Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2007-07-17
2007-07-17
Payne, David C. (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
Reexamination Certificate
active
10514986
ABSTRACT:
Receiving antennas2a, 2breceive a digital modulated signal from a digital wireless microphone. The digital modulated signal comprises a carrier signal modulated with successively generated digital signal trains. A changeover switch4selects one of the antennas2a, 2bin response to a selection signal. A high-frequency unit8, a demodulating unit10and a decoding unit12receive and demodulate the digital modulated signal received by the selected antenna. Analog comparators24a, 24bcompare a reception level indicative signal from the high-frequency unit8with threshold values, and a diversity judging unit28changes the selection signal in accordance with the comparison result. The digital signal trains comprise a plurality of successive frames, and each frame includes an information data section, a preamble section preceding the information data section for establishing synchronization of the information data section, and a guard bit section succeeding the information data section. Each time the guard bit section is received, the selection signal is changed and the antenna selection is performed.
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Duane Morris LLP
Guarino Rahel
Payne David C.
TOA Corporation
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