Abstract
To facilitate study of dichotic speech perception, a computer-controlled PCM system has been devised for preparation of dichotic tests from natural speech. A test is a series of paired utterances, presented one at each ear, simultaneously or with interaural delay. In compiling a test, each of several tape-recorded utterances is digitized at a 8-kHz rate (10 bits/sample) and read into computer memory. The stored utterance is played back, and its waveform simultaneously displayed on a storage oscilloscope. The experimenter defines the exact beginning and end of the utterance and adjusts its intensity. The edited utterance is saved with others on a disk file. According to the experimenter's test order, the two utterances of each pair are retrieved, converted with a specified relative delay, and recorded each on a separate audio tape track. The system is a useful tool for investigation of lateralization and fusion in speech perception. [Support from the Office of Naval Research and the National Institute of Health (NICHD) is acknowledged.]
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