1. A wireless communication device comprising:
a reception circuit receiving a data frame including first and second data units, the first and second data units each including a first data area and a second data area following the first data area, the first data area including channel bandwidth information of the data frame; and
a control circuit controlling the reception circuit based on the channel bandwidth information,
wherein, the reception circuit receives the first data area of the first data unit with a first frequency bandwidth corresponding to a first channel bandwidth for the first data unit,
when the channel bandwidth information is indicative of a second channel bandwidth different from the first channel bandwidth, the control circuit switches, before the reception circuit receives the second data, a frequency bandwidth of the reception circuit to a second frequency bandwidth corresponding to the second channel bandwidth.
2. The device according to claim 1, wherein, in conjunction with switching of the frequency bandwidth of the reception circuit,
the control circuit switches a center frequency of the reception circuit from a first center frequency to a second center frequency different from the first center frequency.
3. The device according to claim 2, wherein an estimated value of a frequency offset in the second center frequency is generated based on
foff2=foff1+(f2\u2212f1)\xd7Moff106
where f1 is the first center frequency, f2 is the second center frequency, foff1 is an estimated value for a frequency offset of the first center frequency between the transmitting device and the receiving device before switching of the center frequency, foff2 is an estimated value for the frequency offset of the second center frequency between the transmitting device and the receiving device after switching of the center frequency, Moff (unit:ppm) is a value of the frequency offset between an expected value and an actual value in the reception circuit.
4. The device according to claim 1, wherein,
when the frequency bandwidth is switched to the second frequency bandwidth,
the control circuit adjusts set values for a frequency offset compensation of the reception in the second frequency bandwidth based on a value of the frequency offset compensation before switching of the frequency bandwidth.
5. The device according to claim 1, wherein,
when the frequency bandwidth is switched to the second frequency bandwidth,
the control circuit adjusts a gain of the reception circuit in the second frequency bandwidth based on a value of the gain before switching of the frequency bandwidth.
6. The device according to claim 5, wherein
the control circuit increases the value of the gain before switching of the frequency bandwidth of the reception circuit to adjust the set value of the gain.
7. The device according to claim 1, wherein,
when the frequency bandwidth is switched to the second frequency bandwidth,
the control circuit adjusts a set value for a time of the reception circuit in the second frequency bandwidth based on a value of the time before switching of the frequency bandwidth.
8. The device according to claim 7, wherein
the control circuit uses an value corresponding to a change of a signal path of the reception circuit to adjust the set value for the time.
9. The device according to claim 1, wherein
the control circuit switches the frequency bandwidth of the reception circuit from the second frequency bandwidth to the first bandwidth after a reception of the data frame is completed.
10. The device according to claim 1, wherein
when the channel bandwidth information is indicative of the first channel bandwidth,
the control circuit maintains the frequency bandwidth of the reception circuit to the first frequency bandwidth, and
the reception circuit receives the second data area of the first data unit with the first frequency bandwidth.
11. The device according to claim 1, wherein
the reception circuit includes:
a first circuit which outputs a first oscillation signal corresponding to a first center frequency of the reception circuit;
a second circuit which outputs a second oscillation signal corresponding to a second center frequency of the reception circuit; and
a selection circuit which selects one of the first and second oscillation signals,
the selection circuit selects the first oscillation signal before switching of the frequency bandwidth of the reception circuit,
the selection circuit selects the second oscillation signal after the switching of the frequency bandwidth of the reception circuit,
the reception circuit receives the data frame by using a selected oscillation signal among the first and second oscillation signals.
12. The device according to claim 1, wherein
the reception circuit includes:
a first circuit which outputs a first signal having a first frequency;
a second circuit which outputs a second signal or a third signal; and
a third circuit which generates a first oscillation signal corresponding to a first center frequency of the reception circuit based on the first and second signals before switching of the frequency bandwidth of the reception circuit, and generates a second oscillation signal corresponding to a second center frequency of the reception circuit based on the first and third signals after the switching of the frequency bandwidth of the reception circuit,
the reception circuit receives the data frame by using a generated oscillation signal among the first and second oscillation signals.
13. The device according to claim 1, wherein
the reception circuit includes a first circuit selectivity which retrieves the channel bandwidth information included in the first data area.
14. The device according to claim 1, wherein
the data frame is based on IEEE 802.11ac, and
the control circuit switches the frequency bandwidth of the reception circuit during a reception period for a VHT-STF in the data frame based on bandwidth information in a VHT-SIG-A in the data frame.
15. A wireless communication device comprising:
a reception circuit receiving a data frame including first and second data units, the first and second data units each including a first data area and a second data area following the first data area; and
a control circuit controlling the reception circuit based on an analysis result of the first data area,
wherein, the reception circuit receives the first data area with a first frequency bandwidth corresponding to a first channel bandwidth for the first data unit,
the control circuit switches, before the reception circuit receives the second data, a frequency bandwidth of the reception circuit to a second frequency bandwidth different from the first frequency bandwidth.
