DSP stands for Digital Signal Processing or Digital Signal Processor.
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2answers
41 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 ...
0
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0answers
33 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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0answers
24 views
Asic Ideas (FFT, AES, Motion Estimation) [duplicate]
Could you give me a list of applications with kernels that can be accelerated in hardware?
Some examples would include FFT, AES, Motion Estimation, Viterbi Decoder. I'm just looking for others.
I'm ...
0
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0answers
52 views
How much of “hardware” video codecs is actually implemented as fixed-function circuitry? [closed]
Many GPUs and mobile SoCs nowadays provide hardware accelerated decoding of most of the common video codecs (H.264, MPEG-4 part 2 etc).
I'm wondering how they support the various codecs internally: ...
2
votes
2answers
90 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 ...
1
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0answers
83 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
79 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 ...
4
votes
3answers
195 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). ...
2
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4answers
218 views
Microcontroller suggestion
Im designing an analog audio amp with a 6 band analog equalizer controlled via a 7" LCD touch screen. Im wanting to preform a real time 2048 point FFT and display it on the screen in some kind of ...
0
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1answer
115 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 ...
0
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2answers
148 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
230 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 ...
1
vote
2answers
92 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 ...
0
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1answer
58 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 ...
4
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3answers
154 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 ...
1
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2answers
163 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 ...
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0answers
47 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
106 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 ...
1
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0answers
166 views
Microphone and speaker types in a DSP audio processing application
I am attempting to design and build a PCB from scratch. The hardware is meant to be used in a DSP audio processing application. What I want to achieve is to be able to collect sound through a ...
2
votes
1answer
260 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 ...
0
votes
1answer
144 views
Spot beam (Coverage area) and beam width [closed]
Spot beam is simply a manifestation of my simulation model. It says that given a certain azimuth angle and an elevation angle, then what is the area of circle in space at a distance R away from the ...
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1answer
121 views
SQNR of 16 bit signed multiplication with MSB storing in 16 bits
I'm trying to figure out what the SQNR is if I multiply 2 16-bit signed integer values and store the result as a 16-bit signed integer, dropping the least significant bits.
For example:
a (16 bit ...
1
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1answer
66 views
Interfacing 3.3V Flex 6000 FPGA to a 5V CMOS DSP (Multivolt IO Question)
I'm going to interface a 5V CMOS DSP to the 3.3V Flex 6000 FPGA.
This FPGA supports 3.3V and 5V IO according to the below figure from the datasheet:
Since the FPGA I found in stock is the 3.3V ...
3
votes
1answer
168 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 ...
5
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2answers
177 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 ...
1
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1answer
77 views
Is there a C671x DSP development kit with more than 16M Flash?
TI's standard kit C6713DSK has only 256K bytes of Flash, which is too small for my application. Is there a third-party DSP kit that has a larger Flash like 16M bytes?
1
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0answers
64 views
Calculating delay caused by the voltage translator chip GTL2000/NVT2000
I want to interface a 5V DSP to a 3.3V FPGA so I need to use voltage/Logic translators for the data, address and control buses.
I found this translator: GTL2000 , It's available in a 22-bit package ...
1
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2answers
196 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 ...
4
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3answers
605 views
What are the the advantages of a switched capacitor filter over a digital filter?
The main advantage that switched capacitor filters seem to have over digital filters is the potential to achieve a high dynamic range, since the signal does not have to be quantized.
As discrete time ...
2
votes
1answer
246 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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0answers
113 views
DVSDK OMAPL138 Software Developer
I want to develop and run a program on the development kit
"Zoom™ OMAP-L138 EVM"
with the DVSDK, but I can not boot the Linux image from the SD Card.
I followed the guide "OMAPL138 Software ...
0
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1answer
96 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?
...
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2answers
529 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
204 views
Periodic graph in frequency domain
Why is that the frequency domain has the same shape all through out? Look at figure b
2
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1answer
157 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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3answers
393 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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2answers
312 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 ...
5
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1answer
385 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.
...
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1answer
239 views
Need an advice with choosing FPGA kit to be used for wireless application [closed]
I need to implement a Wireless (802.11n) firewall as a FPGA application, so basically what i need is an FPGA kit that can handle the trans-receiver part for me, while giving me the ability to process ...
1
vote
3answers
1k 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 ...
3
votes
2answers
338 views
Meaning of phase in Fourier Transform of audio signal
I'm looking at the Fourier Transform (really, at a sliding DFT) to analyze (visually and intuitively) the frequency components of a sound over time. But the DFT produces complex numbers, and I'm not ...
0
votes
1answer
83 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, ...
3
votes
4answers
953 views
Serial to USB converter
I have a DSP kit with a serial connection. Since, I am operating on my laptop, I do not have access to a serial port. So, I would require a Serial to USB converter
How do I create a Serial to USB ...
1
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4answers
426 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 ...
1
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1answer
260 views
How to select a DSP chip for ECG/EMG signals
I want to select a DSP chip which I can use for some ECG/EMG signal processing. I am looking for an evaluation kit. The input signals are already in digital format (taken from phsionet.org). I am also ...
1
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2answers
213 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
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1answer
653 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 ...
9
votes
5answers
10k views
Code example for FIR/IIR filters in VHDL?
I'm trying to get started with DSP in my Spartan-3 board. I made a AC97 board with a chip from an old motherboard, and so far I got it to do ADC, multiply the samples for a number <1 (decrease ...
6
votes
2answers
295 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 ...
1
vote
1answer
662 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 ...
