift network, a multiplication IC, a frequency modulation demodulation IC, a product-type synchronization detector, a first switch, a second switch, a third switch and a fourth switch. The voice processing module comprises a comparator, a horn and a voice receiving and determining lamp. The signal demodulator is applicable to teaching, scientific research and industrial communication, voice signals can be demodulated in a high fidelity manner, the signal to noise ratio is high, the cost is extremely low, the integrated level is relatively high, and distant signal transmission can be achieved.
Description
Technical field
The utility model relates to a kind of Wireless Telecom Equipment, relates in particular to a kind of multifunction speech frequency modulation, amplitude-modulated signal demodulator.
Background technology
The demodulation of frequency modulation, amplitude-modulated signal is a technology very ripe, application is very wide in the communications field, but has the shortcomings such as stability is not high, voice demodulation quality is not high, cost is high, specific aim is not strong in actual product is produced.
Utility model content
The purpose of this utility model: a kind of multifunction speech frequency modulation, amplitude-modulated signal demodulator are provided, can to centre frequency speech modulation or amplitude-modulated signal demodulation, and quality of speech signal is adjudicated.
To achieve these goals, the technical solution of the utility model is:
Multifunction speech frequency modulation, an amplitude-modulated signal demodulator, comprise signal receiving module, the tuning amplification module of high frequency small-signal, multichannel fm demodulation module and speech processing module; Described signal receiving module comprises antenna and impedance matching network, and described impedance matching network is connected with described antenna; The tuning amplification module of described high frequency small-signal comprises first order amplifier, the first buffer, anti-self-excitation resistance capacitance, second level amplifier, the second buffer and anti-Self-excitation Network; Described impedance matching network is connected with described first order amplifier, described first order amplifier, the first buffer, anti-self-excitation resistance capacitance, second level amplifier and the second buffer connect successively, and described anti-Self-excitation Network is connected with described first order amplifier, the first buffer, anti-self-excitation resistance capacitance, second level amplifier and the second buffer respectively; Described multichannel fm demodulation module comprises two off resonance LC slope discriminators, wave detector, phase-shift network, multiplication IC, fm demodulation IC, Type Multiplicative synchronous detector, the first switch, second switch, the 3rd switch and the 4th switch; The second described buffer is connected with described two off resonance LC slope discriminators, phase-shift network, multiplication IC, fm demodulation IC and Type Multiplicative synchronous detector respectively; Described two off resonance LC slope discriminators are connected with described wave detector, and described wave detector is connected with one end of described the first switch; Described phase-shift network is connected with described multiplication IC, and described multiplication IC is connected with one end of described second switch; Described fm demodulation IC is connected with one end of the 3rd described switch; Described Type Multiplicative synchronous detector is connected with one end of the 4th described switch; The other end of the first described switch, second switch, the 3rd switch and the 4th switch is connected with described speech processing module; Described speech processing module comprises comparator, loudspeaker and phonetic incepting judgement lamp; Loudspeaker described in described comparator connects respectively and described phonetic incepting judgement lamp.
Above-mentioned multifunction speech frequency modulation, amplitude-modulated signal demodulator, wherein, the tuning amplification module of described high frequency small-signal also comprises 8V power supply, one end of described anti-self-excitation resistance capacitance, second level amplifier, the second buffer and anti-Self-excitation Network is connected with described 8V power supply, the other end ground connection of described first order amplifier, the first buffer, anti-self-excitation resistance capacitance, second level amplifier and the second buffer.
Above-mentioned multifunction speech frequency modulation, amplitude-modulated signal demodulator, wherein, also comprise local oscillator, and described local oscillator is connected with described fm demodulation IC.
Above-mentioned multifunction speech frequency modulation, amplitude-modulated signal demodulator, wherein, described speech processing module also comprises power amplifier IC, and described speech processing module is connected with described the first switch, second switch, the 3rd switch and the 4th switch respectively by described power amplifier IC.
The utility model is applicable to teaching and scientific research, industrial communication aspect, can to voice signal, carry out the demodulation of high-fidelity, and signal to noise ratio is high, and cost is extremely low, has high integration degree, and has contained most of radio circuit knowledge; If further increase antenna distance, can realize distant signal transmission, for the transmission of voice signal provides good channel.
Accompanying drawing explanation
Fig. 1 is the connection layout of the utility model multifunction speech frequency modulation, amplitude-modulated signal demodulator.
