| 摘要 |
A spread spectrum signal receiving apparatus comprising: a radio frequency processing circuit (32) for converting a spread spectrum signal into an intermediate frequency signal; a binary encoder (35) for encoding the intermediate frequency signal; a pseudo-random noise code generator (51); a code driver (54) for controlling the phase and the chip speed of the output of the code generator; a first multiplier (36) for multiplying the binary signal by the output of the code generator; a numerical controlled oscillator (61) for outputting first and second carrier signals; second and third multipliers (62, 63) for multiplying the output signal of the first multiplier respectively by the first and second carrier signals; first and second low-pass filters (64, 65) supplied with the output signals of the second and third multipliers respectively; and a microcomputer (100) having functions (101, 102) to produce signals for controlling the numerical controlled oscillator, and functions (103-113) to produce signals for controlling the code driver. <IMAGE> <IMAGE> |
