1. An over-sampling AD converting circuit, comprising:
an input receiving an analog video signal; and
a filter unit limiting a frequency band of the analog video signal in accordance with a sampling frequency that varies depending on a color television system of the analog video signal,
wherein the filter unit includes a plurality of frequency band limiting filters each having a predetermined passing band based on the sampling frequency in accordance with the color television system, the frequency band limiting filter suitable for the sampling frequency being selected from among the plurality of frequency band limiting filters.
2. The over-sampling AD converting circuit according to claim 1, wherein unselected frequency band limiting filters out of the plurality of frequency band limiting filters stop operating.
3. An over-sampling AD converting circuit, comprising:
a first sampling unit executing AD conversion on an input analog video signal with a first sampling frequency;
a frequency band limiting filter unit allowing passage of a signal component in a predetermined passing band out of a signal passing through the first sampling unit;
a second sampling unit sampling the passed signal with a second sampling frequency; and
a switching unit switching the passing band of the frequency band limiting filter unit,
wherein the switching unit determines a color television system of the analog video signal based on the signal sampled with the second sampling frequency to switch the passing band of the frequency band limiting filter unit in accordance with the determined color television system.
4. The over-sampling AD converting circuit according to claim 3, wherein the switching unit switches the first sampling frequency and the second sampling frequency.
5. The over-sampling AD converting circuit according to claim 3, wherein the switching unit switches the passing band of the frequency band limiting filter unit in accordance with the second sampling frequency.
6. The over-sampling AD converting circuit according to claim 3, wherein the first sampling frequency is higher than the second sampling frequency.
7. The over-sampling AD converting circuit according to claim 3, wherein the frequency band limiting filter unit is a low-pass filter that allows passage of a signal component in a frequency range not higher than a cut-off frequency.
8. The over-sampling AD converting circuit according to claim 7, wherein the cut-off frequency is a Nyquist frequency of the second sampling frequency.
9. The over-sampling AD converting circuit according to claim 3, wherein the frequency band limiting filter unit includes a selection unit selecting a filter factor in accordance with the switching of the switching unit.
10. The over-sampling AID converting circuit according to claim 3, wherein the frequency band limiting filter unit includes: a plurality of filters having different passing bands; and a selection unit selecting one of the plurality of filters in accordance with the switching of the switching unit.
11. The over-sampling AD converting circuit according to claim 10, wherein the selection unit stops an operation of unselected filters out of the plurality of filters.
12. The over-sampling AD converting circuit according to claim 3, further comprising:
a first clock generating circuit generating a clock of a first clock frequency in accordance with the switching of the switching unit to apply the clock of the first clock frequency to the first sampling unit and the frequency band limiting filter unit; and
a second clock generating circuit applying a clock of a second clock frequency obtained by dividing the clock of the first clock frequency to the second sampling unit.
13. The over-sampling AD converting circuit according to claim 12, wherein the first clock frequency is the first sampling frequency, and the second clock frequency is the second sampling frequency.
14. A method of sampling an analog video signal, comprising:
receiving the analog video signal; and
limiting a frequency band of the analog video signal in accordance with a sampling frequency that varies depending on a color television system of the analog video signal,
wherein the limiting step comprises:
passing the analog video signal through a filter unit that includes a plurality of frequency band limiting filters each having a predetermined passing band based on the sampling frequency in accordance with the color television system; and
selecting a frequency band limiting filter suitable for the sampling frequency from among the plurality of frequency band limiting filters.
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 turbocharger assembly comprising:
a compressor assembly including a compressor impeller, the compressor impeller including an outermost impeller edge and having a maximum cross-sectional dimension at the outermost impeller edge;
a turbine wheel;
a shaft interconnecting the compressor impeller and the turbine wheel;
a bearing assembly surrounding at least a portion of the shaft; and
a cooling gas conduit disposed in fluid communication with the compressor assembly and the bearing assembly, wherein at least a portion of the cooling gas conduit is disposed adjacent the outermost impeller edge such that the cooling gas conduit is configured to receive a portion of intake gases flowing along the outermost impeller edge and guide the portion of the intake gases toward the bearing assembly to cool the bearing assembly.
