Audio Banter - View Single Post

**Rich Grise**

On Thu, 04 Aug 2005 01:07:23 +0100, Pooh Bear wrote:

wrote:

wrote:
Pooh Bear wrote:
DaveC wrote:

Is there a wireless solution to distributing audio throughout a residence to
8 rooms? Digital?

Something similar to wireless computer networking...

Currently only at mp3 like quality. True16 bit linear pcm in
stereo @ 44kHz sampling requires something like about 6 Mbps
of bandwidth.

44,1000 ksamples/sec * 16 bits/sample * 2 channels = 1,411,200 bits/sec

Sorry, that's:

44,1000 samples/sec * 16 bits/sample * 2 channels = 1,411,200 bits/sec

or

44.1 ksamples/sec * 16 bits/sample * 2 channels = 1,411,200 bits/sec

In any case, it's 1.4 Mbits/sec, NOT 6 Mbits/sec.

That's the raw data rate only !

Now you have to add overhead for the frequency hopping stuff, handshaking, whatever
and redundancy for lost packets - and I've no idea how the data's encapsulated -
there'll doubtless be extra stuff there too. I'm not calculating this myself, I have
it on good authority from some guys who are developing the product. I was quite
surprised how much overhead is required myself actually.

You don't have to use TCP/IP, and you don't need, or even want, lost
packet redundancy, at least not for streaming audio. If you need a
protocol at all, use something like UUCP.

Cheers!
Rich