High-Precision Audio Drift and Frequency Measurements on a Budget
Conducting high precision audio drift or audio frequency measurements doesn’t have to be expensive. In this guide, I’m showing you how to do it with an ordinary computer, an audio interface, a GPS receiver, and a little bit of tinkering.
The UA-5 is not the most recent audio interface and therefore not supported by Edirol anymore. Luckily there is a Windows 7 driver available, and since newer Windows versions should be compatible, it is as easy as installing this driver – I always think. Unfortunately, that’s not working, and editing the INF file is cumbersome and requires disabling the driver signature enforcement (which is not recommended).
The solution is actually pretty simple and I found it here: Download the Vista driver, and run setup in Vista compatibility mode. This driver does not constrain the Windows version and works on all versions through Windows 10.
The ITEC MediaPlayer library for Android has been updated to 1.4.0. This new version mainly improves DASH support, but also has a few bugs fixed, small changes and additions to the MediaPlayer/VideoView API, and improved error/exception reporting.
The DASH MPD parser now covers a lot more use cases, including some of the DASH-IF test vectors for which an evaluation protocol is available in the sources. Experimental playback of dynamic content (live streams) is also possible now, but MPD updates are not supported yet. An important feature that is still missing is support of single-segment streams, which is why many of the test vectors still fail. Anyway, the API of the current version should remain stable for some time while all the missing functionality can be implemented under the hood, if interest calls for it. The demo app has also been updated with the new version of the library and a few usability improvements.
The library is available on GitHub, with updated documentation and sources. Release builds can be obtained from the JCenter repository for easy usage in Android projects through Gradle and Maven. The demo app is online on the Play Store.
ITEC MediaPlayer on GitHubI am currently trying to solve licensing issues on an unreleased project I am working on and want to get rid of all dependencies under the GPL, one of which is the libsamplerate resampling library, which I have been using for a few years through a managed .NET wrapper. It is just a small wrapper library but because it proved to be working pretty stable and I also could not find any other nice wrapper as of today, I moved it to a separate project called SRC.NET and published it on GitHub. SRC.NET has been written for stream processing and comes with both x86 and x64 precompiled libsamplerate Windows libraries. Usage is very simple, a small demo application is included in the repository.
SRC.NET Managed LibSampleRate Wrapper on GitHubNew publications section with publisher links, PDF downloads and supplementary stuff.
Local Audio Broadcast is a simple application that captures the local audio playback in Windows and streams it to a UPnP renderer on the network.
I have originally written it to stream Spotify music playback from my desktop to my HTPC running XBMC, therefore it can also embed the currently playing track title from Spotify into the stream. It is not limited to Spotify though, but can stream any audio playback.
Mario