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- Path: sparky!uunet!caen!uwm.edu!csd4.csd.uwm.edu!info-high-audio-request
- From: Andy Sheen <sheen@src.bae.co.uk>
- Tue, 17 Nov 92 08:16:27 GMT
- Newsgroups: rec.audio.high-end
- Subject: Re: Why digitize: some bunk
- Date: Tue, 17 Nov 92 08:16:27 GMT
- Organization: University of Wisconsin - Milwaukee
- Lines: 29
- Approved: tjk@csd4.csd.uwm.edu
- id <g.12106-0@ben.uknet.ac.uk>; Thu, 19 Nov 1992 01:34:18 +0000
- id <14041-0@eros.uknet.ac.uk>; Thu, 19 Nov 1992 01:33:54 +0000
- Message-ID: <1eg6t2INNsio@uwm.edu>
- NNTP-Posting-Host: 129.89.7.4
- Originator: tjk@csd4.csd.uwm.edu
-
-
-
- hsu@ecf.toronto.edu (HSU TITUS HENG-HSUEH) writes:
-
- >...someone has propsed that although
- > we cannot 'hear' anything above 20kHz, but the frequency components all the
- > way up to 90kHz have influences on what we hear. This may explain why
- > the new systems strive for a higher sampling rate, and people commonly
- > acknowledge that higher sampling rate helps. Pioneer's new Legato system
- > does just that. Legato analyzes the frequency content within the 20-20k
- > bandwidth, and extrapolate the infor above 20k. Martin Colloms has reported
- > good results with the Legato system.
-
- It was my impression (via Audiophile) that the Legato system didn't do any
- analysis of the signal, it merely didn't put a brick wall filter at 22kHz,
- just a lower order filter (I think it's first order). This has two side
- effects:
-
- 1) Reduces phase distortions inside the audible band.
- 2) Allows contributions from the band up to 22.05kHz, but actually
- appearing reflected at 22.05kHz (i.e. 22.0kHz produces an output at
- 22.1kHz etc), through to the analogue output.
-
- Pioneer claim that this is better as it is more representative of the type
- of filtering available in the real world and hence sounds better. Does
- anyone know the definitive answer to how Legato works ?
-
-
-
-