| 摘要 |
PROBLEM TO BE SOLVED: To process a speech signal to easy-to-hear tone quality, by adding to an input signal, harmonic components according to the level of a signal component in a period included in a power increase section of the input signal. SOLUTION: A speech signal processor is equipped with an attack detector 21 which finds a difference signal between a first signal and a second signal, the first signal following up a rise of a time-directional envelope, with respect to the absolute value of the input signal at a first time constant and falling at a second time constant larger than a first time constant during a fall and the second signal following the rise at a third time constant which is larger than the first time constant and smaller than the second time constant, and falling at the second time constant during the fall; an envelope generator 22 which removes a high-frequency component of the difference signal, to generate a signal of an attachment component; a harmonic generator 26 which generates harmonic components for the input signal and performs band limiting of a predetermined frequency and generates harmonic components; a VCA 27 which amplifies the harmonic component according to the level of a detected attach component. An adder 29 adds the amplified harmonic components to the input signal and outputs the resulting signal. COPYRIGHT: (C)2008,JPO&INPIT
|
