Title:
μ則-A則変換装置及びA則-μ則変換装置
Document Type and Number:
Japanese Patent JP3570941
Kind Code:
B2
Abstract:
mu-law-to-A-law translating equipment is used for plural PCM telephone lines installed between countries different in a conversion law. This translating equipment is provided with plural mu-law signal receiving circuits, a multiplexer, a mu-law-to-A-law converter, a demultiplexer, plural A-law signal output circuits and a timing pulse generator. Each mu-law signal receiving circuit outputs parallel mu-law PCM signals synchronized with a reference frame pulse and the multiplexer time-division multiplexes these signals according to a time division system. The mu-law-to-A-law converter outputs a time-division multiplexed A-law PCM signal, the demultiplexer demultiplexes this time-division multiplexed signal and outputs plural parallel A-law PCM signals. The A-law signal output circuit outputs a serial A-law PCM signal to which a frame bit is added.
Inventors:
Minoru Izumiya
Application Number:
JP33461599A
Publication Date:
September 29, 2004
Filing Date:
November 25, 1999
Export Citation:
Assignee:
NEC Communication Systems, Ltd.
International Classes:
H03M7/50; H04B14/04; H04L12/50; H04M3/00; H04Q11/04; (IPC1-7): H04B14/04; H03M7/50; H04M3/00
Domestic Patent References:
| JP50003204A | ||||
| JP61001194A | ||||
| JP3050997A |
Attorney, Agent or Firm:
Masahiko Desk
Kawai Nobuaki
Yasuhisa Tanizawa
Kawai Nobuaki
Yasuhisa Tanizawa