| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a voice signal amplifier for adding the echo to original voice, amplifying the voice to output it from a speaker and suppressing occurrence of howling caused by adding the echo in which a means for adding an echo is simple and which is simply manufactured and adjusted. <P>SOLUTION: The voice signal amplifier makes a level detector 10 detect a level of an electric signal concerning the voice input from a microphone 3, when a detected value is larger than a preset value for probably causing the howling, regards that the voice from the speaker 17 is amplified by feeding back to the microphone 3 and performs control so that the content of a delay signal from a delay circuit 7 is changed so as to avoid that the same voice is continuously picked up by the microphone 3 by a control means 11. <P>COPYRIGHT: (C)2007,JPO&INPIT |
