| 摘要 |
A cordless telephone handset and a cordless telephone base station both comprise a transmitter unit and a receiver unit is presented whereby the communication between said handset and said base station is established over a radio link utilizing an analogue based spread spectrum communication techniq ue whereby at the transmitter unit the analogue voice signal is sampled by mean s of a sample and hold unit, frequency modulated by means of a voltage controlled oscillator (VCO) and the spectrum of said modulated carrier signa l is spread by a mixer through a PN sequence, which is produced by a PN sequen ce generator, thereby producing a spread spectrum frequency modulated carrier signal for transmission over said radio link to the receiver unit whereby at the receiver said spread and frequency modulated carrier signal is received (1) and de-spread by means of a mixer through a PN sequence which is regenerated by means of a delay locked code tracking loop (DLL) and demodulated by means of a frequency demodulator whereby at the receiver unit the analogue voice signal (5) is finally generated by means of a hold circui t and a bans pass filter.
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