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Appendix C Configuring Audio Input

1. adjust the recording level See Chapter 2 Signal Acquisition Recording for a discussion of how to set the record level properly Do not make changes to the audio input format sample rate number of channels and sample size in Audio MIDI Setup while Raven is running Doing so may result in corrupted recordings in Raven Built in Audio Built in Audio Internal Clock dl weil i Source Internal speakers l Format 44100 0Hz 2ch 16bit ce FL ii ii INS ee tit Figure C 5 The Audio Devices screen in the Audio MIDI Setup pro gram 182 Raven 1 2 User s Manual
2. AppendixC Configuring Audio Input About this appendix This Appendix explains how to use controls provided by your operating system to select and adjust the audio device from which Raven gets its input when acquiring new signals Windows 98 2000 and XP Depending on which version of the Windows operating system you re using the icons and windows you see may appear slightly different from those shown here However the audio input controls function the same way in all versions of Windows To access the Windows audio input and output controls double click on the speaker icon that is displayed in the icon tray in the Windows task bar Figure C 1 PKS ICD 9 03 aM Audio controls Figure C 1 The Windows icon tray Double click on the speaker icon to display the Windows audio input and output controls You may see different icons in the tray depending on how your system is config ured The Volume Control dialog appears Figure C 2 showing the volume and balance settings for various audio output devices To display the controls for audio input devices choose Options gt Properties In the Properties dia log that appears Figure C 3 the Mixer device drop down menu lists all of the sound cards installed in your computer and lets you choose which one to use for audio input On many computers only a single sound card is installed its name may differ from that shown in Figure C 3 Click on Recording check the boxes next to a
3. g in Raven and then use the Windows audio controls to adjust the recording level See Chapter 2 Signal Acquisition Recording for a discussion of how to set the record level properly eI Options Help LD Player Line In Microphone Balance Balance Balance Volume Volume Volume Select Select i Select SigmaTel Audio Figure C 4 The Recording Source controls Controls for different devices may be displayed depending on system configuration Launch the utility program called Audio MIDI Setup located in Applica tions Utilities Audio MIDI Setup is supplied with Mac OS X Click on the Audio Devices tab to display controls for choosing a sound input device and setting the input recording level Figure C 5 For Default Input choose the sound input device that you plan to use with Raven In most cases this will be Built in Audio Under Audio Input left side of window choose the Source to use for input to the audio device In most cases this will be Line In The choices listed for Source correspond to physical input jacks or ports on the computer or external audio device To adjust the recording level move the Volume slider control Changes that you make to the recording level in Audio MIDI Setup are reflected immediately in the signal reaching Raven You can thus start a recorder running in Raven and then use the Audio MIDI Setup controls to Raven 1 2 User s Manual 181 Appendix C Configuring Audio Input
4. ll of the sound input devices that you may want to use on the list of volume controls at the bottom of the dialog box then click OK Raven 1 2 User s Manual 179 Appendix C Configuring Audio Input iok Options Help Volume Control Wave SW Synth LD Player Balance Balance Balance Balance P F o Fel e Falo fa Volume Volume Volume Volume ie ae ale ale eae Mute all Mute Mute Mute SigmaTel Audio Figure C 2 The Windows Volume Control dialog as it s initially dis played showing Playback controls Controls for different devices may be displayed depending on system configuration Miner device Adjust volume for C Playback Recording C Other Mono Out Show the following volume controls L Aus LD Player Line Ini Microphone af Cancel Figure C 3 The Properties dialog for the Windows audio playback and recording devices The Mixer device name on your computer may differ from what s shown here 180 Raven 1 2 User s Manual Mac OS X Appendix C Configuring Audio Input The Volume Control dialog will be replaced by the Recording Source dia log Figure C 4 To choose which recording source will be used check the Select box for that device To adjust the recording level move the Volume slider control Changes that you make in this dialog box are reflected immediately in the signal reaching Raven You can thus start a recorder runnin

Appendix C Configuring Audio Input

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