Coded data generation or conversion – Digital code to digital code converters – To or from differential codes
Patent
1992-03-27
1993-12-07
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from differential codes
381 30, H03H 732
Patent
active
052686850
ABSTRACT:
A digital input signal is divided into signal components in plural frequency ranges by band division filters. The signal components thus obtained are divided in time into signal components in blocks in the respective frequency bands, and are also sent to a transient detector, which determines a transient state for each blocks. Changing an allowed noise level calculating circuit in response to the determined transient states, or any similar method, alters the quantizing bit numbers allocated to each block by an adaptive bit allocation circuit. The allocated bit numbers are altered depending upon the transient state of each block to improve the signal-to-noise ratio in blocks including a transient. Quantizing noise pre echo occurring before the transient, a phenomenon that is offensive to the ear, is prevented.
REFERENCES:
patent: 5105463 (1992-04-01), Veldhuis et al.
patent: 5109417 (1992-04-01), Fielder et al.
patent: 5115240 (1992-05-01), Fujiwara et al.
patent: 5142656 (1992-08-01), Fielder et al.
patent: 5151941 (1992-09-01), Nishiguchi et al.
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