another GPS idea - speed-sensitive voicemail

[Ian Stirling]

Shachar Shemesh wrote:
> Ian Stirling wrote:
> 
>>There are 2 D/A, 2 A/D flexibly routed, and one D/A that is dedicated
>>to the earpiece.
>>
>>About the only limitation is that you can't do things that would
>>require more IO sources than are available.
>>For example, playing stereo MP3, and acting as voicemail/answerphone
>>may not be possible.
>>(It'd have to drop to mono).
> 
> Lost you there. You seem to suggest the following route for recording
> voice calls:
> 1. Call arrives compressed with a GSM codec
> 2. Phone decompresses codec
> 3. Phone moves uncompressed stream through D2A
> 4. Phone further moves stream through A2D
> 5. Phone compresses the resulting stream
> 6. Phone saves compressed stream, presumably to the flash
> 
> Why not just do:
> 1. Call arrives compressed with a GSM codec
> 2. Phone saves compressed stream to flash

Because the GSM modem outputs analog.
It does not output digital information.