公开(公告)号：US20020047914A1

公开(公告)日：2002-04-25

申请号：US09459631

申请日：1999-12-13

Applicant: U.S. Philips Corporation

Inventor： JURGEN F. ROSENGREN ,  RONALD W.J.J. SAEIJS

IPC: H04N007/12

CPC classification number: H04N21/4334 ,  H04N5/4401 ,  H04N5/45 ,  H04N21/235 ,  H04N21/2365 ,  H04N21/4345 ,  H04N21/4347 ,  H04N21/435

Abstract: The invention relates to an arrangement for deriving an ancillary signal from a compressed digital video signal (e.g. MPEG). The ancillary signal comprises selected parts of the main signal, for example, the DC coefficients of I-pictures, or the unscrambled parts. The ancillary signal thus obtained can be used for display in a (multi-) picture-in-picture television receiver, or as an nullappetizernull in order to encourage the user to pay a subscription fee. The ancillary signal can separately be recorded in digital video recorders so as to assist the user in finding the beginning of a scrambled program on tape. The ancillary signal can also be generated at the transmitter end and transmitted at a low bit rate. A decoder for decoding such an ancillary signal is considerably simpler and less expensive than a full-spec MPEG decoder.

Abstract translation: 本发明涉及一种用于从压缩数字视频信号（例如MPEG）导出辅助信号的装置。 辅助信号包括主信号的选定部分，例如I图像的DC系数或未加扰部分。 如此获得的辅助信号可以用于（多）画中画电视接收机中的显示，或者作为“开胃菜”，以鼓励用户支付订阅费用。 辅助信号可以分别记录在数字视频记录器中，以帮助用户找到磁带上加扰程序的开始。 辅助信号也可以在发射机端生成并以低比特率传输。 用于对这种辅助信号进行解码的解码器比全规格MPEG解码器要简单且便宜。