Reexamination Control No. 90/005,742
Patent 5,253,341
1 The examiner was therefore correct to hold that the declarations are insufficient to
2 antedate Yurt as a reference with respect to the rejections of claim 11.
3 (2) The Yurt disclosure
4 Figures 1a to 1g of Yurt are block diagrams of various configurations of transmission
5 systems 100 and reception systems 200 (Yurt, col. 3, ll. 24-26) which permit remote users to
6 request audio and/or video information from a compressed data library 118 (Fig. 2b) in the
7 transmission system (Id. at col. 6, ll. 35-38). In the Figure 1e configuration, transmission system
8 100 is directly connected to (a) a reception system 200 that includes a single user and (b) a
9 reception system 200' that serves as the head end of cable television systems 200a and 200b. Id.
10 at col. 4, ll. 22-29. As shown in Figure 2b, transmission system 100 may send the requested
11 information to the customer's reception system 200 (or 200’) using any of the following
12 communication links: ISDN (Integrated Services Digital Network ), B ISDN (Broadband
13 Integrated Services Digital Network), satellite, cable TV, LAN or MAN, or telephone lines. Id.
14 at col. 16, ll. 4-15. The transceiver 122 which sends the requested information over standard
15 telephone lines is a modem. Id. at col. 16, ll. 58-59. The user accesses the transmission system
16 100 (i.e., sends a request for information) over a standard telephone line. Id. at col. 3, ll. 54-58;
17 col. 14, ll. 6-9. Video data are compressed using two compression techniques:
18 Video data compression preferably involves applying two processes: a
19 discrete cosine transform, and motion compensation. This process is
20 described in "A Chip Set Core of Image Compression", by Artieri and
21 Colavin. Multiple frames of video data may preferably be analyzed for
22 patterns in the horizontal (H), vertical (V), diagonal (zigzag) and time (Z)
23 axis. By finding repetition in the video data, redundancy may be removed
24 and the video data may be compressed with a minimal loss of information.
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