Abstract: A waterproof enclosure for enclosing an electronic component includes an outer shell having a penetrating hole formed therethrough, a waterproof filter having air permeability and covering the penetrating hole, and a projecting part projecting from an outer surface of the outer shell and covering the penetrating hole, wherein the projecting part includes a plurality of vent holes connecting the penetrating hole to outside space, and wherein each of the vent holes is delimited by a sloping surface extending at an angle from the outer surface toward the penetrating hole.

Abstract: A waterproof enclosure for enclosing an electronic component includes an outer shell having a penetrating hole formed therethrough, a waterproof filter having air permeability and covering the penetrating hole, and a projecting part projecting from an outer surface of the outer shell and covering the penetrating hole, wherein the projecting part includes a plurality of vent holes connecting the penetrating hole to outside space, and wherein each of the vent holes is delimited by a sloping surface extending at an angle from the outer surface toward the penetrating hole.

Abstract: A digital phase lock loop circuit and method wherein the phase and the frequency of an output clock pulse of the circuit are made to instantaneously coincide with the phase and the frequency of an input clock pulse of the circuit. The digital phase lock loop circuit includes a fixed frequency generator circuit, an output frequency divider to which a standard clock pulse from the fixed frequency generator circuit is supplied via an inhibit gate, an output clock pulse frequency divider which divides the frequency of the output clock pulse from the output frequency divider, a phase comparator to which the input clock pulse and the divided clock pulse from the output clock pulse frequency divider are provided and an inhibit pulse generator to which the output of the phase comparator is supplied, so as to provide an inhibit pulse from the inhibit pulse generator to the inhibit gate.