Portable Radio Volume Control for Vehicle Feedback Prevention
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Solution Overview
Problem
Individuals using both vehicle-mounted and portable two-way radios face feedback issues when switching from portable to mobile radios, requiring manual volume adjustment to prevent voice message pickup and feedback.
Innovation Solution
A communications system with presence-sensing and power-sensing means that automatically adjust the audio volume of the portable radio when the user is seated in the vehicle and the mobile radio is powered on, using a volume control arrangement and receiver to lower the volume level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the portable radio volume is kept at preset level when returning to vehicle, then communication capability is maintained, but feedback occurs during mobile radio transmissions
Solution Approach 1:
The system performs preliminary action by automatically lowering the portable radio volume before the user manually needs to adjust it. The presence sensor detects when the user enters the vehicle and the system proactively reduces volume to prevent feedback, eliminating the need for manual intervention and ensuring seamless transition between radios.
Solution Approach 2:
The system uses feedback from presence sensors and mobile radio status sensors to automatically control portable radio volume. When the sensor detects the user is in the vehicle and mobile radio is active, the system feeds back by lowering portable radio volume, and when conditions change, it restores volume to preset levels.
2Object-generated harmful factors
If manual volume adjustment is required when switching radios, then feedback is prevented, but operational complexity increases
Solution Approach 1:
The system performs self-service by automatically detecting user presence and mobile radio status, then autonomously adjusting portable radio volume without user intervention. The presence sensor and mobile radio sensor monitor conditions and the control system automatically executes volume adjustments, making the system self-regulating and eliminating manual operation requirements.
Solution Approach 2:
The system introduces an intermediary automatic control mechanism between the user and radio volume control. Instead of direct manual adjustment, sensors and control circuits act as intermediaries that detect conditions and automatically adjust volume, simplifying user interaction while maintaining feedback prevention.
3Ease of operation
If automatic volume control is implemented, then ease of operation improves, but device complexity increases
Solution Approach 1:
The system achieves multi-functionality by using the existing mobile radio's presence detection capability for dual purposes: both for determining when to activate mobile radio communication and for controlling portable radio volume. This universal approach leverages existing sensors and control circuits to perform multiple functions, reducing the need for separate dedicated components.
Solution Approach 2:
The system merges the volume control function with the existing mobile radio control system. The presence sensor and control circuits that manage mobile radio activation are combined with portable radio volume control, creating an integrated system that reduces overall complexity compared to having separate independent control mechanisms.
Data Source
AI summary
In a communications system for an individual who has access to a vehicle-mounted two-way radio and a portable two-way radio which includes a speakermic having a speaker through which audible messages are transmitted for the individual to hear, there is provided a volume control arrangement associated with the speakermic through which the audio volume of the speakermic speaker can be adjusted. The system also includes a transmitter for transmitting a signal to the volume control arrangement that the individual is seated in the vehicle, and further includes a transmitter for transmitting a signal to the volume control arrangement that the mobile radio is energized. A receiver is associated with the volume control arrangement of the speakermic so that upon receipt of the signals transmitted from the two transmitters, the audio volume of the speaker of the speakermic is automatically lowered.