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216 Threads found on edaboard.com: Am Demodulation
i was wondering if anyone know how much AM demodulation gets better (SNR and linearity) when using product demodulator than using envelope detector.
in practical systems the if = 10.7 MHZ or 455K 10.7MHz for FM and 455K for NBFM or AM , it can be also 70KHz
Hello to everyone! I am new to this forum and i don't have huge knowledge in electronics. Just the please excuse anything that may seem akward to you ( i mean of what i write :blush: ) The question i have is : Suppose we have two signals. Call them m1(t) and m2(t). We modulate each one with AM modulation. So we get two separate
To demodulate an AM signal you can use the formula sqrt(I^2 + Q^2) where I,Q are In phase and quadrature components. Then extract the dc component of the signal (= LP filter) which is related to the carrier amplitude. For suppressed carrier you could extract the dc component directly from the envelope of the modulated signal. Regards Mow
AM demodulation : an envelope detector : diode into RC circuit FM demodulation : cut off slope of bandpass filter converts change in frequency to AM signal and then an envelope detector : diode into RC circuit
To demodulate AM, I use the formula am = sqrt(I*I + Q*Q) I am mixing an AM IF signal to baseband, i.e. carrier plus 2 sidebands. My test signal is modulated at 800Hz. When I look at the demodulation, it looks OK when I mix perfectly to 0Hz, but as the transmitted signal moves up or down frequency, I end up with 2 frequencies in the demodul
I have a ciruit diagram of an AM RECEIVER (118Mhz-136Mhz) in which the IC CA3075(FM IF AMPLIFIER LIMITER) and CA3012(FM IF WIDEBAND AMPLIFIER) are being used. I dont get it why are FM ICs being used in an AM receiver.Please help.
?In AM synchronous demodulation, Why we don?t divide the received signal, m(t)coswt, by cos(wt) using a simple divider circuit instead of multiplying by cos(wt)?? I asked this question to two professors and I got different answers: #Professor 1 Reply: "For your scheme to work you must know exactly what the frequency w is that the transmitter
How to program a VHDL to implement demodulation of AM, FM, PM, PSK, QPSK, PCM, FSK, ASK, CDMA.. on FPGA (Xilinx) could anybody give me some advice, CORDIC or some other algorithms are appreciate, thx in advance.
Hi I am interested in lowfrequency RF-simulation, and I wonder if there is a software that lets me simulate circuits with various types of tapped inductor and tapped transformers. Especially I want to simulate an AM-demodulation stage with an inductor cupled to the transistor collector, an inductor at the emitter an iron core that couples th
hi anyone out there who has used E4407b spectrum analyzer digital demodulation personality. i am planning to upgrade my spectrum analyzer for this purpose. anyone who can guide me in this regard. is it useful. thanks
Hello I am searching for a SSB (single sideband ) demodulation routine or core or whatever in VHDL!!! pls answers ich u know something
Hello I am searching for a SSB (single sideband ) demodulation routine or core or whatever in VHDL!!! pls answers if u know something
Please help me on this project. SPECIFICATION: 1)I want to control a AM reciever circuit with computer so that I recieve local radio transmission and listen the recieving signals on computer's sound card. 2)I want to tune channels by computer.
The Costas loop is an optimum solution. All methods will have the 180 degree phase ambiguity. There are two ways around this. One is to have a known preamble. The other is the differential way which will produce twice the BER because one received bit error will affect two data bits.
I came across the following site ( ) using TV tuner as communication receivers. The tuner mentioned is difficult to source now. With the availability of cheap TV cards for the PCs (with built in tv tuner outputting video and audio directly), can the following be done (the tuner will be remov
I have done something on softradio: Down Convertor, CW, SSB, AM demodulation, noise design is based on Blackfin BF531 and is still under going, discussion are welcomed. mike -----------------------------------------------------------
Personally I wouldn't use CD4046 as FM-demodulator. So far I haven't come across even one properly working demodulator based on this IC. Different story with ICs such as NE564: always works veery well and you can find plenty of applications and diagrams on the web. Anyhow, if you would like to continue with 4046 could you pkease advice your con
I am making a modulation FM in to digital signal of 5v and 200kHz. - When the level is of 5v the modulated signal is of 10'58 MHz - When the level is of 0v the modulated signal is of 10'81 MHz I have tested with demodulador TBA120, and works correctly, but this component works until speeds of 56KHz. Somebody can indicate to me I can demodul
i am transmitting 2 different frequencies for binary 1 and 0 (or a frequency for 1 and no frequency for 0). Is there anything i can do to convert these frequencies into digital form without using a demodulator chip,using comparator circuit or something like that. (i have heard the use of comparator for this purpose)
I have the same problem, have you found the answer? do you know how to perform soft decoding for LDPC codes by using I and Q data form demodulator? Please inform me if you have any paper about this topic Thanks in advance
Hi all Perhaps my question is stupid, but I am momentary at the end of my ideas. What the heck is the demodulation of AM if I have a I/Q signal ? My homebrew HDR-2005 (= HardwareDefinedRadio 2005 ;-) is a mixture between QRP2001, SDR-1000 and other concepts. It sounds great in SSB. I demodulate LSB, USB or both but not AM. Yes, yes I know M = s
Hi all Perhaps my question is stupid, but I am momentary at the end of my ideas. What the heck is the demodulation of AM if I have a I/Q signal ? My homebrew HDR-2005 (= HardwareDefinedRadio 2005 Wink is a mixture between QRP2001, SDR-1000 and other concepts. It sounds great in SSB. I demodulate LSB, USB or both but not AM. Yes, yes I know M = s
Hi I want to use digital techniq to implement AM/FM modem for a transceiver. Now I need some help about it such as the best scheme for designing or ADC, DAC and DSP selection. The IF signal is 1.4MHz. Another import thing is the MIPS that these modulations/demodulations need. Thank you. Agha
Hi guys can you please help me i am simulating an fm system here is the code below I am having a problem on the demodulation side I am trying to demodulate using PLL desgning (Phase Lock Loop). But it is giving me an error at last line R has to be positive number I think its R please help I am giving up = mp3read('jem.mp3'); s
I too am doing similar work, any body with any suggestions??
