Small electronic apparatus

Details Small electronic apparatus Small electronic apparatus

1989-02-07

1990-05-01

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379368, H04M 100

Patent

active

049225278

ABSTRACT:
A small electronic apparatus has a plurality of keys for inputting telephone numbers of communication destination, and when each key is depressed, confirmation sound is generated by a sound generating means. The apparatus is provided with structure for generating signals in combination of signals of multiple frequencies and for supplying it to the sound generating means, thereby the composite signal becomes the input frequency in which the sound generating means indicates good output charactieristics, and when the sound generating means generates sound, distinction of each key can be performed.

REFERENCES:
patent: 4496799 (1985-01-01), Kingen et al.
patent: 4528681 (1985-07-01), Fulcomer, Jr.
patent: 4571462 (1986-02-01), Janssen
J. J. A. Geboers, "Bipolar IC's for DTMF telephone dialling" Philips Technical publication 050 , 1982.

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