Wireless Microphone Pilot Tone Frequency Coordination
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Solution Overview
Problem
Analog wireless microphone systems face interference issues due to competing wireless devices, necessitating dynamic frequency coordination and identification, which existing systems struggle to manage effectively.
Innovation Solution
A wireless audio transmission system with a central unit that employs a pilot tone signal with higher power than the audio transmission, allowing for time, frequency, or code multiplexing, enabling reliable operation by transmitting information about frequency occupancy and system properties on a pilot channel, facilitating dynamic frequency allocation and coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless microphone system operates in an environment with competing wireless devices, then frequency coordination and identification become necessary to avoid interference, but the system complexity and difficulty of managing dynamic frequency occupancy increase
Solution Approach 1:
The patent introduces a dedicated pilot channel as an intermediary communication path between the central unit and microphone units. This pilot channel carries pilot tones that enable frequency occupancy identification and coordination without complicating the main audio transmission path. The pilot channel acts as a mediator that facilitates frequency management while keeping the audio transmission simple and reliable.
2Reliability
If the pilot tone signal is transmitted with higher power than the audio transmission, then the pilot tone can be detected over a greater range and with higher reliability, but the energy consumption increases
Solution Approach 1:
The patent applies partial action by transmitting the pilot tone signal with higher power than the audio signal only when necessary for reliable detection and coordination. The pilot channel operates independently with optimized power levels for its specific function of frequency occupancy identification, rather than increasing power across all transmission channels. This selective power allocation ensures reliable pilot tone detection while minimizing overall energy consumption.
3Productivity
If time, frequency, or code multiplexing is used for pilot tone transmission, then multiple microphone units can be connected efficiently, but the device complexity increases
Solution Approach 1:
The patent segments the communication resources by introducing a separate pilot channel distinct from the audio transmission channels. This segmentation allows the pilot tones to be transmitted and processed independently using time, frequency, or code multiplexing techniques. By separating the control function (pilot tone transmission) from the data function (audio transmission), the system can support multiple microphone units efficiently while managing complexity through functional separation.
Data Source
AI summary
There is provided a wireless audio transmission system, in particular a wireless microphone system, for wireless audio transmission. The system has at least one wireless microphone unit for detecting audio signals and for wirelessly transmitting the detected audio signals, and a central unit. The central unit has a wireless receiving unit for receiving the wirelessly transmitted audio signals from the wireless microphone units, a pilot tone transmitting unit for transmitting a first pilot tone on a pilot channel, and a pilot tone receiving unit for receiving and processing a second pilot tone signal. The pilot tone signal has information in respect of the wireless transmission between the microphone units and the central unit.