FM Transmitter Circuit Seamless Frequency Switching
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Solution Overview
Problem
Existing FM transmitting circuits require users to manually set frequencies, leading to temporary audio signal interruptions and potential noise interference when changing frequencies, causing confusion about device malfunctions.
Innovation Solution
A digital data processing circuit with a setting unit for FM modulated signal generation and an output unit for audio data reproduction, allowing for seamless frequency changes while masking noise interference with a beep sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frequency of the carrier in the FM transmitting circuit is changed by operating the controller, then the frequency setting is updated, but the audio signals are temporarily stopped causing a soundless state
Solution Approach 1:
The system prepares replacement audio data (beep sound or silence) in advance before the frequency change operation. When the user initiates a frequency change, the pre-prepared audio data is immediately output to maintain continuous audio playback without interruption, while the frequency setting is updated in the background.
2Adaptability or versatility
If the audio signals are temporarily stopped during frequency change, then the setting can be updated, but noise from serial data transmission appears in the audible range
Solution Approach 1:
Instead of stopping audio signals which causes harmful noise to become audible, the system converts the transmission period into a beneficial opportunity by outputting pre-prepared beep sounds or silence. This transforms the previously harmful audible noise into a controlled, intentional audio output that masks the serial data transmission noise.
3Adaptability or versatility
If audio signals are stopped for frequency change, then setting update is possible, but user may suspect device malfunction
Solution Approach 1:
The system introduces an intermediary audio output (beep sound or controlled silence) that acts as a mediator between the frequency change operation and the user's auditory perception. This intermediary signal maintains the perception of device normal operation, preventing users from suspecting malfunctions while the frequency setting is being updated in the background.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables frequency adjustments without interrupting audio output, masking noise interference with a beep sound, thus preventing user confusion about device issues.
Implementation Method 1
a setting unit configured to set setting data on an audio signal processing circuit configured to generate an FM modulated signal
Data Source
AI summary
A digital data processing circuit comprising: a setting unit configured to set setting data on an audio signal processing circuit configured to generate an FM modulated signal based on the setting data, the FM modulated signal being a signal to be transmitted wirelessly to an FM radio receiver; and an output unit configured to output audio data for reproducing a predetermined audio signal while the setting unit sets the setting data on the audio signal processing circuit.