Author: claimsbot

1. A baseball bat swing training device for training a batter to swing a baseball bat level, the baseball bat swing training device comprising:
a baseball bat coupling for attachment to a baseball bat;
a line having a first end, a second end and a total length, the second end of the line attached to the baseball bat coupling; and
a single-unit line controller configured for attachment to a horizontal structure that is vertically over the head of the batter and to vertically hang from the horizontal structure so as to be over the head of the batter, the single-unit line controller retaining both the first end of the line and an excess length of line of the total length of line, the single-unit line controller adapted to vary and to fix a working length of line of the excess length of line, the working length defined as from the single-unit line controller to the baseball bat coupling;
wherein the single-unit line controller varies and fixes the working length of line by receiving, storing and releasing the excess length of line from itself; and
wherein the single-unit line controller comprises:
a line reel;
a clamp; and
whereby the fixed working length of line limits swinging of the baseball bat connected by the baseball bat coupling to the fixed working length of line by the batter to not below a level baseball bat swing.
2. The baseball bat swing training device of claim 1, wherein the reel comprises:
a spool; and
a bracket rotatably carrying the spool.
3. The baseball bat swing training device of claim 1, wherein the baseball bat coupling comprises a collar.
4. The baseball bat swing training device of claim 1, wherein the baseball bat coupling is configured to attach to the baseball bat at a location taken from a handle of the baseball bat that is approximately 50% of an overall length of the baseball bat.
5. A baseball bat swing training device for training a batter to swing a baseball bat level, the baseball bat swing training device comprising:
a frame having horizontal member that is situated to be over the head of the batter during use;
a coupling for attachment to a baseball bat;
a line having a first end, a second end and a total length, the second end of the line attached to the coupling; and
a single-unit line controller vertically hanging from the horizontal member over the head of the batter, the single-unit line controller retaining both the first end of the line and an excess length of line of the total length of line, the single-unit line controller adapted to vary and to fix a working length of line of the excess length of line, the working length defined as from the single-unit line controller to the baseball bat coupling; and
wherein the single-unit line controller comprises a combined reel and clamp; and
whereby the fixed working length of line limits swinging of the baseball bat connected by the baseball bat coupling to the fixed working length of line by the batter to not below a level baseball bat swing.
6. The baseball bat swing training device of claim 5, wherein the frame further comprises a vertical leg structure, the horizontal member being supported by and extending from an upper end of the vertical leg structure to situate the horizontal member over the head of the batter during use.
7. The baseball bat swing training device of claim 6, wherein the vertical leg structure is vertically adjustable.
8. The baseball bat swing training device of claim 7, further comprising a base situated at a lower end of the vertically adjustable leg structure.
9. The baseball bat swing training device of claim 8, wherein the base comprises a tripod.
10. The baseball bat swing training device of claim 5, wherein the reel comprises:
a spool; and
a bracket rotatably carrying the spool.
11. The baseball bat swing training device of claim 5, wherein the coupling comprises a collar.
12. The baseball bat swing training device of claim 5, wherein coupling is configured to attach to the baseball bat at a location taken from a handle of the baseball bat that is approximately 50% of an overall length of the baseball bat.

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

1-16. (canceled)
17. A transponder for receiving an interrogation signal from a first reader at a first frequency and sending a response signal from the transponder at a third frequency, while mitigating interference effects from interfering signals from a plurality of second readers at at least one second frequency, the transponder comprising:
an antenna for receiving the interrogation signal from the first reader and the interfering signals from the plurality of second readers;
a detector in communication with the antenna, said detector detecting the interrogation signal and outputting a baseband analog signal representing the interrogation signal;
a frequency-selective filter that reduces interference from the plurality of second readers and outputs an analog signal having a desired modulation; and
a signal processor in communication with the frequency-selective filter to receive the analog signal, said signal processor processing the analog signal to extract information from the analog signal.
18. The transponder of claim 17, wherein the frequency-selective filter comprises an input, an output, a resistor coupled between the input and the output, and a capacitor coupled between the output and a ground.
19. The transponder of claim 17, wherein the signal processor comprises:
a limiter for receiving the analog signal from the frequency-selective filter and generating a digital signal; and
a baseband decoder for receiving the digital signal from the limiter.
20. A transponder for receiving an interrogation signal from a first reader at a first frequency and sending a response signal from the transponder at the first frequency, while mitigating interference effects from interfering signals from a plurality of second readers at at least one second frequency, the transponder comprising:
an antenna for receiving the interrogation signal from the first reader and the interfering signals from the plurality of second readers;
a detector in communication with the antenna, said detector detecting the interrogation signal and the interfering signals and outputting a baseband analog signal representing the interrogation signal, the interfering signals, and a combination of the interrogation signal and the interfering signals;
a frequency-selective filter that receives the baseband analog signal output by the detector, reduces interference from the plurality of second readers by an amount proportional to a square of the interfering signal and outputs an analog signal; and
a signal processor in communication with the frequency-selective filter to receive the analog signal output by the frequency-selective filter, said signal processor processing the analog signal output by the frequency-selective filter to extract information from the analog signal output by the frequency-selective filter.
21. The transponder of claim 20, wherein the signal processor comprises:
a limiter for receiving the analog signal from the frequency-selective filter and generating a digital signal; and
a baseband decoder for receiving the digital signal from the limiter.
22. A transponder for receiving an interrogation signal from a first reader at a first frequency and sending a response signal from the transponder at a third frequency, while mitigating interference effects from interfering signals from a plurality of second readers at at least one second frequency, the transponder comprising:
an antenna for receiving the interrogation signal from the first reader and the interfering signals from the plurality of second readers;
a detector in communication with the antenna, said detector detecting the interrogation signal and the interfering signals and outputting a baseband analog signal representing the interrogation signal, the interfering signal, and a combination of the interrogation signal and the interfering signals;
a frequency-selective filter filtering the baseband analog signal to output an analog signal, wherein the interfering signals are reduced by an amount proportional to a square of the interfering signals; and
a signal processor in communication with the frequency-selective filter to receive the analog signal output by the frequency-selective filter, said signal processor processing the analog signal with the reduced interference to extract information from the analog signal output by the frequency-selective filter.
23. The transponder of claim 22, wherein the signal processor comprises:
a limiter for receiving the analog signal from the frequency-selective filter and generating a digital signal; and
a baseband decoder for receiving the digital signal from the limiter.

