发明名称 AUDIO SIGNAL CIRCUIT
摘要 PURPOSE:To prevent production of noise sound at changeover by decreasing an intensity level momentarily and increasing gradually under a required time constant when the audio intensity level is switched from a low to a high level through the provision of a buffer means. CONSTITUTION:An audio signal outputted from a speaker 4 is switched to a low level or a high level by a changeover means 2 in response to a switching signal from a switching signal generating circuit means 1. When the low level is switched into the high level, the audio signal switched to the strong level is reduced momentarily by a buffer means 3 and the level is increased under a prescribed time constant. Thus, even when the intensity level is switched from the low level to the high level, production of sound noise is prevented.
申请公布号 JPH04314300(A) 申请公布日期 1992.11.05
申请号 JP19910079827 申请日期 1991.04.12
申请人 FUJITSU TEN LTD 发明人 OSUMI TATSUYA
分类号 H04R3/00 主分类号 H04R3/00
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