2. The turbocharger assembly of claim 1, wherein the cooling gas conduit includes a first end portion and a second end portion, the first end portion being disposed adjacent the outermost impeller edge to facilitate entry of the portion of the intake gases into the cooling gas conduit.
3. The turbocharger assembly of claim 2, wherein the first end portion includes a curved section configured to facilitate entry of the portion of the intake gases into the cooling gas conduit.
4. The turbocharger assembly of claim 4, wherein at least part of the first end portion overlaps the outermost impeller edge.
5. The turbocharger assembly of claim 3, wherein the compressor impeller defines a first impeller end and a second impeller end, and the first end portion is disposed adjacent the second impeller end such that the portion of the intake gases flows into the cooling gas conduit.
6. The turbocharger assembly of claim 2, further comprising a compressor backplate disposed adjacent the compressor impeller, wherein the cooling gas conduit is configured as a cooling gas opening extending through the compressor backplate.
7. The turbocharger assembly of claim 6, wherein the shaft is configured to rotate about a rotation axis, the cooling gas opening is elongated along an opening axis, and the opening axis is obliquely angled in relation to the rotation axis.
8. The turbocharger assembly of claim 6, further comprising a center housing coupled between the compressor assembly and the turbine wheel, wherein the compressor backplate is monolithically formed with the center housing.
9. The turbocharger assembly of claim 8, wherein the second end portion is disposed within the center housing.
10. The turbocharger assembly of claim 8, wherein the second end portion is disposed adjacent the bearing assembly such that the cooling gas conduit is configured to direct the portion of the intake gases into the bearing assembly.
11. A vehicle comprising:
an engine including an intake manifold and an exhaust manifold; and
a turbocharger assembly including:
a compressor assembly disposed in fluid communication with the intake manifold and including a compressor impeller, the compressor impeller defining a first impeller end and a second impeller end;
a turbine assembly disposed in fluid communication with the exhaust manifold and including a turbine wheel, the turbine wheel being closer to the second impeller end than to the first impeller end;
a shaft interconnecting the compressor impeller and the turbine wheel;
an air foil bearing assembly surrounding at least a portion of the shaft; and
a compressor backplate substantially covering the second impeller end, the compressor backplate defining a plurality of cooling gas openings, each cooling gas opening extending through the compressor backplate and disposed in fluid communication with the compressor assembly and the air foil bearing assembly, wherein each cooling gas opening is configured to receive a portion of intake gases flowing along the compressor impeller and direct the portion of the intake gases toward the air foil bearing assembly to cool the air foil bearing assembly.
12. The vehicle of claim 11, wherein the compressor impeller includes an outermost impeller edge and has a maximum cross-sectional dimension at the outermost impeller edge, and at least part of each cooling gas opening is disposed adjacent the outermost impeller edge.
13. The vehicle of claim 12, wherein the compressor backplate includes a plurality of inner backplate surfaces, each inner backplate surface defining at least one of the cooling gas openings.
14. The vehicle of claim 13, wherein each inner backplate surface includes a curved section disposed adjacent the outermost impeller edge, each curved section being configured to allow the portion of the intake gases to enter each cooling gas opening.
15. The vehicle of claim 14, wherein at least part of the curved section overlaps the outermost impeller edge.
16. The vehicle of claim 11, wherein at least one of the cooling gas openings is elongated along an opening axis, the shaft is configured to rotate about a rotation axis, and the opening axis is obliquely angled in relation to the rotation axis.
17. The vehicle of claim 11, further comprising a center housing coupled between the compressor assembly and the turbine assembly, wherein the compressor backplate is monolithically formed with the center housing.
18. The vehicle of claim 11, wherein at least one of the cooling gas openings is substantially cylindrical.
19. A method of cooling an air foil bearing assembly comprising:
compressing intake gases using a compressor assembly including a compressor housing, a compressor impeller located within the compressor housing, and a compressor backplate coupled to the compressor housing, the compressor impeller defining an outermost impeller edge and having a maximum cross-sectional dimension at the outermost impeller edge; and
guiding a portion of the intake gases flowing along the outermost impeller edge into the air foil bearing assembly via a cooling gas opening extending through the compressor backplate.
20. The method of claim 19, further comprising guiding the portion of the intake gases through a bearing housing of the air foil bearing assembly to cool the air foil bearing assembly.