Embodiment
Below in conjunction with accompanying drawing, further illustrate embodiment of the present utility model.
Refer to shown in accompanying drawing 1, a kind of multifunction speech frequency modulation, amplitude-modulated signal demodulator, comprise signal receiving module 1, the tuning amplification module 2 of high frequency small-signal, multichannel fm demodulation module 3 and speech processing module 4; Described signal receiving module 1 comprises antenna 11 and impedance matching network 12, and described impedance matching network 12 is connected with described antenna 11; The tuning amplification module 2 of described high frequency small-signal comprises first order amplifier 21, the first buffer 22, anti-self-excitation resistance capacitance 23, second level amplifier 24, the second buffer 25 and anti-Self-excitation Network 26; Described impedance matching network 12 is connected with described first order amplifier 21, described first order amplifier 21, the first buffer 22, anti-self-excitation resistance capacitance 23, second level amplifier 24 and the second buffer 25 connect successively, and described anti-Self-excitation Network 26 is connected with described first order amplifier 21, the first buffer 22, anti-self-excitation resistance capacitance 23, second level amplifier 24 and the second buffer 25 respectively; Described multichannel fm demodulation module 3 comprises two off resonance LC slope discriminators 30, wave detector 31, phase-shift network 32, multiplication IC33, fm demodulation IC34, Type Multiplicative synchronous detector 35, the first switch 36, second switch 37, the 3rd switch 38 and the 4th switch 39; The second described buffer 25 is connected with described two off resonance LC slope discriminators 30, phase-shift network 32, multiplication IC33, fm demodulation IC34 and Type Multiplicative synchronous detector 35 respectively; Described two off resonance LC slope discriminators 30 are connected with described wave detector 31, and described wave detector 31 is connected with one end of the first described switch 36; Described phase-shift network 32 is connected with described multiplication IC33, and described multiplication IC33 is connected with one end of described second switch 37; Described fm demodulation IC34 is connected with one end of the 3rd described switch 38; Described Type Multiplicative synchronous detector 35 is connected with one end of the 4th described switch 39; The other end of the first described switch 36, second switch 37, the 3rd switch 38 and the 4th switch 39 is connected with described speech processing module 4; Described speech processing module 4 comprises comparator 41, loudspeaker 42 and phonetic incepting judgement lamp 43; Described comparator 41 connects respectively described loudspeaker 42 and adjudicates lamp 43 with described phonetic incepting.
The tuning amplification module 2 of described high frequency small-signal also comprises 8V power supply 27, one end of described anti-self-excitation resistance capacitance 23, second level amplifier 24, the second buffer 25 and anti-Self-excitation Network 26 is connected with described 8V power supply 27, the other end ground connection of described first order amplifier 21, the first buffer 22, anti-self-excitation resistance capacitance 23, second level amplifier 24 and the second buffer 25.
Also comprise local oscillator 5, described local oscillator 5 is connected with described fm demodulation IC34.
Described speech processing module 4 also comprises power amplifier IC44, and described speech processing module 4 is connected with described the first switch 36, second switch 37, the 3rd switch 38 and the 4th switch 39 respectively by described power amplifier IC44.
The utility model is connected with impedance matching network 12 between antenna 11 and the tuning amplification module 2 of high frequency small-signal, for the impedance matching of signal input circuit; The tuning amplification module 2 of described high frequency small-signal adopts first order amplifier 21 and second level amplifier 24 two-stages to amplify, and at two inter-stages and final stage, is connected with respectively the first buffer 22 and the second buffer 25, to reduce inter-stage, disturbs, improves power amplification multiple; The tuning amplification module 2 of described high frequency small-signal has installed anti-self-excitation resistance capacitance 23 and anti-Self-excitation Network 26 additional in two inter-stages and electric power loop, to improve the stability of amplifier, reduces loop noise; Described multichannel fm demodulation module 3 is connected with speech processing module 4 by the first switch 36, second switch 37, the 3rd switch 38 and the 4th switch 39, for user, demodulation modes is selected; Described speech processing module 4 drives phonetic incepting judgement lamp 43 by comparator 41, for quality of speech signal is adjudicated, the quality that can judge current speech quality according to the brightness of phonetic incepting judgement lamp 43, the brighter voice quality of phonetic incepting judgement lamp 43 is better.
