H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/58
H04B 1/04 (2006.01) G06F 1/02 (2006.01) H04L 27/20 (2006.01)
Patent
CA 1238366
PHN 11.101 147 5.4.1985 ABSTRACT: "Arrangement for generating an angle-modulated carrier signal of a constant amplitude in response to data sig- nals". An arrangement for generating an angle-modulated carrier signal of a constant amplitude and continuous phase ?(t) comprises a control circuit which in response to a given number of consecutive data symbols of symbol frequency 1/T produces addresses at a clock frequency 4q/T, where q is an integer greater than 1, and further produces phase state numbers for characterizing the value modulo-2.pi. of ?(t) at the boundaries of the symbol inter- vals. Connected to the control circuit is a signal pro- cessor comprising a read-only memory for storing values representing cos ?(t) and sin ?(t) at the clock in- stants, which values are processed after reading to form the analog angle-modulated signal. An arrangement having a comparatively small ca- pacity of the read-only memory is obtained by providing that storage in this read-only memory is only effected for non-decreasing phases ?(t) and one of the phase state numbers, that the control circuit comprises an address con- verter for producing addresses corresponding to this storage and a generator for producing a first and a se- eond selection signal in response to the phase state num- ber, and that the signal processor is arranged for selec- tively applying at each clock instant in response to the first selection signal only one of the two values repre- senting cos ?(t) and sin ?(t) to a DAC-circuit and for selectively inverting at each clock instant in response to the second selection signal the sign of the output sample of the DAC-circuit, these output samples constituting the samples of the analog angle-modulated carrier signal having a carrier frequency q/T, whereby the modulated carrier signal can be derived from these output samples with the aid of a bandpass filter.
487085
Chung Kah-Seng
Verstappen Hendrikus L.
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
LandOfFree
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