Tuner Baseband Processor Shifts Demodulation to Host CPU
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional broadcast, cable, and satellite television systems require separate hardware for demodulation operations, which increases costs and complexity, as the host CPU is typically not involved in demodulation processes.
Innovation Solution
A tuner system that includes mixers, filters, variable gain stages, analog-to-digital converters, and a baseband processor, where the baseband processor performs partial or no demodulation operations, shifting the demodulation burden to an external processing unit, such as a CPU or GPU, allowing software-based demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate hardware is used for demodulation operations, then demodulation function is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the demodulation function from dedicated hardware and relocates it to software running on the host CPU. The baseband processor in the tuner performs only basic functions like ADC conversion, while the complex demodulation operations are performed by software algorithms on the host processor, eliminating the need for separate hardware demodulation units.
Solution Approach 2:
The patent replaces the mechanical/hardware demodulation system with a software-based approach. Instead of using dedicated hardware circuits for demodulation, the system uses software algorithms executed on the host CPU to perform the same function, substituting physical hardware with software processing.
2Reliability
If separate hardware is used for demodulation operations, then demodulation function is achieved, but cost increases
Solution Approach 1:
The patent extracts the demodulation function from dedicated hardware and relocates it to software running on the host CPU. The baseband processor in the tuner performs only basic functions like ADC conversion, while the complex demodulation operations are performed by software algorithms on the host processor, eliminating the need for separate hardware demodulation units.
Solution Approach 2:
The patent replaces the mechanical/hardware demodulation system with a software-based approach. Instead of using dedicated hardware circuits for demodulation, the system uses software algorithms executed on the host CPU to perform the same function, substituting physical hardware with software processing.
3Device complexity
If host CPU is used for demodulation operations, then hardware requirements are reduced, but processing load on host increases
Solution Approach 1:
The patent segments the signal processing functions into two parts: basic analog-to-digital conversion and filtering are performed by the baseband processor in the tuner, while complex demodulation operations are performed by software on the host CPU. This segmentation allows the tuner to be simpler while leveraging the host's processing power for computationally intensive tasks.
Solution Approach 2:
The patent replaces the mechanical/hardware demodulation system with a software-based approach. Instead of using dedicated hardware circuits for demodulation, the system uses software algorithms executed on the host CPU to perform the same function, substituting physical hardware with software processing.
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 reduces hardware requirements, lowers costs, and enables efficient signal processing by leveraging the increasing processing power of CPUs, making the system more cost-effective and efficient while allowing the use of lower-bandwidth interfaces for data transfer.
Implementation Method 1
a mixer (104, 106) adapted to receive a clock signal generated by a local oscillator (LO) (120)
Implementation Method 2
an intermediate frequency (IF) filter (108, 110)
Implementation Method 3
analog-to-digital converters (ADCs) (116, 118)
Data Source
AI summary
A tuner includes, in part, one or mixers, one or more filters, one or more variable gain stages, one or more analog to digital converters, and a baseband processor. Each filter is responsive to an associated mixer's output signal. Each variable gain stage is responsive to an associated filter's output. Each analog-to-digital converter is adapted to convert the output signal of an associated variable gain stage to a digital signal. The baseband processor is responsive to the digital signal supplied by the analog-to-digital converter(s). The baseband processor is further configured to supply a signal to be demodulated by a processing unit external to the integrated circuit. The baseband processor performs no or a fraction of the required demodulation functions. The processing unit may be a central processing unit or a graphical processing unit.