Title:
【発明の名称】電話通信回線容量エキスパンダ
Document Type and Number:
Japanese Patent JPS63500767
Kind Code:
A
Abstract:
A private telephone line expander is disclosed which receives two analog voice inputs. Both input signals are digitized, compressed using full period splicing, and converted back to analog for transmission. One is shifted to the upper half of the telephone line bandwidth. The other remains in the lower half. Both are transmitted on the same telephone line. When received both signals are expanded to normal telephone bandwidth and can be connected to two different telephones. DTMF signals are transmitted with each voice transmission.
Inventors:
Staples, Leicester H
Cresse, James M
Cresse, James M
Application Number:
JP50479686A
Publication Date:
March 17, 1988
Filing Date:
September 05, 1986
Export Citation:
Assignee:
Republic Telkom Systems Co., Ltd.
International Classes:
G10L19/00; G10L25/90; H04B1/66; H04B14/04; H04J1/00; H04J99/00; H04Q5/24; H04B; (IPC1-7): G10L3/00; H04B1/66; H04B14/04; H04J1/00
Attorney, Agent or Firm:
Kyozo Yuasa