Questions tagged [dsp]

DSP stands for Digital Signal Processing or Digital Signal Processor.

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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
543 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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2answers
177 views

DSP applications for Hysterisis [closed]

How is hysteresis used for DSP?
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3answers
326 views

Audio DSP for hobbyists

I'm several years away from finishing an EE degree and have yet to get any exposure to DSP. The few texts I've cracked open pre-suppose a level of sophistication i'm not at yet. Is there some stepping ...
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2answers
723 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
77 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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2answers
662 views

How to improve my digital filter to extract DC from noises?

Digital filter description: The filter's input are sensor data and output will be provided to a PID controller. Sampling rate: 64kHz Noises spectrum: from DC to 10kHz Filter target: to get DC ...
7
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1answer
865 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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1answer
148 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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4answers
3k views

Different ways of using DSP slices in Spartan 6 FPGA

I am reading the Spartan 6 DSP slice user guide, and I need to use the DSP slice in a project of mine. I stumbled upon this question, which basically suggests 3 ways of using the DSP slices ...
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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
282 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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1answer
483 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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1answer
146 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
901 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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1answer
572 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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3answers
472 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 ...
3
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1answer
140 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
210 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 ...
4
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1answer
324 views

256-point FFT, but only need 5-6 frequencies, is there a better way?

Due to the constraints of my system, I have a 256pt FFT. However, I only care about the energy at 5 or 6 of the 256 bins. 256pt FFT is still faster than 5 or 6 specific DFTs, but it seems wasteful ...
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2answers
736 views

What is the meaning of my fourier transform results?

I've been experimenting with Fourier transforms, and I'd like to understand some of the results I'm seeing. I've written a simulator which generates a data stream of length 1/120 seconds, sampled at ...
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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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1answer
348 views

Jumping from microcontroller to DSPs

I have been using microcontroller like ARM Cortex M4 32bit based microcontrollers. Now I am thinking to move towards DSPs, but I really don't know how things work in Processors and DSPs, I mean in ...
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1answer
389 views

Digital guitar effect / DSP [closed]

I have to design and create a MCU device as a project for my university. I would like to create a real-time digital guitar effect, which should have a decent sound quality. I don't have any real ...
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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 ...
3
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1answer
220 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 ...
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1answer
83 views

Sampling frequency range of an discrete signal

Is it possible to detect each and every frequency above the nyquist frequency? Or this can be also discrete Thank you.
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1answer
147 views

Can I implement a FM Radio Rx on the the Spartan 3E kit?

Can I implement a FM Radio Rx on the the Spartan 3E kit? Starting Problems I am facing- How do I interface the Antenna with the Spartan 3E kit? Implementing the A/D converter.
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1answer
238 views

Distinguishing between FIR and IIR filters from transform function

I was good at this but unfortunately I have forgot almost everything... So the question is what are the steps to tell if a transform function is for IIR or FIR filter: $$H(z) = \frac{z^3+5z^2+3z+1}{...
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1answer
71 views

TSP65070 and OMAP 1V8 pull up to 2.7V

I want to use the TPS65070, the power solution for DSP to power the OMAP L138, but i read in the errata sheet of the OMAP L138 OMAP L138 Errata page 25 that the 1V8 power supply can pull up to 2.7V ...
2
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2answers
388 views

Is there an audio amplifier chip or circuit that amplifies certain amplitudes in a signal less or more than other amplitudes?

Like for instance, that would amplify on an exponential curve where the lower amplitudes get the maximum amplification and the highest amplitudes would get no amplification? Is there an analog chip ...
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3answers
3k views

DSP Cutoff vs Sampling frequency question on low pass filter

Is it unrealistic to have a 125 MHz sampling rate with a cutoff frequency of 5 Hz? I downloaded a few filter programs and used their methods and it seems that even with thousands of taps it still ...
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1answer
121 views

analog signal in sample and hold circuit [closed]

if an analogue signal is sampled at a rate of 11.025 kHz and the acquisition time of the sampler is 10 micro sec .how much time is available for quantization and digitization?
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6answers
3k views

16-bit or 24-bit converters?

I wanna build some DSP effects on, for example STM32F4 processor, with frequency 96 or 192 KHz. Are 16-bit converters (ADC and DAC) enough for that kind of operation? Can I hear a diffrence when ...
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1answer
54 views

Mapping signal dynamic range

I would like to transform a signal that has fluctuations between 1.8-1.9V (for example) to be in the range of -1V to 1V. Essentially, run it through a linear transformation [ \$y'= (y-a) \cdot b\$ ] ...
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1answer
2k views

getting started fpga video processing? [closed]

Hi i am a electrical engineering student first year since we study only microcontrollers and processors I have decided to learn more about fpga (I have a little experience with spartan 3e vhdl) . My ...
5
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2answers
2k views

Low-end DSP vs High-end MCU

I'm currently working on a Guitar DSP project, based on STM32F407VGT6 but as I progress I come to conclusion that I'm gonna need a bigger unit (with SDRAM). The question that is ringing in my head is ...
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1answer
1k views

How to interface PWM output from a microcontroller with power MOSFET?

How to interface PWM output from a dsPIC30F6012 microcontroller with power MOSFET TrenchFET like SiE818DF? I want use PWM to control the brightness of the LEDs. Four PWM channels, one PWM per channel. ...
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2answers
177 views

Suggestions for a simple microcontroller [closed]

Please suggest a simple digital solution for an equalizer implementation. I am not looking for any feature heavy DSP based IC, since my application only requires some minor adjustments on the bass and ...
1
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2answers
862 views

What is the relation between delay of a digital FIR filter and step response of it?

My question is indicated in the title: What is the relation between delay of a digital FIR filter and step response of it? Is the delay equal to the stablization time of the step response of the FIR?
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1answer
309 views

What is the best practice to measure 3 phase grid voltage using a dsp chip for synchronization?

I want to measure the current grid voltage to synchronize a dc power supply with the grid using an inverter. Now I'm particularly interested in finding noise and harmonic information about the grid ...
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2answers
1k views

Would oversampling reduce in-band signal noise floor?

I understand that oversampling will reduce quantization noise floor. Would oversampling also reduce the noise floor of the noises in band of interest? *******EDIT 20150320********* The correct ...
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1answer
73 views

how to calculate Hermitian Toeplitz system of equations on fpga in vhdl

I'm trying to write vhdl code to solve the Hermitian Toeplitz system of equations (solving for the A's). ...
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1answer
55 views

Plotting phase of frequency response

I have a question on part A) iii Here is what I have so far What I know is to get the overall phase you have to add the phases of the two frequency response H1 and H2, but I don't know how to get ...
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1answer
792 views

Help understanding 60 Hz low pass filter behavior in oscilloscope

I have been testing this circuit in simulation which is supposed to be a low pass 60Hz filter, as far as i am concerned the simulation works as intended in simulation starts filtering frequencies ...