audio input problem
- To: mathgroup at smc.vnet.net
- Subject: [mg16984] audio input problem
- From: pdickof at sk.sympatico.ca (Peter Dickof)
- Date: Sat, 10 Apr 1999 02:13:27 -0400
- Organization: Self
- Sender: owner-wri-mathgroup at wolfram.com
I am trying to input sounds I have recorded into Mathematica. The
example given in the add-on package book (MSwin chimes) works.
When I read my own file using command
astring=ReadSoundfile["E:\Recording\a440-2.wav",PrintHeader->True];
the following header info is returned:
Format: Multimedia WAVE
Duration: 9.15417 seconds
Channels: 1
Sampling Rate: 44100
Bits per sample: 16
Data size: 807398 bytes
Number of Samples: 403699
which agrees with what I know the file to contain (it was created with
Powertracks Pro Audio V5.0c and is playable in both that software and
with the Windows media player (V 6.00.02.0902). When I attempt
ListPlay[astring, SampleRate->44100, SampleDepth -> 16,
PlayRange->{-2^15,2^15}]
I get LOUD noise for about 1/2 second. The 1/2 second is consistent
with the contents of astring; the Length[astring] is 20154! A plot of
astring shows what appears to be a waveform with negative excursions
from +32768 (instead of 0) and positive excursions from -32768
(instead of 0)
Any ideas on what I am doing wrong?
Peter Dickof
pdickof at sk.sympatico.ca