vgetty and SportsterVoice

Daniel Doering (daniel@greenie.muc.de)
Wed, 20 Jan 1999 22:27:01 +0100


) 
) > ) I tried at 44.1KHz and did a wavtopvf, then pvftormd US...4 ...
) > ) came up with a wrong speed (vgetty trying to play it).
) > could be the pvf-stereo problem. look at the attachment, hope that`ll
) > help. 
) 
) OK, I got a wav file in mono at 8K, converted to a pvf at 8K, 8 bits
) per sample (that what I got back from recording from the USR).

so it's not the stereo -> mono bug that annoyed me.... 
 
) When ever I convert from pvf to rmd, rmdfile reports back 1 bit/sample
) and I cant seem to change it).

you used both  

> pvftormd US_Robotics 1 infile.pvf outfile.rmd
and
> pvftormd US_Robotics 4 infile.pvf outfile.rmd
? 

) The modem is a USR SportsterVoice and seams to use compression method
) 1 i.e. gsm

Well as I am not really an expert on the tools (I just tried to supply
some basic info on how to use them - perhaps they integrated them into the
docs) I suggest that you put the question back to the list where the modem
gurus are... perhaps your modem doesn't support both modes.

hmmm.... I just tried <pvftormd US_Robotics 4> on pvf files with different
sampling rates (up to 22050) and it didn't give any error messages - so
either the US_Robotics supports several sampling rates (which i don't
really believe) or pvftormd doesn't do the checking for the correct
sampling rate in us-robotics-mode.

rmdfile reports it to be 
  modem type is: "US Robotics"
  compression method: 0x0004
  sample speed: 22050
  bits per sample: 4
and when piped back through rmdtopvf | pvftowav | play it sounds okay.
   (can't check with vm without a US Robotics modem :-) 

                    _______________________
      Yield to temptation. It may not pass your way again. 
Daniel Doering, Muenchen       *        daniel@ommm.greenie.muc.de 
                http://greenie.muc.de/~daniel/ 
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