Signal Processing Apparatus for Digital TV Symbol Rate Detection
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Solution Overview
Problem
In digital television broadcasting, receivers face inefficiencies and performance issues due to the need to sequentially scan a wide range of symbol rates and carrier frequencies to correctly decode digital television signals, which is time-consuming and prone to noise interference.
Innovation Solution
A signal processing apparatus and method that identifies a minimum energy point in the spectral line, using predetermined conditions to determine the symbol rate and carrier frequency offset, thereby eliminating noise regions and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sequential scanning of all symbol rates and carrier frequencies is performed, then complete channel coverage is achieved, but decoding time becomes extremely long
Solution Approach 1:
The patent performs preliminary actions by first scanning only carrier frequencies and identifying spectral lines, then using these spectral lines as starting points for symbol rate detection. This preliminary frequency scanning eliminates the need for exhaustive symbol rate scanning, significantly reducing total decoding time while maintaining complete channel coverage.
Solution Approach 2:
The patent segments the signal detection process into distinct phases: carrier frequency detection followed by spectral line identification, then symbol rate detection based on spectral line characteristics. This segmentation allows each phase to be optimized independently, reducing overall detection time while ensuring comprehensive channel coverage.
2Measurement precision
If spectral analysis is performed to identify symbol rate, then detection accuracy is improved, but noise interference increases
Solution Approach 1:
The patent introduces spectral lines as intermediary elements that bridge carrier frequency detection and symbol rate detection. These spectral lines serve as reliable starting points that are less susceptible to noise, enabling accurate symbol rate detection without directly analyzing noisy spectral data across the entire frequency range.
Solution Approach 2:
The patent extracts spectral lines from the received signal as distinct features that carry symbol rate information. By focusing detection efforts on these extracted spectral lines rather than analyzing the entire spectrum, the method achieves accurate symbol rate detection while minimizing the impact of background noise interference.
Data Source
AI summary
A signal processing apparatus for receiving a spectral line of an original signal includes a starting point determining module, a searching module and a symbol rate determining module. The starting point determining module finds a maximum energy in the spectral line and determines at least one search starting point according to the maximum energy. From the at least one search starting point, the searching module searches along the spectral line towards a region with a lower energy for at least one minimum energy satisfying a predetermined condition. The symbol rate determining module determines a symbol rate of the original signal according to the at least one minimum energy.