1000 Threads found on edaboard.com: Envelope Detection
hi elektro guys.
I want to know envelope detection circuit & power detection ciruit.
who have these schematic or diagram.?
Other Design :: 01-10-2003 08:39 :: loverrf :: Replies: 7 :: Views: 4341
if u multiply x(t) by cos(wt) you'll get a signal that is bounded to a signal with the same shape of x(t) that is called the detect it you can simply use RC circuit
RF, Microwave, Antennas and Optics :: 02-02-2007 10:34 :: farzad_m :: Replies: 2 :: Views: 683
i have to narrow band pm modulation and demodulation is simulink. i have done modulation and for demodualtion i am doing envelope detection using hilbert transform. but its giving error .can any one please rectify this error. i am attaching the simulink file.
Digital Signal Processing :: 11-26-2010 06:32 :: khan001 :: Replies: 0 :: Views: 1294
I am working on envelope detection of a speech signal using Hilbert transform in matlab.. It's mentioned that assuming signal is y(n)
abs(y(n) + j*hilbert(y(n)) gives envelope of the signal..
How can this be interpreted intuitively?? I didn't understand the logic behind this... Could someone explain this to me
Digital Signal Processing :: 03-16-2013 02:35 :: anishsingh :: Replies: 2 :: Views: 2183
envelope detection is used to retreive modulation signal from AM signal, to demodulate it.
At FM it is first neccessary to convert FM to AM and use envelope detector as demodulator.
For FM to AM conversion a simple LC tank can be used. It is so tuned that FM signal frequency lies on a slope and not at the tank resonance.
The same (...)
RF, Microwave, Antennas and Optics :: 08-05-2005 21:44 :: Borber :: Replies: 2 :: Views: 2881
I need to detect the envelope of a signal with a 90 kHz carrier wave. Has anyone use the digital envelope algorithm by performing the following digital processes : sample signal, square signal, take a moving average (LPF) and take the square root of the signal.
Digital Signal Processing :: 10-15-2012 04:06 :: klystron :: Replies: 4 :: Views: 814
I have found this
which says that the envelope detector mixes the carrier of an AM signal with the sidebands to produce audio, which makes sense.
From the other side, I thought that an envelope detector does not used as a mixer, but it justs rectifies RF and converts it into a variable volt
Electronic Elementary Questions :: 11-14-2012 05:18 :: neazoi :: Replies: 14 :: Views: 1181
Rectification effect of diode is some DC current throught it. To enable DC current you need circuit where DC current can flow. Inductor at the front end of detector is there for that purpous. Even the video output must be terminated with propriate load resistor. The value of load resistor and capacitor determine the type of rectification you want.
RF, Microwave, Antennas and Optics :: 02-15-2005 23:06 :: Borber :: Replies: 3 :: Views: 2018
Whenever you encounter envelope detection you find the Rice/Rayleigh distribution.
When you need to work with multiple rvs of rice/rayleigh (comparing, ... )
you need the Chi Square distribution.
Digital communication :: 05-14-2007 23:21 :: brmadhukar :: Replies: 2 :: Views: 1214
Does any one have a working Verilog code/ algorithm for envelope detection, phase discriminator and/or frequency discriminator? I already have a working code for demodulation of ASK and FSK but i dont think they'd work for their analog counterpart. Thanks.
PLD, SPLD, GAL, CPLD, FPGA Design :: 06-14-2007 06:31 :: reyge :: Replies: 2 :: Views: 2205
We using FM PLL demodulator with a data slicer as FSK demodulator, my question is what is it a coherent demodulator or non-coherent demodulator?
And FSK demodulator has two another method:
1: general band pass filter and envelope comparator
2: match filter BPF and envelope comparator
What 's 1 and 2 coherent demodualtor or non-coherent dem
Digital communication :: 06-24-2007 23:16 :: wwfhm2002 :: Replies: 2 :: Views: 1939
A MatLab description of a noise gate from literature:
% holdtime - time in seconds the sound level has to be below the
noise gate with hysteresis
% threshhold value before the gate is activated
% ltrhold - thres
Digital Signal Processing :: 11-29-2010 15:27 :: FvM :: Replies: 4 :: Views: 1550
I have no idea as to how much the different demodulation schemes fare when it comes to area.
b) zero crossing
Anybody have Idea of comparitive areas of these two modulation schemes?
