DSP stands for Digital Signal Processing or Digital Signal Processor.

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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) = ...
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0answers
15 views

Filter to detect an enduring step in RF level

I'm working on a digital radio which operates in half-duplex. This uses a chipset that gives a signal strength indication (RSSI), and indicates when it detects the beginning of a digital transmission ...
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0answers
35 views

Need help with getting 95% ellipse area of 2D PSR plot [closed]

So I have been referring to the method of obtaining this as outlined in this paper (pg 4 - 5). I have implemented the following matlab code to obtain it: ...
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1answer
34 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 ...
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2answers
258 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
69 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
35 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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56 views

How do I decide upon the order of SINC filter for sigma delta modulator?

I have simulated a first order sigma delta modulator im Matlab simulink. The clock frequency of the modulator is 20Mhz (oversampling frequency). Now I am trying to convert a sine waveform (50Hz) to ...
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18 views

dsp kits having built-in aes-256 libraries?

i want to ask that is there any dsp kit that has built-in aes-256 library in it? actually, i'm working on a project in which i've alot of other things to do as well and encryption also. so, i was ...
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0answers
53 views

USB streaming controller

I am developing an Audio codec using the TIs AIC3254 chip. For the interface, they have suggested a USB streaming controller which they no longer support and other alternatives are a full blown Audio ...
3
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6answers
389 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
43 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
117 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 ...
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0answers
43 views

Where to get started? Digital Lockin Amplifier

Being an experienced embedded programmer/designer (AVR, PIC, ARM), I want to design a digital lockin amplifier. I know that I need a DSP for this and I see many people using the Xilinx Spartan6 ...
4
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2answers
238 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
209 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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0answers
27 views

Simulating noise in a digital signal

I'm trying to simulate a POTS line, and I have a reasonable set of digital filter coefficients sorted out. However, I'm a bit rusty on how I'd add a fixed amount of noise to match a given "SNR" of, ...
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2answers
64 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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1answer
32 views

ASP solution for sound enhancement [closed]

I built a stereo speaker and to an extent it sounds good. But I noticed, by changing the EQ to "Rock" genre in my MP3 player, the instrument clarity became more clear and vocals were more fuller, ...
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2answers
194 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
64 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
112 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
33 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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0answers
141 views

Connecting RGB LED light strip to LP3950 color LED driver

I want create color organ controller for use with 12V-24V RGB LED light strip. The LED light color changes need be synchronized to audio signal with both amplitude (beat) and frequency methods (4 ...
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1answer
33 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
96 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 ...
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1answer
159 views

Low Pass IIR filter attenuating all frequencies

I am trying to make a Low pass IIR filter in dsPIC(dsPIC33FJ12MC202) using mikroC compiler. I have generated filter coefficients using Filter Design Tool. My filter specifications are as follows: LPF, ...
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94 views

Mueller Muller CDR

For a clock data recovery in a reciever a phase detector is used. In my case I want to understand how the Mueller Muller CDR works. And also what its advantages and disadvantages are. The ...
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2answers
85 views

how to determine the probability the two signals are equivalent

I am new to electronic engineering and DSP. I have this orignal signal matrix [X1,Y1] . . . . [Xn,Yn] and then it goes through series of transformation. It can be rotation/shift_bit/or whatever ...
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0answers
55 views

RMS calculation of signal with high crest factor up to 10 MHz

I'm attempting to measure the RMS of an AC signal with a crest factor of up to 10, at frequencies of up to 10 MHz. From my brief research I can see many ICs that work well above 100 MHz (designed for ...
1
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1answer
141 views

frequency doubler on fpga

is it in general possible to implement a frequency doubler completely on FPGA? I saw some implementations on google by delaying the input and XORing it with the original. But they also say that this ...
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3answers
359 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 ...
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0answers
93 views

Best Approach Methods for Signal Processing

I'm looking for some advice, I am hoping one of the many forum experts could help me with some advice on the sampling and processing of signals. I am using an STM32F4 processor with 12 bit ADC and DSP ...
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1answer
520 views

FFT Beat Detection Circuit

I have for over a year now tried to figure out both the electronic aspect and the software aspect of my project. I have somewhat successfully managed to make the overall idea to work, the bumps I ...
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1answer
205 views

Sigma Studio, booting DSP in assembly.

