Re: Sampling frequency

[Jan Schnupp <jan.schnupp@xxxxxxxxxxxxxxxx>]

Dear Ajith,

there certainly are techniques for upsampling signals to higher sampling
rates that leave the original signal for all intents and purposes
unaffected. For example: if you were to do a fast fourier transform of the
original signal, then zero-pad the high-frequency part of the FFT to add
additional higher frequencies of zero amplitude, and finally do an inverse
FFT, then you should completely recover the original signal to within
rounding error of your computer´s floating point accuracy (i.e. with
completely negligible error as far as human hearing is concerned), only at
a correspondingly higher sample rate.

Regards,

Jan

>> Dear Members,
>>
>> Wish you all a very happy New Year!
>>
>>
>>
>> I would like to know has anybody tried to resample the signal after it
>> is being recorded, especially resampling to high frequency. Will the
>> tempo of the signal increases if signal is resampled to high sampling
>> frequency. (Fop e.g.; if a material recorded using 16000 Hz sampling
>> frequency is resampled to 44100 Hz). I understand that quality/
>> sampling error cannot be improved with this technique. I am interested
>> in knowing whether this will change some of the qualities of signal
>>
>> Regards
>>
>> Ajith
>>
>>
>>
>> Mr.Ajith Kumar U
>> Doctoral Student,
>> Department of Audiology,
>> All India Institute of Speech and Hearing, Naimisham Camppus,
>> Manasagangothri,
>> Mysore,570006
>> INDIA.
>> Ph:  +91 821 2514449 Ext 186 (O)
>>        +91 821 2514449 Ext 227 (R)
>> Fax: +91 821 2510515
>>
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