Amplifiers – With semiconductor amplifying device – Including class d amplifier
Patent
1996-11-20
1999-04-27
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including class d amplifier
330297, 330285, H03F 3217, H03G 310
Patent
active
058983406
ABSTRACT:
An audio amplifier with a digital input bus for both audio (48) and volume (47) level inputs is disclosed. Volume control is achieved by maintaining dynamic voltage supply rails (43) and (44) to an audio output controller block (45) at a fixed ratio of the maximum available supply voltages (40) and (41). This is accomplished by a volume level controller block (42). The audio output controller block accepts digital samples and converts the samples to analog voltages within the range of the volume rail voltages for the purpose of driving a audio frequency loudspeaker (46). Such a system has very high efficiency when compared with older Class A and AB designs and improves the ease of implementation of volume control over Class D designs. The system is easily distinguished from other designs using variable rail voltages because prior art designs used the rail voltage to track the audio output. The present invention varies the rail voltages for the purpose of controlling the volume of the output and as such relatively large voltages may exist between the output and the voltage supply rails. Also the present invention makes use of all digital inputs whereas prior art does not.
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Chatterjee Manjirnath A.
Simon Gregory R.
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