Digital signal processing device working with continuous bit streams
AssigneeGeophysical Company of Norway A.S.
InventorOtto Benestad
Life of this patent
Estimating the term…
Abstract
A device which can be used for digital signal processing, e.g. filtering of digital signals in the form of continuous bit streams that are linear digital representations of analogue signals. The device is composed by cascading individual filter sections. Each filter section comprises an integrating and multiplying unit, or units, an inverting unit or units and an adding unit or units. The device has been implemented on a monolithic integrated programmable circuit together with soft controlled solid state switches such that a preferred filter configuration may be selected by programming the circuit.
Claims9
A device for digitally filtering continuous bit streams that are linear digital representations of analog signals, said device comprising a plurality of individual filter sections connected in cascade, each said individual filter section having a bit stream input fed from a respective previous filter section and a bit stream output feeding a respective next filter section, said respective bit stream inputs and outputs being at the same data rate, each said filter section including:
- at least one integrating and multiplying unit for outputting a bit stream equal to an integral of an input bit stream input thereto multiplied by a selectable constant;
- at least one inverting unit for outputting a bit stream equal to an input bit stream input thereto multiplied by -1;
- and
- at least one adding unit for outputting a bit stream euqal to the sum of two respective input bit streams input to respective inputs thereof;
- output signals from said integrating and multiplying, inverting and adding units all being bit streams with the same bit rate as said input bit streams input thereto, said integrating and multiplying, inverting and adding units being connected together as a first-order filter section wherein an input bit stream is applied to a first input of said adding unit, an output bit stream from said adding units is applied to an input of said integraing and multiplying unit, and an output bit stream of said integrating and multiplying unit is fed via said inverting unit to a second input of said adding unit.
A device for digitally filtering continuous bit streams that are linear digital representations of analog signals, said device comprising a plurality of individual filter sections connected in cascade, each said individual filter section having a bit stream input fed from a respective previous filter section and a bit stream output feeding a respetive next filter section, said respective bit stream inputs and outputs being at the same data rate, each said filter section including:
- at least two integrating and multiplying units for each outputting a bit stream equal to an integral of an input stream input thereto multiplied by a selectable constant;
- at least two inveting units for each outputting a bit stream equal to an input bit stream input thereto multiplied by -1;
- and
- at least two adding units for each outputting a bit stream equal to the sum of two respective input bit streams input to respective inputs thereof;
- output signals from said integrating and multiplying, inverting and adding units all being bit streams with the same bit rate as said input bit streams input thereto, said integrating and multiplying, inverting and adding units being connected together as a second-order filter section wherein an input bit stream is applied to a first input of a first adding unit, an output bit stream from said first adding unit is applied to a first input of a second adding unit, an output bit stream from said second adding unit is applied to an input of a first integrating and multiplying unit, an output bit stream from said first integrating and multiplying unit is applied to an input of a second integrating and multiplying unit and also via a first inverting unit to a second input of said second adding unit, and an output bit stream of said second integrating and multiplying unit is applied via a second inverting unit to a second input of said first adding unit.
Dependencies are inferred from the claim text.