sample rates in audio

Sivakatirswami katir at hindu.org
Thu May 18 02:43:13 EDT 2006


Theoretical only...

on recordSound
   set the recordsamplesize to 16
   set the recordrate  to 2.5
   set the recordformat to "wave"
   record sound file gAudioTestPath
end recordSound


Doesn't do anything... movie props still   show 16 bit, 8 kHz... and  
files is exactly the same as

on recordSound
   set the recordsamplesize to 11
   set the recordrate  to 5
   set the recordformat to "wave"
   record sound file gAudioTestPath
end recordSound

on recordSound
   set the recordsamplesize to 16
   set the recordrate  to 8
   set the recordformat to "wave"
   record sound file gAudioTestPath
end recordSound


each of the above delivers the same size file, quality and movie  
props in QT pro

I don't get anything decent with 8 bit at all.




On May 17, 2006, at 12:41 PM, Stephen Barncard wrote:

> Hey if 2.5 is ok for your high freq response - fine for speech and  
> some sounds.
> Music?  hmmmmm...
>
> sqb
>
>> Oh my... now wonder it is so confusing... "recordSampleSize" is  
>> NOT the sample rate...
>>
>>
>> On May 16, 2006, at 3:15 PM, Stephen Barncard wrote:
>>
>>> I don't know how rev would store an 11 bit wide word without  
>>> waste. Computers store info in their nice 8-wide world. It comes  
>>> down to parts and sanity. There are packing methods to do this -  
>>> is that's what's happening here?
>>>
>>> Try a test. See if there is no difference in file size between  
>>> using 11 bit and 16 bit wide for  RecordSampleSize
>>
>>
>> Confirmed, you are so right...
>>
>> on recordSound
>>   set the recordsamplesize to 11
>>   set the recordrate  to 5
>>   set the recordformat to "wave"
>>   record sound file gAudioTestPath
>> end recordSound
>>
>> 12 secs --> 184K
>>
>> open in QT Pro, get movie props... it shows 16 bit, 8 khz
>>
>> on recordSound
>>   set the recordsamplesize to 16
>>   set the recordrate  to 8
>>   set the recordformat to "wave"
>>   record sound file gAudioTestPath
>> end recordSound
>>
>> 12 secs --> 184K
>>
>> Same size, same quality...
>>
>> Sivakatirswami
>
> -- 
> stephen barncard
> s a n  f r a n c i s c o
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