Method for expanding audio signal bandwidth

Details Method for expanding audio signal bandwidth Method for expanding audio signal bandwidth

2007-08-13

2011-10-18

Armstrong, Angela A (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

Reexamination Certificate

active

08041577

ABSTRACT:
A method expands a bandwidth of an audio signal by determining a magnitude time-frequency representation |G(ω, t) for example audio signals g(t). A set of frequency marginal probabilities PG(ω|z)221are estimated from |G(ω, t)|, and a magnitude time-frequency representation |X(ω, t)| is determined from an input signal audio signal x(t). Probabilities P(z), PX(z) and PX(t|z) are determined using PG(ω|z)|X(ω, t)|. |Ŷ(ω, t)| is reconstructed according to PzPX(z)PG(ω|z)PX(t|z), and |Ŷ(ω, t)| is transformed to a time domain to obtain a high-quality output audio signal ŷ(t) corresponding to the input audio signal x(t).

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