Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2007-12-11
2007-12-11
Maung, Nay (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S258000, C375S326000, C375S324000, C375S346000, C375S316000, C375S302000, C375S304000, C375S306000
Reexamination Certificate
active
10733526
ABSTRACT:
A numerical control oscillator (NCO) for reducing a circuit size and power consumption while maintaining a desired frequency deviation, and suppressing generation of a spurious as much as possible. The NCO comprises a phase accumulator for accumulating input phase difference data to generate phase data, and a read only memory (ROM) for storing a phase/amplitude conversion table to output amplitude data corresponding to the phase data generated by the phase accumulator. The phase accumulator includes a phase register and a phase calculator. If a sampling frequency of an output signal from the NCO is Fs, the upper limit of a desired frequency setting interval of the output signal is FD and K and L are arbitrary integers, the phase calculator adds or subtracts the input phase difference data and phase data from the phase register to or from each other by a modulo operation taking the nearest integer of M as a modulus, where M=Fs/FD×K/L. The ROM has its address terminal connected to an output terminal of the phase accumulator. On the basis of the stored phase/amplitude conversion table, the ROM outputs amplitude data corresponding to phase data, input from the phase accumulator to the address terminal, through its data terminal as an output signal of the NCO set to a frequency setting interval of a dF step, where dF=FD/K×L.
REFERENCES:
patent: 4860018 (1989-08-01), Counselman, III
patent: 4870422 (1989-09-01), Counselman, III
patent: 5038120 (1991-08-01), Wheatley et al.
patent: 5202846 (1993-04-01), Rasmussen et al.
patent: 5371765 (1994-12-01), Guilford
patent: 5619535 (1997-04-01), Alvarez, Jr.
patent: 5822376 (1998-10-01), Renard
patent: 5890051 (1999-03-01), Schlang et al.
patent: 6236278 (2001-05-01), Olgaard
patent: 6463266 (2002-10-01), Shohara
patent: 6584145 (2003-06-01), Carnagna et al.
patent: 6671339 (2003-12-01), Ahn
patent: 6696886 (2004-02-01), Ke et al.
patent: 6781473 (2004-08-01), Chiu et al.
patent: 7064616 (2006-06-01), Reichert
patent: 7085309 (2006-08-01), Oesch et al.
patent: 2002/0048325 (2002-04-01), Takahiko
patent: 2004/0120425 (2004-06-01), Kishi
patent: 1355655 (2002-06-01), None
patent: 44 40 510 (1994-11-01), None
patent: 0 907 121 (1999-04-01), None
Henry T. Nicholas, III et al., “An Analysis of the Output Spectrum of Direct Digital Frequency Synthesizers in the Presence of Phase-Accumulator Truncation”, 41stAnnual Frequency Control Symposium—1987, pp. 495-502.
Jouko Vankka, “Spur Reduction Techniques in Sine Output Direct Digital Synthesis”, 1996 IEEE International Frequency Control Symposium, pp. 951-959.
European Search Report dated Mar. 16, 2004 issued in a counterpart application, namely, Appln. No. 03028172.9.
Chan Richard
Maung Nay
Samsung Electronics Co,. Ltd.
The Farrell Law Firm P.C.
LandOfFree
Numerical control oscillator, digital frequency converter... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Numerical control oscillator, digital frequency converter..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Numerical control oscillator, digital frequency converter... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3838632