User manual APPLE IMPULSE RESPONSE UTILITY

[. . . ] Impulse Response Utility User Manual Apple Inc. © 2007 Apple Inc. Under the copyright laws, this manual may not be copied, in whole or in part, without the written consent of Apple. Your rights to the software are governed by the accompanying software licence agreement. The Apple logo is a trademark of Apple Inc. , registered in the U. S. [. . . ] To view an audio file in the Editing area: m Select the audio file. Your audio file will automatically appear in the Editing area. You can choose from three different display modes in the Editing area: Â Waveform: Shows the recorded audio as a standard waveform. The horizontal axis displays the elapsed time. The vertical axis displays the audio level as a percentage. Â Energy: Shows the sound energy distribution over time. The horizontal axis displays the elapsed time. The vertical axis displays audio levels in dB. Â Spectrogram: Shows the frequency distribution over time. The horizontal axis displays the elapsed time. The vertical axis displays the frequencies, which are color coded by dB range. The color legend in the upper right corner of the Editing area indicates the color schema. These display modes allow you to effectively analyze your waveforms, making it easy to identify material you need to cut or crop, or that requires a fade. The Spectrogram mode, in particular--which simultaneously shows frequency, level, and time--allows for very detailed analysis of your audio. 17 Transport Buttons The Editing area contains two transport buttons: Â Play: Starts or stops playback of the selected audio track. You can also use the Space bar to start or stop playback. Â Cycle: Engages/disengages Cycle mode. When Cycle mode is engaged (the button is darkened), playback of the selected track repeats continuously. Editing Functions Impulse Response Utility offers three editing functions, accomplished via the two editing buttons at the top left of the Editing window: Cut, Crop, and Fade. All edit functions are accomplished by using the same steps: 1 Click-drag over a portion of the audio in the Editing area. 2 Click the appropriate edit function button. Â Crop: If you make a selection that doesn't extend to either the beginning or end of the audio, the left edit button activates the Crop function. Clicking this button will remove the audio to the right and left of your selection, without touching the selected audio. You can also choose Edit > Crop (or press Command-X) to crop. [. . . ] Set up the Monitor section, sweep generator, and input for the selected track. Step 4: Recording Record-enable the selected track, and click the Sweep button. Impulse Response Utility will prompt you to name and save the new project after your first recording. Swivel the microphone to the second surround position, record-enable the track, and click the Sweep button. [. . . ]