DSP stands for Digital Signal Processing or Digital Signal Processor.

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2answers
53 views

IIr filter layout to formula problems

I am trying to create the formula for this layout but I have the feeling that I made a mistake. The formula that I have at the moment is: Can someone tell me if this is correct?
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0answers
31 views

Recommended setup for recording and processing 3 or more audio signals

I don't want to ask for specific products but the terminology in general: for a future experimental project I want to record multiple audio signals and I don't know yet which frequencies I'm ...
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1answer
67 views

HDMI microcontroller / DSP tutorial

I know a little bit about microcontrollers. I want to first say this question will be over my head but I'd like to do the project anyway... I want to have a HDMI input, add effects to the sound, then ...
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1answer
56 views

Can I connect an ADC directly to a DAC?

I'm planning to do some audio DSP soon but I would like to know if I can connect an ADC directly to a DAC without a processor in the chain. My main reason is to test preamp circuitry. I would like ...
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1answer
39 views

Poor man's equalizer with a few digital bandpass filters - how to overlap band edges

I am trying to implement an equalizer in an FPGA. It's not hifi or anything so 3 or 4 bands should cut it. So I have a low, band, and high pass filter covering the entire voice spectrum (0-4kHz in ...
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0answers
77 views

PIC32: How to use DSP Library?

I am using a Microstick II Board with the included PIC32MX250F128B and I would like to perform real-time audio processing. I use an analog input to get the input sound and a PWM output, in combination ...
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1answer
57 views

How many periods of a periodic signal are required to properly determine magnitude?

I have a pure sinusoidal test function. I am trying to determine the magnitude of the response through my circuit very soon after powering up with circuit. If I am using a 1kHz test signal, I only ...
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2answers
147 views

STM32F4 - Digital Signal Processing ( DSP )

At this website, I have read that STM32F4 microcontrollers have DSP instructions. To quote: It also implements a full set of DSP instructions I am beginning to learn embedded C programming with ...
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0answers
36 views

How to prove sampling is energy preserving using Parseval's Relation?

I have a continuous signal, xc(t) which is bandlimited to =pi/T, and x[n] = xc(nT) are samples of this signal. I need to show there is a Parseval's relation between the original signal and the sampled ...
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1answer
55 views

Barker code autocorrelation

How do you auto correlate the following Barker code? I tried to use the formula on Wikipedia's page but it did not make sense to me. +1, +1, -1, +1
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1answer
52 views

FFT of first N samples of signal? [closed]

Suppose if their are M samples in x(t) out of which I compute FFT of only first N samples of x(t), then the computed X[k] does this represent frequency component of first N samples or what I am doing ...
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0answers
77 views

DSP board for non-standard video output? [closed]

I've got a project that requires outputting three arbitrary video signals at video rates. The idea is that two of them represent the x and y axes of a raster scan, and the third carries monochrome ...
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2answers
81 views

Band-pass filter confusion

I'm having trouble understanding the concept of a Band-pass filter. Not, that I have the following signal (in the frequency domain): What I essentially need to do is remove the noise and only ...
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8answers
1k 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 ...
7
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3answers
233 views

What can the dsPIC do which the humble PIC microcontroller cannot do?

I have not used a DSP chip as of yet. All I know is that their architecture is such that they can carry out calculations quite fast, usually within a clock cycle, they have multiply-accumulate ...
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1answer
88 views

Convert (-4 to 4v) from sensor to 0-3.3v [duplicate]

Can you show me how can I make a schematic to convert signal voltage from sensor to ADC module of DSP. Sensor : -4 to 4 voltage DSP ADC: 0 to 3.3 voltage. Thank you,
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0answers
52 views

Measurement of frequency domain ripple of a filter

I am trying to analyze the passband ripple of various filter designs. I would like to know the correct way to measure the ripple. The trivial answer is to find the min and max amplitude in the ...
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1answer
111 views

Is there a way to build a software defined radio using the PC's DSP chip? [closed]

