Title:
PULSE CODE MODULATION PASSBAND FILTER AND METHOD FOR OBTAINING MULTIPLE FILTER PASSBANDS
Document Type and Number:
WIPO Patent Application WO/2020/043072
Kind Code:
A1
Abstract:
A 1st frequency reduction circuit of a filter of the invention downsamples the sampling rate of a signal source to a predetermined value to obtain a 1st PCM stream, a 1st frequency raising circuit raises the sampling rate of the 1st PCM stream to be the same as that of the signal source, a 1st delay circuit delays a stream of the signal source, such that its phase is the same as that of the 1st PCM stream, a 1st adder subtracts the frequency raised 1st PCM steam from the delayed stream of the signal source to obtain a passband 1, a j-th frequency reduction circuit downsamples the sampling rate of a (j-1) -th PCM stream to a predetermined value to obtain a j-th PCM stream, wherein 2≤j≤n, a j-th frequency raising circuit raises the sampling rate of the j-th PCM stream to be the same as that of the (j-1) -th PCM stream, a j-th delay circuit delays the (j-1) -th PCM stream, such that its phase is the same as that of the j-th PCM stream, a j-th adder subtracts the frequency raised j-th PCM stream from the delayed (j-1) -th PCM stream to obtain a passband j, and when j=n, the j-th PCM stream is a passband n+1.
Inventors:
LI YUI HUNG (CN)
Application Number:
PCT/CN2019/102663
Publication Date:
March 05, 2020
Filing Date:
August 27, 2019
Export Citation:
Assignee:
LI YUI HUNG (CN)
International Classes:
H04B14/04
Domestic Patent References:
| WO2017053447A1 | 2017-03-30 |
Foreign References:
| EP1970902A2 | 2008-09-17 | |||
| US20080159551A1 | 2008-07-03 | |||
| US4882638A | 1989-11-21 |
Other References:
NAOYA TAKAHASHI ET AL.: "MULTI-SCALE MULTI-BAND DENSENETS FOR AUDIO SOURCE SEPARATION", 2017 IEEE WORKSHOP ON APPLICATIONS OF SIGNAL PROCESSING TO AUDIO AND ACOUSTICS, 18 October 2017 (2017-10-18), XP080773427
Attorney, Agent or Firm:
CHINA PATENT AGENT (H.K.) LTD. (CN)
Download PDF:
Previous Patent: DOUBLE-SIDED PLANER FOR VERTICAL PLANING
Next Patent: ANNULAR BEARER NETWORK AND SERVICE BEARING IMPLEMENTATION METHOD THEREFOR
Next Patent: ANNULAR BEARER NETWORK AND SERVICE BEARING IMPLEMENTATION METHOD THEREFOR