Questions tagged [dsp]

DSP stands for Digital Signal Processing or Digital Signal Processor.

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2answers
318 views

AXI interface of an FFT core expecting more data than it should

I am working with the FFT v9.0 core from Xilinx. The FFT is configured to use the Radix-4 Burst I/O architecture. When I reach the last element of my signal, I set ...
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1answer
101 views

How can I Access Tiger Sharc DSP processor through host pc?

I am working on designing of a test board which involves both FPGA(Xilinx- Kintex 7) and DSP(Tiger Sharc) based signal processing. Now the end user wants to access the DSP processor programming ...
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1answer
675 views

What are advantages of 1's complement over 2's complement in DSP? [closed]

I wanted to know about the advantages of 1's complement over 2's complement in DSP applications.
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2answers
164 views

problem with fixed point butterworth implementation

I have designed a 2nd order Butterworth filter with MATLAB fdatool for VHDL implementation. the cuttoff frequency is less than Fs/10, which should be okay since fdatool uses prewarping. Indeed, the ...
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2answers
283 views

Implementation time of Linear Feedback Shift Register (LFSR)

From implementation point of view, how much time will pseudorandom number generation by Linear Feedback Shift Register (LFSR) take when implemented on, for example, Digital Signal Processor? Seed is ...
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1answer
274 views

Pulse Oximeter signal processing

I'm trying to make a pulse oximeter using IR Light,Red Led and a Light to frequency converter with STM32L4 Controller and Timer Input Capture. The wavelength input of both the lights gives a similar ...
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3answers
411 views

Scrambler with all zeros on input

Several communications standards use LFSR-based self-synchronizing (multiplicative) scramblers that are never reset to an initial state after initial power on. For example, 10GBASE-R Ethernet ...
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1answer
1k views

Difference between a Kalman filter and a linear quadratic regulator?

May someone, in simple terms, describe to me the difference between a Kalman filter and a linear quadratic regulator? If possible, please use an analogy or maybe even a visual demonstration of the ...
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2answers
74 views

Can somebody explain discrete time frequency

I am an analog guy learning DSP, and I am a bit confused by discrete time frequency. What units is discrete time frequency k measured in? I have read that k is the index of the frequency and not the ...
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3answers
744 views

How to detect the fundamental frequency of a human singing voice signal

I want to make a digital hardware chip that can input a human voice, (singing simple wordless long notes) and output a square wave that is the same frequency as the fundamental frequency of the voice. ...
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0answers
61 views

dsPIC33EP512GP502 -> ADPCM?

It seems that ADPCM is all but non-existant anymore. But I'd like to use this to compress six high-quality audio channels into a smaller bit-stream with little overhead. There seems to be a dsPIC G....
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3answers
2k views

FSK demodulation using DSP

Especifically talking, I need to demodulate a low frequency FSK signal( betwen 120 and 140 kHz ). I already have a circuit of antenna that receive the signal and I already can sample it, but I still ...
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1answer
90 views

Is it 'normal' to use a DSP's internal timers to generate lower speed clock signals for audio codec sampling?

I'm currently working on a project that features a Blackfin BF592 processor (datasheet). I'm trying to interface this DSP with a stereo audio codec (datasheet). Originally, I assumed that this audio ...
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1answer
312 views

Can Blackfin DSPs boot from 'any type' of SPI external flash?

So I'm working on a project that contains a Blackfin processor, specifically the BF592 datasheet One thing that confuses me is how exactly the boot up process will work. During development, I plan on ...
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2answers
371 views

Designing circuit with a FIR filter with feedback

I am trying to implement a VHDL circuit similar to the one in this image: This Simulink simulation works as expected, but trying to implement the same in VHDL is another issue. The problem is that ...
3
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4answers
237 views

On what condition does Harmonic components of power generated in 50/60 Hz Grid Generators depend on?

