| 摘要 |
An echo canceller capable of suppressing an echo more effectively than the case of performing filter processing by a signal of a fixed-point format while suppressing an increase in cost is provided. An echo canceller 1 includes a floating-point DSP section 10 and a fixed-point DSP section 20. The floating-point DSP section 10 has an FIR filter processing section 12, an adder 14 and a first conversion section 16. The FIR filter processing section 12 generates a pseudo echo signal of a floating-point format, and the adder 14 subtracts the pseudo echo signal from a sound collection signal and generates a first correction signal. The first conversion section 16 converts a first correction signal into the first correction signal of a fixed-point format and adjusts gain of the first correction signal. The fixed-point DSP section 20 has an FIR filter processing section 21 and an adder 22. The FIR filter processing section 21 generates a pseudo echo signal of a fixed-point format, and the adder 22 subtracts the pseudo echo signal from a first correction signal converted into a fixed-point format and generates an output signal.
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