Timestamp Generation in Reception Apparatus
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Solution Overview
Problem
The existing reception apparatuses for recording broadcast transport streams require complex and expensive clock recovery circuits to generate time stamps, necessitating a simpler and cost-effective solution for accurate timestamp generation.
Innovation Solution
A reception apparatus that obtains transmission parameters from the received data stream, calculates a time stamp increment value, and updates the timestamp accordingly, allowing for timestamp addition to packets without the need for a clock recovery circuit, utilizing a simple circuit structure and rational number calculations to avoid error accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a clock recovery circuit is used to generate time stamps, then time stamp accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential function of time stamp generation from the complex clock recovery circuit. By identifying that only the time stamp increment calculation is needed for recording purposes, the invention removes the unnecessary clock synchronization components (bit stream parser, PLL circuit) and keeps only the minimal calculation logic required to generate accurate time stamps based on packet intervals.
Solution Approach 2:
The patent replaces the expensive, complex clock recovery circuit with a simple, low-cost calculation-based time stamp generation method. The invention uses basic arithmetic operations on transmission parameters to generate time stamps, effectively substituting a costly hardware solution with an inexpensive computational approach that achieves the same functional goal.
2Measurement precision
If a clock recovery circuit is used to generate time stamps, then time stamp accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces the expensive, complex clock recovery circuit with a simple, low-cost calculation-based time stamp generation method. The invention uses basic arithmetic operations on transmission parameters to generate time stamps, effectively substituting a costly hardware solution with an inexpensive computational approach that achieves the same functional goal.
Solution Approach 2:
The patent extracts the essential function of time stamp generation from the complex clock recovery circuit. By identifying that only the time stamp increment calculation is needed for recording purposes, the invention removes the unnecessary clock synchronization components (bit stream parser, PLL circuit) and keeps only the minimal calculation logic required to generate accurate time stamps based on packet intervals.
3Measurement precision
If rational number calculations are used for time stamp increment, then time stamp accuracy is maintained, but calculation complexity increases
Solution Approach 1:
The patent changes the numerical representation from floating-point to rational numbers (fractions). By expressing time stamp increments as ratios of integers rather than decimal approximations, the invention maintains exact precision throughout calculations while avoiding the complexity of floating-point arithmetic. This parameter change allows accurate time stamp generation using only basic integer operations.
Data Source
AI summary
The present disclosure relates to a reception apparatus, a reception method, and a program for generating a time stamp with a simple circuit structure that is realized at low cost. In one example, a reception apparatus includes a reception unit, an obtaining unit, a time stamp increment value specifying unit, a time stamp calculating unit and a time stamp adding unit. The reception unit receives a data stream formed of a series of packets. The obtaining unit obtains a transmission parameter from the received data stream. The time stamp increment value specifying unit specifies a time stamp increment value corresponding to the obtained transmission parameter. The time stamp calculating unit updates the time stamp by adding the specified time stamp increment value to a previous time stamp, and the time stamp adding unit adds the updated time stamp to the packets configuring the data stream.