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Questions tagged [modulation]

Anything related to *signal modulation*, i.e. the process of encoding the information provided by some source into the variations of some property (e.g. amplitude, frequency, phase, polarization, etc.) of a carrier signal suitable to be transmitted over a communication channel.

Anything related to signal modulation, i.e. the process of encoding the information provided by some source into the variations of some property (e.g. amplitude, frequency, phase, polarization, etc.) of a carrier signal suitable to be transmitted over a communication channel.

See Wikipedia page on signal modulation.

120 questions
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Least mean square to equalize optical fiber channel

I used a Matlab code of LMS (least mean square algorithm) to equalize the effect of the channel, it is working for a tapped delay channel generated in MATLAB but for optical fiber channel using optisystem program, it doesn’t work well, i think the…
Mai Fouad
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Writing 8-bit PCM sine wave wav file produces overtones

I wrote a program in c++ to generate a .wav file for an 800Hz sine wave (1 channel, 8-bit, 16000Hz sampling, 32000 samples so 2 seconds long), but when I play it or examine its spectrogram in Audacity, it has overtones. I think the problem is with…
Rob No
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FM synthesis using phase accumulator

I'm attempting to implement an FM synthesis operator with feedback using a phase accumulator in C. In Tomisawa's original patent, the phase accumulator going into the adder counts over both negative and positive indices, from -2^(n-1} at a sine…
MattyZ
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I dont understand what is wrong InvalidArgumentError: Conv2DCustomBackpropInputOp only supports NHWC

I am trying to execute this example notebook on modulation https://github.com/radioML/examples/blob/master/modulation_recognition/RML2016.10a_VTCNN2_example.ipynb After executing this from tensorflow.keras.models import Sequential from…
Yohan cyrus
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What is the codec/modulation technique used in Google Tone?

Google Tone uses a codec that creates fairly pleasant sounding tones that convey information. What is the codec and/or modulation technique that is used?
user1002430
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ESP32 - ESP-IDF - Sweep frequency DAC

I'm trying to do sort of a frequency sweep using the ESP32's DAC. Currently I'm not so sure on how to change the frequency without stopping the DAC first. And also stopping the DAC rises an issue since I often get the issue that the DAC has not been…
Mart
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Matlab FM Demodulation and Get Rid of Phase Folding Effect

I have a matlab code to Frequency modulation and demodulation a signal. My code is work well for modulation part. My message signal is m and modulated signal is u, code plot the message signal and its integral in one graph for plotting 1. Then…
Kerim Turak
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How to impliment a Single Sideband Suppressed Carrier Modulator with an audio file as input?

I have been given an audio signal which I imported into Octave using audioread. I have obtained fs and can naturally plot the time domain signal. After an FFT the frequency domain can easily be plotted. My Question is how do I take this signal as…
Rhyston Da Silva
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Simulate 16-QAM on MATLAB

I want to write a program which simulates the modulation and demodulation of 16-QAM. First, this program creates an array of 1000000 randomly generated bits, it groups them as 4-bit values and converts into numerical values. Then it enters 16-QAM…
user6210457
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AudioKit: how to perform frequency modulation for AKPlayer

I'm trying to perform frequency modulation on a signal coming from AKPlayer, which in return plays a mp3 file. I've tried to work with AKOperationEffect, but it doesn't work as expected: let modulatedPlayer = AKOperationEffect(player) { player, _…
Ulrich Vormbrock
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How to generate and receive 16 QAM signal in python?

I want to plot the SNR vs BER plot for 16 QAM. I need help in generating QAM signal I tried generating it but I'm not sure if it is right for n in range (0, itr): EbNodB = EbNodB_range[n] EbNo=10.0**(EbNodB/10.0)#antilog of SNR …
Abi rami
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Carrier frequency of a channel, bandwidth and modulation

I don't understand the meaning of carrier frequency with respect to a transmission channel and the modulation phase with respect to the carrier frequency. I'm at a beginning level, so I try to explain what I get: "the carrier frequency of a channel…
alex_the_great
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Modify the volume frame by frame in a wave file

I want to modulate a wave file frame-by-frame using Python. The wave file is composed of brown noise, so pseudo-random noise. The idea would be: Open the file Mmodulate it with a 40Hz modulation frequency Save the new file I saw that there were…
Pyxel
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Unique stereo input to ScriptProcessorNode

I am hoping to implement audio effects in the Web Audio API which require continuous access to two or more audio streams. I can define a script processor with 2 input channels and 2 output channels: var mod =…
suncannon
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Frequency power vs signal power

I have to analyse a signal which has been modulated with a QPSK using matlab and I can't seem to get things right. What I have: a complex signal sampled at a known frequency. What I want: the power ratio of a certain frequency. So if the signal is…
Leo
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