Questions tagged [dsp]

DSP stands for Digital Signal Processing or Digital Signal Processor.

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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
190 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
242 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 ...
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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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4answers
1k views

Discrete signals: Power and Energy after Up/Downsampling

I think I have a very simple question, but I am very confused about it right now. Given is a discrete sequence \$x[n]\$, for simplicity we say its finite and of length \$N\$. Then we know that 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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10answers
21k views

When can FPGA's be used and Microcontrollers/DSPs not?

I have to choose between a course on advanced microcontrollers and a course on advanced FPGA's. I have had introductory courses in both subjects, and what troubles me now is that I am already pretty ...
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1answer
414 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 ...
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1answer
470 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
343 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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2answers
931 views

How to configure Coide to use DSP library for STM32f3?

I am struggling to use the DSP library provided by ST for my STM32f3 discovery board. I am using Coide. I started by including arm_math.h since all the DSP library files refer to it. I am getting ...
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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
601 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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1answer
877 views

TMS320 Floating Point (Texas Instruments DSP from '98)

Background Is there anybody here who is an EE with programming experience who has worked with the Texas Instruments TMS320 C3X-series DSP? I am currently doing some work with the C3X for a project. ...
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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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2answers
180 views

DSP applications for Hysterisis [closed]

How is hysteresis used for DSP?
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2answers
730 views

FreeDSP (ADAU1701) isn't working - what is the issue?

I had FreeDSP PCB soldered recently and for the last two days I've been struggling to make it work. FreeDSP basically consists of ADAU1701 DSP, 24LC256 EEPROM, 12 MHz oscillator, IO circuits and ...
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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
335 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
376 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 ...
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3answers
207 views

What is name of process used to change sample bit depth?

Changing sampling rate is called up sampling or down sampling depending on which way or is done. If the factor is an even number then the process becomes very simple. However, what term is used to ...
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1answer
546 views

Flattening microphone's frequency response

It is typical for a microphone to have a non-flat frequency response like so: Is it typical to flatten the response curve by weighting the signal in frequency domain to get the most accurate ...
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1answer
78 views

What are the (mathematical) restrictions of a TMS320C6713 DSP?

I have a function that computes the sum of even numbers in a Fibonacci sequence less than a boundary. Should I be worried about this calculation? Can the TMS320C6713 handle it? When I run the ...
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1answer
63 views

How to lower volume on microphone input before outputting through headphones? (Using a DSP) [closed]

As part of a senior engineering course, my partner and I decided on tackling the problem of hearing loss in youth, and went with a more preventative approach, trying to reduce the amount of cases ...
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2answers
1k views

Given the system function, how can i tell if it is a lowpass or a highpass filter? [duplicate]

If i am given the system function of a FIR digital filter obtained by recursive frequency sampling design procedure., how can i tell if it is a lowpass, highpass, or bandpass filter?
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1answer
150 views

Vacuum tubes versus solid state in specialist audio [closed]

There is obviously a large body of opinion that believes the use of vacuum tube amplifiers enhances some types of music. My question is simple: Given that modern DSP techniques can mimic just about ...
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1answer
178 views

Digital Signal processing-Sampled period

Please can you help me with exam test preparation. I have take the below past year exam paper. I want to know if I am on the correct track and my answers are correct. x(t) = cos(50.pi.t + 30) which ...
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1answer
89 views

Where to find comprehensive motor control learning material? [closed]

I have ARM cortex-M/cortex-A software/hardware development team. My work involves many Linux drivers, BSPs and tuning for ARM hardware. Recently, one of my friend has started BLDC motor ...
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1answer
285 views

How to design the frequency response of an analog filter when I get the transfer function?

