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Schematic diagram of a pure tone (Upper) and a transposed tone (Lower). The transposed tone is generated by multiplying a high-frequency sinusoidal carrier with a half-wave rectified low-frequency sinusoidal modulator. As a first-order approximation, the peripheral auditory system acts as a half-wave rectifier (HWR) and low-pass filter (LPF), so that the temporal representations of both the low-frequency (LF) pure tone and the high-frequency (HF) transposed tone are similar.
