Reception Apparatus Buffer Reduction via PLP Presence Bit Strings
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Solution Overview
Problem
Conventional reception apparatuses for digital terrestrial broadcasting require large buffer sizes to hold decoding results, particularly due to the detailed nature of physical layer pipe (PLP) identification information, which increases the size of the holding unit.
Innovation Solution
A reception apparatus that uses a holding unit to store physical layer pipe presence/absence bit strings, allowing for reduced buffer size by assigning each PLP a single bit, and includes units for receiving, setting, and decoding PLP information, enabling efficient processing and reducing buffer size requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed PLP identification information is held in the buffer, then decoding accuracy is improved, but buffer size increases
Solution Approach 1:
The patent extracts only the essential presence/absence information of PLPs from the complete PLP identification data. Instead of buffering detailed PLP identification information (which would require 64×6 bits for maximum 64 PLPs), the system extracts a simplified bit string indicating only which PLPs are present. This extraction principle reduces buffer requirements while maintaining sufficient information for decoding operations.
Solution Approach 2:
The patent changes the parameter representation from detailed PLP identification information to a simplified presence/absence bit string. By transforming the data format from multi-bit PLP identifiers to single-bit presence indicators, the system achieves the same decoding functionality with significantly reduced buffer size. This parameter transformation maintains decoding accuracy while optimizing storage requirements.
2Productivity
If parallel processing of preamble decoding and PLP decoding is implemented, then processing speed is improved, but buffer size increases
Solution Approach 1:
The patent extracts minimal necessary information (presence/absence bits) for parallel processing between the control circuit and signal processing unit. By taking out only the essential PLP presence information rather than complete decoding results, the system enables parallel processing while keeping the buffer size small. This extraction approach allows the signal processing unit to receive sufficient information to proceed with PLP decoding without requiring large buffers.
3Adaptability or versatility
If maximum number of PLPs (64) are supported, then system versatility is improved, but buffer capacity requirements increase
Solution Approach 1:
The patent creates a universal presence/absence bit string that can accommodate any number of PLPs up to the maximum (64) using a fixed 64-bit structure. Each bit position corresponds to a potential PLP, allowing the system to support variable numbers of PLPs universally without requiring different buffer sizes. This multi-functional bit string structure provides versatility in PLP support while maintaining constant, minimal buffer capacity requirements.
Data Source
AI summary
A reception apparatus that decodes a preamble reduces the size of a buffer that holds a decoding result. A holding unit holds a plurality of bits to each of which physical layer pipe identification information is assigned as a physical layer pipe presence/absence bit string. A reception unit receives a predetermined number of physical layer pipes that do not exceed the number of bits of the physical layer pipe presence/absence bit string and the physical layer pipe identification information of each of the predetermined number of physical layer pipes. A setting unit sets the value of the bit corresponding to the received physical layer pipe identification information of the physical layer pipe presence/absence bit string to one of two values, and sets the value of a non-corresponding bit to another of the two values. A decoding processing unit performs processing for decoding the physical layer pipe corresponding to the bit of the one value.