From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.work.de ([212.12.32.20]:48412 "EHLO mail.work.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751302AbZA0Vpc (ORCPT ); Tue, 27 Jan 2009 16:45:32 -0500 Message-ID: <497F8077.1030800@gmail.com> Date: Wed, 28 Jan 2009 01:45:27 +0400 From: Manu Abraham MIME-Version: 1.0 To: linux-media@vger.kernel.org CC: linux-dvb@linuxtv.org Subject: Re: [linux-dvb] Technotrend Budget S2-3200 Digital artefacts on HDchannels References: <640929.18092.qm@web23204.mail.ird.yahoo.com> <157f4a8c0901260739p424a74f6rcca2d84df04737b9@mail.gmail.com> <157f4a8c0901260741l4d263b8bk6e34cb5bb56d8c2@mail.gmail.com> <157f4a8c0901260751l39214908ydfeed5ba12b4d48b@mail.gmail.com> <157f4a8c0901260808i39b784f6m13db53db2f135a37@mail.gmail.com> <1a297b360901260950r599b944aoea24dcbdecbc9515@mail.gmail.com> <497F6B2E.6010305@gmail.com> <497F7C40.6030300@gmail.com> In-Reply-To: <497F7C40.6030300@gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Manu Abraham wrote: > For a lower sampling frequency (aka Symbol rate), you need a higher > clock and or higher time period. For higher sampling rates (Symbol > Rates) the the master clock has to be decimated to avoid overflows Sorry, an error in one part. ^^ For a lower SRATE, you need a lower clock and a longer period of time. With a higher SRATE for the same coeffecients, you are bound to overflow, unless you decimate certain register contents. Recalculating those register values are quite tedious and lots of calculations involved for a different master clock. The result with a higher master clock (with the same coeffecients), if you happened to see some positive results, it was the result of some overflow or underflow, which is for sure. Manu