Frequency-signalling circuit for a telephone

Details Frequency-signalling circuit for a telephone Frequency-signalling circuit for a telephone

1976-01-08

1977-05-24

Heyman, John S.

Oscillators

Relaxation oscillators

328 18, 328 48, 331 78, 340347DA, H03K 384, H03K 302

Patent

active

040258653

ABSTRACT:
A frequency signaling circuit includes a plurality of channels, each channel having division means for frequency division of a clock signal, the division ratio being selected in accordance with data defining the required frequency. Stochastic conversion means are provided for converting the output of the frequency division means into pulse trains with the repetition rate of the required frequency. The stochastic conversion means includes a noise generating circuit, a value generating circuit for generating signals representing a predetermined sequence of values at a rate determined by the output of the division means and a comparison circuit for comparing the values produced by the value generating circuit with the values represented by the outputs of the noise generating circuit and for producing a pulse whenever a predetermined relation exists between the values.

REFERENCES:
patent: 3787836 (1974-01-01), Hagelbarger
patent: 3820028 (1974-06-01), Thomas
patent: 3829783 (1974-08-01), Groenendaal et al.
patent: 3832639 (1974-08-01), Janssen
patent: 3882403 (1975-05-01), Gerken
patent: 3952189 (1976-04-01), Fabricius

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