Audio Delay Finder Audio delay finder that measures the signal delay between two audio input channels
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Audio Delay Finder Description

Audio delay finder that measures the signal delay between two audio input channels Here is an example of how the Audio Delay Finder (ADFB) works: it compares the signal delay between music fed to a loudspeaker system and the signal from a microphone, placed some distance away from the loudspeaker. This information is useful for time-alignment of auxiliary loudspeaker systems, so that sound arrival times from the primary and auxiliary systems can be made coincident, as is done in sound reinforcement applications.In the absence of signal coloration and strong reflections from surfaces, ADFB will display a principal peak corresponding to the sound propagation delay between loudspeaker and microphone. (Nonlinear phase response, reflections from surfaces, etc. will contribute other peaks). For example, with a microphone placed 20 feet from a loudspeaker, the signal driving the loudspeaker fed to Macintosh sound input channel 1 and the signal from the microphone directed to channel 2, ADFB would show a principal peak at 18.18 milliseconds (presuming nominal sound propagation velocity of 1100 feet / second; affected by atmospheric pressure, humidity, etc.)Also note that the ADFB response plot represents the impulse response of the system under test. Here are some key features of "Audio Delay Finder": · Measures interchannel (channel 2 vs. channel 1) time delay: positive (lagging), negative (leading) or both. · Set-up of professional sound reinforcement systems, determine nature of stereo reverb / delay effects, etc. · Works with audio signals (from sound input port, played from QuickTime sound file, internal CD-ROM). · Delay measurement range: 0 to 1.5 seconds. · Delay measurement resolution over entire range: better than 23 microseconds (about 0.30 inches / 0.77 cm for standard atmospheric sound propagation velocity). · Linear or logarithmic time scale for plotting delay significance vs. time (lag or lead). · Delays shorter than a selectable threshold can be excluded from the measurement. · Includes peak-responding, bargraph type input level meters. · Multithreaded application, maintains computer responsiveness. · On-line help is provided. Requirements: · Needs 7 MB free RAM for launch.

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