I am not trying to design a filter. I just want to understand the theory of laplace transform and s-domain.I read an example from the book The Scientist and Engineer's Guide to Digital Signal ...
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5answers
6k views

VHDL: Using '*' operator when implementing multipliers in design

Present day FPGAs have built in DSP blocks, the latest FPGAs even have built in IEEE-754 compliant floating point units. It is possible to create DSP entity/module using a GUI after selecting the ...
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2answers
2k views

Meaning of phase in Fourier Transform of audio signal

I'm looking at the Fourier Transform (really, at a sliding DFT) to analyze (visually and intuitively) the frequency components of a sound over time. But the DFT produces complex numbers, and I'm not ...
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1answer
484 views

BPSK modulator with DDS on FPGA

I was developing a BPSK modulator with an AD9852. Since AD doesn't seem to offer any way to functionally simulate their DDS ICs, suddenly i see myself in the need to change for a FPGA architecture. I ...
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3answers
3k views

DSPs: Can I perform floating point division in a Xilinx DSP48?

I need to make a implementation of a floating point division using System Generator and I my version of System Generator don´t support the 'divider generator' so I was thinking several options to make ...
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1answer
575 views

Use LCD 1602A with F28027

I want to connect C2000 Piccolo LAUNCHXL-F28027 and LCD 1602A. And I already found this example: http://embedjournal.com/interfacing-16x2-character-lcd-with-c2000-launchpad/. I downloaded the source ...
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1answer
147 views

band pass filter on solar cell to detect laser

my target is detecting a laser generated with 1k frequency using a solar cell, i'm using this idea which is using a band pass filter on the solar cell to block the dc sun light and let me detect the ...
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4answers
906 views

Are FPGAs more intuitive to learn than microprocessors for doing DSP

I want to learn to make DSP hardware I have never done any DSP and only a little bit of programming, but I have been making analog circuits for 15 years. I like the idea of learning FPGAs because it ...
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3answers
2k views

Transmitting data from MATLAB to FPGA

This is about design of a JPEG compression/decompression scheme on an Altera FPGA. It is possible to have camera or SD card for image input and TV or SD card for image output. However, these ...
2
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3answers
476 views

Radar Snr improvement

I have a simple radar module (k-band) that is capable of fm modulation and it provides both I and Q as baseband outputs. I like to extend the measurement range of this module by just signal processing ...
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1answer
141 views

Understanding the DTFT

So I am taking a signal processing course in EE and my professor is an Engineer who really likes math however his book which we use for the class falls in the dreadful purgatory of math books in my ...
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1answer
176 views

Why does frequency equal k/K where k=0,…, K-1 in Discrete Fourier Transform?

I totally can't understand why f = k/K. What does k, K means, respectively?. I really want to know what they actually indicate in real world. Or, please give me an example. I spent 2 days night but ...
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1answer
213 views

Are TI TMS320C6x and TI TMS320C2x compatible?

I never learnt assembly language programming. But, I know C and C++. I need to learn C2000 Piccolo programming. I found no book on C2000, there are only manuals from TI website. But, suddenly, I ...
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1answer
70 views

How many ePWM instances are there in a TMS320C28x Piccolo DSP chip?

In this reference manual, it is written that: [Page 11] 1 Introduction ...... Cross coupling or sharing of resources has been avoided; instead, the ePWM is built up from smaller single channel ...
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3answers
235 views

Cannot understand the attenuation in signal from PC to microcontroller(NI myRIO)

I am working on Active Noise Cancellation Project. I came across a problem, where the signal is getting attenuated as the audio bit depth changes from PC data to Microcontroller and I cannot ...
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2answers
200 views

Capturing a 16.368MHz data stream with a MCU running at 32MHz

I have a 32MHz MCU (Atmel XMEGA A4) and I need to recover a digital signal coming from a GPS front end chip which is outputting SIGN and MAGNITUDE data at 16.368MHz. Clearly this is a hell of a task ...
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1answer
221 views

Combining the outputs of multiple SPI devices

I have a project that has an array of digital microphones whose output I would like to perform some fancy signal processing on, using a high-powered ARM micro-processor. I like the idea of using ...