Variable spectral response FIr filter and filtering method
First Claim
Patent Images
1. An apparatus for providing a filtered information signal in a transmission signal gated transmitter comprising:
- gating means for receiving an information signal and a predefined filter mask signal for use in masking out portions of said information signal, and for selecting portions of said information signal for transmission as a gated information signal in response to said filter, mask signal; and
filtering means for receiving and filtering said gated information signal using a predetermined filter format.
0 Assignments
0 Petitions
Accused Products
Abstract
A method and system, for use in a communication system in which data is transmitted in data frames of predetermined time duration, for the positioning of the data within the data frames for transmission. A computation circuit computes according to the deterministic code a pseudorandom position for the data within each data frame. A positioning circuit positions the data within each data frame in the computed position.
42 Citations
39 Claims
-
1. An apparatus for providing a filtered information signal in a transmission signal gated transmitter comprising:
-
gating means for receiving an information signal and a predefined filter mask signal for use in masking out portions of said information signal, and for selecting portions of said information signal for transmission as a gated information signal in response to said filter, mask signal; and filtering means for receiving and filtering said gated information signal using a predetermined filter format. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An apparatus for providing a filtered information signal in a transmission signal gated transmitter comprising:
-
a signal gate having a first input for receiving an information signal and a second input for receiving a filter mask signal for masking out portions of said information signal, and having an output for providing a gated information signal by selecting portions of said information signal in response to said filter mask signal; and a filter having an input for receiving said gated information signal and an output for providing a filtered signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method for providing a filtered information signal in a transmission signal gated transmitter comprising the steps of:
-
receiving an information signal; receiving a predefined filter mask signal for use in masking out portions of a signal; selecting portions of said information signal for transmission as a gated information signal in response to said filter mask signal; and filtering said gated information signal in accordance with a bandlimiting filter format. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
-
-
31. A FIR filter with variable spectral response comprising:
-
counter means for counting to a predetermined maximum value on a cyclic basis; sequence generator means for receiving said counter means count and generating a plurality of sequences in accordance with said count; sequence selector means for selecting ones of said plurality of sequences and for combining said selected sequences to provide said filter coefficients; and filtering means for receiving an information signal and filtering said information signal using said filter coefficients. - View Dependent Claims (32, 33)
-
-
34. A FIR filter with variable spectral response comprising:
-
a coefficient generator having an output for providing a set of filter coefficients having values that vary on a cyclic basis comprising; a counter having an output for providing count values over a predetermined repeated cycle so as to provide cyclic count values; a sequence generator having an input for receiving said cyclic count and having an output for providing a plurality of sequences in accordance with said cyclic count values; and a sequence selector having an input coupled to said sequence generator output, being configured to select and combine ones of said plurality of sequences, and having an output for providing said varying filter coefficients; and a filter having a first input for receiving an information signal and a second input for receiving varying filter coefficients, and having an output for providing a filtered information signal. - View Dependent Claims (35, 36)
-
-
37. A method for filtering an information signal with variable spectral response comprising the steps of:
-
providing count values over a predetermined repeated cycle so as to provide cyclic count values; generating a plurality of sequences one in accordance with each cyclic count value; selecting ones of said plurality of sequences; combining said selected sequences to provide filter coefficients having values that vary on a cyclic basis; and filtering said information signal using said filter coefficients. - View Dependent Claims (38, 39)
-
Specification