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Revision 7 as of 2016-08-14 14:33:14
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Editor: rune
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Revision 8 as of 2016-09-17 08:41:41
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Editor: rune
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= ATM inspired headphones = This idea is 10 years out of date. I considered old data for bluetooth - in 2002 bluetooth could only transfer data at 700 kbps so a set of headphones was impossible - turns out Bluetooth 4.0 does not remotely has this problems so the idea is completely out of date.
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This was a result of getting the Sennheiser RS 110 II - those wireless headphones is an embarrassment for SH - analogue sound transfer headphones (FM) belong in the '80ties and please stay there!

Why do I want ATM inspired transfer? Because ATM does not use any frame markers and just transfers a sequence of bits and start looking for a frame header bit-by-bit - that is easy to make and probably cheap - there must be hundreds of ASIC available to do that...

{{{
d 0000 8bit 8khz 48 24 3ms
d 0001 8bit 16khz 48 24 1,5
d 0010 8bit 22050 48 24 0,6ms
d 0011 8bit 44100 48 24 0,3ms
  0100 16bit 22050 24 12 544us
  0101 16bit 44100 24 12 282us
  0110 16bit 24000 24 12 500us
  0111 16bit 48000 24 12 250us
u 1000 24bit 22050 16 8
u 1001 24bit 44100 16 8
u 1010 24bit 48khz 16 8
u 1011 24bit 96khz 16 8
% 1100 32bit 24 12 6 250us
% 1101 32bit 48 12 6 125us
% 1110 32bit 96 12 6 625ns
% 1111 32bit 192 12 6 312,5ns

bb ss
bb - 8-00, 16-01, 24-10 or 32-11
ss -

d - discout
u - upmarket
%- audiophool

frame transmitted - 1 char per bit
  cccc qqqq
  pppppppp
  hhhhhhhh
  ...48 bytes PL...

cccc - channel
qqqq - quality as given above
pppppppp - payload CRC
hhhhhhhh - header CRC to syncronise
}}}

[[attachment:runes-headphones.ods]]
If you want to see my outdated idea press info>versions

This idea is 10 years out of date. I considered old data for bluetooth - in 2002 bluetooth could only transfer data at 700 kbps so a set of headphones was impossible - turns out Bluetooth 4.0 does not remotely has this problems so the idea is completely out of date.

If you want to see my outdated idea press info>versions

Ideas/ATMHeadphones (last edited 2016-09-17 08:41:41 by rune)