DSP stands for Digital Signal Processing or Digital Signal Processor.

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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 ...
2
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0answers
80 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 ...
5
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1answer
166 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
57 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
71 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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0answers
45 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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0answers
40 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
31 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
70 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
55 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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1answer
51 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. ...
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5answers
128 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
48 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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1answer
78 views

what hardware is more suitable for a project measuring power constantly and keeping it on minimum ? Microcontroller, DSP, FPGA, FPAA, which one? [closed]

I have been looking for a hardware to implement a controller for over a month, but I can't reach a decision. I want to implement a controller, which constantly measures power and keeps it in minimum ...
0
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0answers
55 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
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1answer
193 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
79 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
81 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 ...
4
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4answers
223 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
98 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 ...
3
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4answers
192 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 ...
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0answers
58 views

Alternative of VisualDSP++ available for OSX?

Im wondering if there is anything like VisualDSP++ is available for OSX (searched the Googles, found nothing). I need to program a Analog Devices microchip for a school project. And I'm wondering if ...
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1answer
282 views

TIVA C series launchpads for arduino programmers

I have bought a Tiva C series Launchpad TM4C1294NCPDT by TI and wish to do a project on face recognition. I will soon get a DSP EVM by TI, but still confused which one to choose (MAY be the one with ...
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1answer
76 views

DSP - practical even or odd functions

Signals can be classified as even, odd, or a neither - in which case they can be broken up into their even and odd components. Theoretically its all very nice to be able to say that yes that function ...
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0answers
63 views

Analytical design of bandpass filter: MATLAB function documentation

I am trying to "design" a blackbox bandpass filter (butterworth or chebyshev) based on parameters such as \$f_{min}\$, \$f_{max}\$, bandwidth(BW)/Q-factor, and etc, using Visual Basic. However I am ...
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2answers
97 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 ...
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4answers
100 views

Image processing hardware options

My imaging system currently produces a stream of digitized video data at 10Msps. That is, parallel 12bit ADC output at 10MHz. The next step is to collect the data in 1024*1024 chunks and perform image ...
2
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1answer
78 views

Integrated audio DSP with free tools?

(Intro here, you can skip this for the actual question) As a hobby project I'm building an audio amplifier. It'll be the amp for my "home theater". I only have a small room so there's no room for 5.1 ...
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2answers
89 views

The meaning of Cross and Auto Correlation Matrices

I have to make some system where I have an input signal (i) and and feedback signal (f) and from this I create a autocorrelation Matrix (ACM) where ACM = i*i and cross-correlation vector (XCV) where ...
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2answers
80 views

Cascading Low Pass Filter Parameters

I'm trying to implement two cascaded low pass filters in a software application so that I can smooth out a potentially volatile data set. Based on the incoming data, I want a signal to be turned ...
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2answers
170 views

What is limp mode in PLL?

What does limp mode mean in this sentence below? Make sure the PLL is not running in limp mode.
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2answers
111 views

Signal power and perceived volume

With a couple of friends I am designing a synthesizer on an altera FPGA (cyclone II, the one on the DE2 board). We almost wrapped it up nicely but there's a problem that bugs us. The synth can ...
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1answer
114 views

Transfering audio data between two DSP's, clock sync problem

I have a system with two DSP modules. The audio is routed from DSP1 to DSP2 and then back to DSP1, which in turn immediately sends it to DAC. It's a high-quality stereo sound at 44.1KHz. This is a ...
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1answer
58 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
122 views

Is this DSP sinewave inverter a marketing hype?

There are some companies in my country(India) which try to sell inverters for home marketing in the name of DSP Sinewave Inverter and claim are superior to normal sinewave inverters. I am trying to ...
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2answers
78 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
45 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
195 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
103 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 ...
0
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1answer
78 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 ...
3
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1answer
605 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 ...
2
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1answer
68 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
1k 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
42 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 ...
2
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1answer
277 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
66 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
85 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
112 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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9answers
5k 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 ...
7
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3answers
692 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 ...