ITD Parameter Encoding for Asynchronous Stereo Signal Transmission
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Solution Overview
Problem
Frame-based encoders face inefficiencies in transmitting parameters associated with signal sources, particularly the inter-channel time difference (ITD) parameter, due to the need for high precision and slow updates, leading to waste of bandwidth and synchronization issues.
Innovation Solution
Encoding the ITD parameter using a predetermined bit pattern in the first frame and repeating it in subsequent frames, allowing asynchronous transmission and reducing the number of bits required per frame, thereby achieving efficient transmission and minimizing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ITD parameter is encoded with high precision using over-sampling and reduction in quantization levels, then measurement precision is improved, but device complexity increases due to required filtering and synchronization issues arise
Solution Approach 1:
The patent segments the ITD parameter transmission by dividing it into multiple frames, with only the first frame containing the full precision parameter and subsequent frames containing differential updates. This segmentation allows high precision to be achieved without requiring complex filtering in every frame, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent applies preliminary action by pre-encoding the full precision ITD parameter in the first frame and establishing a reference value before subsequent differential updates are applied. This preliminary encoding eliminates the need for complex real-time filtering in subsequent frames, reducing device complexity while preserving measurement precision.
2Reliability
If the ITD parameter is transmitted every frame, then reliability is improved, but loss of energy increases due to wasted bandwidth when parameters do not change
Solution Approach 1:
The patent extracts only the changed portion of the ITD parameter for transmission in subsequent frames, rather than transmitting the full parameter every frame. By taking out only the differential update values, the patent maintains reliability through regular updates while significantly reducing bandwidth consumption when parameters remain unchanged.
Solution Approach 2:
The patent implements periodic action by transmitting the full ITD parameter in the first frame and then using periodic differential updates in subsequent frames only when changes occur. This periodic transmission pattern ensures reliability through regular updates while minimizing energy loss by avoiding redundant transmissions.
3Ease of operation
If the ITD parameter is updated at frame rate multiples of 50 Hz, then ease of operation is improved, but loss of time increases due to delays in parameter updates
Solution Approach 1:
The patent applies dynamics by making the parameter update frequency adaptive rather than fixed. The system dynamically adjusts between transmitting full parameters and differential updates based on actual parameter changes, allowing faster response to changes while maintaining synchronization ease through the frame-based structure. This dynamic approach reduces update delays while preserving operational ease.
Solution Approach 2:
The patent changes the transmission parameter from fixed full-parameter updates to variable differential updates based on actual parameter changes. This parameter change allows the system to respond more quickly to ITD changes without sacrificing synchronization ease, thereby reducing loss of time while maintaining ease of operation.
Data Source
AI summary
Apparatus (119) for encoding at least one parameter associated with a signal source for transmission over k frames to a decoder comprises a processor (119) which is configured in operation to assign a predetermined bit pattern to n bits associated with the at least one parameter of a first frame of k frames and set the n bits associated with the at least one parameter of each of k−1 subsequent frames to values, such that the values of the n bits of the k−1 subsequent frames represent the at least one parameter. The predetermined bit pattern indicates a start of the at least one parameter.