Patent ID: 6278974
Filing Date: 2001-08-21
Classification: G10L

Abstract:
A speech synthesizer comprising:a sampled signal storing device therein a sample signal and outputting said sampled signal in response to an input signal; anda speech signal synthesizing circuit electrically connected to said sampled signal storing device, receiving an operation signal, having said sampled signal outputted by said sampled signal storing device to be repeatedly operated M times in response to said operation signal, and then outputting a speech synthesized signal, wherein a frequency of said operation signal is M times of a frequency of said input signal to allow said sampled signal to be repeatedly operated M times during a single cycle of said input signal, wherein said sampled signal is operated according to operation equations (b) and (c) listed below:A(t+1/M)=A(t)+f1(Q(t))Di=A(t)+Aij (b),andQ(T+1/M)=Q(t)+f2(Q(t),Di) (c),whereinA(t) is an amplitude of said speech synthesized signal at a variable time t;A(t+1/M) is an amplitude of said speech synthesized signal at a variable time (t+1/M);Q(T) is a quantization step of said sampled signal at said variable time t;Q(t+1/M) is a quantization step of said sampled signal at said variable time (t+1/M);M is a predetermined converting parameter;f1(Q(t)) is an amplitude magnitude function of Q(t);f2(Q(t)), Di) is a quantization-step differential function of Q(t) and Di;Di is an amplitude of the ith sampled signal stored in said sampled signal storing device; andAi j is an amplitude magnitude of said ith sampled signal after said sampled signal is processed j times where in 1.ltoreq.j.ltoreq.M.