Device and method for converting frame rate

A device for converting a frame rate in an MPEG decoding device, the MPEG decoding device comprising a data restoring part for receiving and restoring a video bitstream through variable decoding, inverse scanning, inverse quantizing and IDCT, a memory for storage of prior pictures and a display controlling part for re-arranging a received data according to an order of display, the device comprising:

• motion vector reproducing means for using a motion vector MV transmitted from a transmitter side in producing a new motion vector MV', multiplexing MV+MV' the new motion vector with existing motion vectors in terms of time;
• a motion compensating and frame producing means for applying the motion vector MV+MV' from the motion vector reproducing means to prior pictures stored in the frame memory respectively and adding to data from the data restoring part respectively;
• and,
• storage means for writing the data from the motion compensating and frame producing means at a regular clock frequency, reading at a clock frequency two times faster and forwarding to the display controlling part.

A method for converting a frame rate in an MPEG decoding method, the MPEG decoding method including the steps of receiving and restoring a video bitstream through variable length decoding, inverse scanning, inverse quantizing and IDCT and adding to a motion compensated data using a stored prior picture and a motion vector provided from a transmitter side for providing a field or a frame before compression, the method comprising:

• (1) a motion information producing step for producing a new motion vector using the motion vector;
• (2) a frame producing step for applying the new motion vector produced in the (1) motion information producing step to the field or frame for producing a motion component compensated new field or frame;
• and,
• (3) a display step for adding the motion component compensated new frame in the (2) frame producing step to the MPEG decoded frame for display on a screen in a converted frame rate.