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364Re: Audio Files Question

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  • ak5z
    May 1 10:24 AM
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      Good information and explanation, Dave. Thanks.

      John, AK5Z


      --- In irlp-embedded@yahoogroups.com, "ve7ltd" <dcameron@...> wrote:
      >
      > Raising the sampling rate linearly raises the file size. Also you get
      > no advantage of raising the sampling rate, as all it does is allow
      > you to produce higher "frequency" response. If you are running FM
      > with a +-5Khz bandwidth, a sampling rate of 8000hz is optimal.
      >
      > Going higher may provide you with slightly better fidelity, but with
      > the offset of much higher file size.
      >
      > As for custom audio files, if they are being played with
      > the "wavplay" script, then you need to have them 8-bit, 8000hz. If
      > you want to play them with your own player, or customize the wavplay
      > script to play them, you can put CD quality audio on your node :)
      >
      > Just remember that the file size will be large.
      >
      > Dave Cameron
      >
      > --- In irlp-embedded@yahoogroups.com, "ak5z" ak5z@ wrote:
      > >
      > >
      > > That's an excellent question, Don. I know the wav files must be 8-
      > bit
      > > mono, but I wondered about the Sample Rate as you have also for the
      > > embedded nodes. Raising the Sample Rate shouldn't increase the size
      > of
      > > the files. (Keep them small is important to save server space.) A
      > > higher Sample Rate would give better audio and still be 8-bit
      > mono. I'd
      > > be interested in hearing a response from one of our IRLP tech
      > assistance
      > > folks.
      > >
      > > John, AK5Z
      > >
      > > Node 3600
      > > --- In irlp-embedded@yahoogroups.com, "Don Morehouse" <donmor46@>
      > > wrote:
      > > >
      > > >
      > > > For audio files in Redhat V7.3 , V9.0 etc the audio files had to
      > be
      > > > pcm 8000 Hz mono. Is that still the case for the embedded nodes
      > or can
      > > > one use 44100 etc? Audio files would be used along with some of
      > the
      > > > audio files used in the speaktime audio.
      > > >
      > > > Thanks
      > > >
      > > > Don VE7EDA
      > > > Node 1144, 1811 & 1946
      > > >
      > >
      >
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