Error detection in receiving multiplex signals
AssigneeNokia Mobile Phones Ltd.
InventorsAri Hourunranta, Miska Hannuksela
Life of this patent
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Abstract
A method in reception of a multiplex signal, comprising one or more data units, and at least one framing data block in each multiplex signal. The method comprises: searching for said framing data block from a received multiplex signal; demultiplexing said one or more data units according to the information in said framing data block; generating one or more demultiplexed signals from said demultiplexed data units, and forwarding said demultiplexed signals for decoding (50). At multiplexing possible invalidity of demultiplexed video data units is detected (51), and as a response to a detected invalidity in a demultiplexed video data unit, an error indication to the demultiplexed video data signal is added (52).
Claims38
A method of demultiplexing a multiplexed signal, said multiplexed signal comprising packet data units, the packet data units including data packets belonging different logical channels, the packet data units being delimited by framing flags, the method comprising:
- searching for said framing flags from a received multiplexed signal and de-framing the packet data units with reference to the framing flags;
- demultiplexing the data packets belonging to the different logical channels from the packet data units and assembling them into demultiplexed signals,
- detecting invalidity of a demultiplexed signal by examining errors encountered while de-framing the packet data units;
- adding error location to the demultiplexed signal, the error location information indicating the location of erroneous bits in the demultiplexed signal;
- and
- forwarding a demultiplexed—signal to a corresponding decoder for the logical channel and further providing the decoder with an error type indication—for use by the decoder during decoding of the demultiplexed signal to enable recovery from the error.
A device for demultiplexing a multiplexed signal, said multiplexed signal comprising packet data units, the packet data units including data packets belonging to different logical channels, the packet data units being delimited by framing flags, said device comprising:
- an input for receiving the multiplexed signal,
- a processor;
- and
- a set of outputs for forwarding demultiplexed signals to corresponding decoders,
- the device being arranged to:
- search for said framing flags from a received multiplexed signal and to de-frame the packet data units with reference to the framing flags;
- demultiplex the data packets belonging to different logical channels from the packet data units and assemble them into demultiplexed signals,
- detect invalidity of a demultiplexed signal by examining errors encountered while de-framing the packet data units;
- add error location information to the demultiplexed signal, the error location information indicating the location of erroneous bits in the demultiplexed signal;
- and
- forward an invalid demultiplexed signal to the corresponding decoder for the logical channel and further provide the decoder with an error type indication for use by the decoder during decoding of the demultiplexed signal to enable recovery from the error.
A multimedia terminal comprising a demultiplexor for demultiplexing a multiplexed signal, said multiplexed signal comprising packet data units including data packets belonging to different logical channels, the packet data units being delimited by framing flags, said demultiplexor comprising:
- an input for receiving a multiplexed signal;
- a processor;
- and
- a set of outputs for forwarding demultiplexed signals to corresponding decoders,
- the multiplexor being arranged to:
- search for said framing flags from a received multiplexed signal and to de-frame the packet data units with reference to the framing flags;
- demultiplex the data packets belonging to different logical channels from the packet data units and assemble them into demultiplexed signals,
- detect invalidity of a demultiplexed signal by examining errors encountered while de-framing the packet data units;
- add error location information to the demultiplexed signal, the error location information indicating the location of erroneous bits in the demultiplexed signal;
- and
- forward a invalid demultiplexed signal to the corresponding decoder for the logical channel and further provide the decoder with an error type indication for use by the decoder during decoding of the demultiplexed signal to enable recovery from the error.
Dependencies are inferred from the claim text.