CA2220483A1 - Compressed digital-data interactive program system - Google Patents

Compressed digital-data interactive program system

Info

Publication number
CA2220483A1
CA2220483A1 CA002220483A CA2220483A CA2220483A1 CA 2220483 A1 CA2220483 A1 CA 2220483A1 CA 002220483 A CA002220483 A CA 002220483A CA 2220483 A CA2220483 A CA 2220483A CA 2220483 A1 CA2220483 A1 CA 2220483A1
Authority
CA
Canada
Prior art keywords
signal
selects
signals
interactive
video
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002220483A
Other languages
French (fr)
Other versions
CA2220483C (en
Inventor
Gregory W. Harper
Michael J. Freeman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ACTV Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA002464378A priority Critical patent/CA2464378A1/en
Priority claimed from PCT/US1996/007236 external-priority patent/WO1996037075A1/en
Publication of CA2220483A1 publication Critical patent/CA2220483A1/en
Application granted granted Critical
Publication of CA2220483C publication Critical patent/CA2220483C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

An interactive cable television system is disclosed which utilizes a standard cable television distribution network for simultaneously providing a plurality of viewers with an interactive television program comprising a plurality of signals related in time and content. Video signals (1) are transmitted in a digital format, more than one signal being multiplexed onto a data stream on a single channel. The video signals (1) may be compressed for efficiency. A receiver (7), in conjunction with a signal selector (8), selects a particular NTSC channel for playback, then selects a particular video signal from the data stream, and decompresses the video signal for playback. Seamless switching between video signals on different channels is provided. An alternative embodiment is disclosed wherein the various signals which comprise the interactive program are switched at the head end (300) rather than at the receiver (7). The multiple choice control unit (9) selects a desired signal by relaying the multiple choice selections of the user through a relay box (17) back to a remotely located switching station.
The switching station routes the correct video signal down the appropriate cable channel for the particular user.
CA002220483A 1995-05-18 1996-05-17 Compressed digital-data interactive program system Expired - Lifetime CA2220483C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002464378A CA2464378A1 (en) 1995-05-18 1996-05-17 Compressed digital-data interactive program system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US43360795A 1995-05-18 1995-05-18
US08/433,607 1995-05-18
PCT/US1996/007236 WO1996037075A1 (en) 1995-05-18 1996-05-17 Compressed digital-data interactive program system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA002464378A Division CA2464378A1 (en) 1995-05-18 1996-05-17 Compressed digital-data interactive program system

Publications (2)

Publication Number Publication Date
CA2220483A1 true CA2220483A1 (en) 1996-11-21
CA2220483C CA2220483C (en) 2004-12-07

Family

ID=23720800

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002220483A Expired - Lifetime CA2220483C (en) 1995-05-18 1996-05-17 Compressed digital-data interactive program system

Country Status (3)

Country Link
JP (1) JP3946251B2 (en)
CA (1) CA2220483C (en)
DK (1) DK0826287T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008511249A (en) * 2004-08-25 2008-04-10 トムソン ライセンシング Reduces channel change time for digital video input

Also Published As

Publication number Publication date
JP2002515194A (en) 2002-05-21
CA2220483C (en) 2004-12-07
JP3946251B2 (en) 2007-07-18
DK0826287T3 (en) 2002-10-07

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Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20160517

MKEX Expiry

Effective date: 20160517