Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Reexamination Certificate
2006-05-19
2010-10-12
Ensey, Brian (Department: 2614)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
C381S312000
Reexamination Certificate
active
07813518
ABSTRACT:
The invention relates to a method of current management in a battery powered audio device. According to the invention the method comprises the following steps:a—comparing the actual supply voltage from the battery with a fixed reference voltage,b—generating a control signal whenever the supply voltage is below the reference voltage,c—use the control signal to reduce the load current in the battery powered device, whereby the supply voltage from the battery will increase,d—repeat steps a, b and c whenever the supply voltage is below the reference voltage, and register the rate at which the sequence of steps are repeated, ande—activate an AGC to decrease the output level whenever repetition rate of the a, b and c steps is above a predetermined level.
REFERENCES:
patent: 5838807 (1998-11-01), Andersson et al.
patent: 6453051 (2002-09-01), Killion
patent: WO-2004/034073 (2004-04-01), None
Andersen Marinus
Danielsen Finn
Birch & Stewart Kolasch & Birch, LLP
Ensey Brian
Oticon A/S
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