In-Band Modem Pulse Mapping for Speech Codec Data Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication systems face challenges in efficiently transmitting non-speech data through speech codecs due to coding inefficiencies, particularly when dealing with signals that do not exhibit periodic or noise-like characteristics, leading to severe distortion and limited data rate capabilities.
Innovation Solution
The implementation of an in-band modem system that processes input data symbols into pulse signals, shapes them, and encodes them using a speech codec, along with techniques such as generating noise-like sequences robust to speech frame errors and synchronizing signals to ensure reliable transmission and reception of non-speech information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-speech data is transmitted through speech codecs using conventional methods, then the transmission can be implemented, but severe distortion occurs and data rate is limited
Solution Approach 1:
The patent transforms non-speech data into speech-like parameters (pitch, gain, temporal envelope) that match the expected characteristics of speech signals. By changing the representation parameters of the data to mimic speech characteristics, the vocoder processes the data without introducing severe distortion, thereby resolving the contradiction between transmission reliability and information loss.
Solution Approach 2:
The patent introduces an intermediary speech synthesis process between the non-speech data and the vocoder. The data is first converted into speech-like parameters, then synthesized into speech-like waveforms, and finally encoded by the vocoder. This intermediary transformation layer allows the vocoder to process the signal as expected while preserving the original data information.
2Adaptability or versatility
If speech codecs are used for non-speech data transmission, then infrastructure utilization is improved, but coding inefficiencies reduce data rate capabilities
Solution Approach 1:
The patent makes the speech codec infrastructure universal by enabling it to handle both speech and non-speech data through the same encoding pathway. The system extracts speech-like parameters from any input data, allowing the vocoder to function as a universal encoder for different data types, thereby improving infrastructure utilization without sacrificing data rate through dedicated protocols.
3Productivity
If conventional data transmission methods are used, then data rate can be maintained, but infrastructure requirements increase and economic constraints are not met
Solution Approach 1:
The patent enables the existing speech infrastructure to serve dual purposes (speech and data transmission) through self-service. The speech codec automatically adapts to encode non-speech data by extracting speech-like parameters, eliminating the need for separate data transmission infrastructure. This allows conventional systems to maintain data rate capabilities while avoiding additional infrastructure investments.
Data Source
AI summary
A system is provided for transmitting information through a speech codec (in-band) such as found in a wireless communication network. A modulator transforms the data into a spectrally noise-like signal based on the mapping of a shaped pulse to predetermined positions within a modulation frame, and the signal is efficiently encoded by a speech codec. A synchronization sequence provides modulation frame timing at the receiver and is detected based on analysis of a correlation peak pattern. A request/response protocol provides reliable transfer of data using message redundancy, retransmission, and/or robust modulation modes dependent on the communication channel conditions.