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Determining a masking level for a subband in a subband audio encoder
| Details |
Inventors: Fiocca, James L.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Knepper; David D.
Assistant Examiner:
Attorney, Agent or Firm: Stockley; Darleen J.
The first step for calculating a signal-to-mask ratio (806) for a subband in a subband in a subband audio encoder is calculating a signal level for each of the subbands based on an audio frame (604). Then, the masking level is calculated for the particular subband based on the signal levels, an offset function, and a weighting function (606). |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT The present invention provides a method, a device, and systems for determining a masking level for a frequency subband in a subband audio encoding system using less memory and requiring less complexity.
The first step is determining a signal level for each of the subbands based on an audio frame.
Then, the masking level is calculating for a subband based on the signal levels, an offset function, and a weighting function.
With the present invention, the masking levels for the subbands in the subband audio encoder are efficiently calculated.
The present invention is more fully described with reference to FIGS.
1-6.
FIG.
1, numeral 100, is a flow diagram for implementing a method for determining a masking level for a subband in a subband audio encoder in accordance with the present invention.
The method is generally implemented in a psychoacoustic unit.
First, the audio frame (e.
g.
, pulse code modulated (PCM) audio) is received and a signal level is determined for each subband, based on the audio frame (102).
Then, the masking level is calculated for a particular subband, based on the signal levels, an offset function, and a weighting function (104).
FIG.
2, numeral 200, is a flow diagram, shown with greater detail, of the step of determining a signal level for each subband using a filter bank in accordance with the present invention.
The filter bank is used to filter the audio frame to produce one or more subband samples for each subband (202).
The signal level is calculated (204) by summing the squares of each of the subband samples for the given subband, and then taking the logarithm (base 10) of the result.
The resulting signal level is a very reliable measure of the relative energy (in decibels) of each subband in a given audio frame.
The subband samples are the output of a filter bank.
The number of samples per subband which the filter bank outputs is a function of the frame size of the audio encoder.
This method of signal level calculation is very low complexity, as it does not involve an additional frequency transformer
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