System and method for reducing the pulse repetition rate in an electronic taxi meter
US3937933A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1974 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Dec 3, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q30/0284
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The taxi meter receives a sequence of pulses each representing a determined distance travelled by the taxi. The repetition rate of the input pulses is to be reduced by a ratio T so that each pulse having the reduced repetition rate signifies a determined fare increment. An adder or counter has a determined capacity and furnishes a carry signal whenever the sum signal created therein exceeds that capacity. An addend equal to K/T where K is the capacity of the adder is applied to the input of the adder for addition therein in response to each of the input pulses. The carry signals furnished by the adder constitute the desired signals each signifying the correct fare increment. The repetition rate of pulses each signifying a unit of waiting time can be similarly reduced and the resulting carry pulse sequences be applied to a selection circuit which selects the one having the highest repetition rate to constitute the tariff signal, namely the signals for advancing the taxi meter by one fare increment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.