All The Claims

1. A system for controlling the injection of wastewater treatment chemicals into a wastewater stream, comprising:
a holding tank for collecting and holding wastewater being treated;
a camera positioned for making images of the wastewater in the holding tank;
means for automatically making the images of the wastewater in the holding tank at scheduled intervals;
means for analyzing the images in order to determine the necessity for injecting wastewater treatment chemicals into the wastewater stream, comprising measuring the size, distribution and number of pixels of differing colors and appearances, such that pixels of differing colors and appearances represent differing moieties in the wastewater stream including unreacted waste products and unreacted wastewater treatment chemicals; and
means for injecting wastewater treatment chemicals into the wastewater stream responsive to the analysis of the images indicating the necessity of such injection.
2. The system set forth in claim 1 wherein the camera comprises a digital camera.
3. The system set forth in claim 1 wherein the images comprise still photographs.
4. The system set forth in claim 1 wherein the images comprise video images.
5. The system set forth in claim 1 wherein the camera is positioned above the holding tank and is focused on the wastewater in the holding tank therebelow.
6. The system set forth in claim 1 wherein the camera is contained within a waterproof housing and is submerged in the wastewater in the holding tank.
7. The system set forth in claim 2 wherein the means for analyzing the images in order to determine the necessity for injecting wastewater treatment chemicals into the wastewater stream comprises a computer and wherein the means for injecting wastewater treatment chemicals into the wastewater stream is controlled by the computer, thereby limiting the need for operator involvement.
8. The system set forth in claim 1 wherein the means for injecting wastewater treatment chemicals into the wastewater stream injects the chemicals upstream and prior to flow into the holding tank.
9. The system set forth in claim 1 wherein the means for injecting wastewater treatment chemicals into the wastewater stream injects the chemicals downstream and after flow from the holding tank.
10. The system set forth in claim 1 wherein the means for injecting wastewater treatment chemicals into the wastewater stream injects the chemicals into the holding tank.
11. The system set forth in claim 7 wherein the computer determines the particle sizes of differing moieties in the wastewater stream by the grouping of pixels of similar color and appearance.
12. The system set forth in claim 7 wherein the computer determines the concentrations of differing moieties in the wastewater stream by the spacing between the various pixels.
13. The system set forth in claim 1 for use in batch treatment processes.
14. The system set forth in claim 1 for use in flow-through treatment processes.
15. The system set forth in claim 1 wherein the wastewater treatment chemicals are selected from the group consisting of precipitants, coagulants, flocculants, anti-foam or wetting agents, and weighting agents.
16. A system for controlling the injection of wastewater treatment chemicals into a wastewater stream, comprising:
a holding tank for collecting and holding wastewater being treated;
a spectrophotometer positioned for analyzing of the wastewater in the holding tank; and
means for injecting wastewater treatment chemicals into the wastewater stream responsive to the analysis of spectrophotometer indicating the necessity of such injection.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

We claim:

