D/A conversion method and apparatus
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorDaniel Strinnholm
Life of this patent
Estimating the term…
Abstract
A D/A conversion system includes means (18) for arranging a stream of digital samples into frames, each frame including a guard time period. Means (52) are provided for determining a measure of the overall magnitude of digital samples in each frame. Means (50) increase the magnitude of all samples of frames that have a measure that falls below a predetermined threshold by shifting the samples a common number of bits. A D/A converter converts frames with shifted and frames with unshifted samples. An attenuator (54) attenuates the D/A converted samples of frames with shifted samples to compensate for the magnitude increase.
Claims11
A D/A conversion method, including the steps of:
- arranging a stream of digital samples into frames, each frame including a guard time period;
- determining a measure of the overall magnitude of digital samples in each frame;
- increasing the magnitude of all samples of frames that have a measure that falls below a predetermined threshold by shifting the samples a common number of bits;
- D/A converting frames with shifted and frames with unshifted samples;
- and
- attenuating the d/a converted samples of frames with shifted samples to compensate for the magnitude increase:
A D/A conversion method, including the steps of:
- arranging a stream of digital samples into frames, each frame including a guard time period;
- determining a measure of the overall magnitude of digital samples in each frame;
- decreasing the magnitude of all samples of frames that have a measure that exceeds a predetermined threshold by shifting the samples a common number of bits;
- D/A converting frames with shifted and frames with unshifted samples;
- and
- amplifying the D/A converted samples of frames with shifted samples to compensate for the magnitude decrease.
A D/A conversion apparatus, including:
- means for arranging a stream of digital samples into frames, each frame including a guard time period;
- means for determining a measure of the overall magnitude of digital samples in each frame;
- means for increasing the magnitude of all samples of frames that have a measure that falls below a predetermined threshold by shifting the samples a common number of bits;
- a D/A converter for converting frames with shifted and frames with unshifted samples;
- and
- means for attenuating the D/A converted samples of frames with shifted samples to compensate for the magnitude increase.
A D/A conversion apparatus, including:
- means for arranging a stream of digital samples into frames, each frame including a guard time period;
- means for determining a measure of the overall magnitude of digital samples in each frame;
- means for decreasing the magnitude of all samples of frames that have a measure that exceeds a predetermined threshold by shifting the samples a common number of bits;
- a D/A converter for converting frames with shifted and frames with unshifted samples;
- and
- means for amplifying the D/A converted samples of frames with shifted samples to compensate for the magnitude decrease.
A digital subscriber line system, including:
- means for arranging a stream of digital samples into frames, each frame including a cyclic prefix;
- means for determining a measure of the overall magnitude of digital samples in each frame;
- means for increasing the magnitude of all samples of frames that have a measure that falls below a predetermined threshold by shifting the samples a common number of bits;
- a D/A converter for converting frames with shifted and frames with unshifted samples;
- and
- means for attenuating the D/A converted samples of frames with shifted samples to compensate for the magnitude increase.
A digital subscriber line system, including:
- means for arranging a stream of digital samples into frames, each frame including a cyclic prefix;
- means for determining a measure of the overall magnitude of digital samples in each frame;
- means for decreasing the magnitude of all samples of frames that have a measure that exceeds a predetermined threshold by shifting the samples a common number of bits;
- a D/A converter for converting frames with shifted and frames with unshifted samples;
- and
- means for amplifying the D/A converted samples of frames with shifted samples to compensate for the magnitude decrease.
Dependencies are inferred from the claim text.