Title:
METHOD AND APPARATUS FOR FORMING A PULSE AMPLITUDE MODULATED SIGNAL
Document Type and Number:
WIPO Patent Application WO1995032550
Kind Code:
A3
Abstract:
PCT No. PCT/FI95/00268 Sec. 371 Date Nov. 20, 1996 Sec. 102(e) Date Nov. 20, 1996 PCT Filed May 18, 1995 PCT Pub. No. WO95/32550 PCT Pub. Date Nov. 30, 1995A method and an apparatus for forming a pulse amplitude modulated signal in association with digital modulation. In the method symbols to be transmitted are formed from bits of an incoming bit stream. In order to achieve an accurate timing even when a bit clock contains abundant jitter, sample values of a pre-low-pass-filtered waveform of a pulse to be transmitted, covering at least one symbol period, are stored in a memory, sample values are read from the memory at the rate of a constant-frequency clock signal (fc, 4xfc), and a sample value read from the memory is multiplied by a predetermined factor the value of which is formed as a response to the symbol being transmitted.
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Inventors:
LINDHOLM JARI (FI)
Application Number:
PCT/FI1995/000268
Publication Date:
December 28, 1995
Filing Date:
May 18, 1995
Export Citation:
Assignee:
NOKIA TELECOMMUNICATIONS OY (FI)
LINDHOLM JARI (FI)
LINDHOLM JARI (FI)
International Classes:
G06F1/03; H03K7/02; (IPC1-7): H03K7/02
Foreign References:
| EP0078857A1 | 1983-05-18 | |||
| US4992743A | 1991-02-12 | |||
| DE4404004A1 | 1994-11-24 |
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