KR970066881A - Filtering method of subband filter - Google Patents

Filtering method of subband filter Download PDF

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Publication number
KR970066881A
KR970066881A KR1019960008051A KR19960008051A KR970066881A KR 970066881 A KR970066881 A KR 970066881A KR 1019960008051 A KR1019960008051 A KR 1019960008051A KR 19960008051 A KR19960008051 A KR 19960008051A KR 970066881 A KR970066881 A KR 970066881A
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KR
South Korea
Prior art keywords
filtering method
calculating
variable
subband filter
following equation
Prior art date
Application number
KR1019960008051A
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Korean (ko)
Inventor
김효진
Original Assignee
구자홍
Lg 전자주식회사
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Publication date
Application filed by 구자홍, Lg 전자주식회사 filed Critical 구자홍
Priority to KR1019960008051A priority Critical patent/KR970066881A/en
Publication of KR970066881A publication Critical patent/KR970066881A/en

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Abstract

본 발명은 서브밴드 필터의 필터링 방법에 관한 것으로, 종래의 필터는 메모리의 사이즈가 크고 계산량이 많은 문제점이 있었다. 본 발명이 이러한 종래의 문제점을 해결하기 위해 서브밴드 필터 구성시 최적화된 알고리즘과 계산량을 도출하여 메모리의 삭제 또는 메모리 사이즈를 줄일 수 있는 서브밴드 필터의 필터링 방법을 창안한 것이다.The present invention relates to a filtering method of a subband filter, and a conventional filter has a problem that a size of a memory is large and a calculation amount is large. In order to solve such a conventional problem, the present invention has been devised a filtering method of a sub-band filter which can reduce memory size or memory by deriving an optimized algorithm and calculation amount in a sub-band filter configuration.

Description

서브랜드 필터의 필터링방법Filtering method of brand name filter

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제1도는 일반적인 서브밴드 필터의 개략적인 블럭 구성도, 제3도는 램 RAM_V를 축소하기 위한 어드레싱표, 제4도는 메모리 제거 및 메모리사이즈 축소 후의 서브밴드 필터의 필터링 동작 흐름도.Fig. 1 is a schematic block diagram of a general subband filter, Fig. 3 is an addressing table for reducing ram RAM_V, Fig. 4 is a flowchart of filtering operation of a subband filter after memory removal and memory size reduction.

Claims (1)

서브밴드 샘플신호가 입력되면 아래 식(1)과 같이 연산하여 번수(V)가 입력될 위치를 정하는 제1단계와; 주파수축상의 데이타를 시간축상 데이타로 변환하기 위한 변수(Nik)와 샘플신호(S)를 아래 식(2)과 같이 연산하여 변수(V)를 구하고 이를 상기 제1단계의 위치에 저장하는 제2단계와; 상기 제2단계의 변수(V)와 ROM_D의 변수(D)값을 아래 식(3)과 같이 연산하여 최종 필터링된 신호(X)를 출력하는 제3단계로 이루어진 것을 특징으로 하는 서브밴드 필터의 필터링 방법.A first step of calculating a position at which the number (V) is to be input by calculating the following equation (1) when a subband sample signal is input; (V) for calculating a variable (Nik) and a sample signal (S) for converting data on the frequency axis into data on the time axis as shown in the following equation (2) ; And a third step of calculating a variable (V) of the second stage and a variable (D) value of ROM_D according to the following equation (3) and outputting a final filtered signal (X) Filtering method. J=I-(H%16)*32 (1)J = I- (H% 16) * 32 (1) if J〈 0 then J =J+512if J < 0 then J = J + 512 단, J : NEW ADDRESS, I : OLD ADDRESSJ: NEW ADDRESS, I: OLD ADDRESS (2) (2) 단, for i=0 to 31, Nik=cos((i+16) (2K+1) π/64), for i=0…31 and k=0…31For i = 0 to 31, Nik = cos ((i + 16) (2K + 1)? / 64), for i = 0 ... 31 and k = 0 ... 31 Xj= V*D (3)Xj = V * D (3) for j=0 to 31for j = 0 to 31 ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960008051A 1996-03-23 1996-03-23 Filtering method of subband filter KR970066881A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960008051A KR970066881A (en) 1996-03-23 1996-03-23 Filtering method of subband filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960008051A KR970066881A (en) 1996-03-23 1996-03-23 Filtering method of subband filter

Publications (1)

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KR970066881A true KR970066881A (en) 1997-10-13

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KR1019960008051A KR970066881A (en) 1996-03-23 1996-03-23 Filtering method of subband filter

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100913413B1 (en) * 2002-04-04 2009-08-21 엘지전자 주식회사 Parallel processing method for synthesis filterbank

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329587A (en) * 1993-03-12 1994-07-12 At&T Bell Laboratories Low-delay subband adaptive filter
EP0661827A2 (en) * 1993-12-29 1995-07-05 Hewlett-Packard Company Subband filtering using inverse discrete cosine transform
EP0663735A2 (en) * 1994-01-14 1995-07-19 Lg Electronics Inc. Synthesis subband filter
JPH0854896A (en) * 1994-08-10 1996-02-27 Toshiba Corp Coded voice decoder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329587A (en) * 1993-03-12 1994-07-12 At&T Bell Laboratories Low-delay subband adaptive filter
EP0661827A2 (en) * 1993-12-29 1995-07-05 Hewlett-Packard Company Subband filtering using inverse discrete cosine transform
EP0663735A2 (en) * 1994-01-14 1995-07-19 Lg Electronics Inc. Synthesis subband filter
JPH0854896A (en) * 1994-08-10 1996-02-27 Toshiba Corp Coded voice decoder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100913413B1 (en) * 2002-04-04 2009-08-21 엘지전자 주식회사 Parallel processing method for synthesis filterbank

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