In sum, the utility model is applicable to teaching and scientific research, industrial communication aspect, can to voice signal, carry out the demodulation of high-fidelity, and signal to noise ratio is high, and cost is extremely low, has high integration degree, and has contained most of radio circuit knowledge; If further increase antenna distance, can realize distant signal transmission, for the transmission of voice signal provides good channel.
Claims (4)
1. multifunction speech frequency modulation, an amplitude-modulated signal demodulator, is characterized in that: comprise signal receiving module (1), the tuning amplification module of high frequency small-signal (2), multichannel fm demodulation module (3) and speech processing module (4); Described signal receiving module (1) comprises antenna (11) and impedance matching network (12), and described impedance matching network (12) is connected with described antenna (11); The tuning amplification module of described high frequency small-signal (2) comprises first order amplifier (21), the first buffer (22), anti-self-excitation resistance capacitance (23), second level amplifier (24), the second buffer (25) and anti-Self-excitation Network (26); Described impedance matching network (12) is connected with described first order amplifier (21), described first order amplifier (21), the first buffer (22), anti-self-excitation resistance capacitance (23), second level amplifier (24) and the second buffer (25) connect successively, and described anti-Self-excitation Network (26) is connected with described first order amplifier (21), the first buffer (22), anti-self-excitation resistance capacitance (23), second level amplifier (24) and the second buffer (25) respectively; Described multichannel fm demodulation module (3) comprises two off resonance LC slope discriminators (30), wave detector (31), phase-shift network (32), multiplication IC(33), fm demodulation IC(34), Type Multiplicative synchronous detector (35), the first switch (36), second switch (37), the 3rd switch (38) and the 4th switch (39); Described the second buffer (25) respectively with described two off resonance LC slope discriminators (30), phase-shift network (32), multiplication IC(33), fm demodulation IC(34) and Type Multiplicative synchronous detector (35) be connected; Described two off resonance LC slope discriminators (30) are connected with described wave detector (31), and described wave detector (31) is connected with one end of described the first switch (36); Described phase-shift network (32) and described multiplication IC(33) be connected described multiplication IC(33) be connected with one end of described second switch (37); Described fm demodulation IC(34) be connected with one end of described the 3rd switch (38); Described Type Multiplicative synchronous detector (35) is connected with one end of the 4th described switch (39); The other end of described the first switch (36), second switch (37), the 3rd switch (38) and the 4th switch (39) is connected with described speech processing module (4); Described speech processing module (4) comprises comparator (41), loudspeaker (42) and phonetic incepting judgement lamp (43); Described comparator (41) connects respectively described loudspeaker (42) and adjudicates lamp (43) with described phonetic incepting.
2. multifunction speech frequency modulation according to claim 1, amplitude-modulated signal demodulator, it is characterized in that: the tuning amplification module of described high frequency small-signal (2) also comprises 8V power supply (27), one end of described anti-self-excitation resistance capacitance (23), second level amplifier (24), the second buffer (25) and anti-Self-excitation Network (26) is connected with described 8V power supply (27), the other end ground connection of described first order amplifier (21), the first buffer (22), anti-self-excitation resistance capacitance (23), second level amplifier (24) and the second buffer (25).
3. multifunction speech frequency modulation according to claim 1, amplitude-modulated signal demodulator, is characterized in that: also comprise local oscillator (5), described local oscillator (5) and described fm demodulation IC(34) be connected.
4. multifunction speech frequency modulation according to claim 1, amplitude-modulated signal demodulator, it is characterized in that: described speech processing module (4) also comprises power amplifier IC(44), described speech processing module (4) is by described power amplifier IC(44) be connected with described the first switch (36), second switch (37), the 3rd switch (38) and the 4th switch (39) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597187.9U CN203457145U (en) | 2013-09-26 | 2013-09-26 | Multifunctional voice frequency modulation and amplitude modulation signal demodulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597187.9U CN203457145U (en) | 2013-09-26 | 2013-09-26 | Multifunctional voice frequency modulation and amplitude modulation signal demodulator |
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| Publication Number | Publication Date |
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| CN203457145U true CN203457145U (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320597187.9U Expired - Fee Related CN203457145U (en) | 2013-09-26 | 2013-09-26 | Multifunctional voice frequency modulation and amplitude modulation signal demodulator |
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| CN (1) | CN203457145U (en) |
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- 2013-09-26 CN CN201320597187.9U patent/CN203457145U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140226 Termination date: 20140926 |
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| EXPY | Termination of patent right or utility model |