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edavey : audio   61

L-15D D-Amp – Volvotreter Homepage
The SMSL SA-50 Class T amp had to leave because I built a stereo L-15D amp. It is based on the integrated analog input Class D audio amplifier driver IRS2092 and the digital audio MOSFET half bridge IRFI 4019. PCB designed and manufactured by LJM.
10 weeks ago by edavey
Getting EBU R128 on the web – Web Audio Tech
A few years ago, the European Broadcasting Union (EBU) has released a recommendation on how to measure loudness and how to distribute audio material with the right loudness. After that, some metering plugins for DAWs popped up but I haven’t seen anything like that for the web.

That’s why I created something called LoudEv, an open-source online loudness evaluator, which is compliant to EBU R128.
audio  loudness  compression 
january 2016 by edavey
Think DSP
The premise of this book (and the other books in the Think X series) is that if you know how to program, you can use that skill to learn other things. I am writing this book because I think the conventional approach to digital signal processing is backward: most books (and the classes that use them) present the material bottom-up, starting with mathematical abstractions like phasors.

With a programming-based approach, I can go top-down, which means I can present the most important ideas right away. By the end of the first chapter, you can decompose a sound into its harmonics, modify the harmonics, and generate new sounds.
dsp  audio 
july 2015 by edavey
measure free air resonant frequency
measure free air resonant frequency of re-foamed 104/2 drivers
audio  kef 
june 2015 by edavey
refoaming 104.2 drivers
audio  kef 
june 2015 by edavey
Auphonic Audio Examples
This page contains a short description and listening examples of our audio algorithms. Everything is done automatically – you can try Auphonic yourself with all unprocessed files and will get the same results.

The following algorithms are discussed:
Adaptive Leveler
Auphonic Multitrack Algorithms
Global Loudness Normalization and True Peak Limiter
Noise and Hiss Reduction
Hum Reduction
Each audio example is divided into multiple segments and is annotated with details about the algorithms (written above the waveform). Click inside the waveform to seek in files and listen with headphones to hear all details!
april 2015 by edavey
Codecs — Audiocogs
Web browsers are becoming more and more powerful, and new APIs like the Web Audio API and Audio Data API are making the web an ever more interesting and dynamic place. At Audiocogs we are invested in improving the state of audio on the web, and with JSMad showed that decoding audio purely in JavaScript is possible thanks to these APIs and the hard work of browser makers and spec authors. Now we’ve done it again — not just once, but three more times! With these, it is possible to play MP3, Apple Lossless, FLAC, and AAC even in browsers without native support.

With JSMad we showed that decoding audio in JavaScript is possible, courtesy of these APIs and the hard work of browser creators and spec authors. After that, we ported the recently open sourced Apple Lossless decoder to JavaScript as alac.js. However, we decided that wasn’t enough, so we rolled out flac.js. Then, suddenly, aac.js appeared.
audio  javascript 
march 2015 by edavey
Circles Sines and Signals - Introduction
audio  dsp 
march 2015 by edavey Video
Xiph.Org has undertaken a series of self-produced videos to spread techie-level knowledge about digital media as well as our own work involving new media research.
audio  video 
july 2014 by edavey
beets: the music geek’s media organizer
The purpose of beets is to get your music collection right once and for all. It catalogs your collection, automatically improving its metadata as it goes using the MusicBrainz database. Then it provides a bouquet of tools for manipulating and accessing your music.
audio  music 
may 2014 by edavey
Hacking Sonos — Medium
In my spare time I’ve been writing an app that replaces the Sonos app used to control multiple speakers in one’s home. It’s been a little challenging so I thought I’d share how I got where I am.
music  audio  raspberry_pi 
april 2014 by edavey
[no title]
drawing a spectrogram with the prong libarary on top of d3
audio  d3 
february 2014 by edavey
id3.js - Javascript ID3 tag parser
id3.js is a JavaScript library for reading and parsing ID3 tags of MP3 files. id3.js can parse both ID3v1 and ID3v2 tags within a browser or Node environment. It also supports reading from local files (Node-only), same-origin URLs (AJAX) and File instances (HTML5 File API).
mp3  javascript  audio 
november 2013 by edavey
SpeakerTalk :: Index
This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
audio  speakers  kef 
august 2013 by edavey
BiAmp (Bi-Amplification - Not Quite Magic, But Close) - Part 1
Most people would tend to think that bi-amping a hi-fi system (or even a sound reinforcement system) is unnecessary, or only for the most esoteric of systems. This is not the case, as the following article will attempt to demonstrate. There are very real advantages to using bi-amplification instead of the standard arrangement we commonly use, where one power amplifier must drive all the loudspeakers in the enclosure, along with the typical passive crossover network which can - at times - have a mind of its own!

