Questions tagged [dsp-core]

**Do NOT use this tag for general questions about digital signal processing!** A DSP core is a processing unit specialized for digital signal processing tasks.

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32 views

Verification of intermediate outputs in Signal processing chain of FPGA

I have two ADC interfaces with FPGA and 32-bit processed output data from FPGA. I have an IO signals to verify the Inputs and Outputs of FPGA. But I dont have any test points to verify the ...
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2answers
35 views

Why we sometime use some values of fixed point and floating point both in dsp?

I have been writing kernels for a communication dsp device, which uses cmac/cmad operation on fixed and floating point numbers. I am not very clear why both types is used in the same operation.
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ECG SIGNAL ANALYSIS USING ADAPTIVE THRESHOLD

I am trying detect the R-peaks in ECG signal using adaptive thresholding method in MATLAB. I have done till preprocessing of the signal and find the local maxima of the signal but I am unable to ...
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1answer
34 views

Digital Filters

If I want to remove the baseline drift in my ECG signal, which digital filter should be used without distortion and shift in my filtered output? What are the necessary things I have to look for the ...
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2answers
97 views

What is the formula to calculate the frequency response?

I'm newbie of dsp so i have a question for u guys: signal= [ -0.0018225230, -0.0015879294, +0.0000000000, +0.0036977508, +0.0080754303, +0.0085302217, -0.0000000000, -0.0173976984, -0.0341458607, -0....
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1answer
68 views

Digital Audio Amplifiers

Can anyone tell me why a filter that blocks DC signal in an Amplifier would have a cutoff frequency of 4 Hz . Why would someone choose a frequency as low as 4Hz to filter out DC content before ...
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0answers
31 views

How to replicate/simulate experiments done on dsp kit 6713 without using hardware?

Due to covid, our university is now offering online classes to under grad students, even labs are conducted online. But we are bit confused regarding evaluation? We make videos of demonstration of dsp ...
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2answers
45 views

Options for DSP hardware for Under Grad Lab?

We have TI 6713 dsp kits in our Lab but since those kits are very old(They were started/released near 2000) we are now considering to get new dsp kits ,so our under grad students may clear their ...
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1answer
34 views

Why does the sound play faster

I am trying to duplicate a stereo channel into four channels. When I do that the sound plays twice as fast. it's PCM raw data Basically trying to copy the stereo bytes into four channel buffer. In ...
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0answers
74 views

Stability of filters with negative phase delay, group delay, and positive phase

Lets assume I have an IIR filter with : bz = [1.0195 0 0]; az = [1 0.0166 0.0020]; fvtool(bz,az) The filter is stable as i can see. If you check the phase delay ...
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139 views

DSP Book with More Applications

The process of my DSP class used the Oppenheimer DSP book as text. Although I can easily understand the math in the book, I found it lack examples and applications, hence I still cannot build a ...
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1answer
54 views

Is there any way to align temporally two signals in spectrogram?

I am keen to know that If I have two signals say : Farend_signal (y[n]) and Nearend_signal (x[n]) and x[n] also contains an echo of y[n] with some delay. Is there any technique to align these two ...
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37 views

How to subtract echoed signal from mixture of voice and echo signal?

I am working on an echo removal project. So far, I have successfully identified the far-end signal of length 21 ms at a sampling rate of 48000Hz whose echo is present in my near-end signal of 21ms. I ...
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1answer
94 views

Echo removal from a chunk of PCM signal

I have implemented a paper regarding echo detection in real-time using MFCC coefficients. Now, I want to remove the echo from the mixed signal. Let me explain it as: There are two signals, NearEnd ...
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5answers
163 views

Effect of One Sample Latency in Audio Application

I am dealing with a customized processor that has a processing latency of one sample (20.8 microseconds) at 48kHz Sampling rate . What I would like to know is ...does this latency of one sample have ...
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3answers
89 views

