Semiconductor DAA Impedance Switching for Circuit Board Downsizing
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Solution Overview
Problem
Conventional communication terminal devices require significant space for two transformers, which hampers space efficiency and increases costs due to the need for larger circuit boards.
Innovation Solution
A communication terminal device utilizing a semiconductor DAA with impedance and direct-current resistance switching capabilities, controlled by respective controllers, to adapt impedance and resistance settings when an external telephone is off-hook, eliminating the need for a high impedance tone detecting transformer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two transformers (communication transformer and tone detection transformer) are mounted on the circuit board, then the device can detect CNG signal and transmit/receive facsimile data, but the space required increases significantly
Solution Approach 1:
The invention extracts and eliminates the tone detection transformer from the system by using a semiconductor DAA with impedance switching capability. The high impedance tone detection function is achieved through software/control logic rather than dedicated hardware, removing the need for the separate transformer component and reducing circuit board area.
Solution Approach 2:
The semiconductor DAA is designed to perform multiple functions: it serves as both the communication transformer for facsimile data transmission and the tone detection device for CNG signal detection. By making the DAA universal and programmable, the patent eliminates the need for separate dedicated components for each function.
2Reliability
If a high impedance tone detection transformer is used to detect CNG signal, then the device can reliably detect calling tones, but the device complexity and component count increase
Solution Approach 1:
The invention replaces the mechanical/electromagnetic transformer-based tone detection system with a semiconductor-based DAA controlled by electrical signals. The physical transformer component is substituted with a solid-state device that can be controlled through impedance switching, simplifying the overall device architecture.
Solution Approach 2:
The patent uses parameter changes in the semiconductor DAA's impedance characteristics to achieve tone detection functionality. By dynamically changing the impedance state of the DAA based on control signals, the system can detect CNG tones without requiring a separate high impedance transformer, reducing device complexity.
3Adaptability or versatility
If two separate transformers are mounted on the circuit board, then the device can perform both communication and tone detection functions, but manufacturing costs increase due to larger circuit board requirements
Solution Approach 1:
The invention merges the communication transformer function and tone detection function into a single semiconductor DAA component. This consolidation reduces the total number of components, simplifies circuit board design, and lowers manufacturing costs while maintaining both communication and tone detection capabilities.
Solution Approach 2:
The semiconductor DAA is designed as a universal component that can perform multiple functions including facsimile data communication and CNG signal detection. This multi-functionality eliminates the need for separate dedicated components, reducing circuit board area and manufacturing complexity.
Data Source
AI summary
A communication terminal devicecapable of being connected with an external telephone and of receiving and transmitting facsimile data from and to a network, includes: an off-hook detector configured to detect an off-hook condition of the external telephone, an semiconductor DAA (Data Access Arrangement) including an impedance switcher configured to switch impedances and a direct-current resistance switcher configured to switch direct-current resistances; an impedance switching controller configured to instruct the impedance switcher to switch the impedances; a direct-current resistance switching controller configured to instruct the direct-current resistance switcher to switch the direct-current resistances, wherein, when the off-hook detector detects the off-hook condition of the external telephone, the impedance switching controller instructs the impedance switcher to switch the impedances and the direct-current resistance switching controller instructs the direct-current resistance switcher to switch the direct-current resistances.