Decoder Error Indication Logic for DTMB Transport Streams
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Solution Overview
Problem
DTV receivers complying with the DTMB standard face unreliable error detection and correction due to the poor error detection and correction capability of BCH decoders, leading to suboptimal performance in identifying and handling error packets in the transport stream.
Innovation Solution
A signal processing apparatus comprising an inner-code decoder, an outer-code decoder, an error detection unit, and decision logic is used to perform error detection and set reliable error indication information, leveraging the LDPC decoder and BCH decoder to correct error bits and generate accurate error indication signals, even with limited error correction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BCH decoder is used for error detection and correction in DTMB standard, then decoding can be performed, but error detection and correction capability is poor leading to unreliable error indication
Solution Approach 1:
An error detection unit is introduced as an intermediary component between the outer-code decoder and the backend processor. This unit performs additional error detection on the decoded data and generates accurate error indication information, mediating the unreliable output of the BCH decoder to provide reliable error status to the backend processor.
Solution Approach 2:
The error detection unit provides feedback about the actual error status of decoded data by performing parity checks or other error detection codes. This feedback mechanism allows the system to identify when the BCH decoder has failed to detect or correct errors, enabling reliable error indication despite the decoder's limitations.
2Device complexity
If BCH decoder with limited correction capability is used, then device complexity is reduced, but error correction performance deteriorates
Solution Approach 1:
The system merges multiple error handling mechanisms: the BCH decoder's correction capability is combined with the error detection unit's verification capability. This combination allows the system to maintain relatively simple decoder hardware while achieving reliable error correction through the collaborative work of both components.
Data Source
AI summary
A signal processing apparatus is provided. The signal processing apparatus includes an inner-code decoder, an outer-code decoder, and an error detection unit. The inner-code decoder decodes an input data stream to generate a first output data stream, wherein the input data stream is coded using a concatenated coding scheme including an outer coding and an inner coding. The outer-code decoder decodes the first output data stream to generate a second output data stream. The error detection unit performs an error detection upon the second output data stream to generate an error detection result. The decision logic sets error indication information of the second output data stream according to at least the error detection result.