Boots – shoes – and leggings
Patent
1979-11-23
1982-08-24
Ruggiero, Joseph F.
Boots, shoes, and leggings
328 14, 364703, 364721, G06F 15353, G06J 100
Patent
active
043464483
ABSTRACT:
For the purpose of generating an output signal having a sinusoidal waveform, a digital store stores at different locations binary-coded amplitudes at equally spaced instants of time throughout a complete cycle of a sine wave. Those locations are addressed in turn by means of a pulse counter and the signals supplied by the memory are passed to a digital/analogue converter from which the required output signal is derived. The pulse signal supplied to the counter is obtained from a train of clock pulses by a programmable divider. To effect a frequency change in the output signal (for the purpose of signalling binary data), the divisor of the divider is changed in a sequence of steps so that the overall change in output frequency is less abrupt than would otherwise be the case.
The arrangement described is suitable for use in a modem working with the Viewdata system currently adopted by the British Post Office.
REFERENCES:
patent: 3657657 (1972-04-01), Jefferson
patent: 3739374 (1973-06-01), Klowski
patent: 4039951 (1977-08-01), Bruce et al.
patent: 4109208 (1978-08-01), Tomisawa et al.
patent: 4134072 (1979-01-01), Bolger
patent: 4142245 (1979-02-01), Baron
patent: 4192007 (1980-03-01), Becker
Insam Howard F.
Laurenson Stephen R.
Ruggiero Joseph F.
The General Electric Company Limited
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