摘要:
A method and apparatus for reformatting auxiliary information such as closed caption text that is extracted from a television signal. The apparatus reformats the text by removing redundant spaces, reorganizing the text to fit into an arbitrary sized closed caption window, converting any closed caption display mode (e.g., pop on, paint on or roll up) into a modified roll on display, and inserting speaker identifier prompts into the caption.
摘要:
Apparatus for combining an auxiliary image and a main image includes a source of a main image signal and a source of samples representing an auxiliary image signal. A subsampler selectively subsamples the auxiliary image samples in either a quincunx subsampling pattern or a rectangular subsampling pattern. A signal combiner combines the main image signal and a signal representing the subsampled auxiliary image samples to generate a combined image signal. A control circuit generates a freeze control signal for the subsampler which conditions it to take samples in the rectangular subsampling pattern during a freeze frame operation, and in the quincunx sampling pattern otherwise.
摘要:
A selection or display feature of a jukebox containing a plurality of storage media, such as CDs, is automatically programmed by determining a content-related profile of information stored on a medium and, utilizing the profile, retrieving content-descriptive information and utilizing the content-descriptive information. A screen display generator performs diskography on, e.g., an audio or video disk, to determine a disk profile, compares the disk profile to those stored in either a local or remote database, receives associated program descriptive data and incorporates the program descriptive data into a menu for display and selection.
摘要:
A process and apparatus for converting an MPEG-2 bitstream into an SMPTE-259 compatible bitstream is characterized by a frame rate converter which is selectively enabled to drop every 1001st frame of the incoming MPEG-2 bitstream depending on the input bitstream frame rate. If the input bitstream frame rate is other than 29.97 or 59.94 Hz, a frame dropper is enabled to discard every 1001st frame. The present converter can convert many different types of input bitstreams, such as all I types, IPIP types, or complex GOP types containing I, P, and B frames. The enabled frame dropper will drop either the I or P frame if it occurs as the 1001st frame, but if the 1001st frame is of the B frame type, the pixel information of the B frame is dropped. This produces a minimum in loss of information during the conversion. The format converter allows existing SMPTE-259 routing equipment to route and utilize MPEG-2 bitstreams, such as HDTV applications.
摘要:
In order to selectively reduce the size of an auxiliary image, such as may be displayed within main image during a so called "picture-in-picture" or "PIP" mode of operation of a television system, a fixed amount of the auxiliary image is caused to be cropped from the auxiliary image without changing the compression ratio of the compressed auxiliary video signal from which the auxiliary image is derived.
摘要:
A current picture partitioned into a plurality of partitions is received and encoded by determining a total target number of encoded bits for the current picture to avoid overflow or underflow of a video buffer verifier (VBV) maintained by an encoder. The encoder determines a local target number of encoded bits for each partition of the current picture, in accordance with the total target number. A plurality of partition encoders encode each partition, respectively, in accordance with the local target number for said each partition, wherein each partition encoder maintains a local VBV having a local VBV fullness, to monitor local underflow or overflow conditions.
摘要:
A high-voltage power supply of a video display apparatus provides an ultor voltage and a focus voltage to a cathode ray tube. A low-voltage power supply provides a variable voltage to a primary winding of a flyback transformer of the high-voltage power supply. The magnitude of the variable voltage is responsive to first and second feedback signals provided by first and second negative feedback paths. The first feedback signal is derived from the ultor voltage and is used to regulate the ultor voltage. The second feedback signal is provided by the low-voltage power supply via a path that bypasses the high-voltage power supply, and is summed with the first feedback signal to ensure that the focus voltage remains at or above a predetermined minimum voltage.