Abstract: An air filtrating disk drive slot dust protector comprises an air filtrating element attached to the front portion of a disk shaped supporting body, so that insertion of the protector into the disk drive causes the disk drive slot to be blocked by the air filtrating element, thereby keeping the dust from entering the disk drive slot but still allowing the cooling air to pass.

Abstract: This high definition TV method and system are compatible with existing TV sets, existing TV broadcast channels and existing VCRS. Each standard-size picture element in a standard NTSC color television luminance signal is split into two ("Alternate Sampled Luminance" or "ASL") smaller high resolution (HR) picture elements. These two HR elements form a group, and are labeled `A` and `B` according to their relative positions in the group. Positive-going and negative-going pulses in a square-wave sampling control signal serve to control sampling for obtaining HR elements. HR elements having the same label are sampled in the same frame scanning period and then are used to represent the whole of each group in that frame. HR picture elements are sampled one label at a time and are transmitted in consecutive frames. Thus, all `A` HR elements are transmitted in Frame "A"; all `B` HR elements are transmitted in Frame "B". Frames "A" and "B" alternate with each other.