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0answers
18 views

Half Sine Pulse Shaping design

The standard of 802.15.4 specfies the following 'The chip sequences representing each data symbol are modulated onto the carrier using O-QPSK with halfsine pulse shaping.' For pulse shaping the ...
0
votes
2answers
31 views

Upsampling by zero padding or duplicating sequence

I need to upsample a 2 MHz signal by a factor of 3000 to convert the OQPSK modulated baseband signal to passband. When I upsample by duplicating the elements in the sequence, I seem to get less error ...
0
votes
1answer
30 views

Frequency Spectrum of a sequence

The OQPSK modulator in Matlab produces an output sequence as follows: [0.707 0.707+0.707i -0.707-0.707i ...and so on ] This is the sequence and I am trying to view the frequency spectrum of this ...
0
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0answers
15 views

Theoretical BER - 802.15.4

The 802.15.4 standard gives a formula for the BER calculation but they have considered interference while computing this formula according to what I understood. I am trying to find out what the ...
0
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0answers
17 views

Frequency response of OQPSK Modulated Signal

I am a little confused as how the frequency spectrum of an OQPSK modulated signal would look like. I have a DSSS that is OQPSK modulated with a bandwidth of 2 MHz. The modulated signal has complex ...
0
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0answers
11 views

dsp kits having built-in aes-256 library? [on hold]

i want to ask that is there any dsp kit that has built-in aes-256 library in it? actually, i'm working on a project in which i've alot of other things to do as well and encryption also. so, i was ...
0
votes
0answers
16 views

BER of OQPSK Modulation

I am unable to find out a formula for the BER for the OQPSK Modulation. Currently, I am using the berawgn function from Matlab to calculate the BER for OQPSK but I am looking for an expression for ...
-1
votes
0answers
12 views

DSP and Image Processing Beginner's book

Is there a book for beginner for DSP, signal processing with exercises, that also includes image processing ? It doesn't have to, but it would be nice, as most image processing books I founds assume ...
1
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0answers
15 views

802.15.4 despreading

I am simulating the PHY layer of 802.15.4 standard in Matlab and I need help regarding the despreading of the demodulated signal. Currently I am doing a cross correlation to find the maximum ...
0
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0answers
28 views

FIR Filter Design - from slope and cutoff frequency [duplicate]

I am stuck with the following design requirements for FIR filter: Low-pass -6dB @ 1.6kHz Slope: 24 dB/octave. Ideally I would like to get also FIR coefficients, but any help how to design this ...
0
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0answers
27 views

Different Theoretical and simulated BER curves - 802.15.4 OQPSK [closed]

The plot of the theoretical and simulated BER do not match for the 802.15.4 standard and I need help regarding what parameters I could change in order to make them similar. Here is a simplified ...
0
votes
1answer
27 views

Convert low pass continuous time filter design to bandpass, discrete time

I am trying to convert the continuous time transfer function of a second order lowpass Butterworth filter is given by: To a bandpass fourth order bandpass digital filter, I first apply the mapping ...
2
votes
0answers
18 views

Viterbi Decoder=1/2 k=4 [closed]

Woud anyone have a viterbi decoding tool or c-code or .m file for (R=1/2, K=4)? I am trying to decode a bitstream received in RFSTUDIO from a non-TI transceiver and it says that it uses this kind of ...
2
votes
1answer
83 views

Intuitive explanation of cross-correlation in frequency domain

According to the cross-correlation theorem : the cross-correlation between two signals is equal to the product of fourier transform of one signal multiplied by complex conjugate of fourier transform ...
-1
votes
1answer
41 views

Multi instance DSP C Source code

I need to design a multi instance DSP algorithm implementation. Any reference Open C source code available ? Any links on multi instance implementations. -ben
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0answers
14 views

A Suitable DSO Replacement

Currently I have a Pipeline leakage detection system the concept is that we are using a striker to strike the pipe at the generator side and receive the sound waves at the receiver side both separated ...
0
votes
1answer
43 views

Matlab FIlter coefficients to CMSIS api

I am trying to implement iir Band Pass filter design in STM32F429i discovery kit. I konw that it needs coefficients to be generated from matlab and feed them into cmsis api to achivi filtered data. ...
0
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0answers
37 views

MATLAB band-stop filter design for room reverberation?