PLD, SPLD, GAL, CPLD, FPGA Design :: 01-12-2012 21:27 :: warriorwithin :: Replies: 2 :: Views: 380
I want to extract carrier frequency at the receiver section of IR. The envelope detection is easily possible, Is there any way to extract the carrier ?
Please help me if possible.
Professional Hardware and Electronics Design :: 06-14-2012 08:23 :: Sreejithck :: Replies: 1 :: Views: 259
Direct conversion is becoming more popular with DSP techniques. For traditional analogue circuits though, direct conversion has a number of drawbacks that make it more difficult to use than the seemingly more complex super-heterodyne design.
Drawbacks such as:
Lack of ability to decode AM signals at the baseband by envelope detection.
Analog Circuit Design :: 10-13-2012 12:26 :: FoxyRick :: Replies: 7 :: Views: 772
hi I'm very new matlab and RWR . Tried and succeeded in generating composite ASK and then did FFT for freq spectrum and Hilbert transform for envelope detection. But now with this envelope detection i want to calculate TOA and then sort out the wave and meaasure PRI. Atleast i would be happy if anyone can help me to measure (...)
Digital communication :: 03-28-2013 00:07 :: dipsbals :: Replies: 6 :: Views: 503
under which category will it come?i think that this question is paramount bcos all our receivers were fitted with envelope detector(...indeed a well known fact)
Electronic Elementary Questions :: 12-23-2005 08:43 :: electronics_kumar :: Replies: 3 :: Views: 1617
I want to detect the envelope(amplitude) of a signal V(t)= A(t)cos(2pi*f*t), where f=200Mhz and A(t) is a low-frequency signal (almost dc). The range of A(t) is about 1mV to 10mV. Is there any paper or book talking about such circuit? Thanks.
Analog IC Design and Layout :: 12-26-2005 19:59 :: freewing :: Replies: 3 :: Views: 799
I need help about RF envelope detector design. I have to design it in order to implement an envelop tracking system with a RF power amplifier.
Does somebody have experience in envelope detector design with 3G input signal for example?
What kind of circuit is able to detect envelope and control a DC DC converter?
RF, Microwave, Antennas and Optics :: 12-19-2007 08:19 :: jayce3390 :: Replies: 1 :: Views: 3588
In AM receiver I read that if the SNR is very less then product modulator is better compared to envelope dectector. Why is that so?
Thanks a lot.
RF, Microwave, Antennas and Optics :: 08-15-2012 09:27 :: iVenky :: Replies: 11 :: Views: 1157
I made a dimmer a while back and had problems with the zero cross detection due to mains noise and got tired of it and put it on the shelf. Normally it worked fine but sometimes it could make a sudden flash (once a week). The software is minimal and reliable so I think it is the zero cross, most of the times the mains look fine but sometimes it loo
Professional Hardware and Electronics Design :: 08-15-2001 07:51 :: MrEd :: Replies: 20 :: Views: 4028
I'm looking for a spark ignition schematic end flame detection circuit used in boilers or heating equipment
Anybody who have info thanks
Professional Hardware and Electronics Design :: 04-08-2002 17:11 :: Dark Angel :: Replies: 4 :: Views: 2498
Dear All ...
Is there some simple IC (not a DSP) for the detection of the ringback tone on telephone lines? I've searched the web without success.
Any hint will be appreciated.
Other Design :: 12-21-2002 06:19 :: egeorgiev :: Replies: 7 :: Views: 3340
How do I decide the threshold for quantizing for signal detection.
The MSB (sign bit) is easy, i.e., zero cross over but how about the magnitude bit?