16. The device according to claim 15, wherein,
in conjunction with switching of the frequency bandwidth of the reception circuit,
the control circuit switches a center frequency of the reception circuit from a first center frequency to a second center frequency different from the first center frequency.
17. The device according to claim 15, wherein
when the frequency bandwidth is switched to the second frequency bandwidth,
the control circuit adjusts at least one of set values of the frequency offset, gain and time of the reception circuit based on set values before switching of frequency band width.
18. A method of controlling a wireless communication device,
receiving, by using a reception circuit, the data frame including first and second data units with a first frequency bandwidth corresponding to a first channel bandwidth of the first data unit, each of the first and data units including a first data area and a second data area following the first data area;
analyzing the first data area; and
switching the frequency bandwidth of the reception circuit to a second frequency bandwidth different from the first frequency bandwidth based on a result of the analyzing of the first data area before a reception of the second data area.
19. The method according to claim 18, further comprising:
switching a center frequency of the reception circuit from a first center frequency to a second center frequency different from the first center frequency when the frequency bandwidth is switched to the second frequency bandwidth.
20. The method according to claim 18, further comprising:
adjusting at least of set values of a frequency offset, a gain and a time of the reception circuit based on set values before the switching of the frequency bandwidth, when the frequency bandwidth is switched to the second frequency bandwidth.
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 self-sealing, molded plastic closure assembly for application to a container for a pressurized or gas-sensitive product, said assembly comprising a closure, the container having a rim that defines an opening, said closure comprising:
a top panel that is adapted to span the opening of the container;
an annular skirt depending from the top panel and being adapted to secure the closure assembly to a finish of the container, the finish being below the rim; and
an annular seating fin extending inwardly and downwardly from an interior of the closure and being formed integrally with the top panel and the annular wall of the closure, the sealing fin being adapted to engage a the rim of a the container to be folded into sealing engagement with the rim and a side of the finish of the container when the closure assembly is secured to the container;
said closure assembly further comprising:
a barrier disc inserted in said closure and positioned beneath an underside of the top panel of the closure and adapted to be out of sealing engagement with the rim of the container, the barrier disc being adapted to span the entirety of the opening defined by the rim of the container and to be retained within the closure assembly against the underside of the top panel solely by a folded back free end of the sealing fin when the sealing fin is in engagement with the rim of the container.
2. A closure assembly according to claim 1 wherein the barrier disc is molded or fabricated from a polymeric material whose primary ingredient is selected from the group consisting of EVOH and LCP.
3. A closure assembly according to claim 2 wherein the primary material also includes an oxygen-scavenging material embedded therein.
4. A closure assembly according to claim 1 wherein the closure is molded in a single piece from a material whose primary ingredient is selected from the group consisting of high density polyethylene, polypropylene, low density polyethylene, and co-polymers of polyethylene and polypropylene.
5. A closure assembly according to claim 1 wherein the closure is adapted to be applied to a container by providing the annular skirt of the closure with an inwardly projecting and helically extending continuous or interrupted thread.
6. A closure assembly according to claim 1 wherein:
said barrier disc is a molded or fabricated barrier disc.
7. A package comprising:
a container, said container having a finish with an annular rim; and
a closure assembly applied to the container, the closure assembly comprising a closure, the closure comprising:
a top panel that spans an opening that is defined by the rim of the container;
an annular skirt depending from the top panel and serving to secure the closure assembly to the finish of the container, and
an annular sealing fin having an inner portion that engages the rim of the container and a terminal portion of a side of the finish of the container, the sealing fin being formed integrally with the top panel and the annular wall of the closure;
said closure assembly further comprising:
a barrier disc inserted in said closure and positioned in engagement with an inwardly facing side of the top panel of the closure solely by a folded back free end of the sealing fin and out of sealing engagement with the rim of the container, the barrier disc spanning the entirety of the opening defined by the rim of the container and being contained within the closure assembly, when the closure assembly is in sealing engagement with the container.
8. A package according to claim 7 wherein:
the barrier disc of the closure assembly is molded or fabricated from a polymeric material whose primary ingredient is selected from the group consisting of EVOH and LCP.
9. A package according to claim 7 wherein the primary material of the barrier disc of the closure assembly also includes an oxygen-scavenging material embedded therein.
10. A package according to claim 7 wherein the closure is molded in a single piece from a material whose primary ingredient is selected from the group consisting of high density polyethylene, polypropylene and low density polyethylene, and co-polymers of polyethylene and polypropylene.
11. A package according to claim 7 wherein:
the closure is applied to the container by providing the annular skirt of the closure with an inwardly projecting and helically extending continuous or interrupted thread, and by providing the finish of the container with an outwardly projecting and helically extending continuous or interrupted thread.
12. A package according to claim 7 wherein:
said barrier disc is a molded or fabricated barrier disc.