Newsgroups: comp.speech
Path: lyra.csx.cam.ac.uk!warwick!uknet!EU.net!sunic!trane.uninett.no!nac.no!nntp.nta.no!hal.nta.no!hlj
From: hlj@hal.nta.no (Harald Ljoen)
Subject: Re: Anybody knows ILS-format?
Message-ID: <1994Aug30.105811.6169@nntp.nta.no>
Keywords: Speech,format,ILS
Sender: news@nntp.nta.no
Nntp-Posting-Host: thalia.nta.no
Reply-To: harald.ljoen@tf.tele.no
Organization: Norwegian Telecom Research
References:  <33utf0$s19@brachio.zrz.TU-Berlin.DE>
Date: Tue, 30 Aug 94 10:58:11 GMT
Lines: 24

In article <33utf0$s19@brachio.zrz.TU-Berlin.DE>, tiloafej@w250zrz.zrz.tu-berlin.de (Tilo Schuerer) writes:
>Hy,
>
>the German Telecom is seeling CD-ROM's with german speech on it.
>That speech is stored in ILS-format and I just don't know how
>to convert this to common formats. 
>
>Any hints are welcome!

ILS files have a 512-byte header organized as 128 4-byte integers, followed by the data
section, which normally contains 16-bits signed integers. For speech files, the interesting
fields in the header are (indices start at 1, this is FORTRAN, you know):

Index	Description

58	starting A/D channel
59	number of A/D channels
60	= 50 for 8 bit mu-law log quantization (REC)
61	sampling frequency exponent (base 10)
62	sampling freqency mantissa
63	= -32000 if sampled data (speech data**)

-- 
** Also sprach harald.ljoen@tf.tele.no **
