Gateway Apparatus Speech Data Error Concealment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional gateway apparatuses connecting line-switched and packet-switched networks face issues with maintaining speech quality and minimizing delay, particularly due to errors in unique word detection and buffer management, leading to potential sound breaks and increased speech delay.
Innovation Solution
A gateway apparatus with decision and control means to determine if encoded data is delayed or lost, performing error concealment processing or discarding it to maintain consistent data transmission, thereby minimizing signal deterioration and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encoded data is buffered to handle delay fluctuations in packet-switched networks, then reliability of speech transmission is improved, but speech delay increases
Solution Approach 1:
The patent applies preliminary action by detecting delays or losses in encoded speech data before they are transmitted to the destination terminal. The gateway apparatus identifies delayed or lost packets in advance and generates replacement encoded data proactively, allowing the destination terminal to perform error concealment without excessive waiting time. This reduces speech delay while maintaining transmission reliability.
2Reliability
If error concealment processing is performed at the destination terminal, then speech quality deterioration is minimized, but communication complexity increases
Solution Approach 1:
The gateway apparatus acts as an intermediary between the packet-switched network and the destination terminal. It detects delayed or lost encoded speech data, generates replacement encoded data, and transmits it to the destination terminal. This intermediary function simplifies the overall communication complexity by centralizing the error detection and replacement logic in the gateway, while still enabling error concealment processing at the destination terminal to maintain speech quality.
3Measurement precision
If unique word detection is performed to separate multiplexed data, then data separation accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by detecting delays or losses in encoded speech data before they are transmitted to the destination terminal. The gateway apparatus identifies delayed or lost packets in advance and generates replacement encoded data proactively, allowing the destination terminal to perform error concealment without excessive waiting time. This reduces speech delay while maintaining transmission reliability.
Data Source
AI summary
A gateway apparatus for conducting connection between different types of communication networks, that are a line-switched network and a packet-switched network, there are provided a method and an apparatus in which sound breaks otherwise caused by delay or loss of speech encoded data is eliminated and deterioration of the speech quality is minimized to assure short delay in speech communication. A speech data processing circuit of the gateway apparatus compares the number of speech encoded data actually acquired with an expected value. The speech data processing circuit packetizes the so generated speech encoded data, along with the speech encoded data, to send the packetized data from a transmission circuit to the packet-switched network. The resulting data is sent from a data multiplexing circuit and a line-switched network terminating circuit to the line-switched network.