Backwards Compatible Speech Codec Payload Format
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Solution Overview
Problem
Introducing new speech codecs into telecommunication systems is challenging due to interoperability issues with legacy equipment, which often requires additional transcoders or complex capability exchanges, leading to increased costs and potential speech quality degradation.
Innovation Solution
A backwards compatible payload format is introduced, where a new speech codec is embedded within the bitstream of a legacy codec, using unused bits as a compatibility indicator, allowing legacy decoders to extract the familiar payload while ignoring additional enhancement layers, and new decoders can unpack these layers for improved quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transcoders are provisioned in media gateways to translate between new and legacy coding formats, then interoperability between new and legacy equipment is achieved, but network investment and maintenance costs increase
Solution Approach 1:
The patent embeds the new codec payload within the legacy codec payload structure, nesting the enhanced coding format inside the familiar legacy format. This allows legacy decoders to extract and process only the legacy portion while new decoders can access both the legacy and enhanced portions, eliminating the need for separate transcoder equipment.
2Adaptability or versatility
If transcoders are provisioned in media gateways to translate between new and legacy coding formats, then interoperability between new and legacy equipment is achieved, but speech quality degradation occurs
Solution Approach 1:
By nesting the new codec payload within the legacy codec payload, the patent enables direct transmission of high-quality encoded speech without intermediate transcoding operations. Legacy decoders process only what they need, while new decoders utilize the full enhanced payload, preserving speech quality throughout the transmission chain.
3Adaptability or versatility
If capability exchange between terminals is implemented prior to call to identify common codec, then interoperability is achieved, but this method is not always possible in scenarios such as multi-party conferencing, hand-over scenarios, and voice messaging
Solution Approach 1:
The patent creates a universal payload format that functions both as legacy codec payload and as enhanced codec payload simultaneously. The payload structure is designed to be universally compatible, allowing any decoder (legacy or new) to process the payload according to its capabilities without requiring prior capability exchange or negotiation.
4Adaptability or versatility
If complete set of new and legacy codecs is provided in terminals, then interoperability is achieved, but implementation and technology licensing costs increase
Solution Approach 1:
By nesting the new codec payload within the legacy codec payload structure, the patent enables terminals to implement only the new codec while maintaining compatibility with legacy systems. The nested structure allows a single implementation to serve multiple codec requirements, reducing implementation complexity and licensing costs.
Data Source
AI summary
In a method of providing a backward and forward compatible speech codec payload format, performing the steps of providing a RTP package. Subsequently, including payload according to a first codec into the provided RTP package, and appending payload according to a second codec into the provided RTP package. In addition, locating at least one unused bit in the included first codec payload, and designating the located at least one unused bit as a codec compatibility bit. Finally, utilizing the designated at least one codec compatibility bit to provide an indication of the presence of the appended second codec payload.