QAM Amplitude Levels

I'm working on a project to stream video between 2fpgas by using QAM. While mapping symbols with different amplitude pulses(PAM) a question popped up in my mind. In real life how does communicating ...
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1answer
182 views

number of multiplications per second required by the system

Consider a system implementing a rational sampling rate change by 5/7: for this, we cascade upsampler by 5, a lowpass filter with cutoff frequency π/7 and a downsampler by 7. The lowpass filter is a ...
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0answers
105 views

minimum oversampling factor for D/A converter

Consider a D/A converter for audio signals consisiting of a zero-order-hold interpolator followed by a continuous-time lowpass filter with positive passband between 0 and 20KHz and stopband starting ...
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434 views

the number of multiplications per second required by the system

Q1. Consider a system implementing a rational sampling rate change by 5/7: for this, we cascade upsampler by 5, a lowpass filter with cutoff frequency π/7 and a downsampler by 7. The lowpass filter is ...
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1answer
79 views

Detect static in audio with Python

I have a program running in python. It samples the demodulated FM output from an SDR. When there is no transmission, the input to the program is completely static. How can I go about squelching the ...
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0answers
63 views

How can I determine the fundamental period of the signals?

How can I find the fundamental period of the given signal? Can anyone help me, I am stuck. $x(t) = cos(2πt) + cos(4πt)$ $y(t) = cos(2πt) + cos(2t)$ Thank you in advance.
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2answers
80 views

Hardware kits for DSP Lab?

I have been assigned responsibility as Lab instructor of DSP at undergrad Level and so i have to equip my lab,please recommend which processors should i purchase for hardware implementation of dsp ...
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0answers
31 views

Efficient way to calculate eigen-values of a 2x2 matrix

I'm working on an algorithm that works based on finding the eigen-values of a 2x2 complex covariance matrix. However, from a fixed-point implementation point of view, finding eigen-value of a matrix ...
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3answers
261 views

Confusion understanding digital signal processor?

I am reading wikipedia article about digital signal processor and as shown in end of attached snapshot ." Most general-purpose microprocessors can also execute digital signal processing ...
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1answer
63 views

Why SRS signalling is used in 5g?

Since DMRS is also being used as a reference signal in PUCCH and PUSCH channel, so why an extra SRS signalling is required.
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1answer
287 views

general purpose microprocessor vs DSP(digital signal processor)?

I know that DSPs are specialized processors but i want to know what will happen if DSPs are replaced by general purpose processor in their applications? I know one application,mobile phone,will that ...
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1answer
68 views

Why is it that the input to an IFFT is first reordered in an OFDM Modulator

I am back with my questions! I recently came across a paper titled "Low Latency IFFT Design for OFDM Systems Supporting Full-Duplex FDD" where they claim a new method of IFFT input mapping ...
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1answer
78 views

simulator for dsp kit tms320c6713?without using actual hardware kit tms320c6713?

As you know, most universities across the globe are closed due to pandemic and people are unable to acess research facilites ,so in such a scenario one wants to improve his dsp hardware programming ...
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1answer
59 views

Selecting a Digital Signal Processor for a Specific Image Sensor

I am working on developing a camera and I am trying to select hardware for the camera. I believe that I may need a digital signal processor to compress image data before it is transmitted to a ...
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1answer
237 views

What does librosa.load return?

I'm new to signal processing and I'm working with librosa library quite a bit. I would like to know what is the information that is returned by librosa.load function when I read a audio(.wav) file ...
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1answer
926 views

How to Find spectral Peaks from 2D array of Spectrogram? [closed]

I have computed a Spectrogram 2D array as : How to develop a spectrogram (2D array) from audio signal? Now, I want to find spectral peaks to find the respective temporal displacement. In python using ...
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2answers
179 views

Q format doubts

Is my understanding correct w.r.t Q format. signed Q15.1 format means, 15 bits for fractional and 1 for integer bits SO max range is - 2^15 / 2^15 to + (2 ^ 15 - 1) / 2^15 signed Q7.0 means, 7 bits ...
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1answer
44 views

Is there a counterpart for zero forcing in communications in DSP?

If yes, what is forced to zero?
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1answer
55 views

Why does my signal magnitude increase after adaptive filtering?

