Advanced parameter encoder with environmental filter capability
AssigneeTRW Inc.
InventorMark E. Noneman
Life of this patent
Estimating the term…
Abstract
In a channelized receiver there is an environmental filter that is used to identify pulse descriptor words that are to be eliminated, tagged for special interest or identifying certain pulse descriptor words that will be accepted causing all other pulse descriptor words to be rejected. The environmental filter has a programmable range and resolution giving the filter a wide flexibility in the identification of a variety of characteristics that can be contained in a pulse descriptor word.
Claims19
An environmental filter comprising:
- input means for accepting digital data,
- range and resolution means, connected to said input for accepting the digital data in consecutive bits from said input, said range and resolution means for selecting at least one consecutive string of bits of variable size and having a variable starting point contained within said consecutive bits on said input means, the output of said range and resolution means having fewer digital bits than the input to said range and resolution means.
The environmental filter of claim 4 wherein:
- the input information to said range and resolution means comprises digital data from a pulse descriptor word.
An environmental filter for a digital parameter encoder which generates pulse descriptor words (PDWs) including a plurality of strings of consecutive digital bits each of said plurality of strings of consecutive digital bits representing a signal characteristic, comprising:
- transform means for receiving said plurality of strings of consecutive bits and for transforming each string of said plurality of strings of consecutive digital bits into a transformed string of bits;
- and
- data selection means, coupled to said transform means, for selecting consecutive bits of variable length from said transformed strings and for combining said selected consecutive bits into a characteristic comparison string.
An environmental filter for a digital parameter encoder which generates pulse descriptor words (PDWs) including a plurality of strings of consecutive digital bits each of said plurality of strings of consecutive digital bits representing a signal characteristic, comprising:
- a plurality of transform modules each for receiving one of said plurality of strings of consecutive digital bits and for transforming and reducing said one of said strings of consecutive digital bits into a transformed string of digital bits having fewer digital bits;
- a data selecter, coupled to said plurality of transform modules, for selecting at least one bit from at least two of said transformed strings to form a characteristic comparison string;
- and
- look-up table, coupled to said data selecter, for storing filter characteristic strings, for comparing said characteristic comparison string to said filter characteristic strings, and for generating a match signal if each bit of said characteristic comparison string matches one of said filter comparison strings.
A method of filtering signal characteristics of pulse descriptor words (PDWs) generated by a digital parameter encoder, wherein each of said signal characteristics comprises a string of consecutive digital bits, comprising the steps of:
- receiving said plurality of signal characteristics;
- transforming and reducing each string of consecutive digital bits of said plurality of signal characteristics into a transformed string of digital bits having fewer digital bits;
- selecting consecutive bits from said transformed strings;
- combining said selected consecutive bits into a characteristic comparison string;
- comparing said characteristic comparison string to stored filter characteristic strings;
- and
- generating a match signal if each bit of said characteristic comparison string matches one of said filter comparison strings.
Dependencies are inferred from the claim text.