专利名称：Sound synthesizer
发明人：Rosenstrach, Paul A.,Deaett, Michael A.申请号：EP90314403.8申请日：19901228公开号：EP0436397A3公开日：19920902
专利附图：
摘要：A pseudo-random synthesized signal is provided by analysis of a plurality ofrelated signals by vector quantization of linear predictive coding coefficients (clusterrepresentatives) of time blocks of the signals and providing cumulative probabilitymatrices for the transition from one cluster representative for one block to a cluster
representative of the next successive block of each of the signals. Synthesis of thepseudo-random signal is provided by randomly selecting according to a cumulativetransition probability, the cluster representative of a next successive block given theselected cluster representative of the previous block, the coefficient of each block timebeing applied to a noise-excited recursive filter to generate the pseudo-randomsynthesized signal. A timing pulse generator (81) produces a pulse every T milliseconds,where T is the block time. A block number generator (82) in response selects a blockaddress in a sequence in a block memory (83), which causes a pointer (cluster number) fora block K to be read from memory (83) to a cluster coefficient memory (70), andcumulative probabilities to be read to a comparator (62) that compares them with arandom number from a random number generator (63) triggered by the timing pulse.The comparator (82) thereby provides a cluster number and cumulative probability forblock (K+1). The cluster coefficient memory (70) loads an LPC recursive filter (84) withLPC coefficients.
申请人：RAYTHEON COMPANY
地址：141 Spring Street Lexington Massachusetts 02173 US
国籍：US
代理机构：Jackson, David Spence
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