Digital phase shifter Patent #: 3997772
ApplicationNo. 06/311095 filed on 10/13/1981
US Classes:708/270, Function generation327/113, Frequency or repetition rate conversion or control708/313Decimation/interpolation
ExaminersPrimary: Shaw, Gareth D.
Assistant: Wiens, Tim A.
Attorney, Agent or Firm
International ClassH03H 17/06 (20060101)
Foreign Application Priority Data1980-10-13 JP
AbstractA sampling frequency converter for converting a first signal sampled at a first sampling frequency f1 into a second signal sampled at a second sampling frequency f2 comprising an interpolation device supplied with the first signal, for inserting L-1 zeros (L is an integer) for every sampling time, a filter circuit for attenuating a frequency component over a frequency f/2 (f is a frequency) within an output signal of said interpolation device, where the filter circuit has a series circuit consisting of a finite impulse response digital filter and an infinite impulse response digital filter, and the frequency f is equal to the first sampling frequency f1 when f1f2, and a decimation device for extracting every M-th (M is an integer) output signal of the filter circuit, to produce said second signal.