I took acoustic measurements of a room using sine swept method, and I also used Pioneer sc-37 to obtain more accurate data. I used RoomEQ wizard software and measured the impulse response of the ...
1
vote
3answers
176 views

Get a N-FFT with two N/2-FFT already computed

After somme researchs on the web, I don't find the answer of my problem (or I don't understand it) and I hope this post will succeed. I'm working on a real-time FFT convolution algorithm (C++) which ...
0
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0answers
33 views

Developing Python code for BPSK Fiber Opticis Communication

I am a beginner both in Python and DSP but eager to take my first assignment tasks. I need to implement BPSK fiber optics communication simulation technique in Python. As per my research I found ...
0
votes
1answer
45 views

Output of a band pass filter

Signal x(t) = | cos(2πft)|, f != 0 is the input of an ideal band-pass filter with bandwidth B = 3f/2. How can i Find the ...
2
votes
1answer
81 views

Real-time block processing setup on ARM

Newbie question here. I'm working on a system that is running a 32khz sampling rate, audio, 16 bit DAC. Previously, our system had a very hard latency requirement of 1 sample. So no problem, we ...
0
votes
1answer
54 views

All pass systems- Poles and Zeros

If an All Pass system has poles at $0.8\exp\left(-j \dfrac{\pi}{4}\right)$ and $0.8\exp\left(j \dfrac{\pi}{4}\right)$, There would be $2\pi$ jumps in the phase (principal value) at angular frequency ...
0
votes
2answers
53 views

convolution of a real and complex signal

How do we define convolution of: $$x(t)= \mathrm{sinc}(W t)$$ and $$y(t)= -j\mathrm{sinc}(2W t)$$ Answer: In the frequency domain, both of them are rectangular functions and multiplication of them ...
0
votes
3answers
74 views

detect impact from digital audio

I've started a hobby project which is to detect and count the number of impacts (for example someone clapping, bouncing a ball or hitting a boxing bag). I've been reading and playing around (in java) ...
0
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0answers
20 views

choosing how many DWT Decomposition levels for 1D

I am building application decomposition of 1D signal sampling frequency $f_s=256$, number of samples $N=512$ - how many levels if the above signal passed through LPF of $70 Hz$ $f_s=256$, number ...
0
votes
0answers
13 views

DSP whinning noise when connected to audio source

I have a development board of a DSP. However as a beginner I dont get some things. Connecting a microphone and configuring ADC , DAC works somewhat fine instead of some white noise no matter if DAC ...
1
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0answers
102 views

DSP interview question: use of the identity in development of a significant transform

I'm preparing interview and found this question. But I don't really understand what is the question. Does it ask about Fourier transform or Z transform? How the simple identity $$xy=\frac{1}{2}x^2 ...
0
votes
1answer
80 views

Beginner's Books [duplicate]

I come from a background of computer science and I got interested in image processing but it requires a lot of signal processing, so could someone provide me a good beginner's book, that maybe first ...
1
vote
1answer
48 views

Iterative Kalman filters and system parameters estimation

i am working recently on a project in which i want to implement a Kalman filter as being an observer, and i couple this observer with a state feedback controller that produces control actions ...
2
votes
2answers
144 views

Differences between DSP programming vs MPU programming

I'm moderately skilled in programming classic microcontrollers. Embedded C, built-in peripherals, interrupts, the daily bread of an Embedded programmer. I'm interested in expanding my skillset onto ...
0
votes
1answer
32 views

High Speed Digital Signal Processors [closed]

Can anybody suggest me the highest speed DSPs available in the market now. Also, what would be the best for a filer design application a DSP or an FPGA?
0
votes
3answers
103 views

What is a translation property in DFT

Hi someone please explain me the translation property of DFT. I am not able to understand it neither from Gonzalez nor from internet. I have done extensive study on this but not able to get it. Really ...
2
votes
2answers
206 views

Thoretically, what makes multi-pitch detection so difficult?

