Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2006-11-28
2006-11-28
Ngo, Chuong D. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
07143125
ABSTRACT:
A direct digital synthesizer (30) with noise shaping circuitry can comprise a ROM-less direct digital synthesizer having a quantizer (40) and a noise shaping loop incorporating the quantizer for shaping a quantization noise due to noise from the quantizer. The noise shaping loop can comprise a noise shaping filter (44) and the noise shaping loop can feed back to the noise shaping filter a difference between an input signal (49) to the quantizer and an output signal (43) from the quantizer. The ROM-less direct digital synthesizer can further include a dither (39) combined at an input of the quantizer.
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Gradishar Thomas L.
Stengel Robert
Motorola Inc.
Ngo Chuong D.
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