1. A method of supplying interchangeable modules of a cockpit system for a first vehicle having a left-hand-drive arrangement and for a second vehicle having a right-hand drive arrangement, comprising:
providing a set of driver-side modules, each fastenable to a left side of the first vehicle and fastenable to a right side of the second vehicle;
providing a set of passenger-side modules, each fastenable to the right side of the first vehicle and fastenable to the left side of the second vehicle;
providing a set of center modules, each fastenable between one of the driver-side modules and one of the passenger-side modules;
providing a set of left-hand-drive top modules, each fastenable to the first vehicle over one of the driver-side modules, one of the center modules, and one of the passenger side modules;
providing a set of right-hand-drive top modules, each fastenable to the second vehicle over one of the driver-side modules, one of the center modules, and one of the passenger side modules;
supplying one of the driver-side modules, one of the center modules, one of the passenger-side modules, and one of the left-hand-drive top modules for the first vehicle; and
supplying one of the driver-side modules, one of the center modules, one of the passenger-side modules, and one of the right-hand-drive top modules for the second vehicle.
2. The method of claim 1 wherein each of the driver-side modules includes a steering control.
3. The method of claim 2 wherein each of the passenger-side modules includes a storage compartment.
4. The method of claim 3 wherein each of the center modules includes an audio control.
5. The method of claim 3 wherein each of the center modules includes a climate control.
6. The method of claim 5 wherein each of the first top modules and the second top modules includes a HVAC duct.
7. The method of claim 1 further comprising:
providing a set of left covers, each fastenable to the left side of the first vehicle and of the second vehicle;
providing a set of right covers, each fastenable to the right side of the first vehicle and of the second vehicle;
supplying one of the left covers and one of the right covers for the first vehicle; and
supplying one of the left covers and one of the right covers for the second vehicle.
8. The method of claim 7 wherein each of the left covers are fastenable to one of the driver-side modules and to one of the passenger-side modules, and each of the right covers are fastenable to one of the driver-side modules and to one of the passenger-side modules.
9. A method of supplying interchangeable modules of a cockpit system for a first vehicle having a narrow cockpit width and for a second vehicle having a wide cockpit width, comprising:
providing a set of driver-side modules, each fastenable to the first vehicle and to the second vehicle;
providing a set of passenger-side modules, each fastenable to the first vehicle and to the second vehicle;
providing a set of narrow center modules, each fastenable between one of the driver-side modules and one of the passenger-side modules;
providing a set of wide center modules, each fastenable between one of the driver-side modules and one of the passenger-side modules;
providing a set of narrow top modules, each fastenable to the first vehicle over one of the driver-side modules, one of the center modules, and one of the passenger-side modules;
providing a set of wide top modules, each fastenable to the second vehicle over one of the driver-side modules, one of the center modules, and one of the passenger-side modules;
supplying one of the driver-side modules, one of the narrow center modules, one of the passenger-side modules, and one of the narrow top modules for the first vehicle; and
supplying one of the driver-side modules, one of the wide center modules, one of the passenger-side modules, and one of the wide top modules for the second vehicle.
10. The method of claim 9 wherein each of the driver-side modules includes a steering control.
11. The method of claim 10 wherein each of the passenger-side modules includes a storage compartment.
12. The method of claim 11 wherein each of the narrow center modules and wide center modules includes an audio control.
13. The method of claim 11 wherein each of the narrow center modules and wide center modules includes a climate control.
14. The method of claim 13 wherein each of the first top modules and the second top modules includes a HVAC duct.
15. The method of claim 9 further comprising:
providing a set of left covers, each fastenable to a left side of the first vehicle and of the second vehicle;
providing a set of right covers, each fastenable to a right side of the first vehicle and of the second vehicle;
supplying one of the left covers and one of the right covers for the first vehicle; and
supplying one of the left covers and one of the right covers for the second vehicle.
16. A cockpit system of interchangeable modules for a first vehicle having a left-hand-drive arrangement and for a second vehicle having a right-hand-drive arrangement, comprising:
a driver-side module;
a passenger-side module;
a center module fastenable between said driver-side module and said passenger-side module;
a left-hand-drive top module;
a right-hand-drive top module;
wherein said driver-side module is fastenable to a left side of the first vehicle, said passenger-side module is fastenable to a right side of the first vehicle, and said left-hand-drive top module is fastenable to the first vehicle over said driver-side module, said center module, and said passenger-side module; and
wherein said driver-side module is fastenable to the right side of the second vehicle, said passenger-side module is fastenable to the left side of the second vehicle, and said right-hand-drive top module is fastenable to the second vehicle over said driver-side module, said center module, and said passenger-side module.
17. The cockpit system of claim 16 wherein said driver-side module includes a steering control.
18. The cockpit system of claim 17 wherein said passenger-side module includes a storage compartment.
19. The cockpit system of claim 18 wherein said center module includes an audio control.
20. The cockpit system of claim 18 wherein said center module includes a climate control.
21. The cockpit system of claim 20 wherein said first top module and said second top module includes a HVAC duct.
22. The cockpit system of claim 16 further comprising:
a left cover fastenable to the left side of the first vehicle and of the second vehicle; and
a right cover fastenable to the right side of the first vehicle and of the second vehicle.
23. A cockpit system of interchangeable modules for a first vehicle having a narrow cockpit width and for a second vehicle having a wide cockpit width, comprising:
a driver-side module;
a passenger-side module;
a narrow center module;
a wide center module;
a narrow top module;
a wide top module;
wherein said driver-side module is fastenable to the first vehicle, said passenger-side module is fastenable to the first vehicle, said narrow center module is fastenable between said driver-side module and said passenger-side module, and said narrow top module is fastenable to the first vehicle over said driver-side module, said narrow center module, and said passenger-side module; and
wherein said driver-side module is fastenable to the second vehicle, said passenger-side module is fastenable to the second vehicle, said wide center module is fastenable between said driver-side module and said passenger-side module, and said wide top module is fastenable to the second vehicle over said driver-side module, said wide center module, and said passenger-side module.
24. The cockpit system of claim 23 wherein said driver-side module includes a steering control.
25. The cockpit system of claim 24 wherein said passenger-side module includes a storage compartment.
26. The cockpit system of claim 25 wherein said narrow center module and said wide center module includes an audio control.
27. The cockpit system of claim 25 wherein said narrow center module and said wide center module includes a climate control.
28. The cockpit system of claim 27 wherein said narrow top module and said wide top module includes a HVAC duct.
29. The cockpit system of claim 23 further comprising:
a left cover fastenable to a left side of the first vehicle and of the second vehicle; and
a right cover fastenable to a right side of the first vehicle and of the second vehicle.

