RECEIVER AND RECEIVING SYSTEM USING THE SAME
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Accused Products
Abstract
If receiving circuit is in a high-sensitivity mode, receiving circuit is switched to a low-sensitivity mode when the BER according to BER measurement circuit becomes more favorable than a release threshold. If receiving circuit is in the low-sensitivity mode, receiving circuit is switched to the high-sensitivity mode when the BER according to BER measurement circuit becomes more adverse than a start-up threshold. If switching between the high-sensitivity and low-sensitivity modes occurs, control is exercised so that switching from the high-sensitivity mode to the low is resistant to occurring, thereby suppressing the occurrence of a reception error caused by switching between the receiving modes.
95 Citations
50 Claims
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1-25. -25. (canceled)
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26. A receiving apparatus comprising:
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a receiving circuit having a high-sensitivity mode and a low-sensitivity mode with sensitivity lower than the high-sensitivity mode; a reception quality judging circuit judging reception quality of a reception signal output from the receiving circuit; and a control circuit controlling switching between the high-sensitivity mode and the low-sensitivity mode according to a signal from the reception quality judging circuit, wherein, if the receiving circuit is in the high-sensitivity mode, the control circuit switches the receiving circuit to the low-sensitivity mode when a judgement result according to the reception quality judging circuit becomes more favorable than a release threshold; and if the receiving circuit is in the low-sensitivity mode, the control circuit switches the receiving circuit to the high-sensitivity mode when a judgement result according to the reception quality judging circuit becomes more adverse than a start-up threshold, and wherein, if switching between the high-sensitivity mode and the low-sensitivity mode occurs, the control circuit exercises control so that switching from the high-sensitivity mode to the low-sensitivity mode is difficult. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
wherein the high-sensitivity mode is a mode in which the selecting or combining circuit performs reception using the first receiving circuit and the second receiving circuit; and wherein the low-sensitivity mode is a mode in which the selecting or combining circuit performs reception using either one of the first receiving circuit and the second receiving circuit.
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31. The receiving apparatus of claim 27,
wherein the receiving unit includes a first receiving circuit, a second receiving circuit, and a selecting or combining unit connected to an output side of the first receiving circuit and an output side of the second receiving circuit; -
wherein the high-sensitivity mode is a mode in which the selecting or combining unit performs reception using the first receiving circuit and the second receiving circuit; and wherein the low-sensitivity mode is a mode in which the selecting or combining unit performs reception using either one of the first receiving circuit and the second receiving circuit.
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32. The receiving apparatus of claim 28,
wherein the receiving unit includes a first receiving circuit, a second receiving circuit, and a selecting or combining unit connected to an output side of the first receiving circuit and an output side of the second receiving circuit; -
wherein the high-sensitivity mode is a mode in which the selecting or combining unit performs reception using the first receiving circuit and the second receiving circuit; and wherein the low-sensitivity mode is a mode in which the selecting or combining unit performs reception using either one of the first receiving circuit and the second receiving circuit.
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33. The receiving apparatus of claim 29,
wherein the receiving unit includes a first receiving circuit, a second receiving circuit, and a selecting or combining unit connected to an output side of the first receiving circuit and an output side of the second receiving circuit; -
wherein the high-sensitivity mode is a mode in which the selecting or combining unit performs reception using the first receiving circuit and the second receiving circuit; and wherein the low-sensitivity mode is a mode in which the selecting or combining unit performs reception using either one of the first receiving circuit and the second receiving circuit.
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34. The receiving apparatus of claim 26, wherein the low-sensitivity mode is implemented by restricting a current inside the receiving unit in the high-sensitivity mode.
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35. The receiving apparatus of claim 27, wherein the low-sensitivity mode is implemented by restricting a current inside the receiving unit in the high-sensitivity mode.
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36. The receiving apparatus of claim 28, wherein the low-sensitivity mode is implemented by restricting a current inside the receiving unit in the high-sensitivity mode.
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37. The receiving apparatus of claim 29, wherein the low-sensitivity mode is implemented by restricting a current inside the receiving unit in the high-sensitivity mode.
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38. The receiving apparatus of claim 28, wherein the low-sensitivity mode is implemented by decreasing the number of stages of an IF filter inside the receiving unit in the high-sensitivity mode.
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39. The receiving apparatus of claim 26, wherein the control circuit returns the release threshold to an initial value if a state in which a judgement result according to the reception quality judging circuit is more favorable than the release threshold continues for a given time.
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40. The receiving apparatus of claim 28, wherein the control circuit returns the release threshold to an initial value if a state in which a judgement result according to the reception quality judging circuit is more favorable than the release threshold continues for a given time.
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41. The receiving apparatus of claim 28, wherein the reception quality judging circuit judges reception quality using an error rate of a reception signal.
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42. The receiving apparatus of claim 29, wherein the reception quality judging circuit judges reception quality using an error rate of a reception signal.
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43. The receiving apparatus of claim 28, wherein the reception quality judging circuit judges reception quality using a C/N ratio of a reception signal.
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44. The receiving apparatus of claim 29, wherein the reception quality judging circuit judges reception quality using a C/N ratio of a reception signal.
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45. The receiving apparatus of claim 28, wherein the reception quality judging circuit judges reception quality using a reception level of a reception signal.
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46. The receiving apparatus of claim 29, wherein the reception quality judging circuit judges reception quality using a reception level of a reception signal.
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47. A receiving system comprising a decoding unit sequentially connected to the receiving apparatus of claim 26 and to an output side of the receiving apparatus, and a display unit.
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48. A receiving system comprising a decoding unit sequentially connected to the receiving apparatus of claim 27 and to an output side of the receiving apparatus, and a display unit.
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49. A receiving system comprising a decoding unit sequentially connected to the receiving apparatus of claim 28 and to an output side of the receiving apparatus, and a display unit.
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50. A receiving system comprising a decoding unit sequentially connected to the receiving apparatus of claim 29 and to an output side of the receiving apparatus, and a display unit.
Specification