Host-controlled power management of a computer sound system

Details Host-controlled power management of a computer sound system Host-controlled power management of a computer sound system

1996-06-28

1999-03-23

An, Meng-Ai T.

Coded data generation or conversion

Digital code to digital code converters

Tree structure

39575003, 341110, G06F 132

Patent

active

058871772

ABSTRACT:
A power management scheme for the sound system of a computer is flexible, low-cost, and effective, both to minimize power consumption and to avoid any attendant audio artifacts. More particularly, a mix of relatively simple hardware functions are manipulated by host computer software to change the power management state of an audio codes. Because changing the audio codec power management state can cause annoying artifacts to be coupled to the audio outputs, circuitry is provided to preclude these artifacts, switched in concert with the power control circuitry. The rate at which the audio codec's internal analog reference voltage equilibrates when power is applied or removed is controlled. This prevents coupling of a step to the audio outputs, which otherwise would make a large "pop." The rate at which the analog output capacitors are charged when power is applied is also controlled, preventing a "pop" from being coupled to the analog outputs. A programmable current sink is provided to discharge the output coupling capacitors when power is removed. This allows removal of power without annoying artifacts. Further in accordance with the invention, various power management states are defined, and a limit is placed on the allowable amount of "pop" energy deliverable at the audio outputs during a state transition.

REFERENCES:
patent: 5436588 (1995-07-01), Ghaffaripour
patent: 5589830 (1996-12-01), Linz et al.

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