Title:
SUB-BAND DIVISION SYSTEM
Document Type and Number:
Japanese Patent JP2778324
Kind Code:
B2
Abstract:
PURPOSE: To reduce the non-linearity of an impulse reponse by making a filter coefficient reverse by means of a hierarchy in a system which hierarchically uses two division sub-band filter banks and divides them into sub-bands.
CONSTITUTION: The two division sub-band filter banks 50-1, 50-b and 50-a are hierarchically used and they are divided into the multiple sub-bands. The same low pass filter and high pass filter are used in all the two division filter banks 50, and the coefficient order of the filters is made reverse by the hierarchy. When the filter whose filter coefficient is made reverse is put on the bank 50-b after the non-linear filter is put on the bank 50-a, the non-linearity of a phase is cancelled. Thus, the non-linearity of the final impulse response can be suppressed by making the order of the filter coefficient reverse by the hierarchy.
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Inventors:
OOTA MUTSUMI
SENDA JUZO
SENDA JUZO
Application Number:
JP1042992A
Publication Date:
July 23, 1998
Filing Date:
January 24, 1992
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H03H17/02; G06T9/00; H03H17/00; H03M7/30; H04J1/00; H04N7/24; H04N19/00; H04N19/635; H04N19/80; (IPC1-7): H04J1/00; G06T9/00; H03H17/02; H03M7/30; H04N7/24
Domestic Patent References:
| JP60197009A | ||||
| JP3244210A | ||||
| JP420114A | ||||
| JP4345221A |
Attorney, Agent or Firm:
Yoshiyuki Iwasa
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