US 7,403,139 B2Granted

Electronic apparatus and control method thereof using sample rate converter

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsShuhei Sasakura, Tatsuya Adachi, Isao Kato, Kazuya Iwata, Naoki Ejima, Seiji Nakamura, Yoshihisa Inagaki

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Abstract

An electronic apparatus reads a digital data stream including a video signal and/or an audio signal outputted from an external apparatus according to a transmission clock different from a clock for the data stream, and outputs the video signal and/or audio signal without causing any discontinuity. The electronic apparatus includes a sample rate converter that rate-converts a predetermined volume of the audio signal in synchronization with a constant sampling clock, and changes a number of samples to be outputted, based on a data volume of an audio signal outputted by the electronic apparatus and a data volume of an audio signal transmitted from the external apparatus or transmittable from the external apparatus to the electronic apparatus.

Claims8

Dependent claims

An electronic apparatus comprising:

a communication section for requesting an external apparatus to transmit a digital data stream including a video signal and/or an audio signal which are continuous relative to a time axis, and for receiving the digital data stream transmitted in response to the request,
a sample rate converter for rate-converting a received video signal and/or audio signal;
and
an output section for outputting the video signal and/or audio signal which are rate-converted and demodulated into a continuous signal,
wherein, in such a state that a synchronization clock for the video signal and/or audio signal is not outputted from said electronic apparatus, said sample rate converter changes a number of samples to be outputted in the case that a predetermined volume of the video signal and/or audio signal is rate-converted according to a constant sampling clock and outputted, based on:
(a) time information and/or data volume of the video signal and/or audio signal processed or outputted by the electronic apparatus;
and
(b) time information and/or data volume of the video signal and/or audio signal, which are transmitted from said external apparatus or transmittable from said external apparatus to said electronic apparatus.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/572,960Filed 17 Sep 2004
Priority: JP 2003-33054422 Sep 2003
Published: US 2007/0046819 A11 Mar 2007
Granted: 22 Jul 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04N 21/4143
Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance: embedded in a Personal Computer [PC]
H04N 7/01
Television systems: conversion of standards , e.g. involving analogue television standards or digital television standards processed at pixel level
H04N 21/41265
The peripheral being portable, e.g. PDAs or mobile phones: having a remote control device for bidirectional communication between the remote…
H04N 21/4305
Content synchronisation processes, e.g. decoder synchronisation: synchronising client clock from received content stream, e.g. locking decoder…