Sound file quantization in Matlab

[techspeaks]

AoA to ALL!
I want to read a sound file in matlab, and set the sampling frequency to 8K. and represent each sample in 8-bits. play the result and also plot the frequency spectrum. i expect the spectrum should be from 0 to 4khz. plz tell me how to do all these in MATLAB.

simple & early reply is required.

 

[usman]

Re: quantization

u can do it so....

Y = wavread('file name');
Fs=8000;
N=8;
wavwrite(Y, Fs, N,'modified');
wavplay('modified')

best regards,

 

[rsrinivas]

quantization

u can use the wavread command to read the file
and wavplay to play the wav file
note in the above two methods u can change the bits/sample and sampling frequency. but i suggest u to use a wav file which is sampled at 8k si that u can get a nice output.
as a wave file is a digitized oneu cannot quantize it again u can increase or decrease the resolution of bits/sample and if u increase a 8 bit/sample to 16 bit/sample tha sample will be zero padded to make it 16 bits wherin u don't expect any sound quality improvemet

regards
srinivas