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1. (US20060205372) Agc circuit arrangement for a tuner
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims

1. An apparatus comprising:
an input receiving a first signal;
a first signal path for integrating the difference between the first signal and a first reference level to produce a first control signal; and
a second signal path for integrating the difference between the first control signal and a second reference level to produce a second control signal.
2. The apparatus of claim 1 wherein the second reference level is an AGC delay point.
3. The apparatus of claim 1 wherein the first signal is an intermediate frequency signal from a tuner.
4. The apparatus of claim 1 wherein the first control signal and the second control signal control a first gain controllable amplifier and a second gain controllable amplifier in a tuner.
5. The apparatus of claim 1 wherein the integrating the difference between the first signal and a first reference level to produce a first control signal and the integrating the difference between the first control signal and a second reference level to produce a second control signal are performed by software.
6. The apparatus of claim 1 wherein the integrating the difference between the first signal and a first reference level to produce a first control signal and the integrating the difference between the first control signal and a second reference level to produce a second control signal are performed by hardware.
7. The apparatus of claim 1 wherein the integrating the difference between the first signal and a first reference level to produce a first control signal and the integrating the difference between the first control signal and a second reference level to produce a second control signal are performed internal to an integrated circuit.
8. A method comprising to steps of:
determining a first control value by integrating the difference between a signal level and a first reference level; and
determining a second control value by integrating the difference between the first control signal and a second reference level.
9. The method of claim 8 wherein the second reference level is an AGC delay point.
10. The method of claim 8 wherein the signal level is the RMS value of an input signal.
11. The method of claim 8 wherein the integrating the difference between the signal level and a first reference level and the integrating the difference between the first control signal and a second reference level are performed by hardware implemented in a digital integrated circuit.
12. The method of claim 8 wherein the integrating the difference between the signal level and a first reference level and the integrating the difference between the first control signal and a second reference level are performed by software.
13. The method of claim 8 wherein the first control value and the second control value control a first gain controllable amplifier and a second gain controllable amplifier in a tuner.
14. A gain control method comprising to steps of: converting an analog signal to a digital signal;
integrating the difference between a predetermined characteristic of said digital signal and a first reference level to produce a first control signal; and
integrating the difference between a predetermined characteristic of said first control signal and a second reference level to produce a second control signal.
15. The gain control method of claim 14 wherein the second reference level is an AGC delay point.
16. The gain control method of claim 14 wherein the predetermined characteristic of the digital signal is the RMS value.
17. The gain control method of claim 14 wherein the method is performed by hardware implemented in a digital integrated circuit.
18. The gain control method of claim 14 wherein the method is performed by software.
19. The gain control method of claim 14 wherein the first control signal and the second control value control a first gain controllable amplifier and a second gain controllable amplifier in a tuner.