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US 5,499,267 AGranted
Spread spectrum communication system
AssigneeYamaha Corporation
InventorsIchirou Ohe, Yutaka Nakamura, Norihiro Suzuki
Life of this patent
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AssigneeYamaha Corporation
InventorsIchirou Ohe, Yutaka Nakamura, Norihiro Suzuki
Estimating the term…
A spread spectrum communication system includes a receiving section which receives a signal produced by modulating a carrier of a predetermined frequency with a spread spectrum signal which has been modulated with a spread code of a clock frequency fC and mixes the received signal with a local oscillation signal to provide a spread spectrum signal component wherein a local oscillation frequency fL of said local oscillation signal is set at fL.apprxeq.fC+fo or fL>fC+fo or fL.apprxeq.fo-fC or fL<fo-fC where fo represents frequency of said received signal. The received signal may be a signal which has been converted to an intermediate frequency signal after being received by the receiving section. The spread spectrum communication system can prevent a spread spectrum signal from being impaired due to variation in a transmission frequency or oscillation frequency in a receiving section and can thereby accurately demodulate the received signal.
A spread spectrum communication processing system for a modulated signal produced by modulating a carrier with a spread spectrum signal, the modulated signal having a frequency fo, the spread spectrum signal being modulated with a spread code, the spread code having a clock frequency fc, the spread spectrum communication processing system comprising:
A spread spectrum communication processing system for a modulated signal produced by modulating a carrier with a spread spectrum signal, the modulated signal having a frequency fo, the spread spectrum signal being modulated with a spread code, the spread spectrum code having a clock frequency fc, the spread spectrum communication processing system comprising:
A spread spectrum communication processing system for a modulated signal produced by modulating a carrier with a spread spectrum signal, the spread spectrum signal being modulated with a spread code, the spread spectrum code having a clock frequency fc, the spread spectrum communication processing system comprising:
A spread spectrum communication processing system for a modulated signal produced by modulating a carrier with a spread spectrum signal, the spread spectrum signal being modulated with a spread spectrum code, the spread spectrum code having a clock frequency fc, the spread spectrum communication processing system comprising:
A spread spectrum communication processing system for a modulated signal produced by modulating a carrier with a spread spectrum signal, the modulated signal having a center frequency fo, the spread spectrum signal being modulated with a spread code, the spread code having a clock frequency fc, the spread spectrum communication processing system comprising:
A method for processing a spread spectrum signal including a data signal generated through the use of a spread spectrum transmission technique using a pseudo random code having a clock frequency of fc, the spread spectrum signal centered around a carrier at a frequency of fo, the processing method comprising:
An apparatus for processing a spread spectrum signal including a data signal generated through the use of a spread spectrum transmission technique using a pseudo random code having a clock frequency of fc, the spread spectrum signal centered around a carrier at a frequency of fo, the processing method comprising:
A spread spectrum communication receiving system for a modulated signal produced by modulating a carrier with a spread spectrum signal, the modulated signal having a frequency fo, the spread spectrum signal being modulated with a spread code, the spread code having a clock frequency fc, the spread spectrum communication receiving system comprising:
A method for processing a spread spectrum signal including a data signal generated through the use of a spread spectrum transmission technique using a pseudo random code having a clock frequency of fc, the spread spectrum signal centered around a carrier at a frequency of fo, the processing method comprising:
Dependencies are inferred from the claim text.