Scale factor based bit shifting in fine granularity scalability audio coding
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 17, 2009
Grant Date -
Jan 13, 2005
app pub date -
Nov 18, 2003
filing date -
Jul 8, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
One embodiment of the present invention provides a method coding audio signals in a base layer and an enhancement layer comprising the steps of quantizing the audio signals in spectral lines into quantized data in a plurality of sub-bands in an order of most significant bits (MSBs) to least significant bits (LSBs), determining a plurality of scale factors corresponding to each of the sub-bands according to respective noise tolerance of each of the sub-bands, bit shifting the quantized data in the sub-bands by the respective scale factor if they exceed a threshold value, coding the quantized data in the base layer, coding the quantized data in the enhancement layer, truncating the quantized data in the enhancement layer up to respective layer size limits, de-shifting the coded data wit the respective scale factors, de-quantizing the coded data, and decoding the coded data.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully