Multipoint Control Unit Bit Stream Selection for Audio Quality
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Solution Overview
Problem
The existing technique for multipoint phone conferencing using high-compression coding schemes in mobile communication leads to significant degradation of sound quality due to tandem connection of paired coding and decoding, increasing operation processing and memory requirements in the multipoint control unit.
Innovation Solution
A multipoint control method that selects one or two points from multiple communication terminal apparatuses to generate and output bit streams, using a combination of monaural codes and extension codes to reduce the processing and memory load, allowing for efficient sound signal transmission without degrading sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-compression coding schemes are used in multipoint phone conferencing with tandem connection of paired coding and decoding, then compression ratio is improved, but sound quality significantly degrades and operation processing amount and memory amount increase
Solution Approach 1:
The patent segments the bit stream into multiple independent channels, each carrying coded sound signals from different terminal apparatuses. Instead of decoding all channels and re-encoding (tandem connection), the system selectively transmits specific channel bit streams directly to destination terminals. This segmentation eliminates the quality degradation caused by repeated coding-decoding cycles while maintaining high compression ratios through efficient channel-based data organization.
2Reliability
If tandem connection of paired coding and decoding is used for all points, then complete sound signal transmission is achieved, but operation processing amount and memory amount of multipoint control unit significantly increase
Solution Approach 1:
The patent extracts and transmits only the necessary bit stream components directly from source to destination without requiring full decoding and re-encoding at the multipoint control unit. By selecting and forwarding specific channel bit streams based on communication needs, the system maintains transmission completeness while dramatically reducing the processing burden and memory requirements of the multipoint control unit.
3Productivity
If a large number of decoding processes and coding processes are performed, then all sound signals are processed, but the required memory amount of multipoint control unit increases
Solution Approach 1:
The patent transitions from a time-domain processing approach (sequential decoding and re-encoding of all channels) to a channel-domain approach where multiple independent bit stream channels are organized and selectively transmitted. This dimensional change allows the system to maintain comprehensive sound signal processing capability while reducing memory requirements, as the multipoint control unit stores and manages channel identifiers and routing information rather than full decoded sound signals for all channels.
Data Source
AI summary
A technique is provided that can reduce degradation of the sound quality due to a tandem connection of paired coding and decoding, and can reduce the operation processing amount and the required memory amount of a multipoint control unit. In multipoint connection between terminals of a plurality of communication networks (for example, a fixed phone line and a mobile phone line) having different communication capacities, when a multichannel coding including a monaural coding scheme of a communication network having a smaller communication capacity is used in a communication network having a larger communication capacity to transmit sounds of a plurality points to the communication network terminal having the larger communication capacity, control is exercised such that monaural codes of the plurality points are output.