1. A process for making a membrane having curved features, comprising:
vacuum bonding a first surface of a first substrate to a first surface of a first membrane layer, the first surface of the first substrate having a plurality of cavities formed therein, the first membrane layer being an exposed layer of a second substrate, a second surface of the first membrane layer being attached to a handle layer of the second substrate, and the first surface of the first membrane layer seals the plurality of cavities to form a plurality of vacuum chambers at completion of the vacuum bonding;
removing the handle layer of the second substrate to expose the second surface of the first membrane layer;
exposing the second surface of the first membrane layer to a fluid pressure such that the first membrane layer bends in areas above the plurality of cavities and touches respective bottom surfaces of the plurality of cavities at a plurality of respective contact locations; and
annealing the first membrane layer and the first substrate to form permanent bonds between the first membrane layer and the first substrate at the plurality of respective contact locations.
2. The process of claim 1, further comprising:
depositing a second membrane layer over the second surface of the first membrane layer, such that the second membrane layer conforms to the second surface of the first membrane layer and includes a plurality of curved portions in the areas above the plurality of cavities.
3. The process of claim 2, wherein:
the second membrane layer includes multiple sub-layers, and
depositing the second membrane layer comprises sequentially depositing each of the multiple sub-layers over the second surface of the first membrane layer.
4. The process of claim 3, wherein the sub-layers include at least a reference electrode layer, a sputtered piezoelectric layer, and a drive electrode layer.
5. The process of claim 2, wherein the depositing is performed after the annealing.
6. The process of claim 2, further comprising:
after the second membrane layer is deposited, removing the bottom surfaces of the plurality of cavities to open the plurality of vacuum chambers and expose the first surface of the first membrane layer in areas within respective sidewalls of the plurality of cavities.
7. The process of claim 6, wherein removing the bottom surfaces of the plurality of cavities further comprises:
etching a second surface of the first substrate in at least the areas within the respective sidewalls of the plurality of cavities such that the plurality of vacuum chambers are opened and that the first surface of the first membrane layer are exposed in the areas within the respective sidewalls of the plurality of cavities, where exposed first surface of the first membrane layer serves as an etch stop for the etching.
8. The process of claim 6, further comprising:
removing the first membrane layer in the areas within the sidewalls of the plurality of cavities to expose the curved portions of the second membrane layer, while the curved portions of the second membrane layer remain curved during and after the removal of the first membrane layer.
9. The process of claim 8, wherein removing the first membrane layer in the areas within the respective sidewalls of the plurality of cavities further comprises:
etching the first membrane layer in the areas within the respective sidewalls of the plurality of cavities to expose the curved portions of the second membrane layer, where the exposed curved portions of the second membrane layer serves as an etch stop and the first substrate serves as a mask for the etching.
10. The process of claim 1, further comprising:
selectively etching the first surface of the first substrate through a patterned photoresist layer to form the plurality of cavities, the patterned photoresist layer defining respective lateral dimensions and locations of the plurality of cavities; and
removing the patterned photoresist layer from the first surface of the first substrate after the plurality of cavities reach a predetermined depth.
11. The process of claim 10, wherein the selective etching is dry etching.
12. The process of claim 10, wherein the respective bottom surfaces of the plurality of cavities are sufficiently smooth to enable bonding with another substrate.
13. The process of claim 1, wherein vacuum bonding the first surface of the first substrate to the first surface of the first membrane layer further comprises:
forming a oxide or nitride layer on a silicon substrate; and
bonding an exposed surface of the oxide or nitride layer to the first surface of the first substrate in a vacuum environment.
14. The process of claim 1, further comprising:
