Method and apparatus for level control in blending an audio signal in an in-band on-channel radio system
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United States of America Patent
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Sep 5, 2017
Grant Date -
Jun 22, 2017
app pub date -
Dec 18, 2015
filing date -
Dec 18, 2015
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Abstract
A method for processing a digital audio broadcast signal includes: separating an analog audio portion and a digital audio portion of the digital audio broadcast signal; determining the loudness of the analog audio portion and the digital audio portion over a first short time interval; using the loudness of the analog and digital audio portions to calculate a short term average gain; determining a long term average gain; converting one of the long term average gain or the short term average gain to dB; if an output has been blended to digital, adjusting a digital gain parameter by a preselected increment to produce a digital gain parameter; if an output has not been blended to digital, setting the digital gain parameter to the short term average gain; providing the digital gain parameter to an audio processor; and repeating the above steps using a second short time interval.
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