I have power-recording data from 11 countries (USA-60Hz mains frequency / other nation 50Hz). These data were collected using a audio recorder (in a computer) connected directly to the power mains via ...
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2answers
178 views

Hardware needs for minimal DVI processing with precise timing requirements

I'm looking to make something I can put between a video/audio source (DVI/DP) and a 240hz monitor that can, with precise timing, replace single frames with a solid color. (the application is around ...
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2answers
5k views

Uniform Linear Array (ULA) beamwidth and angular resolution using FFT

I have a four element uniform linear array receiver and I want to know what will be the angular resolution if I perform perform Fast Fourier Transform (FFT) over antenna elements. As I think that it ...
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2answers
117 views

Number of samples (n) and number of data points (N)

I have a question: I am doing some research on the FFT and had an inquiry. If I have a fixed number of samples per period, what is the effect of increasing my data points, say from 128 to 256? I know ...
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2answers
125 views

Is it 'ok' to use a switched power supply to power a processor core?

I'm currently working on a project which features an Analog Devices Blackfin DSP Digikey link. This DSP requires 1.3V to power the core. I plan on having my project be battery powered, thus I'm ...
2
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3answers
919 views

FFT Using Pic Microcontroller [closed]

Good Evening, I am fairly unfamiliar with DSP and want to engage in a project. I wish to perform a FFT on the source current going into a non-linear load and observe its harmonic content on an LCD. ...
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1answer
104 views

Derivation of discrete-time steady-state and transient response

My discrete-time signals textbook (Oppenheim) jumps through the derivation of steady-state and transient LTI system response to a complex exponential input- $$y[n]=y_{SS}[n]+y_t[n]$$ It says, given ...
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1answer
97 views

DT/CT Domain Signal Periodicity

An interesting thing about a few unique DT signals is that although they may be periodic in the DT domain, they are aperiodic in the CT domain. One example of such a signal is: $$x[n]=\cos\left(\frac\...
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2answers
121 views

How to DSP filter a signal that has a variable time base?

I am measuring frequency on a microcontroller by measuring the time between pulses on an input. DSP filter theory requires the time base of an input signal to be regular, e.g. IIR and FIR filters. ...
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1answer
219 views

Problems with implementation of a band-stop filter on an MCU (dsPIC) using fixed-point arithmetic

I'm trying to implement a band-stop (notch) filter on a microcontroller dsPIC33EP64GS506 to filter out a 100 Hz component from ...
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1answer
38 views

DSP board TMDX5505EZDSP potentiometers and switches

I have to do a project for school that is an audio effects processor but I'm not experienced with dsp. I'm using the Texas Instruments TMDX5505EZDSP. I've programmed some audio effects based on some ...
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1answer
89 views

DT Ramp Signal Summation Notation Help?

I cannot understand how the summation range has changed via substitution of m. EDIT: Full problem with solution (for context):
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2answers
185 views

Convert PID parameters to Q15 format

I have calculated the transfer function of my system to apply a PID to it. With MATLAB and the PID Tuner tool I got the Kp, Ki ...
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2answers
3k views

Aliasing vs Imaging. What is imaging?

In DSP for audio, I understand what Aliasing is (fixed with an anti-aliasing filter), but there is also something called Imaging (fixed with a reconstruction filter). Aliasing is when a higher ...
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1answer
189 views

Feasibility Question - graphic acceleration on CPLD / FPGA …DSP?

I am a programmer new to electronics. I wanted to get a perspective on wether Programmable logic is feasible in allowing a basic math algorithm to be accelerated. Wanting to solve a ray-intersection ...
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1answer
241 views

Need a device to calculate the FFT more than 100 times per second (my scope is maxed out at 10hz)

I'm writing some Python code which retrieves the FFT data that is generated in my Rigol DS1102E oscilloscope via its USB connection. My trouble is that no matter what time scale I set, I get no more ...
9
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3answers
2k views

what really are: Microcontroller (uC), System on Chip (SoC), and Digital Signal Processor (DSP)?

