FM radio frequency measurement and demodulation electronic system
A technology of FM broadcasting and electronic systems, which is applied in the direction of broadcasting receiving circuits, transmission systems, digital transmission systems, etc., can solve the problems that cannot meet the requirements of use, and the use of FM broadcasting monitoring and demodulation systems is limited, and achieve accurate center frequency and communication Frequency Band, High Sensitivity, Effect of Accurate Design
Active Publication Date: 2021-11-30
JILIN INST OF RADIO & TELEVISION
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Problems solved by technology
[0007] In order to solve the problem that the existing FM broadcast monitoring and demodulation system is limited in use and cannot meet its use requirements, the present invention provides an FM broadcast frequency measurement and demodulation electronic system
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[0021] DETAILED DESCRIPTION figure 1 In the present embodiment, the frequency modulated radio frequency demodulating electronic system includes input input, clock input OSC171M, sample output CLK76, data output AUDIO, capacitor C1, capacitor C2, resistor R1, resistor R2, resistor R3 , Resistor R4, op amps U1, D flip-flop U3, with door U4, D flip-flop U5, synchronous enable counter U6, synchronous clearance counter U7, synchronous enable latch U8, synchronous divider U9, lock The depot U10, the latch U12, the multiplier U11, the divider U15, the subtractor U16, the constant outputer U14, and the divider U13;
[0022] The input terminal INPUT is connected to the capacitor C1, and the capacitance C1 is connected to the positive input terminal of the resistor R2, the resistor R3, the resistor R4, and the op amp U1; the capacitance C2 is respectively connected to the electrical resistance R1, and the negative input end of the emulator U1, respectively. connect;
[0023] The output of t...
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An electronic system for frequency measurement and demodulation of FM broadcasting, which relates to the field of radio and television, and solves the problem that the existing FM broadcasting monitoring and demodulation system is limited in use and cannot meet its use requirements, including an input end INPUT, a clock input end, a sampling output end, and a data output end. Terminal, two capacitors, four resistors, op amp, D flip-flop, AND gate, D flip-flop, synchronous enable counter, synchronous clear counter, synchronous enable latch, synchronous frequency divider, latch , latch, multiplier, divider, subtractor, constant output device and divider; the present invention can cancel the frequency discriminator, analog-to-digital converter and the amplifying circuit connected between the two necessary in the traditional demodulation device , reduce the distortion while reducing the cost; the required circuit components are few; the digital data stream of the audio program content is obtained by demodulation, which can be directly played, stored or transmitted; because the program signal is sampled four times the frequency of the pilot signal, in the follow-up There is no need to use hardware to extract the pilot signal during stereo decoding.
Description
Technical field [0001] The present invention relates to the field of broadcasting, and more particularly to a frequency modulated radio frequency measurement electronic system. Background technique [0002] my country's FM broadcast national standard, the frequency modulation broadcast program uses frequency modulation, the maximum frequency is 45kHz, and the three-dimensional left and right channels are used to suppress the carrier bilateral band amplitude 38kHz carrier, and convert the carrier two-point frequency to the pilot signal, and frequency together with the program signal Transmit; traditional program demodulation method is to use the IV Frequency to demodulate the intermediate frequency signal to obtain an audio analog signal. After amplifying the analog-to-digital converter into a digitized sound data stream; during this conversion process, the show signal experience There are many partial links in the circuit, and the introduced noise and distortion are large, and th...
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IPC IPC(8): H04H40/45H04L7/00
CPCH04H40/45H04L7/0079
Inventor 焦杰
Owner JILIN INST OF RADIO & TELEVISION