I am using a series-cascade of multiple NLMS adaptive filters each with step size 0.0040, leakage factor 1.0, and 100 filter taps. My signal gains magnitude at each step of the filtering, say the peak ...
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1answer
183 views

Help in designing filter for DUC (Digital Up-Converter) and DDC (Digital Down-Converter) using the built-in DUC and DDC blocks in MATLAB Simulink

Can anyone please help me in simulating a simple BPSK transceiver system that correctly receives a signal through a DUC and DDC? I have attached the screenshot of my Simulink system along with ...
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0answers
54 views

Relation between Gaussian and bi-Gaussian distribution

A Gaussian Doppler Spectrum can be seen as a bi-Gaussian Doppler spectrum in wich only one Gaussian function is present ( the second having a zero power gain) ? any help will be really appreciated
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158 views

How to compute position by FFT?

I have FFT data of x, y, z - axis, Now I'm trying to find the position through FFT data. Step 1 : For that, applied corresponds to an ordinary frequency i.e rad·s−1, ...
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2answers
142 views

Optimization of execution time of audio capture call in c/c++ (ALSA)

I am working on a Audio Deep Learning Project. In this C++ project I need to capture real-time audio and then do pre-processing and the pre-processed output is fed to the Deep Learning Network. I am ...
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0answers
179 views

Early-Late Symbol Synchronizer on Non-Triangular Pulses

I've been studying the basics of digital communications using the free book at desktopsdr.com. One of the examples is a 4-QAM demodulator which where symbol timing recovery is done with some Early-...
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3answers
99 views

Basic Understanding of Convolution Operation

I would really appreciate any help in understanding this. If $$y[n] = x[n]*r[n]\tag{1}$$ then what is $y[n-n_0]$ for any system? Is it $$y[n-n_0] = x[n-n_0]*r[n-n_0]\tag{2}$$ or $$y[n-n_0] = x[n-...
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1answer
325 views

What is the slope of a transfer function?

Lets say I have a Transfer function (H) plot as below. I need to find the SLOPE of the transfer function in dB/MHz. That is... i need a plot (db/MHz) vs frequency. How can i go about it ? ...
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1answer
55 views

what is the C/D equation in dsp?

I have one example test question by this kind: So in this ebook (Digital Signal Processing Using MATLAB) as the DSP references and not found C/D block equations on it? and this c/d search results? ...
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335 views

DSPs in mobile phone?

I know about one application of DSPs ,that is a smart phone such as Samsung S4,but what about normal cell/mobile phone such as nokia3310?Is it also contains a DSP(Digital Signal Processor)?
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0answers
18 views

Digital signal processing how audio wave and function chage with respect to each other

If an audio signal is f(t) and if i play same audio with 2× speed then what will function of 2× speed signal f(2t) or f(t/2) and why?
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1answer
29 views

DFT calculations returning different results

My coworker ran a DFT query using a software in C downloaded to his PC. His results was the following chart: I am using a JS tool from corbanbrook/dsp.js My results were very different. any ideas ...
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1answer
177 views

Stability of the Low pass filter after Spectral Transformation

Using a spectral transformation a filter $G(z^{cap})$ is designed to be a low pass filter from an existing lowpass filter $G_{lp}(z)$ via $G(z^{cap}) = G(z)z=H(z^{cap})$ . Which property should H(z) ...
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1answer
392 views

Preprocess sound for voice recognition in Pocket Sphinx on Raspberry Pi 3

I want to improve my voice recognition system on a Raspberry Pi 3 running Pocket Spinx. It's pretty accurate (limited recognition vocabulary) but is terrible when other noise is around. Is there any ...
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1answer
44 views

LOW SIGNAL NOISE RATIO FFT

I am processing an audio signal with CS4244 codec at 24 bits and 48kHz. Every 2048 samples the FFT is calculated and its amplitude. Without input signal I get FFT values ​​close to 30dB. With maximum ...
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3answers
2k views

Career in signal processing

I am doing my MSc in electrical engineering, and there are not many courses in my university on signal processing. I want to develop my skills in signal processing such that I have a hold in one ...
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1answer
67 views

Moving from books to implementations

So after a good while of digging and practicing, I think I've managed to gain a decent intuition for some of the very core concepts related to linear systems, filter coefficients/parameters, FIR/IIR ...

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