Buffer Controller for Multi-Channel Codec Signal Management
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Solution Overview
Problem
Existing codecs face challenges in efficiently managing multiple real-time signals in an integrated circuit environment, requiring effective buffer management to prevent overflow and underflow conditions while ensuring seamless processing of audio and video signals.
Innovation Solution
The implementation of a buffer controller with write and read pointer generation modules, memory arbitration, and status signal management to control access to buffer memory, allowing multiple output modules to independently access and process signals in a first-in first-out order, and handle status conditions like empty, full, overflow, and underflow states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple buffers are used to process multiple real-time signals, then signal processing capability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple buffer management functions into a single buffer controller that handles multiple buffers. The controller uses a unified state machine and control logic to manage multiple buffer structures, reducing the need for separate control circuits for each buffer while maintaining the ability to process multiple real-time signals simultaneously.
Solution Approach 2:
The buffer controller is designed as a universal module that can manage multiple buffers for different real-time signals (audio, video, etc.). The same control logic and state machine handle various buffer operations including overflow prevention, underflow detection, and pointer management across multiple buffers, reducing overall system complexity.
2Reliability
If buffer management is implemented to prevent overflow and underflow, then signal processing reliability is improved, but device complexity increases
Solution Approach 1:
The buffer controller implements feedback mechanisms through status flags that continuously monitor buffer states. Overflow and underflow conditions generate status flags that feed back to the control logic, enabling automatic prevention of these conditions without requiring complex external control circuits. The write pointer and read pointer updates are controlled based on these feedback signals.
Solution Approach 2:
The buffer manager performs self-service by automatically detecting and preventing overflow and underflow conditions through its internal state machine. The controller autonomously manages pointer updates, status flag generation, and buffer protection without requiring complex external intervention, thereby improving reliability while minimizing added complexity.
3Productivity
If multiple output modules independently access buffer memory, then processing efficiency is improved, but buffer management complexity increases
Solution Approach 1:
The buffer access mechanism is segmented into independent pointer management for each output module. Each output module has its own read pointer that independently tracks its position in the buffer, allowing simultaneous independent access without requiring complex arbitration logic. The buffer controller manages multiple pointers in parallel, enabling efficient multi-module access.
Solution Approach 2:
The buffer controller acts as an intermediary between multiple output modules and the buffer memory. It manages the read pointers and controls access to buffer data, allowing multiple modules to access the buffer simultaneously in a coordinated manner. This intermediary role simplifies the access management compared to direct module-to-memory connections.
Data Source
AI summary
A buffer controller includes a first write pointer generation module for generating a first write pointer that points to a first sequence of write locations in a buffer memory, that directs an input module to store a sequence of samples of a real-time signal in a buffer memory. A read pointer generation module generates a plurality of read pointers for a corresponding plurality of output modules, wherein each of the plurality of read pointers points to a sequence of read locations in the buffer memory, in a buffer order, that contain the sequence of samples.