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Low-voltage driven, audio signal amplifying apparatus and a portable acoustic system using said apparatus

  • US 5,610,555 A
  • Filed: 08/15/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 08/18/1994
  • Status: Expired due to Term
First Claim
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1. A low-voltage driven, audio signal amplifying apparatus which comprises:

  • output stage amplifiers for receiving the respective outputs of preamplifiers provided in correspondence to the left and right channels in a stereo system;

    negative feedback circuits connected respectively to respective outputs of the output stage amplifiers for reducing the amount of low-band negative feedback; and

    switch circuits which are turned on to supply respective feedback signals from the respective feedback circuits to respective negative feedback inputs of said output stage amplifiers;

    whereinsaid switch circuits are turned on simultaneously, thereby allowing said output stage amplifiers to perform emphasis on the low-band frequency.

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