Discrimination of Changes in Complex Auditory Stimuli
Discrimination of Changes in Complex Auditory Stimuli
Raney, Jill Johnson
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The interference amounts were determined as in previous tables (i.e., signal alone minus signal plus masker) . For ease of comparison, the 10-Hz data previously discussed are also included. Table 4-4 Average Amounts of Interference (dB) for Each Waveform Condition and Envelope Modulation Rate. The Signal Frequency Was 1000 Hz and the Masker Frequency Was 4000 Hz. SIGNAL/MASKER CONDITION ENVELOPE 10 Hz MODULATION 40 Hz RATES 160 Hz AM/ AM 13.6 7.0 11.7 BEAT/ BEAT 6.7 8.2 7.5 BEAT/AM 9.3 9.3 8.8 ...AM/ BEAT AVG 12.5 6.0 8.3 10.5 dB 7.6 dB 9.1 dB 82 It appears from the data that our expectation of a decrease in the interference amount with an increase in modulation rate was not fulfilled. One possible problem may be that we did not increase the envelope modulation to a high enough rate. As the results discussed in Chapter 5 will indicate, it is possible that a rate of 320 Hz may be necessary for detection to be based primarily on spectral cues. Frequency Relation Between Signal and Masker As we mentioned, Yost and Sheft (1989) used freguencies for their signal and masker that were multiples of each other.
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