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专利名称：Simplified digitization of PC beep signal for
audio codec
发明人：Jonathan Herman Fischer,Donald Raymond
Laturell
申请号：US074492申请日：19971119公开号：US06263304B1公开日：20010717
专利附图：
摘要：An improvement to split-architecture audio codecs such as those defined by theAudio Codec '97 specification (AC '97) includes a simulated analog-to-digital (A/D)
digitization of the PC beep signal from a personal computer (PC). A PC beep simulatedA/D digitization circuit simulates the A/D conversion of the PC beep signal. The PC beepsimulated A/D digitization circuit eliminates the need for a pre-amplifier, and reduces thedesign complexity and power consumption otherwise necessary for an A/D converter, byoutputting either of two simulated A/D converter values corresponding respectively to aconversion of the HIGH and LOW logic levels of the PC beep signal. The simulated A/Dconverter output signal from the PC beep simulated digitization circuit is subsequentlyscaled and summed with the digital signals from other audio sources, and output fromthe audio codec.
申请人：AGERE SYSTEMS GUARDIAN CORP.
代理人：William H. Bollman
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