The Windows Logo Program (WLP) imposes detailed requirements on the audio performance of PCs and notebook computers using the Windows Vista operating system. One of these audio performance requirements is crosstalk. This discussion highlights the new design challenges engineers are faced with when designing a system to meet Vista crosstalk requirements. A simple design solution is also proposed. Furthermore, although this crosstalk discussion is targeted at WLP compliance standards, the cause and effect of crosstalk is universal to all audio applications.
The crosstalk specification for Microsoft's Windows Vista OS poses new challenges when compared to historic audio performance requirements and test conditions. Rather than enforcing crosstalk performance at 1 kHz and 10 kHz, WLP enforces crosstalk performance across the full audio band (20 Hz to 15 kHz). Additionally, WLP specifies crosstalk performance into a 32 Ω headphone load. This is a large contrast to the historic 10 kΩ test-load condition. .
This article, by Kymberly Christman (Schmidt) of Maxim Integrated Products Inc. looks at the Vista requirements and how the design and layout of the headphone jack's ground-return path affects meeting these standards. .
To read the article, click here.