Digital tone generation based on difference equations

Details Digital tone generation based on difference equations Digital tone generation based on difference equations

1988-06-27

1992-06-09

Shaw, Dale M.

Boots, shoes, and leggings

G06F 102

Patent

active

051213508

ABSTRACT:
A method of generating pure and decaying sinusoidal waveforms is readily implemented on arithmetic processors found in telecommunications circuits. The method is based on finite-difference equations and provides a sequence of signals having a high degree of spectral accuracy compared with presently-used methods. The sequence of signals can be generated in real-time without templates (ROM-stored patterns) because the method requires only two multiplications (16,18) and one addition (12) for each signal value generated in the sequence. The method finds application in dual-tone, multi-frequency (DTMF) telephone dialing systems.

REFERENCES:
patent: 4133241 (1979-01-01), Niimi et al.
patent: 4761751 (1988-08-01), Canniff

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