1. A delta modulator for receiving an analog signal, comprising:
a delta operator means for differentiating an output binary code and an analog input signal to produce a differential signal;
a first analog-to-digital converter means for finding a range of the differential signal;
a second analog-to-digital converter means for dynamically adjusting a size of quantized step for quantizing the differential signal based on a result of the first analog-to-digital converter;
a memory unit; and
a digital adder means for adding the output binary code of the memory unit and a digital output code;
wherein, an output addition result of the digital adder is stored into the memory unit, and the second analog-to-digital converter being to dynamically adjust the quantization step size for quantizing the differential signal based on the result of the first analog-to-digital converter.
2. The delta modulator according to claim 1, wherein the first analog-to-digital converter is a coarse analog-to-digital converter, which is used to estimate the range of the differential signal and set several ranges, under fixed or non-fixed quantization step size, the range of the sampling signal difference is estimated in order to prevent the overload of differential signal.
3. The delta modulator according to claim 1, wherein the second analog-to-digital converter is a fine analog-to-digital converter, which uses binary search method to solve the differential voltage until minimum bit or minimum unit defined by the user.
4. The delta modulator according to claim 1, wherein the analog signal is a multiple channel signal, which is selected by a multiplier.
5. The delta modulator according to claim 4, wherein the channel signal is selected according to a corresponding channel memory.
6. The delta modulator according to claim 1, wherein the memory unit is a multiple channel memory.
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 cutting apparatus comprising:
a frame including a first end and a second end;
a conveyor arrangement for moving a stone workpiece relative to the frame in a longitudinal direction, the conveyor arrangement defining a V-shaped channel for supporting the stone workpiece as the stone workpiece moves along the longitudinal direction from the first end to the second end of the frame, the conveyor arrangement including a first motorized conveyor operatively attached to the frame;
a cutting blade arrangement including a first rotatable cutting blade operatively attached to the frame and positioned generally perpendicular to the first motorized conveyor.
2. A cutting apparatus according to claim 1, wherein the conveyor arrangement includes a second motorized conveyor operatively attached to the frame, the first motorized conveyor disposed at an angle of about 45 degrees to a reference plane parallel to the longitudinal direction and the second motorized conveyor disposed at an angle of about 135 degrees to the reference plane, the second motorized conveyor positioned perpendicularly to the first motorized conveyor so as to form the V-shaped channel of the conveyor arrangement.
3. A cutting apparatus according to claim 2, wherein the first conveyor and the second conveyor are configured to operate at generally the same speed.
4. A cutting apparatus according to claim 2, wherein the cutting blade arrangement includes the first rotatable cutting blade operatively attached to the frame and a second rotatable cutting blade operatively attached to the frame and positioned generally perpendicular to the first rotatable cutting blade.
5. A cutting apparatus according to claim 4, further comprising a first blade motor and a second blade motor attached to the frame, the first and second blade motors configured to operate the first and second rotatable cutting blades, respectively.
6. A cutting apparatus according to claim 5, further comprising a controller for adjusting the speed of the first and second conveyors based on an inverse relation to a load detected on at least one of the first and second blade motors.
7. A cutting apparatus according to claim 6, wherein the controller is configured to detect the load on both of the first and second blade motors at the same time and is configured to adjust the speed of the first and second conveyors based on the maximum detected load on the first and second blade motors.
8. A cutting apparatus according to claim 2, further comprising a controller for adjusting the speed of the first and second motorized conveyors based on an inverse relation to a load detected on a motor operating the first rotatable cutting blade.
9. A cutting apparatus according to claim 2, wherein the first rotatable cutting blade is movable toward and away from both the first and second motorized conveyors.
10. A cutting apparatus according to claim 9, wherein the cutting blade arrangement includes the first rotatable cutting blade operatively attached to the frame and a second rotatable cutting blade operatively attached to the frame and positioned generally perpendicular to the first rotatable cutting blade, wherein the second cutting blade is also movable toward and away from both the first and second conveyors.
11. A cutting apparatus according to claim 2, wherein the second conveyor extends farther back relative to the rear end of the frame than the first conveyor.
12. A cutting apparatus according to claim 2, wherein the reference plane is defined by the ground surface supporting the cutting apparatus.
13. A method of assembling a cutting apparatus for cutting at least a portion of a stone workpiece, the method comprising;
providing a motorized conveyor arrangement configured to carry the stone workpiece, the conveyor arrangement including a first conveyor and a second conveyor;
positioning the first conveyor perpendicularly to the second conveyor so as to form a V-shaped arrangement therewith;
providing a first rotatable cutting blade configured to cut the stone workpiece; and
positioning the first rotatable cutting blade generally parallel to at least one of the first conveyor and the second conveyor.
14. A method according to claim 13, further comprising positioning the first conveyor at an angle of about 45 degrees from a reference plane and positioning the second conveyor at an angle of about 135 degrees from the reference plane.
15. A method according to claim 14, wherein the reference plane is defined by the ground surface supporting the cutting apparatus.
16. A method according to claim 13, further comprising providing a second rotatable cutting blade configured to cut the stone workpiece, the second rotatable cutting blade being positioned generally perpendicular to the first rotatable cutting blade.
17. A method according to claim 16, wherein both the first and the second rotatable cutting blades are movable toward and away from both the first and second conveyors.
18. A method according to claim 16, further comprising providing a first blade motor for operating the first rotatable cutting blade and providing a second blade motor for operating the second rotatable cutting blade.
19. A method according to claim 13, further comprising providing a first conveyor motor for operating the first conveyor and providing a separate second conveyor motor for operating the second conveyor.