Phoenix Specification

Toy Test Mode
Sampling frequency32 kHz
Speech memory4 Mbit
Coding method4 bit ADPCM
Accuracy1 dB
Maximum level72 dB
Word listMcCormick Toy Test
AlgorithmScoring Algorithm Institute of Hearing Research, MRC
Maximum number of reversals6
Minimum number of toys selected2
Threshold convergence71%
Step size (speech in quiet)12dB homing in, 6 dB test
Step size (speech in noise)6dB homing in, 3dB test
Speech test noisePink noise max freq 15kHz
Calibration noise1 kHz narrow band noise
Warble Tone Mode
Warble tone frequencies

250Hz, 500Hz, 1kHz, 2kHz, 3kHz, 4kHz, 5kHz
Modulation depth10%
Modulation rate10 Hz
Warble tone step size1, 2, 5, 10 dB
Maximum level

72 dB SPL
Minimum level12 dB SPL
Warble tone calibrationdB(a) and dB(spl)