Portable computer system having and a method for an audio expans

Details Portable computer system having and a method for an audio expans Portable computer system having and a method for an audio expans

1997-10-27

2000-11-14

Sheikh, Ayaz R.

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

710102, 700 94, G06F 1300

Patent

active

061483532

ABSTRACT:
An audio expansion system for enhancing sound reproduction function of the portable computer includes a digital audio processing chip, a first audio amplifier provided in the portable computer and a second audio amplifier provided in the docking station. These two amplifiers amplify the audio output signal fed from the audio chip. A controller is provided for detecting the presence of the docking station, and in response thereto outputs a signal which disables the first audio amplifier. This controller activates a switch that turns off the first audio amplifier. Also, the presence of the docking station is determined by a signal having a voltage level representative of the presence of said second audio amplifier. Thus, a simple audio processing circuit is provided so as to eliminate the duplicated audio chip in the docking station. Further, by detecting the presence of the docking station, automatic turn off of the host audio amplifier is possible, thereby providing a stable control system without using a software control program.

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