forming the plurality of cavities in the first surface of the first substrate.
15. The process of claim 1, wherein exposing the second surface of the first membrane layer to a fluid pressure comprises:
exposing the second surface of the first membrane layer to an atmosphere pressure.
16. The process of claim 1, wherein the plurality of cavities have a depth of 5-15 microns.
17. The process of claim 1, wherein the plurality of cavities have respective lateral dimensions of 150-200 microns.
18. The process of claim 1, wherein the first membrane layer has a thickness of 1-2 microns.
19. A process for making a membrane having a curved feature, comprising:
vacuum bonding a first surface of a first substrate to a first surface of a first membrane layer, the first surface of the first substrate having a cavity formed therein, the first membrane layer being an exposed layer of a second substrate, a second surface of the first membrane layer being attached to a handle layer of the second substrate, and the first surface of the first membrane layer seals the cavity to form a vacuum chamber at completion of the vacuum bonding;
removing the handle layer of the second substrate to expose the second surface of the first membrane layer;
exposing the second surface of the first membrane layer to a fluid pressure such that the first membrane layer bends in an area above the cavity and touches a bottom surface of the cavity at a contact location;
annealing the first membrane layer and the first substrate to form a permanent bond between the first membrane layer and the first substrate at the contact location;
depositing a second membrane layer over the second surface of the first membrane layer, such that the second membrane layer conforms to the second surface of the first membrane layer and includes a curved portion in the area above the cavity; and
after the second membrane layer is deposited, removing the bottom surface of the cavity to open the vacuum chamber and expose the first surface of the first membrane layer in an area within sidewalls of the cavity.
20. A process for making a membrane having a curved feature, comprising:
vacuum bonding a first surface of a first substrate to a first surface of a first membrane layer, the first surface of the first substrate including a cavity formed therein; the first membrane layer being an exposed layer of a second substrate, a second surface of the first membrane layer being attached to a handle layer of the second substrate, and the first surface of the first membrane layer seals the cavity to form a vacuum chamber at completion of the vacuum bonding;
removing the handle layer of the second substrate to expose the second surface of the first membrane layer;
exposing the second surface of the first membrane layer to a fluid pressure such that the first membrane layer bends in an area above the cavity;
depositing a second membrane layer over the second surface of the first membrane layer while the second surface of the first membrane layer is exposed to the fluid pressure, such that the second membrane layer conforms to the second surface of the first membrane layer and includes a curved portion in the area above the cavity; and
after the second membrane layer is deposited, removing the bottom surface of the cavity to open the vacuum chamber and expose the first surface of the first membrane layer in an area within sidewalls of the cavity.
21. The process of claim 20, wherein removing the bottom surface of the cavity further comprises:
etching a second surface of the first substrate in at least the area within the sidewalls of the cavity such that the vacuum chamber is opened and that the first surface of the first membrane layer is exposed in the area within the sidewalls of the cavity, where exposed first surface of the first membrane layer serves as an etch stop for the etching.
22. The process of claim 20, further comprising:
removing the first membrane layer in the area within the sidewalls of the cavity to expose the curved portion of the second membrane layer, while the curved portion of the second membrane layer remains curved during and after the removal of the first membrane layer.
23. The process of claim 22, wherein removing the first membrane layer in the area within the sidewalls of the plurality of cavities further comprises:
etching the first membrane layer in the area within the sidewalls of the cavity to expose the curved portion of the second membrane layer, where the exposed curved portion of the second membrane layer serves as an etch stop and the first substrate serves as a mask for the etching.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

