Television receiver

• US 20070222899A1
• Filed: 11/13/2006
• Published: 09/27/2007
• Est. Priority Date: 02/09/2001
• Status: Abandoned Application

• Current Assignee: Harman Becker Automotive Systems GmbH (Samsung Electronics Co. Ltd.)
• Original Assignee: Harman Becker Automotive Systems GmbH (Samsung Electronics Co. Ltd.)
• Inventors: Geiger, Erich, Zahm, Michael
• Application Number:
  US11/598,558
• Publication Number:
  US 20070222899A1
• Time in Patent Office: Days
• US Class Current: 348/731
• CPC Class Codes: H03J 3/24 of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning

Abstract

A television receiver includes a tuner stage, a selective filter stage connected to the tuner stage, and a intermediate-frequency stage connected to the selective filter stage. A field-strength-detection stage is also provided, which generates a field strength signal proportional to the field strength of the received signal. The selective filter stage includes a transfer function that is modifiable by a control signal derived from the field strength signal.

Claims

1. A television receiver comprising:

a tuner that receives a transmitted signal from an antenna;

a selective filter stage connected to the tuner;

an intermediate-frequency stage connected to the selective filter stage; and

at least one field-strength-detection stage that generates a field strength signal proportional to the field strength of the received signal, and which generates a control signal derived from the field strength signal, where the selective filter stage implements a transfer function that is modifiable by the control signal.

2. The television receiver of claim 1, where the bandwidth of the selective filter stage is modified as a function of the control signal.

3. The television receiver of claim 1, where the selective filter stage is implemented as a frequency trap, the slope of which is modifiable by the control signal.

5. The television receiver of claim 1, where a black-and-white signal is contained in the received signal and, in response to a low field strength signal, only black-and-white signals are transmitted by the selective filter stage.

6. The television receiver of claim 5, where the received signal includes a video signal, and where a video signal is contained in the video signal and, in response to a low field strength signal, higher-frequency video signals are suppressed by the selective filter stage.

7. The television receiver of claim 1, where the selective filter stage is controlled such that given a field strength signal above a certain threshold value there is no effect on the signal by the selective filter stage.

8. The television receiver of claim 1, where in response to a degrading signal, the selective filter stage adapts the filter response continually or in steps.

9. The television receiver of claim 1, where the at least one field-strength-detection stage evaluates the received signal and generates the field strength signal.

10. The television receiver of claim 1, where the at least one field-strength-detection stage comprises the intermediate-frequency stage, where the intermediate-frequency stage generates the field strength signal.

13. The television receiver of claim 1, where the television receiver further comprises a second selective filter stage connected to the intermediate-frequency stage, the second selective filter stage being controlled by at least one of the one or more control signal.

14. The television receiver of claim 13, where at least one of the first and second selective filter stages implements a frequency trap having a slope that is modifiable in response to the one or more control signals.

15. The television receiver of claim 14, where one chrominance signal and one luminance signal are contained in the received signal, and where the frequency trap is dimensioned such that, in response to a higher field strength signal, spectral components of the chrominance signal are more strongly suppressed, while in response to a lower field strength signal noise signals in the spectral range of luminance and chrominance signal are reduced.

16. The television receiver of claim 13, where a black-and-white signal is contained in the received signal and, in response to a low field strength signal, only black-and-white signals are transmitted by the first and second selective filter stages.

17. The television receiver according to claim 13, where the received signal comprises a video signal, and where, in response to a low field strength signal, higher-frequency video signals are suppressed by one or more of the first and second selective filter stages.

18. The television receiver according to claim 13, where in response to a degrading signal the first and second selective filter stages implement respective filter response one of either continually and in increments.

19. The television receiver of claim 13, where the television receiver further comprises at least one additional signal-processing stage connected to and following the intermediate-frequency stage, where at least one of the one or more control signals is derived from at least one signal from the at least one additional signal-processing stage.

4. The television receiver of claim 4, where one chrominance signal and one luminance signal are contained in the received signal and where the frequency trap is dimensioned such that, in response to a higher field strength signal, spectral components of the chrominance signal are more strongly suppressed, while in response to a lower field strength signal noise signals in the spectral range of luminance and chrominance signal are reduced.

24. The television receiver of claim 4, further comprising at least one additional selective filter means connected to the intermediate-frequency stage, the additional selective filter means responsive to the control signal.

11. A television receiver comprising:

a tuner that receives a transmitted signal from an antenna;

a first selective filter stage connected to the tuner, the selective filter stage implementing a transfer function that is modifiable by one or more control signals derived from a field strength signal; and

an intermediate-frequency stage connected to the selective filter stage and generating a first control signal of the one or more control signals.

12. The television receiver of claim 11, where the first selective filter stage modifies the bandwidth of the implemented transfer function based on the one or more control signals.

20. A television receiver comprising:

a tuner that receives a transmitted signal from an antenna;

first selective filter means, connected to the tuner, for implementing a transfer function modifiable in response to one or more control signals; and

means for generating the control signal derived from a detected field strength of the received signal.

21. The television receiver of claim 20, where the transfer function comprises a bandwidth modifiable in response to the one or more control signals.

22. The television receiver of claim 20, where the means for generating a control signal derived from a detected field strength comprises an intermediate-frequency stage connected to the selective filter means.

23. The television receiver of claim 20, where the means for generating a control signal derived from a detected field strength comprises a field strength detector connected to receive one of either an input to or an output from the tuner.