Claims
- 1. A signal processing system for converting a variable frequency input signal to a fixed frequency output signal comprising:
means for generating a first clock signal at a first clock frequency; means for receiving a frequency control signal that corresponds to a second frequency; means for generating a second clock signal at the second frequency as a function of said frequency control signal; means for generating a phase offset signal representing an offset in phase between the first clock signal and the second clock signal; and means for converting a variable frequency input signal to an interpolated signal at a fixed sampling frequency in accordance with said phase offset signal.
- 2. The signal processing system of claim 1 further comprising:
means for modulating the interpolated signal onto trigonometric signals; and means for converting the modulated signal to an analog signal.
- 3. The signal processing system of claim 1 wherein the means for converting a variable frequency input signal to an interpolated signal at a fixed sampling frequency in accordance with said phase offset signal comprises an interpolator that interpolates the the variable frequency input signal by a non-integer value.
- 4. The signal processing system of claim 1 wherein the means for converting a variable frequency input signal to an interpolated signal at a fixed sampling frequency in accordance with said phase offset signal comprises an interpolator that interpolates the the variable frequency input signal by an integer value.
- 5. A signal processing system for converting a variable frequency input signal to an output signal having a fixed output frequency, comprising:
means for generating a clock signal at a clock frequency equal to baud rate of said variable frequency input signal as a function of a frequency control signal; means for generating a phase offset signal representing an offset in phase between a recipient clock signal and the clock signal; and means for converting a variable frequency input signal to an interpolated signal at a fixed sampling frequency in accordance with said phase offset signal.
- 6. A signal processing system, comprising:
means for providing a first clock signal at a first clock frequency; oscillator means, responsive to a frequency control signal and the first clock signal for providing an output clock signal at a fixed second clock frequency and a phase offset signal representing an offset in phase between the first clock signal and the second clock signal, and interpolation means for offseting a pair of variable frequency input signals in accordance with the phase offset signal to provide an interpolated signal at a fixed output sampling frequency.
- 7. The signal processing system of claim 6 wherein the phase offset signal is greater than or equal to zero and less than one.
- 8. The signal processing system of claim 6 wherein the interpolatiopn means interpolates the variable frequency input signal by a non-integer value.
- 9. The signal processing system of claim 6 wherein the interpolation means interpolates the variable frequency input signal by an integer value.
- 10. The signal processing system of claim 6 further comprising a modulator for modulating the interpolated signal onto a trigonometric signal at a carrier frequency.
- 11. The signal processing system of claim 10 further comprising a digital to analog converter for converting the modulated signal to an analog signal.
- 12. The signal processing system of claim 6 wherein said interpolation means includes a register, responsive to said second clock signal, to provide said pair of variable frequency input signals.
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application is a continuation of allowed application Ser. No. 10/272,759 filed Oct. 17, 2002, which is a continuation of U.S. Pat. No. 6,498,823, issued Dec. 24, 2002, which is a continuation of U.S. Pat. No. 6,144,712, issued Nov. 7, 2000.
[0002] This application contains subject matter that is related to U.S. Pat. No. 6,421,396, issued Jul. 16, 2002.
Continuations (3)
|
Number |
Date |
Country |
Parent |
10272759 |
Oct 2002 |
US |
Child |
10646971 |
Aug 2003 |
US |
Parent |
09570238 |
May 2000 |
US |
Child |
10272759 |
Oct 2002 |
US |
Parent |
08948101 |
Oct 1997 |
US |
Child |
09570238 |
May 2000 |
US |