FS#1 - uncompressed PCM recording

Attached to Project: Rockbox
Opened by Anonymous Submitter - Wednesday, 23 January 2002, 19:50 GMT
Last edited by Björn Stenberg (zagor) - Saturday, 21 September 2002, 20:06 GMT
Task Type Feature Requests
Category Codecs
Status Closed
Assigned To No-one
Operating System
Severity Very Low
Priority Low
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 0
Private No


I would like to have the ability to develop firmware
for the Archos Recorder that allows users to record
uncompressed PCM audio to the hard drive.

Useful potential features:

PCM recording to wave files.

A recording UI that allows settings similar to those
found on a DAT recorder:
sample rate selection
stereo of mono
input level control
recording feedback to the headphones
level meter

store date/time stamp info to each sound file.

John Burt
This task depends upon

Closed by  Björn Stenberg (zagor)
Saturday, 21 September 2002, 20:06 GMT
Reason for closing:  
Additional comments about closing:  Closing all feature requests.
Comment by Linus Nielsen Feltzing (linusnielsen) - Wednesday, 06 February 2002, 09:31 GMT

The 1Mbit/s link between the Mp3 chip and the CPU is a limiting factor.
Uncompressed 16bit audio at 44.1kHz needs about 1.5Mbit/s.

So the
theoretical maximum sample rate would be about 30kHz.
Comment by Björn Stenberg (zagor) - Sunday, 17 February 2002, 17:14 GMT

Actually, in the Recorder the MAS is connected via the
parallell interface (the data bus), not via the 1Mbit/s
serial interface.
Comment by Jason Brantley (jbboulder) - Friday, 31 May 2002, 08:24 GMT

Is this possible? Recording PCM would be great!

Comment by Björn Stenberg (zagor) - Friday, 31 May 2002, 08:27 GMT

It is possible, but we need to write new DSP code. We are desperately seeking information about the DSP but it is very hard to come by.
Comment by Anonymous Submitter - Thursday, 05 September 2002, 08:38 GMT

The classical Jukebox have an imput too, and he can
probably record in PCM too, that well be very interresting to
permit to the owners of Jukebox 6000 or studio to record in
PCM format.
Comment by Linus Nielsen Feltzing (linusnielsen) - Thursday, 05 September 2002, 08:41 GMT

Yes, the classical jukebox has a Line-In jack but the CODEC has *no*
recording capabilities. It doesn't even have an A/D converter!