1. A distributed acquisition apparatus, comprising:
a sampler component configured to receive a signal under test;
a plurality of analog-to-digital converters (ADCs) operationally coupled to the sampler component and configured to produce digitized samples of the signal under test;
a time-interleaved acquisition processing network including a plurality of interconnected distributed acquisition components, each distributed acquisition component including:
an acquisition memory configured to store a portion of the digitized samples; and
a first summer configured to de-interleave the digitized samples between the distributed acquisition components; and

a last distributed acquisition component associated with the interleaved processing network of distributed acquisition components, the last distributed acquisition component including an acquisition memory to store a portion of the digitized samples and a second summer configured to de-interleave the digitized samples, wherein the last distributed acquisition component is configured to receive the de-interleaved digitized samples from the plurality of distributed acquisition components and output a recombined coherent waveform.
2. The distributed acquisition apparatus of claim 1, further comprising:
a digital down-converter (DDC) section associated with the last distributed acquisition component, wherein the DDC section includes:
a mixer component configured to receive and multiply the recombined coherent waveform with a complex sinusoidal waveform, and to produce a mixed signal having mathematical real and imaginary parts;
a decimating filter coupled to the mixer component and configured to receive and filter the mixed signal; and
a down-sampler coupled to the decimating filter and configured to down-sample the mixed signal,

wherein the DDC section is configured to produce coherent down-converted complex in-phase and quadrature (IQ) data.
3. The distributed acquisition apparatus of claim 2, wherein the digital down-converter section includes a plurality of down-samplers and a plurality of decimating filters, wherein the plurality of down-samplers are interspersed between the plurality of decimating filters.
4. The distributed acquisition apparatus of claim 2, wherein the DDC section is configured to receive the recombined coherent waveform from the second summer of the last distributed acquisition component.
5. The distributed acquisition apparatus of claim 1, wherein the acquisition memory of the distributed acquisition components is configured to store real data samples.
6. The distributed acquisition apparatus of claim 1, wherein each of the distributed acquisition components includes an up-sampler coupled to the acquisition memory, and configured to up-sample the digitized samples by a factor M, wherein M is the total number of distributed acquisition components including the last acquisition component.
7. The distributed acquisition apparatus of claim 1, wherein each of the distributed acquisition components includes:
a digital down-converter (DDC) section, wherein each DDC section includes:
a mixer component configured to receive and multiply the corresponding portion of the digitized samples with a complex sinusoidal waveform, and to produce a mixed signal having mathematical real and imaginary parts;
a decimating filter coupled to the mixer component and configured to receive and filter the mixed signal; and
a down-sampler coupled to the decimating filter and configured to down-sample the mixed signal,

wherein each DDC section is configured to produce down-converted complex in-phase and quadrature (IQ) data.
8. The distributed acquisition apparatus of claim 7, wherein the digital down-converter section includes a plurality of down-samplers and a plurality of decimating filters, wherein the plurality of down-samplers are interspersed between the plurality of decimating filters.
9. The distributed acquisition apparatus of claim 7, wherein:
the first summer of each of the distributed acquisition components is coupled to an output of each corresponding DDC section, wherein the first summer is configured to de-interleave the down-converted data received from the DDC sections.
10. The distributed acquisition apparatus of claim 1, wherein each of the distributed acquisition components includes:
a mixer component coupled to an input of the corresponding acquisition memory, and configured to receive and multiply the corresponding portion of the digitized samples with a complex sinusoidal waveform, and to produce a mixed signal having mathematical real and imaginary parts;
a polyphase interpolation filter coupled to an output of the acquisition memory and configured to receive and filter the mixed signal; and
a down-sampler coupled to the corresponding polyphase interpolation filter and configured to down-sample the filtered signal.
11. The distributed acquisition apparatus of claim 10, wherein the polyphase interpolation filter includes a filter having the following frequency responses expressed as a z-transform:
H
m

\u2061

(
z
)
=
z

m
M
\xb7

H
\u2061

(

z
M

)
,
\u2062

m
\u2208
0
\u2062

:

