Re: question about sampling rate

["Clemens Ladisch" <cladisch@fastmail.net>]

Grace Baldonasa wrote:
> I am dividing the buffer size into 20 ms, in the given example, I am
> sending 176 bytes / packet.

This would correspond to a sample rate of 44000 Hz.

You cannot use a constant number of bytes per packet at 44100 Hz.

> I have here another scenario and I hope you can give me some idea again.
> I have converted a song using this configuration:
> sampling rate = 32000
> bit resolution = 16
> channel = stereo
> after this computation (32000*16*2) * 2 -> 128/packet
> 
> I used a speaker which is supporting a minimum frequency of 44100  and
> maximum of 48000. How can I adjust my streaming size now that the streaming
> configuration far below than the minimum supported by the speaker.

See section 5.12 of the USB 2.0 specification.

> I attached this speaker in windows and then played the converted file, it
> is sending 192bytes/packet, and the total bytes transffered had almost
> trippled the original size of the converted file.

Apparently, Windows has converted the data to 48 kHz.


Regards,
Clemens

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