All The Claims

1. A Liquid Crystal Display (LCD) assembly comprising:
an LCD;
a support member pivotably engaging with the LCD so that the LCD is rotatable relative to the support member about a first axis;
a sliding member pivotably engaging with the support member so as to be rotatable relative to the support member about a second axis that is perpendicular to the first axis; and
a bracket receiving the sliding member, wherein the sliding member is slidable in the bracket.
2. The LCD assembly of claim 1, wherein first and second hooks are located on the LCD; first and second blocking tabs extend from the support member; and the LCD is rotatable between a first position in which the first hook engages the first blocking tab and a second position in which the second hook engages the second blocking tab.
3. The LCD assembly of claim 1, wherein a connecting member pivotably connects the support member with the sliding member so that the support member is rotatable relative to the sliding member about the second axis.
4. The LCD assembly of claim 3, wherein the sliding member defines a locking hole for receiving the connecting member; the connecting member defines a securing slot therein; the securing slot is positioned in the sliding member when secured to the support member; and a securing member is secured in the securing slot to prevent the connecting member from dislodging from the locking hole of the support member.
5. The LCD assembly of claim 3, wherein the support member defines a cutout therein; a post is formed on the sliding member; and the supporting member is rotatable to engage the post.
6. The LCD assembly of claim 3, wherein the support member defines a locating hole for receiving the connecting member; the connecting member defines a first securing slot therein; the first securing slot is positioned in the support member when the connecting member is secured to the support member; a first securing member is secured in the first securing slot to prevent the connecting member from dislodging from the locating hole of the support member.
7. The LCD assembly of claim 3, wherein a first spring is disposed about the connecting member between the support member and the sliding member.
8. The LCD assembly of claim 1, wherein the bracket defines a sliding slot therein, and the sliding member forms a sliding tab that is slidable in the sliding slot.
9. The LCD assembly of claim 1, wherein a gear member is secured on the sliding member; and a rack located on the bracket meshes with the gear member.
10. The LCD assembly of claim 1, wherein a second spring is disposed between the bracket and the sliding member, and the sliding member is slidable relative to the bracket to resiliently deform the second spring.
11. An LCD assembly comprising:
an LCD;
a support member pivotally engaging with the LCD so that the LCD is rotatable relative to the LCD about a first axis;
a sliding member pivotably engaging with the support member so as to be rotatable relative to the support member about a second axis different from the first axis, a gear member being located on the sliding member; and
a bracket slidably engaging with the sliding member, a rack being located in the bracket to mesh with the gear member.
12. The LCD assembly of claim 11, wherein first and second hooks are formed on the LCD; first and second blocking tabs are formed on the support member; the LCD is rotatable between a first position, in which the first hook engages the first blocking tab, and a second position, in which the second hook engages the second blocking tab.
13. The LCD assembly of claim 11, wherein a connecting member pivotably connects the support member with the sliding member so that the support member is rotatable relative to the sliding member about the second axis.
14. The LCD assembly of claim 13, wherein the sliding member defines a locking hole for receiving the connecting member; the connecting member defines a first securing slot therein; the first securing slot is positioned in the sliding member when the connecting member is secured to the support member; a first securing member is secured in the first securing slot to prevent the connecting member from dislodging from the locking hole of the support member.
15. The LCD assembly of claim 13, wherein the support member defines a cutout therein; a post is formed on the sliding member; and the supporting member is rotatable to engage the post in the cutout of the sliding member.
16. The LCD assembly of claim 13, wherein the support member defines a locating hole for receiving the connecting member; the connecting member defines a second securing slot therein; the second securing slot is positioned in the support member when the connecting member is secured to the support member; a second securing member is secured in the second securing slot to prevent the connecting member from dislodging from the locating hole of the support member.
17. The LCD assembly of claim 13, wherein a first spring is disposed about the connecting member between the support member and the sliding member.
18. The LCD assembly of claim 11, wherein the bracket defines a sliding slot therein; the sliding member forms a sliding tab that is slidable in the sliding slot.
19. The LCD assembly of claim 11, wherein a second spring is disposed between the bracket and the sliding member, and the sliding member is slidable relative to the bracket to resiliently deform the second spring.

