Boston Audio Society - ABX Testing article From the BAS Speaker Aug.-Sept. 1984 The Digital Challenge: A Report by Stanley P. Lipshitz University of Waterloo Waterloo, Ontario Canada Some readers may be unaware of the background to the "digital test" in which Ivor Tiefenbrun participated on February 23, 1984 [1-4]. I therefore challenged the "anti-digital" community in general, and Tiefenbrun in particular, to participate in a blind listening test of the PCM-F1 to give them the opportunity to substantiate their claims of poor sound. The test took place in the home of the local Linn distributor, Mr. The day began with two brief tests of the Tiefenbrun claim that undriven transducers (digital alarm watches, telephones, headphones, or other loudspeakers) in the same room audibly degrade the sound quality - a claim which forms the rationale behind their "single speaker" demonstration demand. The second test, also single-blind, used a Linn "Kan" loudspeaker as the undriven transducer. What conclusion can we draw from this? References:
Ogg Vorbis) Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel. This places Vorbis in the same competitive class as audio representations such as MPEG-4 (AAC), and similar to, but higher performance than MPEG-1/2 audio layer 3, MPEG-4 audio (TwinVQ), WMA and PAC. The bitstream format for Vorbis I was frozen Monday, May 8th 2000. All bitstreams encoded since will remain compatible with all future releases of Vorbis. A format specification and related documentation are available on this site.The libvorbis reference implementation provides both a standard encoder and decoder under a BSD license. [Source download] [SVN trunk] The Tremor reference decoder provides an integer-only implementation of the decoder for embedded devices [SVN trunk] [low-memory branch]
niceplayer - Google Code This program aims to be a multi-engine player designed for playing movies nicely for a person who likes to watch or present movies on their computer (such as the casual viewer or the video artist). This program features full screen or border-less floating windows, convenient controls for scrubbing or queuing movies, and on the fly playlist creation. Features Zoom-able full screen playback Multi-screen support Boarder-less Windows Floating Windows Below Desktop Windows Heads Up Display controls Playlist Drag & drop Fully AppleScript-able DVD Playback On the fly swappable plug-in engine support Chapter Support Transparent Playback Apple Remote Support Adjustable aspect ratio Resolution Independence Download the latest release, NicePlayer Mavericks Edition (0.98-rc)
24/192 Music Downloads are Very Silly Indeed Also see Xiph.Org's new video, Digital Show & Tell, for detailed demonstrations of digital sampling in action on real equipment! Articles last month revealed that musician Neil Young and Apple's Steve Jobs discussed offering digital music downloads of 'uncompromised studio quality'. Much of the press and user commentary was particularly enthusiastic about the prospect of uncompressed 24 bit 192kHz downloads. 24/192 featured prominently in my own conversations with Mr. Unfortunately, there is no point to distributing music in 24-bit/192kHz format. There are a few real problems with the audio quality and 'experience' of digitally distributed music today. 24/192 solves none of them. First, the bad news In the past few weeks, I've had conversations with intelligent, scientifically minded individuals who believe in 24/192 downloads and want to know how anyone could possibly disagree. I was also interested in what motivated high-rate digital audio advocacy. Gentlemen, meet your ears
ezxdisp Introduction ezxdisp is a simple graphics library in C that works on X11 and Win32 platforms. This library has a small set of functions for drawing 2D/3D graphics. #include <stdio.h> #include "ezxdisp.h" int main(int argc, char *argv[]) { ezx_t *e; e = ezx_init(200, 200, "no title"); ezx_set_background(e, &ezx_white); ezx_fillcircle_2d(e, 100, 100, 40, &ezx_red); ezx_redraw(e); ezx_pushbutton(e, NULL, NULL); ezx_quit(e); return 0; } News 2007-11-28 - ezxdisp-0.1.4 released [ChangeLog]. Download ezxdisp is a free software under the terms of the GNU Lesser General Public License version 2. ezxdisp-0.1.4.tar.gz (168K, MD5 checksum: 15e96cebf9796c7dc1775c4b3324776f) Screenshots Some screenshots are available here. Building the Library The ezxdisp package does not contain a configure script, but does contain the platform-specific Makefiles for building a static library named libezx.a. On a x11 platform To build libezx.a, run 'make' in the 'src/x11' directory. On a win32 platform Documentation Contact
boxee: the open, connected, social media center for mac os x and linux 24bit vs 16bit, the myth exploded! It seems to me that there is a lot of misunderstanding regarding what bit depth is and how it works in digital audio. This misunderstanding exists not only in the consumer and audiophile worlds but also in some education establishments and even some professionals. This misunderstanding comes from supposition of how digital audio works rather than how it actually works. When recording, an Analogue to Digital Converter (ADC) reads the incoming analogue waveform and measures it so many times a second (1*). So far so good, what I've said until now would agree with the supposition of how digital audio works. Dither: Essentially during the conversion process a very small amount of white noise is added to the signal, this has the effect of completely randomising the quantisation errors. Hopefully you're still with me, because we can now go on to precisely what happens with bit depth. So, can you actually hear any benefits of the larger (48dB) dynamic range offered by 24bit?
System Rozpoznawania Słów Biblioteka, nagłówek oraz dokumentacja dla programistów chcących wykorzystać system w swoich programach. Demostracja działania systemu. Po uruchomieniu rozpoznaje (albo i nie ;) ) kilka słów mówionych do mikrofonu. Aplikacja testowa systemu. Do programu dołączone są wzorce trzech słów (ala, genowefa, chlew) oraz plik szablonu słownika (ala_genowefa_chlew.wpd). Z chęcią poznałbym Wasze uwagi na temat jakości pracy detektora słów - proszę wysyłać ewentualne maile na cin@skrzynka.pl Bardzo Prosty Program Demonstracyjny. Oto końcowy efekt działania SRIS-a :) Wykorzystanie jego możliwości w zastosowaniach praktycznych oraz poprawa pewnych elementów to temat do dalszych prac. Edytor szablonu słownika. Zrzut z prototypowej aplikacji testującej system (wersja alfa 2) przedstawiający wykresy parametrów (cech) MFCC dla stanów ustalonych różnych dźwięków. Obraz przedstawia dwa słowa 'ala'. Porównanie dwóch wzorców polega na porównaniu przebiegu ich parametrów MFCC. Efekt działania detektora głosu.
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