Wireless Audio Transmitter Digital Signal Processing Architecture
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Solution Overview
Problem
Conventional wireless audio transmission systems face limitations in combining analog and digital signal processing effectively, leading to suboptimal signal-noise ratio, linearity, and hardware complexity, particularly in hybrid transmission systems where analog FM transmission is combined with digital processing.
Innovation Solution
A wireless audio transmission system incorporating an analog/digital converter unit, a digital signal processing unit with compressing/encoding means, and a digital/analog converter unit for both the transmitter and receiver, enabling improved signal processing and transmission through digital implementation of functionalities like modulation/demodulation, audio compression/expansion, and status information encoding/decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hybrid analog/digital transmission system is used, then robust analog FM transmission is achieved, but signal-noise ratio and linearity deteriorate
Solution Approach 1:
The patent replaces analog FM transmission with digital transmission throughout the entire signal path. The transmitter converts audio signals to digital format using ADC, processes them digitally with compression and error correction coding, and transmits as digital symbols. The receiver performs digital demodulation, error correction decoding, and DAC conversion. This complete digitalization eliminates the analog FM stage, thereby improving signal-noise ratio and linearity while maintaining transmission reliability through digital error correction mechanisms.
2Ease of manufacture
If hybrid analog/digital transmission system is used, then simplicity of implementation is achieved, but hardware complexity increases
Solution Approach 1:
The patent merges the analog and digital processing stages into a unified digital transmission system. By eliminating the separate analog FM transmission section and integrating all processing (ADC, digital signal processing, modulation, demodulation, DAC) into a cohesive digital architecture, the system reduces the number of discrete hardware components and interfaces between analog and digital domains, thereby reducing overall hardware complexity despite the advanced digital processing requirements.
Solution Approach 2:
The digital signal processing unit performs multiple functions including audio compression, error correction coding, modulation symbol generation, and in the receiver, demodulation, error correction decoding, and digital filtering. This multi-functional digital processor replaces multiple specialized analog circuits, reducing hardware complexity through functional integration while maintaining comprehensive signal processing capabilities.
3Adaptability or versatility
If digital signal processing is added to analog FM transmission, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a fully digital transmission system where all processing parameters (compression ratios, error correction codes, modulation schemes, sampling rates) can be dynamically adjusted through software configuration. The digital signal processing unit can be reprogrammed to adapt to different audio sources, transmission conditions, and quality requirements without hardware modifications. This dynamic adaptability is achieved through software-defined processing that replaces fixed analog circuitry, managing complexity through programmability rather than hardware diversity.
Data Source
AI summary
There is provided a transmitter for a wireless audio transmission system comprising at least one analog/digital converter unit for analog/digital conversion of the analog audio signals to be transmitted, at least one digital signal processing unit with a compressing/encoding device for compressing and encoding the digitized signal to be transmitted, a digital/analog converter unit for digital/analog conversion of the digital output signals of the digital signal processing unit into analog signals, and a transmitting unit for wirelessly transmitting the output signals of the digital/analog converter unit. There is further provided a receiver for a wireless audio transmission system comprising a receiving unit for receiving wirelessly transmitted analog HF signals, an intermediate frequency unit for mixing the HF signals onto intermediate frequency signals, at least one analog/digital converter unit for analog/digital conversion of the wirelessly received signals, at least one digital signal processing unit with an expanding/decoding device for expanding and decoding the signals digitised by the at least one analog/digital converter unit, and at least one digital/analog converter unit for converting the digital output signals of the digital signal processing unit into analog signals.