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- Newsgroups: comp.sys.mac.programmer
- Path: sparky!uunet!mcsun!news.funet.fi!ousrvr.oulu.fi!news
- From: Juha Pirttilè <juha@skynet.oulu.fi>
- Subject: Changing the sampling frequency of the Apple Sound Input Driver ???
- Message-ID: <1992Nov13.134932.28925@ousrvr.oulu.fi>
- X-Xxdate: Fri, 13 Nov 92 13:38:41 GMT
- Sender: news@ousrvr.oulu.fi
- Organization: Department of Physics, University of Oulu
- X-Useragent: Nuntius v1.1.1d12
- Date: Fri, 13 Nov 1992 13:49:32 GMT
- Lines: 25
-
- We are going to use the built in sound input system of the Mac to
- sample difference Doppler signals from navigational satellites. The
- built in sound input system seems to be OK for the job. However there
- is a slight problem. You can not change the sample rate from 22 kHz.
- This frequency is unnecessarily high for us and produces too large
- files (>20 MB).
-
- Is there an easy way to change the sample rate to 5 kHz? Or could
- someone at Apple make me a special version of the driver which
- samples the data at 5 kHz. I have already looked at the driver and
- it seems to me that the modification is not impossible (but it is
- very difficult without the sourve code).
-
- I think that if the sample rate of the built in sound input would
- be adjustable, the Mac would be a most elegant data collecting
- environment in many scientific applications.
-
- ********************************************************************
- * J u h a P i r t t i l { *
- * *
- * juha@skynet.oulu.fi addr. Yliopistokatu 38/521 *
- * tel: 358-81-361661 90570 Oulu *
- * Finland *
- * Macintosh Programmer *
- ********************************************************************
-