Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-10-31
1981-09-22
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 358138, 358261, 364112, H03K 1302
Patent
active
042912997
ABSTRACT:
An analog signal is sampled in response to a sampling command. Each time that the analog signal, or the difference between the analog signal and the previous sample thereof, crosses a respective reference level, a digital signal is produced. Each digital signal consists of a code representing the level crossing or incremental change in level which has occurred and a count representing the time which has elapsed since the last sample command. A digital signal is also produced if the elapsed time reaches a predetermined period. On production of each digital signal, a sampling command is produced and the elapsed time counting is recommenced. The digital signals constitute a digital representation of the analog signal. The converter is particularly useful for converting analog signals having both very high and very low frequency portions, such as current surges which occur on telephone lines affected by lightning (high frequency) and 60 Hz induction (low frequency).
REFERENCES:
patent: 2949505 (1960-08-01), Kretzmer
patent: 2978535 (1961-04-01), Brown
patent: 3383461 (1968-05-01), Dryden
patent: 3753133 (1973-08-01), Shumate
Hinz Lorne C.
Thomas William P.
Northern Telecom Limited
Sadik Achmed N.
Sloyan Thomas J.
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