1. A signal processing device configured to perform object detection processing for obtaining a peak signal indicative of a frequency difference between a transmitting signal of which a frequency is cyclically varying and a receiving signal obtained by receiving a reflection wave from an object which reflects a transmission wave based on the transmission signal, for each of a first period in which the frequency of the transmission signal is increasing and a second period in which the frequency is decreasing, and for pairing the peak signal obtained in the first period and the peak signal obtained in the second period, thereby detecting a sensing point indicative of a reflection point on the object associated with the peak signals, the signal processing device comprising:
a storage section configured to store data indicative of a past sensing point which is the sensing point detected in the object detection processing performed in the past, and a counter value indicative of existence possibility of the past sensing point;
a determination section configured to determine whether the past sensing point has continuity to a recent sensing point which is the sensing point detected in the object detection processing performed after detecting the past sensing point;
a decrement section configured to decrease the counter value associated with the past sensing point determined by the determination section as having no continuity to the recent sensing point;
a deletion section configured to delete, from the storage section, the data indicative of the past sensing point previously stored and associated with the counter value when the counter value become less than a first threshold value;
an identification section configured to identify a sensing point of a moving object as a wrong paring candidate sensing point possibly detected by pairing the peak signals in a wrong manner if a number of peak signals of the sensing point of the moving object exceeds a threshold value of one of areas in which the moving object is classified, wherein the moving object is classified in the one of the areas on a map, wherein the map includes the areas divided by a predetermined distance in a vertical direction with respect to an own vehicle and predetermined distance in a horizontal direction with respect to the own vehicle and the threshold value of the number of the peak signals is set for each of the areas; and
a changing section configured to set a decreasing value of the past sensing point identified as a wrong paring candidate sensing point so as to greater than a decreasing value of the other past sensing points.
2. The signal processing device according to claim 1, further comprising:
an increment section configured to increase the counter value associated with the past sensing point determined by the determination section as having the continuity to the recent sensing point; and
an output section configured to, in a case where the counter value increased by the increment section is no less than a second threshold value which is larger in value than the first threshold value, output object data which includes information of the sensing point to a vehicle control device for controlling devices equipped in a vehicle,
wherein the decrement section is configured to decrease the counter value associated with the wrong paring candidate sensing point twice or more until the counter value becomes less than the first threshold value, in a case where the wrong paring candidate sensing point of which the counter value is no less than the second threshold value is determined by the determination section as having no continuity to the recent sensing point.
3. A radar device, comprising:
the signal processing device according to claim 1; and
an antenna configured to output the transmission wave, and
receive the reflection wave.
4. A vehicle control system, comprising:
the radar device according to claim 3, which is configured to be equipped in a vehicle; and
a vehicle controller configured to control devices equipped in the vehicle.
5. A signal processing method configured to perform object detection processing for obtaining a peak signal indicative of a frequency difference between a transmitting signal of which a frequency is cyclically varying and a receiving signal obtained by receiving a reflection wave from an object which reflects a transmission wave based on the transmission signal, for each of a first period in which the frequency of the transmission signal is increasing and a second period in which the frequency is decreasing, and for pairing the peak signal obtained in the first period and the peak signal obtained in the second period, thereby detecting a sensing point indicative of a reflection point on the object associated with the peak signal, the signal processing method comprising:
storing, in a storage section, data indicative of a past sensing point which is the sensing point detected in the object detection processing performed in the past, and a counter value indicative of existence possibility of the past sensing point;
determining whether the past sensing point has continuity to a recent sensing point which is the sensing point detected in the object detection processing performed after detecting the past sensing point;
decreasing the counter value associated with the past sensing point determined by the determining as having no continuity to the recent sensing point;
deleting, from the storage section, the data previously stored and indicative of the past sensing point associated with the counter value when the counter value becomes less than a first threshold value;
identifying a sensing point of a moving object as a wrong paring candidate sensing point possibly detected by pairing the peak signals in a wrong manner if a number of peak signals of the sensing point of the moving object exceeds a threshold value of one of areas in which the moving object is classified, wherein the moving object is classified in the one of the areas on a map, wherein the map includes the areas divided by a predetermined distance in a vertical direction with respect to an own vehicle and a predetermined distance in a horizontal direction with respect to the own vehicle and the threshold value of the number of the peak signals is set for each of the areas; and
setting a decreasing value of the past sensing point identified as the wrong paring candidate sensing point so as to be greater than a decreasing value of the other past sensing points.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
I claim:
1. A saw blade for making circular openings in construction materials having an attachable end and a free end, the attachable end being adapted to be attached to a handle, motor and holder assembly so that an up and down stroking motion can be provided to the saw blade, the saw blade being concave in cross-section along substantially its whole length from said free end to a point near said attachable end, the degree of curvature of the blade being the same throughout the length of the blade that is concave in cross-section, and said degree of curvature being that necessary to make a circular opening of the size desired.
