| 摘要 |
PURPOSE:To remove noise components from a sound signal, to take a sound analysis, and to improve the sound quality by amplifying the sound signal from a microphone by an amplifier in sound recording operation and then passing it through a band-pass filter. CONSTITUTION:When sound recording or reproduction is performed, the band- pass filter 3 is interposed between the output of the amplifier 2 and a sound analyzing device 4 in sound recording operation and the sound signal from which noise components are removed is coded by a voice analyzing device 4 and stored on a random-access memory 5. In the reproducing operation, the band-pass filter 3 is interposed between a DA converter 8 and an amplifier 7 for driving a speaker 6 to remove the factors of noises of the synchronizing signal component of a DA converter 8, etc. Consequently, the sound quality is improved. |