RF, Microwave, Antennas and Optics :: 02-10-2003 07:15 :: brmadhukar :: Replies: 8 :: Views: 1880
How to setup envelope testing for RF circuits?
RF, Microwave, Antennas and Optics :: 03-30-2003 19:37 :: dd2001 :: Replies: 0 :: Views: 1161
Most of the modern VGA cards have a TV-Out SVHS connector, this O/P is capable of sending a standard video signal to a TV set through it's (video in) I/P, bit it does noe enable this O/P if you connect it to the (video-in) I/P of a VCR set. It seemd the vga card detects the I/P impedance of the set or something like that.
As my TV
Professional Hardware and Electronics Design :: 05-13-2003 17:53 :: Bus Master :: Replies: 4 :: Views: 1102
Anybody where can I find the circuitry diagram for IR blocking detection.
The circuit is for detection of a near object (e.g. hand).
I saw some circuit will use a MCU and one 4069.
Pls help me if you know where I can get it.
Professional Hardware and Electronics Design :: 05-20-2003 07:12 :: dragone :: Replies: 8 :: Views: 2115
envelope simulation is used when you want to look at a low frequency signal that is modulated on a high frequency signal. If you use transient simulation on a 1GHz RF signal with 1kHz modulation, you would need very many small time steps to recover the low frequency modulation and it would take a long time. In envelope simulation, you don't sampl
RF, Microwave, Antennas and Optics :: 11-11-2003 14:42 :: toonafishy :: Replies: 2 :: Views: 878
Constant envelope signals can go through class C amplifiers. Nonconstant types have to go through class B with a lot of backoff to keep the out of channel power down. There is a big difference in DC power input between these two methods for the same RF output power.
RF, Microwave, Antennas and Optics :: 12-03-2003 20:59 :: flatulent :: Replies: 4 :: Views: 1187
Most mobile products are designed with Class C power amplifiers, which offer the highest power efficincey. However, because they are nonlinear, requires the amplified signal to have a constant envelope.
why nonlinear PA amplifier a constant envelope?
Because nonlinear PA amplify different amplitudes differently-not l
RF, Microwave, Antennas and Optics :: 01-06-2004 04:23 :: eirp :: Replies: 2 :: Views: 741
I'd like to extract a QAM signal's amplitude and phase from its IF (@40MHz) signal.
I figure an envelope and phase detector will do the job, however I'd like some more information on the design issues entailed. Can anyone point me to a paper or book that describes these in some detail?
Also is there another way to get amplitude&phase?
Analog Circuit Design :: 01-19-2004 09:54 :: my8os :: Replies: 3 :: Views: 2051
I'm studying an efficient light mines detector and it appeard to me that using aGPR(Ground Penetrating Radar)would be the best solution,but I don't know much about radars and didn't fin interesting documentation about this.I would like to build a sweeping synthesis radar,so any help for this would be welcome.Many thanks in advance for your help
Electronic Elementary Questions :: 01-24-2004 11:01 :: vincentz :: Replies: 7 :: Views: 1976
attached very very good software tool for CDMA analysis and multiuser detection using matlab tray it using spanc_me at command prompt
Software Links :: 04-04-2004 10:25 :: anashar :: Replies: 1 :: Views: 3786
In the field of face detection I want to use lookup table of Color for detecting skin color of a face and eliminating other part of picture.
I can adjust a good lookup table for a specific picture but when I use a picture with diffrent brightness the lookup table doesn't work.
I think that brightness of pictures must be equal.
But I haven't
Digital Signal Processing :: 05-25-2004 02:04 :: verilog_crack :: Replies: 0 :: Views: 1119
can you give me some advices about edge-detection circuit?
is it a good design?
ASIC Design Methodologies and Tools (Digital) :: 06-22-2004 05:38 :: sneaker :: Replies: 17 :: Views: 3761
I need a sch for detection of the burned lamps that work with 220VAC voltage and give a logic 0 or 1 for Lamp-OK and Lamp-NOK.
