EP0500076A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and arrangement of determining coefficients for linear predictive coding
Assignee: NEC Corp
•
Filing: 1992-02-19
•
Granted: —
•
Expires: 2012-02-19
Abstract
Abstract In order to reduce the number of update operations for determining LPC (viz., reflection) data from an incoming sampled data, a plurality of matrices representative of autocorrelation functions are set in memory. Subsequently, data representative of the upper triangular portions of the matrices (virtual upper triangular matrices) are extracted from the memory and arranged into an array. This array is then updated using a j-th reflection coefficient, after which the value of j is incremented and the updating is repeated until a predetermined number of updating is completed.
Inventors
- 👤 Mayumi c/o NEC Corporation Nagasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 07:23
CPC Classifications
G; G10; G10L; G10L25/00; G10L25/48; G10L25/03; G10L25/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
A method of determining reflection coefficients using linear predictive coding wherein a plurality of autocorrelation coefficients are derived from an incoming sampled speech signal, the autocorrelation coefficients being utilized to produce elements of three types of matrices F, C and B which are memorized in a memory and by which said reflection coefficients are calculated, said method comprising the steps of: (a) selectively retrieving, from said memory, elements to be included in three upper triangular matrices F', C' and B' of said matrices F, C and B, respectively, and retrieving, from said memory, elements to be included in an upper triangular matrix C' t of a transposed matrix C t of said matrix C; (b) arranging the elements retrieved in step (a) into an array; (c) calculating a j-th (j is a positive integer) reflection coefficient using said array; (d) updating the element values in said array according to the reflection coefficient calculated in step (c); and (e) incrementing the value of j and repeating steps (c) and (d) until a predetermined number of updating is completed.
Claim 2
Dependent Claim
65 words
A method as claimed in claim 1, wherein the process in step (b) includes grouping of the matrix elements with row indicators having the same value into a plurality of sub-groups, each of said sub-groups being arranged according to ascending order of column indicator values, and the matrix elements having identical row and column indicator values in each sub-group are arranged in a predetermined order.
Claim 3
Independent Claim
154 words
An apparatus for determining reflection coefficients using linear predictive coding wherein a plurality of autocorrelation coefficients are derived from an incoming sampled speech signal, the autocorrelation coefficients being utilized to produce elements of three types of matrices F, C and B which are memorized in a memory and by which said reflection coefficients are calculated, said apparatus comprising: means for selectively retrieving, from said memory, elements which are included in three upper triangular matrix portions F', C' and B' of said matrices F, C and B, respectively, and retrieving, from said memory, elements which are included in an upper triangular matrix portion C' t of a transposed matrix C t of said matrix C; means for arranging the retrieved elements into an array; means for calculating a j-th (j is a positive integer) reflection coefficient using said array; and means for updating the element values in said array according to the calculated reflection coefficient.
Claim 4
Dependent Claim
63 words
An apparatus as claimed in claim 1, further including means for grouping of the matrix elements with row indicators having the same value into a plurality of sub-groups, arranging each of said sub-groups according to ascending order of column indicator values, and arranging the matrix elements so that identical row and column indicator values in each sub-group are arranged in a predetermined order.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.