\u2062
M

–
1
where H(z) is the desired digital down-conversion filter response for a given bandwidth span and target sample rate, m is the relative polyphase phase selected from 0 to M\u22121 for a given parallel branch of the polyphase filter, and M is the total number of distributed acquisition components in the interleaved processing network of distributed acquisition components including the last acquisition component.
12. The distributed acquisition apparatus of claim 11, further comprising a delay stage to compensate for the relative sampling phase offsets between distributed acquisition components.
13. The distributed acquisition apparatus of claim 11, wherein the filter has the overall frequency response expressed as the z-transform for cases where L is greater than or equal to M, where L is the down-sample factor for a given bandwidth span and associated sample rate.
14. The distributed acquisition apparatus of claim 1, wherein each of the distributed acquisition components includes:
an acquisition DDC section coupled to an input of the acquisition memory, wherein each acquisition DDC section includes:
a mixer component configured to receive and multiply the corresponding portion of the digitized samples with a complex sinusoidal waveform, and to produce a mixed signal having mathematical real and imaginary parts;
a decimating filter coupled to the mixer component and configured to receive and filter the mixed signal; and
a down-sampler coupled to the decimating filter and configured to down-sample the mixed signal by a factor of LM, wherein M is the total number of distributed acquisition components in the interleaved processing network of distributed acquisition components including the last acquisition component, and L is the down-sample factor for a given bandwidth span and associated sample rate; and

a complex finite impulse response (FIR) filter section coupled to an output of the corresponding acquisition memory, wherein each complex FIR filter section includes a fractional time-shift filter.
15. The distributed acquisition apparatus of claim 14, wherein the digital down-converter section includes a plurality of down-samplers and a plurality of decimating filters, wherein the plurality of down-samplers are interspersed between the plurality of decimating filters.
16. The distributed acquisition apparatus of claim 14, further comprising a second complex FIR filter coupled to the second summer of the last distributed acquisition component, wherein the second complex FIR filter is configured to produce filtered complex IQ data samples.
17. The distributed acquisition apparatus of claim 14, wherein the complex FIR filter section comprises a single complex FIR filter that combines a fractional time-shift and an arbitrary complex FIR filter in each section.
18. The distributed acquisition apparatus of claim 14, wherein each of the distributed acquisition components further includes a spin DDC section coupled to an output of the corresponding acquisition memory and to an input of the corresponding complex FIR filter section, wherein the acquisition DDC section is configured to operate in real-time prior to storing acquisition data to the corresponding acquisition memory, and wherein the spin DDC section is configured to process information received from the acquisition memory.
19. The distributed acquisition apparatus of claim 1, further comprising:
a spin DDC section coupled to the second summer of the last distributed acquisition component; and
a frequency transform section coupled to the spin DDC section, wherein the frequency transform section is configured to produce complex spectral samples in the frequency domain.
20. The distributed acquisition apparatus of claim 1, further comprising:
an acquisition buffer coupled to the second summer of the last distributed acquisition component; and
a frequency transform section coupled to the acquisition buffer, wherein the frequency transform is configured to produce complex spectral samples in the frequency domain.
21. The distributed acquisition apparatus of claim 1, wherein each of the distributed acquisition components includes:
an acquisition DDC section coupled to an input of the acquisition memory, wherein the acquisition DDC section includes:
a mixer component configured to receive and multiply the corresponding portion of the digitized samples with a complex sinusoidal waveform, and to produce a mixed signal having mathematical real and imaginary parts;
a decimating filter coupled to the mixer component and configured to receive and filter the mixed signal;
a down-converter coupled to the one or more decimating filters and configured to down-sample the mixed signal by a factor of LM, wherein M is the total number of distributed acquisition components in the interleaved processing network of distributed acquisition components including the last acquisition component, and L is the down-sample factor for a given bandwidth span and associated sample rate; and

a frequency transform section coupled to an output of the corresponding acquisition memory, wherein each frequency transform section is configured to produce complex spectral samples in the frequency domain.
22. The distributed acquisition apparatus of claim 21, wherein the digital down-converter section includes a plurality of down-samplers and a plurality of decimating filters, wherein the plurality of down-samplers are interspersed between the plurality of decimating filters.
23. The distributed acquisition apparatus of claim 21, wherein:
the first summer of each of the distributed acquisition components is coupled to an output of each corresponding frequency transform section, wherein the first summer is configured to de-interleave the complex spectral samples received from the frequency transform sections.
24. The distributed acquisition apparatus of claim 21, further comprising:
a spin DDC section coupled to an output of the acquisition memory and to an input of the frequency transform section.
25. The distributed acquisition apparatus of claim 1, further comprising:
a spin DDC section coupled to the second summer of the last distributed acquisition component; and
a complex FIR filter section coupled to the spin DDC section, wherein the complex FIR filter section includes a complex finite impulse response (FIR) filter to produce filtered complex IQ data samples.