| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an echo canceler that can be configured to more effectively suppress an echo, with the suppression of increase in costs, than a case of filter processing carried out by a signal in the fixed point form. <P>SOLUTION: An echo canceler 1 includes a floating point DSP unit 10 and a fixed point DSP unit 20. The floating point DSP unit 10 is comprised of an FIR filter processing unit 12, an adder 14 and a first converting unit 16. The FIR filter processing unit 12 generates a pseudo echo signal in the floating point form and the adder 14 subtracts the pseudo echo signal from a collected sound signal to generate a first correction signal. The first converting unit 16 converts the first correction signal into the one in the fixed point form for the adjustment of a gain. The fixed point DSP unit 20 is comprised of a FIR filter processing unit 21 and an adder 22. The FIR filter processing unit 21 generates a pseudo echo signal in the fixed point form, and the adder 22 subtracts the pseudo echo signal from the first correction signal converted into the fixed point form to generate an output signal. <P>COPYRIGHT: (C)2009,JPO&INPIT |