The actual question is at the end. But reading that alone might not show you why am I confused. I wrote this post starting with some definitions, assumptions, and speculations and then asking the ...
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0answers
93 views

FIR Filter delay calculation for cascaded filters

I have created a simulink model which had two filters implemented with an FIR block cascaded in series. The first filter in my case is a moving average filter and the second one a Gaussian filter(...
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1answer
408 views

How to calibrate Unipolar ADC in software

My ADC manufacturer have given the value of following error, value for Avrefm = 0V & AVREFP = 2.7V :-- Zero-scale error Full-scale error Integral linearity error Differential linearity error ...
2
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1answer
465 views

DSP/dsPIC Getting Started

I am a last class eee student and I started to study on digital filters. I want to design a 0-150 Hz band pass filter for getting started(I have not determined certain parameters, I want to do ...
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5answers
342 views

Is curve fitting to a sinusoidal function with Microcontroller possible?

I have 2 sinusoidal waves with a frequency of 2 kHz rectified and being sampled at 50 kHz by two ADC channels (10bit) of a PIC18F26K22. I want to find the measure the amplitude of each sine and the ...
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1answer
940 views

Guitar signal preamplifier - ADC input to STM32F4

This is for a DSP project. I am trying to prepare my guitar signal for as best as possible ADC response in order to detect harmonics to the 5th of the highest note of the guitar (1175 Hz for 22 frets),...
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1answer
75 views

Question about Discrete-Time Signal Frequency

I am running through my old Digital Signal Processing textbook in preparation for a course in DSP, and in the following example from my textbook, I am not sure why: cos((5pi*n)/2 = cos(2*pin + pi(n/2))...
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0answers
266 views

RC filter - compute output as a function of input for generating waveform

I'm not so deeply into the theory about all this, I may use strange terminology... If I put a square wave through a simple lowpass RC filter, the output will be a sort of "rounded sawtooth", well not ...
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3answers
116 views

Does fixed point number processing require ASIC hardware?

I've recently started diving deeper into DSP and have come across the term 'fixed point number'. The idea of a fixed point number is simple enough and makes since to me, however, I'm somewhat curious ...
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1answer
597 views

ADC and DSP Requirements for FMCW Radar

I am building an FMCW radar that has a bandwidth of 1 GHz. The IF frequency is up to 1 MHz. Would the ADC requirements simply be that it has to b 2 times the IF frequency of 1 MHz? If that's the case ...
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2answers
73 views

Stochastic optimal control different in finance and engineering [closed]

What is the different between stochastic optimal control approach in finance and engineering? Why methodes used in finance approach like Ito calculus are not used in engineering?
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1answer
78 views

How do we balance an FIR around its center?

How do we balance an FIR around its center? I was asked this question in an interview. What does this mean? Is the center point the point corresponding to the peak of impulse response?
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2answers
124 views

Magnitude of fourier transform of AM signal

I'm taking a basis course in DSP and in class we had an exercise on amplitude modulating signal. we were given a signal \$x(t)\$ with fourier transform \$X^F (f)\$ with magnitude which looks like this:...
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1answer
337 views

eliminating audio hum

I'm working on a circuit that feeds a microphone into the ADC of the STM32F4 Discovery and then outputs that exact signal out of the microcontroller's DAC and then to a headphone jack. I am able to ...
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3answers
164 views

Sharp and Simple Analog Filter suggestions

I'm looking for schematics of some simple opamp-based analog filter, which has a sharp band-pass functionality. I want it to control small robot with sounds of different pitch. The matter is like ...
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1answer
200 views

FFT Bin Problem with external 24 Bit ADC(FFT bins changing with time)

Currently I am working on one project that includes 24 Bit external MCP3919 and MCP3914 ADCs and Tiva C series 32 Bit MCU. I am trying to calculate harmonic values of input signal. I am using CMSIS ...
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1answer
327 views

how i can get 5V AC output from 230V AC [closed]

how can'i get 5 V AC output 230 V AC: input? for a measurement unit bases on DSP?
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1answer
372 views

Digital filter implementation in C (embedded)

I am a recent grad and my new project at work deals with taking the signal from an electret microphone and getting SPL values for 10 standard frequency bands. The analog amplification/conditioning is ...
2
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1answer
1k views

Comparison between FMCW radar modulation techniques

In designing a Frequency modulated continuous wave (FMCW) radar system for target detection, there is a possibility of choosing the modulation technique amongst triangle or saw-tooth modulation. What ...