Circuits and Methods for Decoding Amplitude Modulated Data Signals from Large Amplitude Sine Wave Carrier

摘要

A digital load side transmission lighting control apparatus has at one least control gear for controlling at least one lighting source. The control gear includes a period timer to establish an inter-transition time period between each transition within each data packet frame. An inter-transition comparator is in communication with the period timer and configured to compare each of the inter-transition periods with valid inter-transition periods between each transition of the bi-phase encoded data for determining if the inter-transition periods represent valid patterns or are an error has occurred. A data extractor is configured to receive valid bi-phase encoded data from the inter-transition comparator for extracting transmitted data from within the data packet frames. A command formatter is configured to receive the extracted frame data from the data extractor for assembling the telegram bit data pattern for transfer for the subsequent processing.

主权项

1. A circuit for decoding encoded digital data extracted from a low frequency, large amplitude carrier signal that is amplitude modulated with the higher frequency, encoded digital data comprising:
a period timer to establish an inter-transition time period between each transition within each data packet frame wherein, the inter-transition time period is the time between each transition of the bi-phase encoded data between a first data level to a second level and between the second data level and the first data level; an inter-transition comparator in communication with the period timer and configured to compare each of the inter-transition periods with valid inter-transition periods between each transition of the bi-phase encoded data for determining if the inter-transition periods represent valid patterns or are an error; a data extractor configured to receive valid bi-phase encoded data from the inter-transition comparator for extracting transmitted data from within the data packet frames; a command formatter configured to receive the extracted frame data from the data extractor for assembling the telegram bit data pattern for transfer for the subsequent processing.