Remote Terminal IF Signal Demodulation for Wireless Frequency Tuning
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Solution Overview
Problem
In communication systems that enable remote control of wireless devices, the tuning operation of adjusting the reception frequency is difficult due to a time lag between user adjustments and the reception of demodulated Audio Frequency signals, making it challenging to perform fine frequency adjustments at the remote terminal.
Innovation Solution
A communication system that includes a wireless device and a remote terminal connected via a network, where the remote terminal demodulates Intermediate Frequency signals and adjusts its local frequency based on user instructions, allowing for immediate output of Audio Frequency signals and adjusting the wireless device's local frequency accordingly, thereby reducing the time lag and facilitating the tuning operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the remote terminal waits to receive demodulated Audio Frequency signals from the wireless device for frequency adjustment, then the wireless device can operate autonomously, but a time lag occurs between user adjustments and signal reception making fine frequency adjustments difficult
Solution Approach 1:
The remote terminal performs preliminary demodulation of the IF signal locally to generate Audio Frequency signals before the wireless device completes its full demodulation process. This preliminary action allows the remote terminal to provide frequency adjustment feedback to the user without waiting for the wireless device's demodulated signal, thereby eliminating the time lag and enabling real-time frequency tuning operations.
2Speed
If the remote terminal demodulates IF signals locally and outputs Audio Frequency signals immediately, then the response time for frequency adjustments is reduced, but the system complexity increases
Solution Approach 1:
The remote terminal creates a copy of the IF signal transmitted by the wireless device and performs demodulation on this copied signal locally. By working with a copy rather than requiring the original signal flow to complete, the remote terminal can generate Audio Frequency signals independently and immediately, achieving fast response times while maintaining a manageable system architecture through signal duplication.
Data Source
AI summary
A wireless-device-end communicator transmits, to a remote-end communicator, an IF signal and a wireless-device-end AF signal, the wireless-device-end AF signal being generated by demodulating the IF signal on a basis of a wireless-device-end local frequency. A remote-end controller starts a tuning mode when an instruction obtainer obtains the start instruction for the tuning mode, and adjusts a remote-end local frequency in accordance with the obtained adjustment instruction. A remote end demodulator demodulates the received IF signal on a basis of the remote-end local frequency, and outputs a remote-end AF signal. An outputter outputs the remote-end AF signal in the tuning mode, and outputs the wireless-device-end AF signal in a normal mode. At an end of the tuning mode, the wireless-device-end local frequency is adjusted in such a way that the reception frequency of a wireless device becomes consistent with the reception frequency indicated by the last adjustment instruction.