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. Steering mechanism for directing a plurality of steered wheels of a vehicle with respect to a chassis, wherein each steered wheel is adapted to pivot with respect to said chassis, the steering mechanism comprising, for each steered wheel:
a first vertical axis about which the steered wheel pivots;
a first link comprising a first end and a second end, wherein the first end is in co-operation with the steered wheel providing for a torque to be applied to the steered wheel to make the steered wheel pivot around said first vertical axis;
a first linear displacement axis defined by a rail, wherein the rail is pivotally connected to a cross-piece of said chassis to pivot about a second vertical axis, wherein said second end of said first link is mounted in a sliding fashion along the rail so that the second end of the first link can move relative to the rail, thereby allowing translational movement of the second end of said first link relative to said chassis.
2. The steering mechanism of claim 1, wherein rails are parallel to the longitudinal direction of the vehicle when the plurality of steered wheels are straight.
3. The steering mechanism of claim 1, wherein the plurality of steered wheels include two steered wheels of a common axle and wherein both rails corresponding to the two steered wheels pivot about the same second vertical axis.
4. The steering mechanism of claim 1, further comprising a respective second link for at least one of the steered wheels for forcing the second end of the respective first link to move along the respective first linear displacement axis when the respective rail is pivoted, so as to reduce the amplitude of the pivoting of the at least one steered wheel when said wheel is an outside wheel in a turn.
5. The steering mechanism of claim 1, further comprising a second link for each steered wheel for forcing the second end of the respective first link to occupy a predefined position along the respective first linear displacement axis, said position being variable during turns.
6. The steering mechanism of claim 1, wherein for each steered wheel there is also provided:
a second link,
a third vertical axis, about which said second link can pivot with respect to said first link, and
a fourth vertical axis arranged, about which said second link can pivot with respect to the chassis.
7. The steering mechanism of claim 1, wherein said rails pivot in turns in the same direction as said steered wheels, the rotation angle of the rails being different from the rotation angle of the associated wheels.
8. The steering mechanism of claim 1, wherein the plurality of steered wheels comprise four steered wheels, each steered wheel being in co-operation with the respective first link and wherein said second end of said first link is mounted in a sliding fashion along the respective rail connected to said chassis.
9. The steering mechanism of claim 8, wherein the four steered wheels include two front wheels and two rear wheels, and wherein the steering mechanism further comprises a transmission rod arranged to transmit rotation between the front wheels and the rear wheels.
10. The steering mechanism of claim 9, wherein said transmission rod comprises a longitudinal bar of which one end is adapted to be attached to the rails of the two front wheels whilst the other end is adapted to be attached to the rails of the two rear wheels.
11. The steering mechanism of claim 9, said transmission rod being provided with a double bend, a central part of said transmission rod being arranged so as to move longitudinally when the orientation of the wheels changes.
12. The steering mechanism of claim 1, further comprising a suspension in operative association with each steered wheel, each of said suspensions comprising a lower part in contact with the respective steered wheel, wherein each respective first link is connected to the lower part of each of said suspensions in contact with the steered wheels.
13. The steering mechanism of claim 12, wherein the rail consists of a cylindrical shaft allowing said first link to rotate around the longitudinal axis of said shaft during movements of said suspension.
14. The steering mechanism of claim 1, including a linear actuator to pivot the steered wheels with respect to said chassis.
15. The steering mechanism of claim 14, the linear actuator comprising one extremity of the actuator which is associated with said chassis and another extremity which is associated with a longitudinal rod associated with at least one of the rails.
16. The steering mechanism of claim 1, including an electric motor for each steered wheel, wherein each of said motors is configured to pivot with the associated steered wheel during the turns.
17. The steering mechanism of claim 16, further comprising electronic means for controlling the rotation speed of the electric motors so as to make outside wheels of the steered wheels turn faster than inside wheels of the steered wheels during turns.
18. A wheelchair, notably for the disabled, comprising a steering mechanism according to claim 1.
19. The wheelchair of claim 18, further comprising a seat and electric batteries for electrically driving the steered wheels, said batteries being placed under the seat, on both sides of a transmission rod between a front pair of the steered wheels and a rear pair of the steered wheels.

1. A method of acoustic echo cancellation (AEC) and noise cancellation (NC) wherein a microphone signal resulting from an unobservable signal corrupted by both additive background noise and an acoustic echo is processed in an attempt to restore the unobservable signal, the acoustic echo being a speaker signal modified by an acoustic path, wherein an adaptive filter models the echo path in the frequency domain, and wherein a noise cancellation filter is implemented in the frequency domain, the method comprising:
receiving the microphone signal;
applying the adaptive filter to the speaker signal to produce an echo signal that models the acoustic echo;
applying the noise cancellation filter to the microphone signal to produce an NC-filtered microphone signal;
applying a copy of the noise cancellation filter to the echo signal to produce an NC-filtered echo signal;
subtracting the NC-filtered echo signal from the NC-filtered microphone signal to produce a first echoless signal that resembles the unobservable signal; and
adapting the adaptive filter based on the first echoless signal.
2. The method of claim 1 wherein processing takes place independently in a plurality of subbands.
3. The method of claim 1 wherein the adaptive filter utilizes a data reuse normalized least mean square adaptive filter algorithm.
4. The method of claim 1 further comprising:
subtracting the echo signal from the microphone signal to produce a second echoless signal; and
applying a second noise cancellation filter to the second echoless signal to produce an output signal that resembles the unobservable signal.

