System and method to reduce audio artifacts from an audio signal dispersed among multiple audio channels by reducing the order of each control loop by selectively activating multiple integrators located within each control loop
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United States of America Patent
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N/A
Issued Date -
Jan 3, 2008
app pub date -
Jun 30, 2006
filing date -
Jun 30, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention has been described in the context of a system and method of removing artifacts from an audio signal during shutdown of the output. The system includes a means by which the average value may be found to be zero or sufficiently close to zero as determined by the resolution of the filter output and a means by which the filter average value being zero or close to zero is used to disconnect (or equivalently change impedance or power) of the device or devices rendering the PWM signal into the analog domain as may be implemented by a Class D bridge chip and disconnection means. The invention further includes a means by which channels are in succession compared to prior channels and switched to share the fixed output signal and a means by which upon finding the last channel is at the zero average value in synchrony with the prior channel or channels the output of the entire group of channels may be simultaneously disconnected.
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