[hatari-devel] Filters utilized more effectively

[Nicolas Pomarède]

Le 16/05/2011 00:08, David Savinkoff a écrit :

>> Just a small question regarding :
>>
>> +	/* Anti-alias filter is not required when nAudioFrequency == 50066 Hz */
>> +	if (nAudioFrequency>50000&&  nAudioFrequency<50100)
>>
>> Why don't you just use 	"if (nAudioFrequency==50066)" ?
>>
>   - A real Atari will not be exactly 50066 Hz
> *(50066 is probably only an accepted nominal value).

I don't understand what you mean ; a real STE is 50066 Hz (that one of 
the only 4 possible dma audio output frequencies).
I don't see how an STE could have a 50000 Hz dma output freq for example ?

>   - Someone may wish to experiment with 50000.
>   - 50066 is a prime number multiplied by 2.
>
> BTW, options.c limits the sample frequency from 6000 to 50066 Hz
> The enclosed testing patch references this (minor testing feature).

The idea is to give the user a choice of frequencies on his computer 
that are compatible with an STF/STE. Of course, we could allow 50200, 
but as said above, I don't understand how it would match a real STE ?


Nicolas