US 3,937,933 A · System and method for reducing the pulse repetition rate in an electronic taxi meter

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.

Claims3

Dependent claims

In a taxi meter, a method for creating a sequence of tariff signals each representing a determined fare increment in response to, and in a determined ratio with respect to a plurality of input pulses each representing a determined distance travelled or a determined waiting time, comprising, in combination, the steps of furnishing an addend signal signifying a determined addend;

creating a sum signal by sequential additions of said addend signal, one in response to each of said input signals;
and creating a carry signal whenever the so-created sum signal exceeds a sum signal signifying a predetermined number, said determined addend being substantially equal to the ratio of K/T where K is said predetermined number and T said determined ratio, said carry signals constituting said tariff signals.

In an electronic taxi meter, a system for creating tariff signals each representing a fare increment at a determined fate rate, comprising, in combination, input means for furnishing a sequence of input signals each representing a determined distance travelled or a determined unit of waiting time, the ratio of the number of said input signals to the desired corresponding number of said tariff signals having a value of T at said determined fare rate;

adder means having an input and a determined capacity, for adding signals applied at said input, creating a sum signal corresponding to the sum of so-applied signals and furnishing a carry signal whenever said sum signal exceeds said determined capacity;
and addend furnishing means connected to said input means and said adder means for furnishing an addend signal signifying an addend substantially equal to the ratio of K/T in response to each of said input signals, whereby said carry signals furnished by said adder means constitute said tariff signals.

Dependencies are inferred from the claim text.

System and method for reducing the pulse repetition rate in an electronic taxi meter

Life of this patent

System and method for reducing the pulse repetition rate in an electronic taxi meter

Life of this patent

Abstract

Claims3