i am new to vhdl. Is it possible to design fsk, psk modultion and demodulation in MODELSIM( bcoz thats what i have), i dont know how to bring sine wave in that..can anyone help me. otherwise anyother simulation tool is available for this???
Hi! Please help me with these questions: 1/With an AM DSB modulation system using Balanced Modulator,what is suppressed-carrier figure?And how to measure it? 2/With SSB demodulation system using Product Detector,if LO frequency increases,how is the output frequency at USB and at LSB? Thanks!
I am working on project .. i need to simulate bluetooth modulation and demodulation in Matlab. if anyone has anymaterial or matlab design of blocks or anything pls give me link.... or any bluetooth documantaion...
hi, i am working on the synchronisation of dab receiver in which ofdm technology is used. I removed the coarse and fine frequency offsets by running a nco. I also synchronised the fft timing window with the peak of channel impulse response at the zeroth index. Now i differentially decode the received ofdm symbols with the previous ones. In this pr
In AM modulation the modulator is a multiplier i.e. a mixer. In digital modulation the mixer is just a part of the whole modulator/demodulator. In FM modulation the modulator is basically a VCO, so if you send an FM signal to a mixer you have just upconversion or downconversion. Bye
hellow , i am in need of pulse position modulation demodulation code in Verilog, i wil b thankful to those who help... regs, sunil
I need a help in this project MATLAB GUI for AM modulation and demodulation, it must include four types of AM (DSB-LC, DSB-SC ,SSB). The GUI will display signals in time domain and frequency domain. The GUI must be able to modulate and demodulate various common signals and speech signals (read from .wav files). And the user can change the parame
i am transmitting the signals and reciever is reciving it from two paths. Let (2+i) be the transmitted signal from one path and (5-7i) be the signal transmitted from another path. At the reciever they will add and make (7-6i). Is there any way to get the two orginal signals back from the recieved one i.e. (2+i) and (5-7i) from (7-6i) ??? Waiting
I need to simulate AM signals using Matlab please help me...................... thanks in advance
Oh... I read a topic here about soft radios dated 2 years ago... i cant believe its still proprietary. perhaps there are public algorithms ^_^ Added after 4 hours 58 minutes: I have done some research (inside and outside of the forum), some have implemented FM demodulation using all digital PLLs and FIR fil
I am doing the ultrasound signal doppler demodulation. Specificly, with a singal with f0, and another signal f0+fd. I want to get the fd. What kind of chip could realize this ? Thanks!
Hi fellas, I am doing CCK demodulation by 802.11 standard. I have a signal which is a real WLAN packet but i am doing the decoding off line. I know where the CCK modulation starts in a WLAN packet so i starts decoding from that very instant. My operation steps are listed below: 1. I downsample my data from 200Mbps to 11 Mbps 2. At 11Mbps, i ad
Hi, Since silicon diode has higher cutin voltage you need to amplify the RF before rectification, unless probably you are very near to a radio station. Otherwise, only Germanium diodes will work. Regards, Laktronics.
plzzz can anyone provide program for it i serched but i didnt get the pgm
Hi, I've just studied FPGA for a short time. At that time, I've built successfully a QAM-16 modulation project using VHDL code. But now, when I try to build QAM demodulation, I've met a big problem. I've done the demodulation in matlab, but in FPGA, I can not synchrolize the receive signal with the carrier recovery. I mean I can't recover symbol
If x="10101100",How to sampling and plot s(t),y1(t),y2(t),x1,x2,I need MATLAB code,Thank you very much!
HI FRIENDS, I am working on QPSK Demodulator implementation in VHDL. We had used Gardners algorithm (Ij-1/2 *) for BIT TIMING Loop. My doubt is whether to delay my next input signal for 2 clk periods. Or can i give it after a clk delay(since as per algotithm is force two with a duration of clk period it might give me a different res
hello I need a a carrier recovery system for demodulation of am and dsb that generate a synchronous signal with carrier frequency to mpultiply with am and dsb signals Thanks lot
The upper and lower halfes of wave will be cut in envolope demodulator in case of overmodulated AM wave.
Hi,...i am working on an SDR project ,...i need the AM recorded files for signal processing, (demodulation) ....can anybody give me some link to get them (with the frequency indicated)
Can superheterodyne receivers demodulate FM and PM signals ? or is it only applicable for AM demodulation ?
Can anybody kindly provide me the links or upload simulink models for AM/FM demodulation. Thanks in advance
It may be the case, that you have an unusual high Q LC tank, or antenna matching filter. But simply tuning it to the carrier should remove any sideband unsymmetry. As another explanation, the same buggy SDR may be utilized at the receiver sites.
Hi, My code is as follows: Fs=100e2; T=1/Fs; L=10000; t='/Fs; fm=10; fc=48e1; ka=0.1; %% 0demodulation =butter(5,fc*2/Fs); z=filter(b,a,y); NFFT=2^nextpow2(L); f=Fs/2*lin


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