For multi-pitch detection, I mean for example pressing several piano keys at the same time. For signal pitch detection (pressing one key at a time), after FFT, mostly the frequency with the largest ...
0
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2answers
94 views

Best method to do piano key pitch detection?

For example, when playing piano, at the same time, print out the key notes by analyzing the signal of piano sound. How to do some pre-processing to remove the noise? When calculate with FFT, noise ...
0
votes
1answer
149 views

Natural, Forced and Total System Response - Time domain Analysis of DT

I am a self-learner of DSP by reading related books. While reading Time domain Analysis of DT (Discrete Time) system, I suddenly got introduced to difference equation representing a system. It then ...
0
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0answers
32 views

A/D converter quatization noise

I read that in A/D converter we usually use rounding or two's complement truncation and not the sign magnitude or 1's complement truncation as in this case the quantization error is correlated to the ...
0
votes
1answer
106 views

white noise filtering

If I have a white noise fed into a filter what would be the output of the filter - what would you expect to see? I know that white noise has a unit power spectral density (PSD), how these thing relate ...
1
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0answers
67 views

DC offset removal from tetra signal

Hey I want to remove DC offset from tetra signal captured as inphase and quadrature phase samples(I and Q samples). I and and Q samples are 16 bit signed values. I tried averaging 2000 I and Q samples ...
-1
votes
4answers
382 views

What is meant by Impulse Response [duplicate]

I have read in all books that: Impulse(n) = 1 when n=0 , 0 otherwise So when we state impulse response of signal x(n) I do not understand what is its actual ...
4
votes
1answer
111 views

Dual-Tone Multi Frequency signalling

Does anybody know why we need 2 different tone signals: one high frequency and one low frequency to create a tone burst in Dual-Tone Multi Frequency signalling? For example, to create a tone burst of ...
2
votes
2answers
106 views

Verifying channel response identity

If $x[n]$ is input signal, $y[m]$ is output signal, $h[m]$ is impulse response of the channel, then the following relation holds $\lvert Y(\omega)\rvert = \lvert H(\omega)\rvert^2 . \lvert ...
0
votes
1answer
120 views

Best way to inverse Hilbert on FPGA?

I have a real signal that is being sampled via ADC and passed to a Xilinx V6 FPGA. I then do a Hilbert transform on it using the FIR compiler core and get the complex signal (I and Q) to tweak the ...
0
votes
1answer
68 views

DSP - Sinewave: what is $2\pi f t $?

I am a beginner in DSP and is familiar with $\sin(\theta)$ declaration (as studied in trigonometry) - where $\theta$ is the angle it makes with X - axis. Please tell me what does $\sin(2\pi f t + ...
4
votes
1answer
130 views

Under what condition is the available bandwidth $f_s$ instead of $\frac{f_s}{2}$?

Can someone help me with this interview question? It is about the sampling frequency rate. Under what condition the available bandwidth is $f_s$ instead of $\frac{f_s}{2}$?
1
vote
2answers
329 views

Recommendations for DSP Hardware

I'm trying to figure out what a good DSP unit would be to try and learn how to do some embedded programming on? I would like something relatively inexpensive but that still has a decent amount of ...
0
votes
1answer
318 views

Band Limited Impulse Train Synthesis

I'm currently working on a piece of DSP/Synthesis software and I have run into the issue of generating band limited waveforms. I have been doing some research to try and find a good solution but I ...
2
votes
0answers
107 views

Realtime image-stitching using a CMOS camera array

I am very new to DSP so please excuse any brevity... I have to design a 4x4 CMOS camera array and stitch the images together for further processing... I have tried doing that with opencv but the ...
1
vote
1answer
180 views

How to prove energy is preserved in sampling using Parseval's Relation?

I have a continuous signal,xc(t) which is bandlimited to =pi/T , and x[n] = xc(nT) are samples of this signal. I need to show there is a Parseval's relation between the original signal and the sampled ...
0
votes
1answer
63 views

regarding plots in visual dsp ++ 5.0

For my source code witten in c ,in visual dsp++ 5.0 for a forward error correcting code on adsp 21062 sharc family platform. i want to plot a graph between different data sets. when i tried to use the ...