The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1993
Filed:
Apr. 20, 1992
Applicant:
Inventors:
Hirohito Suda, Yokosuka, JP;
Kazunaga Ikeda, Yokohama, JP;
Assignee:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
370 77 ; 370 81 ; 371 31 ;
Abstract
A speech transmission method utilizes a speech frame length having a time period within which a speech waveform remains substantially steady-state, and the speech frame length is selected to be 1/M the time period of one TDM or TDMA frame. For each speech frame, speech signal is coded, from which are selected M different speech codes including two speech codes that are spaced one or more speech frames apart, and the selected M speech codes are combined into composite codes. Each composite code is inserted in one time slot of each TDM or TDMA frame.