Configurable filter and receiver incorporating same

A digital filter comprising:

• first means for receiving a first input signal characterized by a first rate and a second input signal characterized by a second rate, said first rate being a narrowband rate, and said second rate being a wideband rate;
• second means for generating control signals;
• second means for generating control signals;
• third means for selectively configuring said digital filter to operate on said first input signal or said second input signal in accordance with a programmable filter response in response to said control signals and to provide filtered digital output signals in response thereto;
• a first filter block and a second filter block each having two filter banks, one filter bank for producing I signals, and another filter bank for producing Q signals;
• and
• an I/Q output configuration module for selectively combining I and Q signals output by said first filter block and said second filter block into desired filter outputs.

An electronic filter comprising:

• a controller;
• one or more configurable filter blocks;
• first means for configuring said one or more configurable filter blocks to perform different desired filtering operations on input signals of different rates via control signals from said controller, whereby said filter is adapted to handle narrowband signals in a first configuration and wideband signals in a second configuration;
• a first filter block and a second filter block each having two filter banks, one filter bank for producing I signals, and another filter bank for producing Q signals;
• and
• an I/Q output configuration module for selectively combining I and Q signals output by said filter block and said second filter block into desired filter outputs.

A digital filter comprising:

• a narrowband data splitter capable of receiving narrowband data samples and separating said narrowband data samples into narrowband even samples and narrowband odd samples;
• a wideband data-select module capable of receiving wideband data samples and providing offset wideband data samples in response thereto;
• a controller capable of generating timing and control signals and coefficient-selection signals based on an operational mode of said digital filter, said operational mode including wideband mode and narrowband mode;
• filter blocks adapted to filter said narrowband even samples and said narrowband odd samples during narrowband mode and to filter said wideband data samples and said offset wideband data samples during said wideband mode in response to said timing and control signals from said controller;
• and
• a shared filter coefficient memory for selectively providing filter coefficients to said one or more filter blocks in response to said timing and control signals from said controller.

A method for filtering a signal including the steps of:

• receiving a first signal of a first type and a second signal of a second type, said first type of signal being characterized by a first rate and said second type of signal being characterized by a second rate, said first rate being a narrowband rate, and said second rate being a wideband rate;
• selectively filtering said first signal during a first mode of operation and filtering said second signal during a second mode of operation with a filter;
• wherein the filter comprises a first filter block and a second filter block, each having two filter banks, one filter bank for producing I signals, and another filter bank for producing Q signal;
• generating a control signal;
• automatically configuring said filter to operate in said first mode of operation or said second mode of operation in response to said control signal;
• selectively combining I and Q signal output by said first filter block and said second filter block into desired filter output using an I/Q output configuration module.

An efficient signal filter comprising:

• first means for receiving a first signal of a first type and a second signal of a second type, said first type of signal being characterized by a first rate and said second type of signal being characterized by a second rate, said first rate being a narrowband rate and said second rate being a wideband rate;
• second means including plural filter banks for selectively filtering said first signal during a first mode of operation and filtering said second signal during a second mode of operation, the plural filter banks including one or more Multiply-Accumulate (MAC) pipes, each of said one or more MAC pipes including one or more MAC blocks, each MAC block associated with one or more corresponding coefficient memory data structures;
• third means for generating control signals, said third means including a controller and said control signals include plural control signals that are input to one or more multiplexers or switches that control whether said MAC pipes are in a serial configuration or a parallel configuration corresponding to said first mode of operation or said second mode of operation, respectively,
• fourth means for automatically configuring said second means to operate in said first mode of operation or said second mode of operation based on said control signals;
• and
• fifth means for selecting coefficients from each of said one or more memory data structures to apply to each of said one or more MAC blocks, thereby selectively affecting filter signal response.

An efficient signal filter comprising:

• first means for receiving a first signal of a first type and a second signal of a second type, said first type of signal being characterized by a first rate and said second type of signal being characterized by a second rate, said first rate being a narrowband rate and said second rate being a wideband rate;
• second means including plural filter banks for selectively filtering aid first signal during a first mode of operation and filtering said second signal during a second mode of operation, the plural filter banks including one or more Multiply-Accumulate (MAC) pipes, each of said one or more MAC pipes including one or more MAC blocks, each MAC block associated with one or more corresponding coefficient memory data structures;
• third means for generating control signals, said third means including a controller;
• fourth means for automatically configuring said second means to operate in said first mode of operation or said second mode of operation based on said control signals;
• fifth means for selecting coefficients from each of said one or more memory data structures to apply to each of said one or more MAC blocks, thereby selectively affecting filter signal response;
• and
• sixth means for adjusting filter lengths or integration delays associated with said filter, wherein said sixth means includes said one or more multiplexers or switches, which are responsive to specific control signals from said controller, said specific control signals configured to selectively switch a desired number of said multiplexers or switches to affect numbers of said MAC pipes connected in a serial configuration, thereby affecting filter integration delay during said first mode of operation.

An efficient signal filter comprising:

• first means for receiving a first signal of a first type and a second signal of a second type, said first type of signal being characterized by a first rate and said second type of signal being characterized by a second rate, said first rate being a narrowband rate and said second rate being a wideband rate;
• second means including plural filter banks for selectively filtering said first signal during a first mode of operation and filtering said second signal during a second mode of operation;
• wherein the second means comprises a first filter block and a second filter block, each having two filter banks, one filter bank for producing I signals, and another filter bank for producing Q signals;
• third means for generating control signals, said third means including a controller;
• fourth means for automatically configuring said second means to operate in said first mode of operation or said second mode of operation based on said control signals;
• and
• an I/Q output configuration module for selectively combining I and Q signals output by said first filter block and said second filter block into desired filter outputs.