Patent ID: 6115684
Filing Date: 2000-09-05
Classification: G10L

Abstract:
A method of synthesizing a sound,producing an impulse response, based on the product of a phasing component and a spectrum of a source sound, wherein a sound source signal resulting from the phasing component has a power spectrum the same as the impulse and energy distributed in time; andsynthesizing said sound from said source sound by adding up said impulse response while moving said response by a period of interest on the temporal axis;wherein:said phasing component is a product of a first component and a second component,said first component .PHI.(.omega.) is represented as follows: ##EQU18## wherein exp ( ) represents an exponential function, .omega. represents an angular frequency, .xi.(.omega.) represents a continuous odd function, .LAMBDA. represents a set of a finite number of numerals, k represents a single numeral extracted from .LAMBDA., .alpha..sub.k represents a factor, m.sub.k represents a parameter, and .rho.(.omega.) represents a function indicating a weight, andsaid second component is produced by the steps of:obtaining a band-limited random number by convoluting a random number and a band-liming function on the frequency axis;obtaining a group delay characteristic by multiplying said band-limited random number and a target value for fluctuation of delay time;obtaining a phase characteristic by integrating said group delay characteristic by a frequency; andmultiplying said phase characteristic by an imaginary number unit to produce the exponent of a exponential function.