Set-Top Box Wideband Voice Processing Jitter Buffer Control
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Solution Overview
Problem
Current Internet Set-Top Box (ISTB) systems lack the capability to process various wideband speech frame payloads in Real-Time Transport Protocol (RTP) packet payloads and maintain synchronization during conference calls, especially when using wideband voice codecs, which affects the quality of wideband IP telephony services.
Innovation Solution
The system includes a wideband voice processor that discriminately outputs voice codec frames as either narrowband or wideband, controls a jitter buffer to manage voice codec frames, and uses Session Initiation Protocol (SIP) for call setup and tear-down, along with a packet transceiver that analyzes and generates RTP packets to ensure high-quality wideband voice communication and synchronization in conference calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wideband codec is used to improve audio quality, then the frequency range and audio quality are improved, but the complexity of processing various speech frame payloads in RTP packets increases
Solution Approach 1:
The patent segments the RTP packet processing into distinct functional modules: a packet transceiver for receiving RTP packets, an RTP packet payload analyzer for analyzing payload types, and a wideband voice processor for processing wideband speech frames. This segmentation allows the system to handle different payload types (narrowband and wideband) through specialized processing paths, reducing overall processing complexity while maintaining wideband audio quality.
Solution Approach 2:
The patent changes the parameter of codec type from narrowband to wideband, which expands the frequency range from 300-3.4 kHz to 50-7 kHz. The system adapts to this parameter change by implementing conditional processing logic that identifies wideband payloads in RTP packets and routes them to appropriate wideband processing functions, thereby managing the increased complexity through parameter-based differentiation.
2Illumination intensity
If wideband speech frame payloads are processed to improve service quality, then the audio quality is improved, but the lack of technology for processing various payloads causes synchronization issues
Solution Approach 1:
The patent implements feedback mechanisms through the RTP packet payload analyzer that continuously monitors and identifies the type of speech frame payload in incoming packets. This feedback information about payload type (narrowband or wideband) is used to dynamically adjust processing parameters and ensure proper synchronization. The system uses timestamp information and payload type feedback to maintain conference call synchronization across multiple participants.
Solution Approach 2:
The patent performs preliminary analysis of RTP packet payloads before processing, using the RTP packet payload analyzer to identify whether the payload is narrowband or wideband. This preliminary classification allows the system to prepare appropriate processing paths and synchronization parameters in advance, ensuring that wideband speech frames are processed correctly and synchronized properly with other conference call participants before actual audio processing occurs.
3Reliability
If conference call synchronization is maintained to improve service reliability, then call synchronization is improved, but the lack of jitter buffer control technology affects synchronization stability
Solution Approach 1:
The patent introduces a jitter buffer as an intermediary component between the RTP packet receiver and the voice codec processor. The jitter buffer absorbs timing variations and jitter in network arrivals, providing a stable source of speech frames for processing. This intermediary mechanism simplifies synchronization control by decoupling the variable network arrival times from the fixed processing requirements of the voice codec, thereby improving synchronization reliability without requiring complex real-time adjustment mechanisms.
Data Source
AI summary
An Internet Set-Top Box (ISTB) and a method of providing wideband IP telephony services using the ISTB are provided, which are capable of implementing wideband voice communication services using a wideband voice codec, controlling a Real-Time Transport Protocol (RTP) packet payload to process a variety of wideband speech frame payloads, and providing high-quality wideband IP telephony services by controlling a jitter buffer to maintain conference call synchronization.