Data reproduction apparatus and data reproduction method
First Claim
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1. A data reproduction apparatus comprising:
- arithmetic means for calculating difference data that indicate a difference between left-channel and right-channel data that have been compressed in a predetermined compression format;
higher harmonic component generation means for generating a higher harmonic component, which was lost during compression, by performing, when the difference data'"'"'s signal level exceeds a predetermined threshold, a digital limiter process that suppresses the signal level to the threshold; and
adding means for adding the higher harmonic component to the left-channel and right-channel data to reproduce original data before being compressed.
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Abstract
A data reproduction apparatus includes: arithmetic means for calculating difference data that indicate a difference between left-channel and right-channel data that have been compressed in a predetermined compression format; higher harmonic component generation means for generating a higher harmonic component, which was lost during compression, by performing, when the difference data'"'"'s signal level exceeds a predetermined threshold, a digital limiter process that suppresses the signal level to the threshold; and adding means for adding the higher harmonic component to the left-channel and right-channel data to reproduce original data before being compressed.
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Citations
9 Claims
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1. A data reproduction apparatus comprising:
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arithmetic means for calculating difference data that indicate a difference between left-channel and right-channel data that have been compressed in a predetermined compression format; higher harmonic component generation means for generating a higher harmonic component, which was lost during compression, by performing, when the difference data'"'"'s signal level exceeds a predetermined threshold, a digital limiter process that suppresses the signal level to the threshold; and adding means for adding the higher harmonic component to the left-channel and right-channel data to reproduce original data before being compressed. - View Dependent Claims (2, 3, 4)
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5. A data reproduction method comprising:
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a difference calculation step of calculating, by using arithmetic means, difference data that indicate a difference between left-channel and right-channel data that have been compressed in a predetermined compression format; a higher harmonic component generation step of checking if the signal level of the difference data exceeds a predetermined threshold, and generating a higher harmonic component, which was lost during compression, by performing a digital limiter process of higher harmonic generation means that suppresses the signal level to the threshold when the signal level exceeds the threshold; and a reproduction step of adding, by using predetermined adding means, the higher harmonic component to the left-channel and right-channel data to reproduce original data before being compressed. - View Dependent Claims (6, 7, 8)
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9. A data reproduction apparatus comprising:
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an arithmetic section that calculates difference data that indicate a difference between left-channel and right-channel data that have been compressed in a predetermined compression format; a higher harmonic component generation section, including a processor, that generates a higher harmonic component, which was lost during compression, by performing, when the difference data'"'"'s signal level exceeds a predetermined threshold, a digital limiter process that suppresses the signal level to the threshold; and an adding section that adds the higher harmonic component to the left-channel and right-channel data to reproduce original data before being compressed.
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Specification