Telephone hold circuit

Details Telephone hold circuit Telephone hold circuit

1998-05-12

2000-12-05

Woo, Stella

Telephonic communications

Substation or terminal circuitry

Hold circuit

H04M 100

Patent

active

061577138

ABSTRACT:
A hold circuit arrangement for a telephone, wherein the telephone is coupled to an extension release circuit of an external telephone, the hold circuit comprising an input control terminal; a tri-state input device used for generating a signal for the input control terminal; a power supply used for providing a high impedance level for the input control terminal; a hold button circuit used for allowing a hold button of the telephone to convert a status of the hold circuit through the tri-state input device after the hold function is activated regardless of whether the telephone is off-hook or on-hook; and a detecting circuit used for alternately providing a high impedance high level signal or a high impedance low level signal to detect the status of the tri-state input device when the hold function of the telephone is activated, and deciding whether the telephone is hold or not, and signaling the power supply to stop providing the high impedance level signal to the input control terminal when the hold function of the telephone is activated.

REFERENCES:
patent: 4365117 (1982-12-01), Curtis
patent: 4394543 (1983-07-01), Keiper, Jr. et al.
patent: 4419543 (1983-12-01), Kelm et al.
patent: 4440981 (1984-04-01), Grantland et al.
patent: 4529843 (1985-07-01), Boeckmann
patent: 5285495 (1994-02-01), Wu et al.

Affiliated with

Also associated with

Rating

Telephone hold circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telephone hold circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone hold circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-968412