| |
| | Synthesizer of multifrequency code signals - Patent 3999049 |
 | | A synthesizer of multifrequency signals formed by a "m out of M" code combination of m concomitant sinusoidal component signals, said m component signals having different frequencies, which are selected from a plurality of M predetermined frequencies, said M frequencies all being equal to sub-multiples of a common clock signal frequency, said synthesizer comprising: |
 | | A synthesizer of multifrequency signals each formed by a "m out of M" code combination of m concomitant sinusoidal component signals, said m component signals having different frequencies which are selected from a plurality of M predetermined frequencies, said M frequencies all being equal to submultiples of a common clock signal frequency, said synthesizer comprising: |
 | | In the multifrequency code used here the frequencies of the code are voiceband frequencies which, allowing for a tolerance, are integral sub-multiples of a single fundamental frequency. |
| www.freepatentsonline.com /3999049.html (4475 words) |
|