US 6,321,025 B1Granted

Method and apparatus for receiving and/or reproducing digital signal

AssigneeHitachi, Ltd.

InventorsHitoaki Owashi, Hiroo Okamoto, Kyoichi Hosokawa, Takaharu Noguchi

Life of this patent

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Abstract

A method and apparatus is provided for receiving and/or reproducing a digital signal, capable of efficiently recording a compressed, packeted digital signal and inhibiting a copy thereof. An input packet signal is added with a time stamp indicating a relative time of an arrival of the packet, and the packet signals of digital information with the added time stamps are recorded at reduced intervals therebetween. In reproducing, a packet interval adjusting circuit restores the original packet intervals in accordance with the time stamps, and then a time stamp change circuit changes at least one bit of the time stamp and thereafter outputs the digital information.

Claims20

Dependent claims

A receiver apparatus for a digital signal comprising:

a receiver which receives a plurality of programs time-division multiplexed into a plurality of data packets, said plurality of data packets including discrimination information, and guide information regarding said plurality of programs, wherein said plurality of programs and said guide information regarding said plurality of programs are transmitted in a transmission channel and said guide information regarding said plurality of programs suggests the contents of said plurality of programs;
a selector which selects a program from the plurality of programs received by said receiver;
a former which forms guide information regarding the selected program from said received guide information regarding said plurality of programs, said formed guide information regarding the selected program being based on said discrimination information of the plurality of data packets and suggesting the contents of the selected program;
and
an outputter which outputs the selected program and the formed guide information.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/479,074Filed 7 Jan 2000 · continuation
Priority: JP 7-10343127 Apr 1995
Granted: 20 Nov 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification28 codes

H04N 5/85
Using optical recording: on discs or drums
H04N 5/77
Interface circuits between an apparatus for recording and another apparatus: between a recording apparatus and a television camera
H04N 7/165
Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing: centralised control of user terminal ;…
H04N 9/8042
Involving pulse code modulation of the colour picture signal components: involving data reduction