Questions tagged [dsp]

DSP stands for Digital Signal Processing or Digital Signal Processor.

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28
votes
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 ...
0
votes
2answers
3k views

How to know the kind of filter from the transfer function [closed]

I got that system \$x_n \to x_n-x_{n-1}\$, so \$h_n=[.....,0,1,-1,0,...]\$, with \$h_0=1\$ and \$h_1=-1\$, so the transfer function given by: $$H(\omega)=\sum_{i=-\infty}^{\infty} h_ne^{-jwn} = h_0e^{...
1
vote
3answers
7k views

Frequency Detection Circuit Design

I want to create a circuit that can detect audio frequencies and flash RGB LEDs different colors depending on the detected frequency. The frequency range will be from 20 Hz to 12 kHz, after looking at ...
84
votes
6answers
47k views

What is the difference between a DSP and a standard microcontroller?

I understand that a DSP is optimized for digital signal processing, but I'm not sure how that impacts to the task of choosing an IC. Almost everything I do with a microcontroller involves the ...
18
votes
9answers
6k views

DSP recommendation for beginners [closed]

I am considering a project involving a fair share of digital signal processing. As far as I know, the best type of IC suited for this are the Digital Signal Processors. I have never worked with them ...
3
votes
4answers
1k views

How to select ADC resolution, considering input signal SNR and digital signal processing?

What I knew: The ADC resolution selection depends on the ADC inherent noise and input signal SNR. Our application: Very high precision measurement of signals ranging 1kHz to 10kHz. We want to get as ...
66
votes
6answers
179k views

What is the relation between FFT length and frequency resolution?

If I have sampled a signal using proper sampling methods (Nyquist, filtering, etc) how do I relate the length of my FFT to the resulting frequency resolution I can obtain? Like if I have a 2,000 Hz ...
18
votes
8answers
6k views

Writing DSP algorithms directly in C or assembly? [closed]

I m working on a DSP project(IIR filtering) on an Analog Devices digital signal processor(BF706) with the compiler suite coming with it, CrossCore Studio. It has some examples for simple DSP stuff ...
10
votes
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 ...
5
votes
4answers
10k views

Avoiding echo/feedback on speaker-phones, how?

Even a $20 mobile phone with a speakerphone has no problems of feedback. While I understand that companies like Mediatek have use crazy volumes to bring down mobile chipset prices so low, but reading ...
8
votes
3answers
6k views

What's so great about PPC? There's gotta be something

With this question in mind (the first one that stackexchange is offering me right now among the "Questions with similar titles"), I'd like to steal the idea of the question and ask it about PPC. What'...
9
votes
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 ...
5
votes
2answers
330 views

Selecting a platform for DSP

I have experience with selecting low end PICs, but haven't had to select a controller for DSP before. Initially I thought about the dsPIC line, but the only reason for this because I am comfortable ...
3
votes
2answers
629 views

Efficient spike detecting Microprocessor or DSP architecture

I am looking for microcontroller or DSP (or its architectures) which are efficient in terms of power as well as performance in detecting spikes. I want to run an algorithm which detects spikes and ...
1
vote
2answers
2k views

Looking for OP-Amp with good rail to rail performance, 5V to 0V [closed]

There are thousands of OP-Amps on Farnell's website, so I thought asking the stack-exchange community might be a good idea. I am looking for an OP-Amp for use in my project. I currently have an OP-...
7
votes
2answers
8k views

Why does rectification of a digital signal double the frequency content?

I'm performing envelope detection in the digital domain. This consists of rectifying the signal (i.e. taking the absolute value) and low pass filtering it to extract the slower varying envelope signal....
6
votes
3answers
377 views

Digital signal controller with GNU toolchain?

Does any manufacturer offer a digital signal controller (which basically means a microcontroller with some DSP functionality like a MAC instruction and other stuff) to which I could compile software ...
4
votes
1answer
926 views

How to use an audio codec as an ADC?

I would like to add ADC functionality to a TI C6748 dev board. I need 16bit precision, but relatively low sample rate(~5K). Not finding any suitable daughter ADC card, I am considering the ...
2
votes
1answer
3k views

Programming methods for detecting liquid drops with phototransistor

I have a simple circuit with an LED pointing at a phototransistor. There is a tube in between them that drops of liquid will drip through at random times. I am reading the voltage with an Arduino at ...
2
votes
1answer
521 views

How do you get a program onto an eZdsp board?

I'm using an eZdsp board which has a TMS320f2812 chip on it. The board has a parallel port on it which is used to program it. I'm experienced with software but not at using microcontrollers or DSPs ...
1
vote
3answers
102 views

Low frequency present on sampled waveform

I am trying to sample a 50kHz sinewave @ 200 ksps using a 16-bit ADS8517 ADC. I am having a problem in that there is a lower frequency signal present on my input signal as shown: I have scoped the ...
0
votes
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 ...