Title:
RINGING SIGNAL GENERATOR
Document Type and Number:
Japanese Patent JPS5999856
Kind Code:
A
Abstract:
D.C.-fed ringing signal generator for a group of subscriber lines comprises a cascade arrangement of a digital signal generator controllable by a control signal to produce a signal corresponding either to the ringing signal or to a signal having zero value, a digital-to-analog converter, a capacitively-coupled class-A amplifier, and a direct-coupled class-B symmetrical power amplifier to produce the output signal of the ringing signal generator.
Inventors:
ARAN HORESUTEIE
FUIRITSUPU FUNOO
FUIRITSUPU FUNOO
Application Number:
JP19934083A
Publication Date:
June 08, 1984
Filing Date:
October 26, 1983
Export Citation:
Assignee:
TRT TELECOM RADIO ELECTR
International Classes:
H04M3/02; H04M19/02; (IPC1-7): H04M3/06
Domestic Patent References:
| JPS5741068A | 1982-03-06 | |||
| JPS5254253U | 1977-04-19 |
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)