Description:
Digital Signal Processing using computers.
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Interpolation of a Discrete Periodic Signal
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So, this was an ongoing discussion in another thread, and it's been going
on long enough that it probably deserves its own thread. I'm going to
switch the notation to use 'n' in the time domain and 'k' in the frequency
domain.
To summarize the problem:
Given a signal x[n] such that x[n+N] = x[n] for all n. x[n] may be... more »
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Help with IIIR filters
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I have a problem understanding IIR filter stability problems. The problem
is this; I can't find any stability problems with IIR filters.
I have a health problem that prevents me from working, so as a hobby, I
write analog and digital filter design software. I have 25 years of RF
design experience and I am pretty sure I know when a circuit is unstable,... more »
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Video mixing solution for H.264 streams
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Hello
i need to develop a video mixing solution for h.264 streams.I need a
pointer about how to go about it.Is there any Third party toolbox in MATLAB
which can take me directly into video codecs internal working and then
perhaps implement a video mixing algorithm.
i tried to search on internet,but it didn't help much.also please point to... more »
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integer multiplication
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(cross posted to comp.dsp and comp.lang.c.)
are compilers now-a-days smart enough to multiply two N-bit numbers to
a 2N-bit result without wasting instructions in the generated machine
code?
like, we know for C, a long times a long is a long. but if you cast
one of the multiplicands to (long long), and then multiply, you get a... more »
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I love my job
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I sat down today to get in a little bit of work over the weekend on a communications project I'm doing for a customer. The channel is not only highly dispersive, but I'm stuck with a legacy modulation method that does not cough up a non-correlated mix of symbols, and at any rate the system as a whole is used for feedback where you just can't throw away a... more »
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The Delay of Minimum Phase FIR filter
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Dear all,
I would like to ask is there any way to have analytical estimation value of
delay of minimum phase FIR filter based on the following assumptions:
1. we regard the position of largest magnitude coefficient as the delay, so
for linear symmetric FIR filter the delay = (N+1)/2, where N is number of... more »
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A purely theoretical question
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Hi group
I have a purely theoretical question.
When doing a FFT of an unwindowed pure sine signal, if the frequency
doesn't match a bin frequency, many bins will have a magnitude > 0.
Because the magnitude of each bin fits the same sinc curve, the
magnitude of each bin can be "predicted" (calculated) once you know... more »
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Convolving input samples with a filter
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Hi group
I am coding a program to do some filtering on an audio file.
So using the method described in Steven Smith's excellent book "The Scientist and Engineer's Guide to Digital Signal Processing",
I have designed a filter with 41 coefficients and having a desired
frequency response.
Now I need to convolve this with a number of input samples.... more »
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Adding AWGN to signal
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Hi all,
I always get confused while adding AWGN in my simualtions via AWGN block.
What is the right way to calculate "Input signal power, referenced to 1
ohm (watts)" parameter for different moudlation schemes when mode is set to
SNR? Lets say we have QAM, 16QAM and 64QAM? Any guidance would be... more »
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