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Audio recording synchronization
Let us consider the following experiment setup: Physiological data is being recorded while the subject is involved in a conversation. The experimenter needs to know the physiological reaction at the exact time of certain parts of the conversation.
Take the audio output from the computer and split it with a Y-cable, thus sending the signal both to the speakers and the front of the UIM100C (or the HLT100C via INISO if optical isolation needs to be maintained, i.e. if the subject is connected to electrodes). Use a mono Y-splitter. The plugs on the front of the UIM100C are 3.5 mm mono phone plugs (as well as the inputs of the INISO when used with the HLT100C). Let us assume the audio is plugged into channel 5 of the UIM100C (or the HLT100C). Make sure this channel is not used by another amplifier. Enable channel 5 in the Acqknowledge software and acquire the sound. The higher the sample rate the better you will be able to capture the sound (for example, a 40 000Hz sample rate would capture the entire range of human hearing.) But even at sample rates lower than 1000 Hz it is possible to pick up the sound as noise which will serve fine as a marker.
It is probably best to use a loud sound as a marker at the beginning of the recording so that it can be easily recognized in the Acqknowledge recording and in the audio recording. After the data is acquired, it is possible to bind the sound recording (in a .wav file format) to the Acqknowledge recording in the same way that video can be bound to the Acqknowledge recording. Consult the section on Playback under the Video chapter in the Acqknowledge software guide. A wav file can be played back as long as the user type in *.* for the playback file name in order to see all the files and choose the wav file (this is necessary because it does not have an avi or mpeg extension, which are the default file types).
Associated Applications: Amplifiers & Interfaces, MER: Micro-electrode Recording, EGG: Electrogastrogram, EEG: Electroencephalography, ERS: Evoked Response, Psychophysiology, Magnetic Resonance Imaging - MRI Compatible, ICG: Impedance Cardiography/Cardiac Output, Sleep Studies, ECG: Cardiology, Cardiovascular Hemodynamics, Noninvasive Blood Pressure Monitoring, Virtual Reality, In-vitro Pharmacology, Laser Doppler Flow, EOG: Eye Movement, Plethysmography, Pulmonary Function, Exercise Physiology, EMG: Electromyography, Biomechanics, Remote Monitoring
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