1. A sampled data averaging circuit for sampling input data a plurality of times and calculating an average value of the sampled data, comprising:
sampling times setting means for setting a number of sampling times;
sampling means for sampling, at predetermined timing, the input data by the number of sampling times set by said sampling times setting means;
division means for dividing the sampled data by the number of samplings set by said sampling times setting means, for each time that the data sampling is performed by said sampling means; and
accumulation means for sequentially accumulating a division result of said division means,
wherein an average value is obtained from accumulation results of said accumulation means.
2. The sampled data averaging circuit according to claim 1, wherein if the data sampled by said sampling means is N bits (where N is an integer greater than or equal to 1), the division result is N+M bits (where M is an integer greater than or equal to 1), and the number of sampling times set by said sampling times setting means is 2I (where I is an integer greater than or equal to 1, and I\u2266M), then said division means shifts the sampled data in a lower bit direction by I bits from the upper N+M bits, and sets the remaining bits to 0, to generate the division result of N+M bits, and supplies the division result to said accumulation means.
3. The sampled data averaging circuit according to claim 2, wherein said division means is a data storage selector having N+M selector circuits.
4. The sampled data averaging circuit according to claim 2, wherein said accumulation means accumulates the (N+M)-bit division result, and takes the upper N bits of the accumulation result as the average value.
5. The sampled data averaging circuit according to claim 4, wherein said accumulation means includes a data addition circuit and a sampled data storage circuit, said data addition circuit adds the (N+M)-bit division result to an output of said sampled data storage circuit, and said sampled data storage circuit stores the addition result of said data addition circuit.
6. The sampled data averaging circuit according to claim 2, wherein said accumulation means sets an accumulation initial value with the (N+1)-th bit from the most significant bit being 1 and the remaining bits being 0, so that the average value of the upper N bits is calculated, with the lower M bits of the accumulation result being rounded-off.
7. The sampled data averaging circuit according to claim 1, wherein said sampling means samples, at the predetermined timing, the input data by the number of sampling times set by said sampling times setting means plus two, and
said accumulation means includes:
maximum value detection means for detecting the maximum value of data values which are division results of said division means;
minimum value detection means for detecting the minimum value of data values which are division results of said division means, and
computing means for subtracting said maximum value and said minimum value from a result of accumulation of division results of said division means by the number of sampling times plus two so as to obtain the accumulation result for the number of sampling times.
8. The sampled data averaging circuit according to claim 1, wherein said sampling times setting means inputs an arbitrary data value, and stores the input data value as the number of sampling times.
9. A sampled data averaging method for sampling input data a plurality of times and calculating an average value of the sampled data, the method comprising the steps of:
setting a number of sampling times;
sampling, at predetermined timing, the input data by the number of sampling times set in the setting step;
dividing the sampled data by the number of samplings set in the setting step, for each time that the sampling of the input data is performed in the sampling step;
sequentially accumulating the division results; and
obtaining an average value from the accumulation result.
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. Portable electronic device antenna structures in a portable electronic device, comprising:
first, second, and third resonating elements aligned along a common axis parallel to a ground plane and that are each connected to the ground plane, wherein the first and second resonating elements are fed using respective antenna feed terminals and form respective first and second antennas and wherein the third resonating element is not fed by any antenna feed terminals.
2. The portable electronic device antenna structures defined in claim 1 further comprising:
a first transmission line having a first positive conductor coupled to the antenna feed terminal of the first resonating element and a first ground conductor coupled to the ground plane; and
a second transmission line having a second positive conductor coupled to the antenna feed terminal of the second resonating element and a second ground conductor coupled to the ground plane.
3. The portable electronic device antenna structures defined in claim 2 wherein the third resonating element is interposed between the first and second resonating elements.
4. The portable electronic device antenna structures defined in claim 3 wherein the ground plane comprises metal housing structures in the portable electronic device.
5. The portable electronic device antenna structures defined in claim 1 wherein at least one of the first and second resonating elements comprises a dual-band antenna that operates in a first communications band and a second communications band.
6. The portable electronic device antenna structures defined in claim 5 wherein the third resonating element is configured to resonate in at least the first communications band.
7. The portable electronic device antenna structures defined in claim 5 wherein the third resonating element is configured to resonate in at least the first communications band to isolate the first resonating element from the second resonating element in at least the first communications band.
8. The portable electronic device antenna structures defined in claim 1 wherein the first antenna comprises a first dual-band antenna that operates in a first communications band and a second communications band and wherein the second antenna comprises a second dual-band antenna that operates in the first communications band and the second communications band.
9. The portable electronic device antenna structures defined in claim 8 wherein the third resonating element is configured to resonate in at least the first communications band.
10. The portable electronic device antenna structures defined in claim 8 wherein the third resonating element is configured to resonate in at least the first communications band to isolate the first dual-band antenna from the second dual-band antenna in at least the first communications band.
11. The portable electronic device antenna structures defined in claim 1 wherein the third resonating element comprises L-shaped conductive structures.
12. A portable electronic device, comprising:
first, second, and third resonating elements that are parallel to a common axis and that are each connected to a common ground element, wherein the first and second resonating elements are fed using respective antenna feed terminals and form respective first and second antennas and wherein the third resonating element is not fed by any antenna feed terminals;
a first transmission line having a first positive conductor coupled to the antenna feed terminal of the first resonating element and a first ground conductor coupled to the common ground element; and
a second transmission line having a second positive conductor coupled to the antenna feed terminal of the second resonating element and a second ground conductor coupled to the common ground element.
13. The portable electronic device defined in claim 12 wherein the third resonating element is interposed between the first and second resonating elements.
14. The portable electronic device defined in claim 12 further comprising metal housing structures that form at least part of the common ground element.
15. The portable electronic device antenna structures defined in claim 12 wherein at least one of the first and second antennas comprises a dual-band antenna that operates in a first communications band and a second communications band.
16. The portable electronic device antenna structures defined in claim 15 wherein the third resonating element is configured to resonate in at least the first communications band.
17. The portable electronic device antenna structures defined in claim 15 wherein the third resonating element is configured to resonate in at least the first communications band to isolate the first resonating element from the second resonating element in at least the first communications band.
18. The portable electronic device antenna structures defined in claim 15 wherein the third resonating element comprises L-shaped conductive structures.
19. The portable electronic device antenna structures defined in claim 12 the first resonating element comprises a first antenna that is configured to handle communications at a frequency of 2.4 GHz and communications at a frequency of 5.1 GHz, wherein the second resonating element comprises a second antenna that is configured to handle communications at the frequency of 2.4 GHz, and wherein the third resonating element is configured to resonating at the frequency of 2.4 GHz to isolate the first antenna and the second antenna from each other in at least the frequency of 2.4 GHz.