1. A system for collecting and projecting an image so as to create a visual effect comprising:
an image assembly capable of collecting at least one image;
an image projection assembly capable of projecting the at least one image collected by the image collection assembly;
a plurality of mirrors capable of reflecting the at least one image as it is being projected by the image projection assembly; and
a screen assembly capable of receiving the at least one image being reflected from the plurality of mirrors, the screen assembly being operably associated with the image collection assembly, the image projection assembly, and the plurality of mirrors such that when the at least one image and is received by the screen assembly a visual affect is created.
2. The system of claim 1, wherein the at least one image is a plurality of images that are sequentially captured by the image capturing assembly and sequentially projected by the image projection assembly to thereby create a moving visual effect.
3. The system of claim 2, wherein the screen assembly has a concaved reflecting surface for receiving the plurality of the images.
4. The system of claim 3, wherein the visual effect is a three-dimensional effect.
5. The system of claim 4, further including a sound system.
6. The system of claim 4, wherein the image capturing assembly includes a fisheye lens.
7. The system of claim 6, wherein the fisheye lens includes at least one anamorphic element.
8. The system of claim 6, wherein the fisheye lens has a focal length in a range from about 20 mm to about 30 mm.
9. The system of claim 6, wherein the image projection assembly includes a lens having an anamorphic element.
10. The system of claim 4, wherein the plurality of mirrors includes at least 3 mirrors having a substantially flat surface and at least one mirror having a substantially curved surface.
11. The system of claim 8, wherein the plurality of mirrors includes at least 3 mirrors having a substantially flat surface and at least one mirror having a substantially curved surface.
12. The system of claim 10, wherein the at least one mirror having a substantially curved surface is curved in a substantially non-uniform manner.
13. The system of claim 11, wherein the at least one mirror having a substantially curved surface is curved in a substantially non-uniform manner.
14. The system of claim 4, wherein the concaved reflecting surface of the screen assembly has an arc to cord ratio of about 2 to 1.
15. The system of claim 4, wherein the concaved reflecting surface of the screen assembly further includes a plurality of horizontally oriented substantially parallel elongated louvers, wherein each louver has a top edge, a bottom edge, a length and a width.
16. The system of claim 15, wherein the horizontally oriented substantially parallel elongated plurality of louvers overlap one another.
17. The system of claim 16, wherein each of the horizontally oriented substantially parallel elongated louvers are tilted at an angle in a range from about 10 degrees to about 20 degrees such that the bottom edge of each of the substantially parallel elongated louvers is closer to the image projector assembly than the top edge of the louver.
18. The system of claim 17, wherein the width of each louver is in a range from about \xbc inch to about 6 inches.
19. The system of claim 18, further including spacers between each louvers.
20. The system of claim 15, wherein the concaved reflecting surface of the screen assembly has a curve in a vertical plane in a range from about 50 degrees to about 65 degrees.
21. The coordinated system of claim 20, wherein the reflecting surface of the concave screen assembly has a curve in a horizontal plane in a range from about 150 degrees to about 170 degrees.

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 as my invention:

1. A miniature electroacoustic transducer comprising:
a membrane;
a drive element in contact with said membrane for mechanically driving said membrane to cause said membrane to radiate acoustic waves; and
said membrane being divided into at least two sound-producing membrane regions having respective frequency-dependent transmission characteristics.
2. A miniature electroacoustic transducer as claimed in claim 1 wherein said membrane regions include adjacent membrane regions, and wherein said membrane comprises an elastic element disposed between adjacent membrane regions.
3. A miniature electroacoustic transducer as claimed in claim 2 wherein said membrane regions and said elastic element form a mechanically-resonant system.
4. A miniature electroacoustic transducer as claimed in claim 1 wherein said membrane regions are annularly disposed around a common symmetry axis.
5. A miniature electroacoustic transducer as claimed in claim 4 wherein said membrane regions include a center membrane region which is mechanically connected to said drive.