Telephone including an electromechanical transducer, method of a

Details Telephone including an electromechanical transducer, method of a Telephone including an electromechanical transducer, method of a

1997-03-06

1999-09-14

Chiang, Jack

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379373, H04M 100

Patent

active

059534087

ABSTRACT:
A telephone is disclosed which includes a transducer and a controller. The transducer produces a sound having a level which varies as a function of the frequency and duty cycle of an excitation signal. The controller provides the excitation signal which has different frequencies, such as a coded melody. The controller varies the duty cycle so that the level of the sound from the transducer remains constant at the different frequencies. The telephone also includes a memory for storing values of the duty cycle corresponding to the different frequencies. These values allow the level of the sound to remain constant at the different frequencies. The controller codes the melody by storing in a table of the memory components of the melody, such as notes, silences, repetitions, the duration of each note or each silence, and a repetition number for melody components which are to be repeated. A time limit is also included in the table when the repetition number is infinite.

REFERENCES:
patent: 4598179 (1986-07-01), Clark et al.
patent: 4731828 (1988-03-01), Basehore
patent: 4866766 (1989-09-01), Mitzlaff

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