I'm looking to build a radio controller for a few DIY robots and was wondering if anyone knew of a way to utilize the onboard DSP in PC's as a SDR. The reasoning for this direction is I remember ...
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1answer
92 views

Digital Filtering [closed]

Lets say I have an audio signal and want to filter out anything below 100 Hertz. At first, I would think of a high-pass filter. A simple capacitor could do the job, but there are going to still be ...
2
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1answer
61 views

Z-Transform Initial Value Theorem

I have a small understanding of how to solve limits to infinity for regular rational equations, but I'm unsure of how to apply this to the Z-Transform initial value theorem. The equation is: \$ ...
2
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2answers
168 views

Dedicated digital filter

I have built a DDS (0-80MHz) with an FPGA (XC3S400) that I can program it for making almost any wave form (limited frequency by the wave form complexity). After weeks of struggling with making a ...
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0answers
88 views

Learning Curve For Microcontroller Programming & Anlog/Digital Electronics? [closed]

What is learning curve for embedded developer in which you can learn with doing small projects? I'm working in a power electronics firm. Our product portfolio is Inverters/Converters, Chargers, AC/DC ...
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1answer
142 views

How can I high pass (DSP) filter a low frequency signal without introducing lag?

I need to high pass filter a signal, and my design just isn't cutting it. The part that's making it tricky is that I can't tolerate lag. I am sampling at 20Hz, the signal I care about is 1/12 to ...
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1answer
100 views

What limits system clock in MCU? How high can I go?

I'd like to produce PWM outputs at f_PWM ~= 100kHz and I'd like to connect the ADC to sample at least once during each high-time interval of the PWM output. Everything in my configuration of these ...
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0answers
100 views

Fast (20MSPS) sampling to CPU (via MCU?)

What is the "state of the art" w.r.t. interfacing high speed A/D and D/A to CPUs? Our current system consists of a dedicated board with a PCI interface, containing a TMS320C64x DSP, which talks to 2 ...
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0answers
89 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
636 views

What actually is a shadow register?

I noticed the term Shadow Register while going through a datasheet of a TMS320F28335 DSP. What does it actually mean? Does it have a physical location in the CPU as ...
2
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1answer
118 views

How to take z-transform of a function with an absolute exponent value?

Can you help me find the z-transform of the impulse response below: $$h(n) = (\frac{1}{2})^{|n-1|} + (\frac{1}{2})^{|n|} $$ I know the z-transform of $$(\frac{1}{2})^{n}$$ is equal to: ...
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1answer
62 views

What to look for in a processor for a DSP project

I am working on a Digital Signal Processing application and I am a little lost in all the information included with giant processors that are labeled as Digital Signal Processors. I started ...
3
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1answer
108 views

Generating 48kHz clock for DSP

I'm working on a Microblaze-based system. I'm using FSL to shuttle data directly from an AC'97 controller core to my custom DSP core. The FSL buses are clocked at the 125MHz system clock. The DSP ...
6
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1answer
408 views

How to select frequency resolution and window size in FFT?

I am doing spectrum analysis of a time varying signal with frequency changing from 200Hz to 10kHz. I am using the FFT for analyzing the frequency component in the signal. My questions are: How to ...
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1answer
326 views

Xilinx DSP48 Single Slice 18x18 Complex multiplier

I am writing a verilog code for 18x18 complex multiplier using DSP48 single slice implementation in Vertex 4. Here is my code ...
2
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1answer
103 views

Can't write more than one byte to the SST39SF010A Flash!

I use code composer to program the TMS320C31 DSP (through MPSD) to write to the SST39SF010A flash. I can successfully write one byte to any location of the flash by following the "Chip Erase" then ...
3
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2answers
322 views

What is the expression for an oversampled signal?

