Questions tagged [dsp]

DSP stands for Digital Signal Processing or Digital Signal Processor.

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2answers
1k views

Image capture and analysis

I am working on a project to make a circuit for machine vision project. Basically, the circuit needs to take a picture (320×240), search for some features, and then give a command based on the ...
3
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3answers
5k views

Looking for a microcontroller for Audio DSP applications

I'm currently researching a system that has the ability to playback multiple sound files from an SD-card, add them together then output the signal to a DAC. I'm basically looking for specifications on ...
2
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1answer
440 views

Should I use pull up resistors in this configuration?

I am interfacing a 3.3V FPGA to a 5V DSP. I am using this bidirectional voltage transceiver: http://www.nxp.com/documents/data_sheet/GTL2000.pdf In the diagram in page 4 they're using pull up ...
1
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1answer
1k views

Generating C code from a Matlab-Simulink model for DSP C6748

I'm trying to generate C code from a Matlab-Simulink simple model (eg.: sine wave generator with a DAC at the output). This code must be executed with Code Composer Studio for TMS320C6748 DSP (Texas ...
3
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5answers
7k views

How to compare two audio files?

I have two recorded audio voice WAV files I have recorded by saying "Good Morning" twice. I want to compare the two audio files and say both are identical. How can I do that? What is the right ...
0
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1answer
185 views

In designing a digital filter by impulse invariance method why is the scaling factor irrelevant?

I've come across a few examples that the scaling factor T in the eqn below can be arbitrarily chosen as unity. How is that possible? doesn't T have something to do with the Nyquist sampling rate? \$H(...
0
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2answers
2k views

Time domain to frequency domain

Im confused about signals. I can absorb time domain but not frequency domain. How does one converts a time domain signal into frequency domain signal by just looking and analyze(without using math ...
1
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2answers
469 views

Periodic graph in frequency domain

Why is that the frequency domain has the same shape all through out? Look at figure b
2
votes
1answer
828 views

Making a toy DSP processor

When I was trying to learn computer architecture the thing that helped me the most was making a toy 4-bit processor (through gate level design of every single thing). Now I want to learn about DSP ...
2
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2answers
2k views

How to solve Bus Contention problem in my case?

The following image describes the problem: Processor 1 has no RS232 channel, but has an SPI one, so we used a UART driver and a level translator ICs. The two processors are on separate boards, and ...
7
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3answers
4k views

Why does radar processing always require FIR filters?

Digital signal processing in radar applications is usually done using finite impulse response filters. Why is that the case? Wouldn't the use of an infinite impulse response filtering be much faster ...
13
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2answers
3k views

What's the sharpest frequency response for a non-causal low-pass filter whose step response doesn't overshoot?

Butterworth, Bessel, Chebychev, and sinc low-pass filters are used in various cases where there are different tradeoffs between having a uniformly-decreasing frequency response, a uniform phase ...
1
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1answer
2k views

Generating C code from a Matlab-Simulink: errors encountered during linking

I generated C code from a Matlab-Simulink model (In Matlab help is "Parametric Audio Equalizer" -> "Task 6 - Integrate Device Drivers" -> "Configuration C") with a "Target Preferences" module for ...
0
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1answer
103 views

Issues in developing on OSK5912 (OMAP Processor)

I want to develop applications using OSK5912 - an OMAP DSP Kit. The problem is that the TI no longer provides development tools for the same as it is quite an old kit. For developing apps on Linux, ...
1
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4answers
967 views

DSP - Voice Activity Detection: what are my options?

In a performance sensitive environment, I have an audio stream. I need to classify each frame as speech/non speech. For this purpose, only "clean" voice should be classified speech. Voice with ...
6
votes
4answers
3k views

High Quality Audio ADC and DAC with Embedded

I am starting work on a project where I want to do some DSP using an embedded solution ideally with very low latency as it will be in a real time environment. In addition I want high quality, ...
8
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5answers
2k views

Does anyone know of a microcontroller/DSP with no clock speeds or any oscillators in excess of 1.705 MHz?

I am planning on making a simple electronic device which I might eventually try to market if it works out O.K. Before taking the plunge and trying to mass produce it, I would first try to sell a few ...
7
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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
2answers
472 views

Resource recommendations for DSP beginners

I was searching around and I have had some trouble finding some decent resources for an engineer first entering the world of DSP. What resources (books, tutorials, DVDs, online courses, etc) do you ...
3
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1answer
601 views

Fixed Point MATLAB DSP Algorithm

I've got a question about coding an algorithm for a Texas Instruments TMS320C64xx DSP in MATLAB: I've got a working sloppy implementation of my filter in MATLAB. My goal is to use MATLAB Embedded ...
2
votes
1answer
277 views

Up-sampling input signal

I have only 1 pulse as input and I use qubic-spline to reshape the pulse. The user plot manually the signal inputs from a flow-image and then the signal is imported to Matlab in a ASCII form. That ...
5
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6answers
2k views

Preventing audio signal saturation

I am trying to implement an algorithm on audio signals. The algo operates on the signal on a frame-by-frame basis. One of the intermediate stages requires addition of the signal to the previous frames....
5
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2answers
329 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 ...
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 ...
4
votes
1answer
292 views

Programming Interface for TI DSP

I'm about to design a PCB for a project with a TI DSP (TMS320C6720). What is the best method to use as an interface for getting the program onto the DSP? I haven't done this part myself before. I'll ...
10
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3answers
431 views

Which freeware analysis software most closely resembles the functionality of Matlab DSP toolbox

I'm looking for some freeware that will do (as much as possible) of what Matlab does DSP-wise... Filtering tools Modulation File I/O (as I need these to compare vhdl simulation results to software ...
2
votes
3answers
2k views

Reduce background noise from a .wav file?

I am planning to compare two audio files. I have recorded two voices and compared them using cross correlation. Since the presence on background noise while recording the resulting correlation value ...
6
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4answers
329 views

Tiny 8MSPS DSPs?

I have a problem: I've got five tiny CMOS image sensors (2mm x 2mm), each in a small space (about 10mm x 15mm). They take a clock signal in, and output an analog signal, requiring an 8MSPS ADC each. ...
4
votes
2answers
6k views

How much current can a microcontroller/DSP pin sink/source?

I'm using a TMS320F2812 and want to drive LEDs of some of the pins. I couldn't figure out what the safe levels of current were which could go in or come out of the IO pins from the datasheet. What is ...
7
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5answers
446 views

Removing digital noise in software

I have a design which expects a TTL level square wave from a radio reciever which is fed into a microcontroller. There is some TTL level noise as no encoding is done on the transmit end. I was ...