2. A saw blade as claimed in claim 1 for making circular openings of at least 1 inch in diameter, in which the distance across the outside surface of said length of the blade in a plane at right angles to the longitudinal axis of the blade is at least inches.
3. A saw blade as claimed in claim 2 for making circular openings of from about 1 inch to about 12 inches in diameter, in which said distance across the outside surface of said length of the blade is from about inches to about inches.
4. A saw blade as claimed in claim 2 for making circular openings of from about 1 inch to about 4 inches in diameter, in which said distance across the outside surface of said length of the blade is from about inches to about inches.
5. A saw blade as claimed in claim 2 for making circular openings of about 1 inch in diameter, in which said distance across the outside surface of said length of the blade is about {fraction (516)} inches.
6. A saw blade as claimed in claim 2, that is from about 2 inches to about 6 inches in length.
7. A saw blade as claimed in claim 5, that is about 4 inches in length.
8. A saw blade as claimed in claim 6, that is made of steel.
9. A saw blade as claimed in claim 8, that is made of bimetal steel.
10. A saw blade as claimed in claim 2, for making circular openings in a construction material selected from the group consisting of construction metals, plaster containing wire mesh and plastic.
11. A saw blade as claimed in claim 9, for making circular openings in a construction material selected from the group consisting of steel, copper and aluminum.
12. A saw blade as claimed in claim 10, for making circular openings in steel of from about {fraction (116)} inch to about inch in thickness.
13. A saw blade as claimed in claim 11, for making circular openings in steel of about 2 mm in thickness.
14. A saw for making circular openings in construction materials, comprising a handle, motor and holder assembly, and a saw blade having an attachable end and a free end, said attachable end being adapted to be attached to the assembly so that the assembly can provide an up and down stroking motion to the blade, the blade being concave in cross-section along substantially its whole length from said free end to a point near said attachable end, the degree of curvature being the same throughout said length of the blade that is concave in cross-section, and said degree of curvature being that necessary to make a circular opening of the size desired.
15. A saw as claimed in claim 14, in which the saw blade can be detached from the assembly and replaced with another saw blade of a different degree of curvature to make a circular opening of a different size.
16. A saw as claimed in claim 14, in which the assembly can provide an up and down stroking motion to the saw blade in the range of from about 400 to about 3,200 strokes per minute.
17. A saw as claimed in claim 15, in which the assembly can provide an up and down stroking motion to the saw blade in the range of from about 400 to about 500 strokes per minute.
18. A saw as claimed in claim 16 for making circular openings of at least 1 inch in diameter, in which the distance across the outside surface of said length of the blade in a plane at right angles to the longitudinal axis of the blade is at least inches.
19. A saw as claimed in claim 17 for making circular openings of from about 1 inch to about 4 inches in diameter, in which said distance across the outside surface of said length of the blade is from about inches to about inches.
20. A saw as claimed in claim 18, in which said blade is from about 2 inches to about 6 inches in length.
21. A saw as claimed in claim 19, in which the saw blade is made of steel.
22. A method of making circular openings in construction materials with a saw, having a handle, motor, and holder assembly, the saw having a saw blade with an attachable end and a free end, said attachable end being attached to said assembly so that said assembly can provide an up and down stroking motion to said blade, said blade having a cutting edge and being concave in cross section along substantially its whole length from its free end to a point near said attachable end, the degree of curvature being the same throughout said length of the blade that is concave in cross section, and the degree of curvature being that necessary to make a circular opening of the size desired, in which a circle of the size of the opening desired is drawn on a construction material, a hole is drilled in the construction material inside and abutting said circle of a size slightly larger than that necessary to receive said blade, said blade is inserted in said hole, said blade is provided with an up and down stroking motion by said assembly, and the cutting edge of the said blade is moved around said circle to make the desired opening in said construction material.