Problem: A simplified schematic of an oversampling circuit is shown below. A data sequence, \$x[n]\$, is transmitted by REG1 which is in clock domain \$C_{tx}\$. \$x[n]\$ is oversampled by REG2 in the ...
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2answers
106 views

Resistance between data/Addr pins and GND ranges from 1k to 1M, is this normal?

After soldering a 132-pin surface mount DSP, I checked if there are short circuits or not using "GreenLee DM-110" multimeter. I found that the resistance between data or address pins and GND ranges ...
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0answers
54 views

Imge processing with dsp board

I am trying to run a simulink model file in TMS320C6416dsk board using RTDX(Real time data exchange). The corresponding C code is generated in the code composer studio3.1 and the .out file is ...
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2answers
237 views

Doing FFT of electroencephalogram signal at 200Hz - what window size to use?

I got a brainwave EEG(ElectroEncephaloGram) sensor that is continuously sending data over to my program at about 200 data points per second. Can someone suggest what window/bin size I should be using ...
2
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0answers
218 views

How calculate three phase kilowatt hour from time sampled data of voltage and current of each phase

My problem is I want to calculate three phase kilo watt hour from time sampled data of current and voltages. My doubts 1) How can I calculate the kilowatt hour from time sampled data? Is it any ...
2
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1answer
161 views

Do I need a RTOS?

My hardware would have a DSP with the following characteristics: Sound generation (internal parameter will generate pure tones, white noise, filtered white noise or the sum of them). I2C ...
5
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3answers
540 views

What are the origins of the window functions in DSP? Why not just use a rectangular window?

As far as I know, in DSP we wish to remove or reduce the effect of some undesired signals by separating its frequency spectrum from the spectrum of the whole signal (our main signal and the noise). ...
3
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4answers
506 views

Microcontroller suggestion

I'm designing an analog audio amp with a 6 band analog equalizer controlled via a 7" LCD touch screen. I'm wanting to preform a real time 2048 point FFT and display it on the screen in some kind of ...
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1answer
1k views

Fundamental period of a discrete-time signal

This question comes right out of the problems section of Oppenheim's Signals & Systems 2ed textbook. I don't understand the solution to the problem. (problem #1.35) If a discrete-time complex ...
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2answers
419 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} = ...
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1answer
592 views

DSP with ADC DAC SPDIF IO controlled with Microcontroller via USB

I'm looking for a board to process live music (sub-millisecond latency if possible). I'm thinking of a layout like the following: So there are a few DACs and ADCs, S/PDIF inputs and outputs and a ...
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2answers
120 views

DSP for single-precision control signal generation

At present I am frustrated by the limitations of fixed-point arithmetic on a microcontroller for a quadrotor aircraft. The aircraft I am experimenting with is using an ATMEGA. I got to thinking, would ...
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1answer
72 views

Voice playback IC

I was looking for cost effective voice playback IC and came up to ISD 1700 series. Another brief datasheet is here. I don't believe with the same footprint and only for 3-4 bucks I can get up to 16 ...
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3answers
251 views

Reduce and clip voltage of a 5Mhz ultrasonic signal from +-50V to 0-3.3 V

I know there are a lot of posts similar to this one but some differences make it worth posting it. I’m working on a project where I have a 5MHz AC signal with the largest amplitude of +-50V. It’s an ...
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2answers
418 views

Looking for an SOC with ARM, DSP and GPU

In past I have used TI DaVinci Chips having an ARM core and a DSP. I am now looking for a chip having a GPU along with ARM and DSP. I know ARM Mali has a GPU core. But is there any chip available ...
1
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1answer
142 views

networking platform to meet the IEC61850 sampled value requirements

I've developed a linux based simulator of the IEC 61850 sampled value publisher, even with RT linux I still can't meet the requirement to publish a message with MTU =-1500, every 1uS on a PC platform. ...
3
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1answer
133 views

Memory interface for video output

I am designing a system where a DSP (like the TMS320VC5501) processes some video data and outputs it to a PSP screen (the ones sold on sparkfun). The issue I'm having here is designing the video ...