Title:
【発明の名称】多重音信号発生器
Document Type and Number:
Japanese Patent JPS58501254
Kind Code:
A
Abstract:
A multi-tone signal generator and tone generating method for producing frequency combinations such as those used in dual-tone telephone dialing systems. A phase accumulator tone generator which in one embodiment comprises programmable divider (18) an accumulator (20), a ROM (22) and a latch (30) so interconnected as to generate samples of one of the tones to be encoded, at a rate much lower than would normally be required by the Nyquist criterion for the highest frequency desired. The output rate is specifically chosen so that a distortion product appears at the frequency of the second tone to be generated. The resulting samples are applied to a D/A converter (34) and then passed through a low pass filter (36).
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Inventors:
Labettes Gerardo Poles
Application Number:
JP50256882A
Publication Date:
July 28, 1983
Filing Date:
July 28, 1982
Export Citation:
Assignee:
Motro-La Inco-Pole-Ted
International Classes:
G06F1/03; H04L27/30; H04M1/50; H04Q1/45; H03B19/00; H03B; (IPC1-7): H04Q1/45; H04M1/50; H03K13/02; H03B19/00; G10K10/00
Attorney, Agent or Firm:
Kugoro Tamamushi