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. An exhaust system for a tiltrotor aircraft, the exhaust system comprising:
a fixed exhaust in gaseous communication with an engine;
a primary exhaust duct in gaseous communication with the fixed exhaust, the primary exhaust being rotatable relative to the fixed exhaust about a nozzle rotational axis; and
a nacelle configured as a housing for the engine, the nacelle being rotatable relative to a wing of the tiltrotor aircraft about a nacelle rotational axis;
wherein the nozzle rotational axis and the nacelle rotational axis are approximately parallel.
2. The exhaust system according to claim 1, further comprising:
wherein the nacelle is rotatably between an approximately vertical orientation configurable for a helicopter mode operation of the tiltrotor aircraft and an approximately horizontal orientation configurable for an airplane mode operation of the tiltrotor aircraft.
3. The exhaust system according to claim 2, wherein the primary exhaust duct is configured to selectively direct an exhaust flow in an aft direction while the nacelle is vertically oriented.
4. The exhaust system according to claim 2, wherein the primary exhaust duct is configured to selectively direct an exhaust flow in an upwardoutboard direction while the nacelle is vertically oriented.
5. The exhaust system according to claim 2, wherein the primary exhaust duct is configured to selectively direct an exhaust flow in an upwardoutboard direction while the nacelle is horizontally oriented.
6. The exhaust system according to claim 1, further comprising:
an outer exhaust duct located adjacent to the primary exhaust duct creating a gap therebetween.
7. The exhaust system according to claim 6, wherein the gap is configured for the flow of cooling air between the primary exhaust duct and the outer exhaust duct.
8. The exhaust system according to claim 7, wherein the cooling air is drawn from an inlet formed between a base portion of the outer exhaust duct and the primary exhaust duct.
9. The exhaust system according to claim 6, further comprising:
an actuator configured for imparting a rotational force to the primary exhaust duct.
10. The exhaust system according to claim 9, further comprising:
a drive belt operably associated with the actuator, the drive belt at least partially wrapped around the outer exhaust duct.
11. The exhaust system according to claim 1, further comprising:
a bellows seal in pressing contact with the fixed exhaust and the primary exhaust duct, the bellows seal being configured to prevent the leakage of exhaust gas while allowing a relative rotation between the fixed exhaust and the primary exhaust duct.
12. An exhaust system for a tiltrotor aircraft, the exhaust system comprising:
a nacelle configured for housing an engine, the nacelle being rotatable relative to a wing of the tiltrotor aircraft, wherein the nacelle is rotatably between an approximately vertical orientation configurable for a helicopter mode operation of the tiltrotor aircraft and an approximately horizontal orientation configurable for an airplane mode operation of the tiltrotor aircraft;
a fixed exhaust in gaseous communication with an engine;
a vector nozzle comprising:
a primary exhaust duct in gaseous communication with the fixed exhaust, the primary exhaust being rotatable relative to the fixed exhaust;

a control system configured to process an input to selectively command an actuator to rotate the vector nozzle.
13. The exhaust system according the claim 12, wherein the input is one of:
a pilot control input;
an operating condition input; and
an automatic control input.
14. The exhaust system according the claim 12, wherein the control system is configured to selectively position the vector nozzle in a helicopter hover ground heating reduction mode such that an exhaust flow is directed in an aftward direction while the nacelle is positioned approximately vertical.
15. The exhaust system according the claim 12, wherein the control system is configured to selectively position the vector nozzle in a helicopter hover infrared signature suppression mode such that an exhaust flow is directed in an upward direction while the nacelle is positioned approximately vertical.
16. The exhaust system according the claim 12, wherein the control system is configured to selectively position the vector nozzle in an airplane infrared signature suppression mode such that an exhaust flow is directed in an upward direction while the nacelle is positioned approximately horizontal.
17. The exhaust system according the claim 12, the vector nozzle further comprising:
an outer exhaust duct located adjacent to the primary exhaust duct creating a gap therebetween, the outer exhaust duct being configured to hide the primary exhaust duct from a line of site vision of an infrared signature detector.
18. The exhaust system according to claim 12, the vector nozzle further comprising:
an outer exhaust duct located adjacent to the primary exhaust duct creating a gap therebetween, the gap being configured to allow for a flow of cooling air between the primary exhaust duct and the outer exhaust duct.
19. A method of suppressing infrared signature of a tiltrotor aircraft having a nacelle, the method comprising:
orienting a rotatable vector nozzle to direct an exhaust gas in an upward direction;
maintaining an approximate orientation of the rotatable vector nozzle as the nacelle rotates between a vertical position and a horizontal position by rotating the rotatable vector nozzle relative to the nacelle.
20. The method according to claim 19, wherein the step of maintain the approximate orientation of the rotatable vector nozzle is achieved by rotating the vector nozzle in the opposite direction of the nacelle rotation direction.