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.
222
questions
2
votes
1
answer
124
views
How to interpret integer coefficients for a filter generated by Matlab
I have always used high-performance 32-bit microcontrollers with hardware FPU support. To calculate the coefficients of digital filters, I used the fdatool package in Matlab. I used single-precision ...
- 43
0
votes
0
answers
40
views
Is it possible to work with DSD audio on MATLAB?
Just for starters: I am very new to audio processing
I was looking for audio data that is in 1-bit format and I stumbled upon DSD. From what I was able to read it is old but kind of controversial ...
- 31
0
votes
1
answer
250
views
Computing Phase detector in PLL
I have been trying to implement PLL in a STM32 microcontroller. Starting with the first step, I want to implement a phase detector. I tried to first simulate in Python so that I can later use in STM32....
- 129
0
votes
1
answer
991
views
Computing phase difference between two sinusoidal signals
Based on this post here, I tried to calculate the phase difference between sine waves. Here is my code.
...
- 129
0
votes
1
answer
39
views
FIR code implementation question [closed]
I have found this piece of code in Infenion DSP Library (asm code):
Fir_Blk_16()
...
;(ACC)=(ACC)+h(i)*x(n-i)<<1 as comment
I don't understand why the result ...
- 3
0
votes
0
answers
24
views
Given a signal at one scale, how do I scan a differently-scaled signal to see if it contains that subsignal?
Suppose I have a signal with a characteristic shape - say, a right angle ‘cliff’ where it is high, drops like a rock, and stays low.
I now have a bunch of stock data that are at completely different ...
- 1
-2
votes
2
answers
472
views
I have a doubt regarding FFT size in 5G NR 60 MHz Bandwidth
maximum RBs for 60MHz with SCS = 30 kHz is defined to be 162 RBs, so NSubcarriers is 162 x 12 = 1944, 1944 < 2048. Then NFFT size for 60 MHz bandwidth with SCS = 30 kHz should be 2048 instead of ...
- 1
0
votes
1
answer
42
views
Find the impulse response of a causal 52 day moving average system to be used in stock market [closed]
Moving average system……………………….
How to solve this one?
0
votes
1
answer
59
views
Minimum Sampling Frequency
For a continuous time signal with spectrum
$$X_c(j\Omega)=1 \quad\text{for} \quad10\pi < |\Omega| < 50 \pi$$
Choose the minimum sampling frequency so that there is no overlap in the spectrum of ...
1
vote
0
answers
52
views
DSP Clock & Sample Rate Problems (ADAU1172, PDM Microphone)
I'm working on ADAU1772 evo.board with a PDM MEMS microphone.
Microphone's clock is 3.072MHz.
DSP Master Clock is 12.288MHz.
DSP sampling rate is at 192kHz and all DSP modules work with 192kHz.
1st ...
- 87
0
votes
0
answers
536
views
Efficient CIC Decimation Filter in C
Does anyone have advice on efficient CIC Decimation filter implementation. I designed a basic 4th order CIC filter with a 64 decimation ratio in C (below).
I am currently testing this on a Sharc SC589 ...
- 1
3
votes
1
answer
148
views
Difference between lattice and wiener FIR filter
I know the structure of lattice and wiener filter. But I though FIR filter is always FIR (wiener, tap + delay) filter, But what is the advantage of lattice structure, which in the CMSIS DSP filter ...
- 363
0
votes
0
answers
18
views
OBC DA FIR Filter Implementation
I understand the theory of Distributed Arithmetic and its application in FIR Filter implementation to avoid the excessive power consumption in the multiplication operations
But a question here, when I ...
4
votes
1
answer
283
views
STM32F7 Discovery board vs dsp kit tms320c6713 vs Rasberry Pi?
We want to design dsp kit Labs for our undergraduate students for following tasks/topics.
1)Sampling and Quantization of real time Audio Signals on DSP Kit ; analyze the effect of Aliasing and ...
- 83
2
votes
1
answer
85
views
Designing an FIR filter with Gain = 1 on TI DSP processor
I'm trying to design an FIR filter with gain = 1 on DSP processor that does not support floating representation. I'm using MATLAB to design the filter and then transport the taps into my code. The ...
- 23
0
votes
1
answer
49
views
0
votes
1
answer
761
views
What's practical interpretation of showing DC Offset in frequency domain?
In homodyne reciever, we read about LO Leakage causing DC Offset.
Say my output at downconversion is in analog voltage range +5 and -2, and there is a DC offset of 1 unit
So, it can be added right?
To ...
- 29
2
votes
2
answers
98
views
What applications do DSP processors primarily target?
I've recently been reading up on Analog Device's SHARC floating point DSP. It seems cool reading about DSP specific processors, however, I'm curious what applications actually leverage DSPs. For ...
- 793
3
votes
1
answer
68
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 ...
- 31
0
votes
2
answers
58
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.
- 11
0
votes
1
answer
54
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 ...
0
votes
0
answers
38
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 ...
- 11
1
vote
2
answers
76
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 ...
- 11
1
vote
1
answer
125
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 ...
- 121
1
vote
5
answers
266
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 ...
- 21
1
vote
2
answers
134
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 ...
1
vote
1
answer
314
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 ...
- 13
0
votes
0
answers
182
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 ...
- 13
0
votes
0
answers
617
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 ...
- 13
0
votes
1
answer
341
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 ...
0
votes
0
answers
453
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.
0
votes
2
answers
145
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 ...
- 33
0
votes
0
answers
54
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 ...
- 101
2
votes
3
answers
390
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 ...
- 1,850
1
vote
1
answer
147
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.
- 11
0
votes
1
answer
618
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 ...
- 1,850
0
votes
1
answer
175
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 ...
1
vote
1
answer
332
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 ...
- 1,850
2
votes
1
answer
162
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 ...
- 79
1
vote
1
answer
431
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 ...
- 183
-1
votes
1
answer
2k
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 ...
- 121
0
votes
2
answers
619
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 ...
- 13
0
votes
1
answer
47
views
Is there a counterpart for zero forcing in communications in DSP?
If yes, what is forced to zero?
0
votes
1
answer
103
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 ...
- 13
-1
votes
1
answer
345
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 ...
0
votes
0
answers
130
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
- 155
0
votes
0
answers
211
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,
...
- 1
1
vote
2
answers
278
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 ...
- 11
1
vote
0
answers
355
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-...
0
votes
3
answers
153
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-...
- 1