If you are in a position to spend $25,000 or more for a pair of speakers, then this is approaching the 'cost no object' arena, but the majority of people cannot afford such luxuries, and must settle for something a little more pedestrian. As a result, very few systems will be as good as they can be. Biamping is not a simple tweak, and is not to be taken lightly. Make no mistake though, its application will improve almost any loudspeaker available, with very few exceptions.
may 2013 by edavey
0xFE - 11111110b - 0376 - 254 - b9#9: A Web Audio Spectrum Analyzer
In my last post, I went over some of the basics of the Web Audio API and showed you how to generate sine waves of various frequencies and amplitudes. We were introduced to some key Web Audio classes, such as AudioContext, AudioNode, and JavaScriptAudioNode.
This time, I'm going to go take things a little further and build a realtime spectrum analyzer with Web Audio and HTML5 Canvas. The final product plays a remote music file, and displays the frequency spectrum overlaid with a time domain graph.
fft  spectrum  audio  guitar 
march 2013 by edavey
Introduction to Spectrum Analysis - by David Courtney
The technique of designing musical instruments has not changed much in the last several thousand years. A maker builds an instrument, listens to the tone, then repeats the entire process with a slight change in construction. This is a tedious process and one often thinks that it could be easier if there was a way to "see" the sound. Spectrum analysis is a tool that gives us the ability to see the timbre. In this article we will discuss its various aspects; including sampling theory, processing, and graphic output.
guitar  fft  spectrum  audio 
march 2013 by edavey
Web Audio API overview (Part 1 of 2)
In the next 2 blog posts I’ll be showing you some essential features of the Web Audio API. You can find its specification here. The Web Audio API provides nearly all the functionality of a normal synthesizer, one of the reasons why it is so powerful.
audio  javascript  fft  spectrum  guitar 
march 2013 by edavey
Javascript Sound Experiments - Spectrum Visualization [ProcessingJS + WebAudio] « stc || infobar >> research
This entry is just a quick add-on for my ongoing sound related project that maybe worth sharing. I came up with the need of visualizing sound spectrum. You might find a dozen of tutorials on the topic, but I didn’t think that it is so easy to do with processingJS & Chrome’s WebAudio Api. I found a brilliant and simple guide on the web audio analyser node here . This is about to make the visuals with native canvas animation technique. I used the few functions from this tutorial and made a processingJS port of it. The structure of the system is similar to my previous post on filtering:

1. Load & playback the sound file with AudioContext (javascript)
2. Use a function to bridge native javascript to processingJS (pass the spectrum data as an array)
3. Visualize the result on the canvas
javascript  audio  fft  spectrum  processing  guitar 
march 2013 by edavey
Exploring the HTML5 Web Audio: visualizing sound |
If you've read some of my other articles on this blog you probably know I'm a fan of HTML5. With HTML5 we get all this interesting functionality, directly in the browser, in a way that, eventually, is standard across browsers. One of the new HTML5 APIs that is slowly moving through the standardization process is the Web Audio API. With this API, currently only supported in Chrome, we get access to all kinds of interesting audio components you can use to create, modify and visualize sounds (such as the following spectrogram).
javascript  audio  guitar  fft  spectrum 
march 2013 by edavey
Archimago's Musings
As I discussed with a few people over the last 2 weeks, I wanted to put up an audio test to see if I can capture some data among music lovers and audiophiles regarding MP3. Well... Here it is!
december 2012 by edavey
Opentape is a free, open-source package that lets you make and host your own mixtapes on the web.

Upload songs (via web or FTP), reorder, rename, customize the style, and share what you like on other sites with an embeddable player.
music  audio 
march 2012 by edavey
Playdar - Music Content Resolver
Playdar is a music content resolver service - run it on every computer you use, and you'll be able to listen to all the songs you would otherwise be able to find manually by searching though all your computers, hard disks, online services, and more.

Playdar provides a consistent API for accessing any song ever recorded. Learn more...

Got Playdar running? Check the Playdar Web Demos and see how web pages can integrate Playdar to take advantage of music you already have.

Playdar is free and Open Source (MIT License), and written primarily in Erlang.
You can extend it by writing additional resolvers in any language you like, not just Erlang.
audio  music  development 
december 2011 by edavey
Subsonic » Free Music Streamer
Listen to your music wherever you are. Share your collection with family and friends
music  audio 
may 2011 by edavey
AutoFLAC |
AutoFLAC is a script that works in conjunction with Exact Audio Copy to automate the process of backing and restoring your audio CD collection using the FLAC media format. By default, AutoFLAC operates in rip mode, in which it automates the process of backing up a CD to individual FLAC files or a FLAC image. When used in write mode, AutoFLAC will automatically convert the CD back to standard WAVE files and write them to a CD-R using the associated CUE sheet. This CUE sheet allows an exact duplicate to be created in the event the original CD is lost, stolen, or damaged.

AutoFLAC was written with the free, powerful, and open source AutoIt scripting language.
audio  flac  music  eac 
february 2011 by edavey
Wack is an application similar to M.A.R.E.O and was the next logical step after working on Flacattack. Wack allows you to work in conjunction with E.A.C. to create a digital copy of your CD collection. Wack gives you the ability to create multiple copies of your collection using different audio formats, while still only requiring you to rip your CDs one time. You can choose to create image and cuesheet files or individual files for each track using any number of audio formats. A typical situation is one where you would archive your collection using a lossless encoder and then have a lossy encoded copy of your collection for use on a portable device.

Wack is compatible with most encoders including Lame, Musepack, Ogg Vorbis, FAAC, ITunesEncode, Flac, Wavpack, Monkey's Audio, True Audio, OptimFrog, La, Shorten, and possibly others.

The Wack download includes a program called wavsplit created by Tangerine from Hydrogenaudio.
audio  flac  eac 
february 2011 by edavey Audio that moves you
Good listening recommendations are no longer hard to find: Explore, discover and sync to your mobile devices
audio  podcasts  radio  social_networking 
january 2011 by edavey
78rpm Records Conversion
Converting 78rpm shellac records to digital
DJing and Mixing 1920s technology with the state of the art...
audio  78s 
october 2010 by edavey
Audio Circuit Denmark
Hifi and audio equipment manuals.

All categorized Schematics and Service Manuals are up again for
free unlimited download.
audio  amplifier  hifi  electronics 
july 2010 by edavey
nothing to see here...move along...
A free graphic equalizer for all mac sound
Problem – you’re streaming music from some web site (i.e. Pandora) and it could use a little EQ tweaking but your browser doesn’t have an EQ and OS X lacks a system EQ…
mac  audio 
february 2009 by edavey

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