I am currently working with ADAU 1772 Audio Codec. Since the Evaluation Board from Analog Devices is rather expensive for me, I decided to create my own programmer using FPGA. I am trying to boot DSP ...
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1answer
96 views

Check for change in input

I have a problem checking for the change in input, that is when A changes value x changes state. where a is an N-bit input and "x" is a single bit out
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51 views

IIR implementation of \$cos(wo \cdot n^2)\$

For implementing the cosine function, \$x(n)= cos(n \cdot wo)\$, using IIR approach, \$ y(n)=2y(n-1)cos(wo)-y(n)\$ is used. But for implementing the same cosine function for \$cos((n^2)*wo)\$, the ...
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49 views

Estimate the channel inpulse response on receiver using low autocorelation PN sequence

I have a transmitter the channel and the receiver. The receiver must estimate the channel impulse response. The channel impulse response is $$h(n)= Δ(n-0)+Δ(n-3)+Δ(n-50)+Δ(n-93)$$ $$n=0..99$$ I ...
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1answer
55 views

Sampling: how to determine a “good” sampling rate based on a given filter

I assume that the sampling rate is w_s = 2w_max if we have an ideal low-pass filter that nulls frequencies whose absolute value is higher than that of w_max. Therefore, that the only reason for ...
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2answers
220 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
148 views

How to program DSP inside ADAU1772 codec?

I have read ADAU1772 audio codec datasheet but there is no information about internal DSP's instruction set and how to program it. There is a guide for evaluation board with ADAU1772 but I do not have ...
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2answers
112 views

IF signal amplify without delay

I have a RF Frontend that has an 4 IF signal output (2 I channel and 2 Q channel from 2 receiving anettans). Each channel of the IF has a signal rangining from 1.5V to 3.5V with a DC offset of 2.5V. ...
3
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5answers
187 views

Why do we need transforms (Fourier, Laplace, Z and wavelet etc.) for a signal to analyse?

Why do we need transforms (Fourier, Laplace, Z and wavelet etc.) for a signal to analyse? Is it necessary for practical calculations and analysis?
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2answers
52 views

Finding a DTFT of a signal

I'm trying to figure out what's the DTFT of \$ (-1)^nx[n]\$. (I'm given the DTFT of \$x[n]\$) So I tried this, but I can't figure out how to proceed from here, if this is even correct. Any help and ...
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0answers
75 views

How does a chipset determine which LTE bands it supports?

Take the snapdragon 800 and 801 chipsets. Both use the same hexagon DSP http://pages.cs.wisc.edu/~danav/pubs/qcom/hexagon_hotchips2013.pdf But a phone on verizon will only support LTE bands 4 and ...
7
votes
1answer
321 views

Is it possible to create an IIR filter in an FPGA that's clocked at the sample frequency?

This question is about implementing a IIR filter in a FPGA with DSP slices, with very specific criteria. Lets say you're making a filter with no forward taps and only 1 reverse tap, with this ...
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0answers
223 views

Is there a free HE-AAC decoder suitable for ARM MCUs?

Question itself: Is there a free (of charge, but if it's also open source that's even better) audio decoder for HE-AAC (AAC with SBR) that can use the FPU and/or DSP instructions in an STM32F4 ...
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3answers
94 views

How to stretch high frequency digital signals (e.g., MIDI) into the audio range

I'm curious about the possibility of sonifying MIDI data, which has a bitrate of 31250. The range of human hearing extends to about 20kHz, which means that the fastest bits of the signal would lie ...
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4answers
702 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 ...
3
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2answers
119 views

Lack of bass with higher sampling rates

I'm trying the ADAU1701 (from Analog Devices) with an external SPDIF receiver (TI's DIX9211). I've noticed that if I change the sampling rate, the amount of bass at my device's output changes. The ...