Parallel Acquisition Circuits for Faster TV Channel Scanning
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Solution Overview
Problem
Conventional television receivers spend excessive time scanning channels in mixed-format environments due to sequential digital and analog demodulation attempts, which prolongs channel acquisition and stability testing.
Innovation Solution
The implementation of a system with a first and second acquisition circuit, along with a controller, that simultaneously attempts digital and analog demodulation for each channel, terminating the process when successful acquisition is indicated and moving to the next channel upon unsuccessful acquisition, thereby reducing overall scanning time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential digital and analog demodulation attempts are used for channel scanning, then reliability of format detection is improved, but channel scanning time increases excessively
Solution Approach 1:
The system performs preliminary actions by attempting both digital and analog demodulation in parallel from the start, rather than sequentially. The controller initiates both demodulation circuits simultaneously on each channel, gathering format detection results from both approaches at the same time, which resolves the contradiction by eliminating the sequential waiting time while maintaining reliable format detection through both methods.
Solution Approach 2:
The system maintains continuity of useful action by keeping both digital and analog demodulation circuits operating in parallel throughout the scanning process. Instead of stopping one demodulation attempt to perform the other, both circuits continue their useful action simultaneously on each channel, maximizing resource utilization and minimizing total scanning time while ensuring reliable format detection through continuous parallel operation.
2Measurement precision
If both digital and analog demodulation are attempted sequentially for each channel, then format detection accuracy is improved, but productivity of channel scanning decreases
Solution Approach 1:
The controller performs preliminary action by initiating both digital and analog demodulation attempts simultaneously on each channel before determining the final format. This parallel preliminary action allows the system to gather accurate format detection data from both demodulation approaches at the same time, maintaining high measurement precision while doubling the productivity compared to sequential methods.
Solution Approach 2:
The system transitions from a one-dimensional sequential approach to a two-dimensional parallel approach by operating digital and analog demodulation circuits simultaneously on each channel. This dimensional change in the scanning process allows format detection accuracy to be maintained through both methods while productivity increases because both demodulation attempts occur in the same time period rather than one after the other.
3Device complexity
If sequential scanning of digital and analog formats is performed, then device complexity is reduced, but scanning time is prolonged
Solution Approach 1:
The system applies universality by designing the demodulation apparatus to perform multiple functions simultaneously - both digital and analog demodulation occur in parallel using shared resources where possible. The controller manages both demodulation circuits and processes results from both formats, making the system multi-functional rather than requiring separate dedicated systems for each format, thus maintaining reasonable device complexity while dramatically reducing channel acquisition time through parallel operation.
Data Source
AI summary
Apparatuses and methods for scanning channels in a television signal receiver. The apparatuses generally include a first acquisition circuit, a second acquisition circuit, and a controller. The first acquisition circuit is generally configured to determine, during a first time period, whether a selected radio frequency channel has a first format and to produce a first acquisition indicator in response thereto. The second acquisition circuit is generally configured to determine, during a second time period overlapping the first time period, whether the selected radio frequency channel has a second format and to produce a second acquisition indicator in response thereto. The controller is generally configured to scan a plurality of radio frequency channels by operating the first acquisition circuit and the second acquisition circuit for each one of the plurality of radio frequency channels. Embodiments advantageously provides for faster scanning and acquisition of television signals in a mixed-format (e.g., analog and digital) television distribution environment.