Low-voltage driven, audio signal amplifying apparatus and a portable acoustic system using said apparatus
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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Abstract
The apparatus includes 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 are provided in the respective output stage amplifiers for reducing the amount of low-band negative feedback. Switch circuits are turned on in response to feedback signals from the respective negative feedback circuits for supplying the feedback signals at the input to the output stage amplifiers.
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Citations
8 Claims
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1. A low-voltage driven, audio signal amplifying apparatus which comprises:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A portable acoustic apparatus comprising:
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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 to respective negative feedback inputs of said output stage amplifiers; and speakers provided in correspondence to the left and right channels for receiving the respective outputs from 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. - View Dependent Claims (8)
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Specification