analog demodulation

Original link: http://www.elecfans.com/analog/20120509270848_4.htmlAmplitude modulation and detection circuitsRadio and radio communication is the use of modulation technology to add low-frequency sound signal to the high-frequency signal emitted. The process of restoring in the receiver is called demodulation. wherein the low frequency signal is called the modulation signal, the high frequency signal is ca

modulation signal generationThere are two main kinds of modulation signals, direct method and indirect method. The indirect method achieves high cost and complexity. Direct modulation is modulated signal m (t) directly control the frequency of the oscillator so that it changes linearly according to the modulation signal law. The orthogonal modulation of FM signal is an implementation method of indirect FM.Three. 4FSK modulation and demodulation algor

corresponding spectral value Bessel (i+1) =besselj (i,5); Calculates the corresponding Bessel function value, mf=5Endabessel4.FM signal non-coherent demodulation%FM signal non-coherent demodulation FC= 5e3; %Carrier Frequency FS= 100e3; %Sample Rate N= Length (s_t); %sample points [lpf_b,lpf_a]= Butter (Ten, (fc/2)/(fs/2)); %Design Low-pass filter T= (0: N-1)'/fs;% time Tr_t =s_t;r_d_t= [0;d iff (r_t)];

Reprinted please noteArticleSource and author! Source:Http://blog.csdn.net/xl19862005 By xandy) I. Demodulation Circuit In my design, the demodulation end uses the MSP430 single-chip microcomputer, because the power consumption of Ti series single-chip microcomputer is very low, in sleep state, the current can reach UA level, under normal operation, the current can also be kept at several Ma level

Verlog language Before the interview really passed ...1. Unsigned---Signed2. Quadrature demodulation--1. Multiply the Cos 2. Take sin.3. Quadrature demodulation---low-pass filteringModule demodulation (INPUT wire CLK,Input Wire clk_enable,Input Wire Reset_n,Input wire[9:0] Din_data,Output WIRE[9:0] Dout_data);//////////////////////////////////////////////////////

Tags: style blog http io color ar os for SPI. QPSKorthogonal Phase shift keying (quadrature Phase Shift keying) is referred to as "QPSK" and is a digital modulation method. It is divided into two kinds: absolute phase shift and relative phase shift. Because of the phase ambiguity problem in the absolute phase shift, the relative shift phase is used to dqpsk the method. It has been widely used in wireless communication and has become a very important modulation and

MCU is a typical digital system, digital system can only be a digital signal processing input, its output signal is also digital. However, many quantities in industry or life are analog, which can be converted to the corresponding voltage, current and other analog quantities by the sensor. In order to realize the measurement, operation and control of the digital system, it is necessary to convert the

Analog serial port Driver Based on Listen 8 common IO port The format of standard serial communication data is:Start bit (1) + Data bit (8) + check bit (1) + stop bit (1) Another important part of serial communication is to set the baud rate,The baud rate is the number of bits transmitted by the serial port within one second. Sampling frequency:In order to reduce the error of reading or sending serial data, we took the data read at a fixed

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