Professional Hardware and Electronics Design :: 07-01-2004 11:37 :: 7rots51 :: Replies: 12 :: Views: 2283
I'm using a RS232 to rs485 converter to connect a PC to a rs485 bus. The bus is half-duplex, so how can I detect if someone is speaking in the bus and avoid collisions??
Could you advise me any rs232 to rs485 converter that has collision detection?
PC Programming and Interfacing :: 07-02-2004 02:55 :: Shek :: Replies: 2 :: Views: 6359
i want distance transform approch to implement number plate detection from captured car image.any e-books,lectures related distance tranform?
Digital Signal Processing :: 07-11-2004 05:55 :: surya_pulipati :: Replies: 0 :: Views: 900
can any body help me in this topic
(food contamination detection) by using microwave imagging
with my regards
RF, Microwave, Antennas and Optics :: 07-19-2004 03:18 :: anos_mas :: Replies: 2 :: Views: 1058
Hi all ...
i have a project about "Vehicle detection" and i am using Inductive Loop method ,i want all thing about this method in details.
such as control module circuits and frequency detection methods (it's very important for me)
looking forward for your help
Thanks in advance
Electronic Elementary Questions :: 09-11-2004 04:28 :: netsearcher :: Replies: 4 :: Views: 1406
How do I write a code in verilog for pulse detection. The pulse width is assumed to be for 1 clock and is positive pulse.
ASIC Design Methodologies and Tools (Digital) :: 09-28-2004 07:55 :: gold_kiss :: Replies: 4 :: Views: 2855
I have an Echo Cancellation project , in which , I want to do the double talk detection part , in Simulink , but as I'm not good at Simulink , I don't know how to create the if clauses , can anybody help me ?
Digital Signal Processing :: 09-28-2004 09:04 :: parisa-b :: Replies: 3 :: Views: 2060
Can anyone know how to build a QRS wave detection circuit or give me some files regarding?
Other Design :: 10-09-2004 05:11 :: Jaky :: Replies: 8 :: Views: 7434
Anyone has the C/C++ source code for Sobel - edge detection filter for color image.
Pls support me the complete souce code.
Digital Signal Processing :: 11-03-2004 20:24 :: chelsea :: Replies: 3 :: Views: 11752
Has anybody got a circuit or a chip to recommend for the USB cable detection
once plugged in ? And also detection when the cable is removed.
I am using USBN9603 and PIC16F877
Microcontrollers :: 12-01-2004 05:01 :: alexz :: Replies: 6 :: Views: 1779
The carrier frequency varies from several KHz to several Meg Hz, and the envelope is very low speed, kilo Herz and maybe even less. How do I design the
detector in analog? The signal is differential. Thank you.
Analog IC Design and Layout :: 12-09-2004 02:36 :: guest3 :: Replies: 2 :: Views: 2184
I'm throwing some ideas around for this year's science fair.
I want to build an electronic glove that can be used to detect 3-d hand gestures.
I had a look into using gyroscopes and microaccelerometers but this is looking a little too complicated. I don't plan to go in the imaging direction for now, either.
I've already seen the PowerGlo
Hobby Circuits and Small Projects Problems :: 01-18-2005 03:41 :: Arron :: Replies: 1 :: Views: 845
Anybody had same problem with flash detection on OCDemon flash programmer for MPC8XX?
Always gives me byte-swapper device/manufacturer ID but readout of flash is correct though...also endiannes settings have no effects in flash detection...
Microcontrollers :: 01-22-2005 07:21 :: davorin :: Replies: 1 :: Views: 756
I am looking for motion detection algorithm. The work should be done to do comparison between JPEG photo to determine moving ogject exists.
I plan to do it with micronctroller wothout DSP.
Please do me a favor. Thanks.
Digital Signal Processing :: 02-21-2005 05:51 :: feiutm9898 :: Replies: 4 :: Views: 2523
Can anyone help me with Sobel's edge detection with simuatable HDL Codes.
how do i input the the matrix and other details please..
ASIC Design Methodologies and Tools (Digital) :: 03-12-2005 22:11 :: arunragavan :: Replies: 4 :: Views: 3006