Digital Channelizer Switch for Satellite LNB Signal Conversion
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Solution Overview
Problem
Current satellite signal conversion systems face inefficiencies in converting high-frequency satellite signals to intermediate frequencies for decoding, leading to signal loss and requiring multiple cables for channel selection, which increases complexity and cost.
Innovation Solution
The system employs digital signal processing using high-speed analog-to-digital and digital-to-analog converters to downconvert and select satellite signals, reducing power consumption and component costs, and enabling seamless channel switching and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional analog LNB architecture is used for signal conversion, then signal processing capability is maintained, but device complexity and power consumption increase
Solution Approach 1:
The patent replaces traditional analog mechanical signal processing components (mixers, filters, amplifiers) with digital signal processing components (ADC, digital channelizers, DSP, DAC). This substitution reduces device complexity while maintaining or enhancing signal processing capability through software-based processing algorithms.
Solution Approach 2:
The digital channelizer switch architecture allows a single LNB unit to perform multiple functions: signal downconversion, channel selection, and signal routing through digital processing. This multi-functionality reduces the need for separate analog switching components and multiple cables, simplifying the overall system.
2Ease of operation
If multiple cables are used for channel selection in traditional LNB systems, then channel switching capability is achieved, but ease of operation and system simplicity deteriorate
Solution Approach 1:
The patent merges multiple channel selection functions into a single digital channelizer switch that processes all channels through one cable connection. The digital switching mechanism combines what would traditionally require multiple separate cable connections and analog switches into a single integrated digital processing path.
Solution Approach 2:
The digital channelizer switch acts as an intermediary between the analog LNB output and the satellite receiver, performing channel selection and switching functions in the digital domain. This intermediary component eliminates the need for multiple physical cable connections while maintaining full channel switching capability.
3Loss of energy
If high-frequency satellite signals are transmitted through coaxial cables, then signal transmission is achieved, but loss of energy increases with frequency
Solution Approach 1:
The patent applies preliminary action by downconverting the high-frequency satellite signals to lower intermediate frequencies within the LNB before the signals enter the coaxial cable. This frequency conversion is performed in advance to reduce signal loss during transmission through the cable, as lower frequencies experience less attenuation.
Solution Approach 2:
The system changes the frequency parameter of the signal from high RF frequencies to lower intermediate frequencies through the LNB's downconversion process. This parameter change optimizes the signal for cable transmission by reducing the frequency-dependent losses that would otherwise occur with high-frequency signals.
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
This approach significantly reduces power consumption and component costs, allows instantaneous channel switching, and enhances scalability, enabling the construction of single-cable LNBs that can mix multiple content channels efficiently.
Implementation Method 1
a mixer configured to down convert the plurality of content channels to an intermediate frequency signal
Implementation Method 2
a high speed analog to digital converter configured to digitize the intermediate frequency signal
Implementation Method 3
a high speed digital to analog converter configured to generate an analog output signal using the content channel digitally tuned
Data Source
AI summary
Systems and methods are provided for selecting data from intermediate frequency signals, corresponding to received signals (e.g., satellite signals) carrying modulated data, using digital channelizer switches. An example digital channelizer switch may comprise a plurality of high speed analog-to-digital converters configured to digitize the intermediate frequency signals; a plurality of digital channelizers configured to digitally tune data from the digitized intermediate frequency signals; a multiplexer configured to select one or more digitized intermediate frequency signal generated by the plurality of high speed analog-to-digital converters as inputs to the plurality of digital channelizers; and a high speed digital-to-analog converter configured to generate an analog output signal using digitally tuned data by the digital channelizer, from at least one digitized intermediate frequency signal.