# 11.2 Speech processing: lpc exercise on ti tms320c54x

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You will write code to compute the autocorrelation or autocovariance of an input signal. Then you connect a microphone to the DSP and write code to detect the beginning of a speech segment. Finally, you will combine the two programs and compare results with MATLAB.

## Implementation

The sample rate on the 6-channel DSP boards is fixed at $44.1$ kHz, so decimate by a factor of $5$ to achieve the sample rate of $8.82$ kHz, which is more appropriate for speech processing.

Compute the autocorrelation or autocovariance coefficients of $256$ -sample blocks of input samples from a function generator for time shifts $l=\{0, 1, , 15\}$ ( i.e. , for $P=15$ ) and display these on the oscilloscope with a trigger. (You may zero outthe other $240$ output samples to fill up the $256$ -sample block). For computing the autocorrelation, you will have to use memory to record the last $15$ samples of the input due to the overlap between adjacent blocks. Compare the output on the oscilloscope withsimulation results from MATLAB.

The next step is to use a speech signal as the input to your system. Use a microphone as input to the original thru6.asm code and adjust the gains in your system until the output uses most of the dynamic range ofthe system without saturating. Now, to capture and analyze a small segment of speech, write code that determines the startof a speech signal in the microphone input, records a few seconds of speech, and computes the autocorrelation orautocovariance coefficients. The start of a speech signal can be determined by comparing the input to some noise threshold;experiment to find a good value. For recording large segments of speech, you may need to use external memory. Refer to Core File: Accessing External Memory on TI TMS320C54x for more information.

Finally, incorporate your code which computes autocorrelation or autocovariance coefficients with the code which takesspeech input and compare the results seen on the oscilloscope to those generated by MATLAB.

## Integer division (optional)

In order to implement the Levinson-Durbin algorithm, you will need to use integer division to do Step 1 of the algorithm. Refer to the Applications Guide and the subc instruction for a routine that performs integer division.

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Joseph
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Lohitha
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nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
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da
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Bhagvanji
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Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
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narayan
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
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Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
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Alexandre
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Rafiq
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Damian
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what is a peer
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What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
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Santosh
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Rafiq
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Mahi
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Rafiq
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Anam
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Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
how did you get the value of 2000N.What calculations are needed to arrive at it
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