Ringer signal wave shaping circuit

Details Ringer signal wave shaping circuit Ringer signal wave shaping circuit

1983-10-24

1985-06-11

Rubinson, Gene Z.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340328, 340329, H04M 100

Patent

active

045230587

ABSTRACT:
Improved ringer signal circuitry in a telephone handset modifies the leading edge of the ringer signal envelope causing ringer volume to gradually increase, over a period of time, to its maximum value.

REFERENCES:
patent: 3068319 (1962-12-01), Fletcher et al.
patent: 3271520 (1966-09-01), Fletcher et al.
patent: 3450846 (1969-06-01), Why
patent: 3466403 (1969-09-01), Combridge et al.
patent: 4010329 (1977-03-01), Draper

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