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Television receiver

a receiver and receiver technology, applied in the field of television receivers, can solve problems such as extended dead periods for the entire system

Inactive Publication Date: 2007-09-27
HARMAN BECKER AUTOMOTIVE SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a television receiver with a tuner, selective filter stage, intermediate-frequency stage, and field-strength-detection stage. The field-strength-detection stage generates a field strength signal and a control signal based on the field strength. The selective filter stage modifies its transfer function based on the control signal. The invention allows for improved signal quality and better control over the received signal.

Problems solved by technology

This response is essentially caused by the unlocking of the phase-locked loops (PLL) for video signal processing, by unsteady synchronous pulse, separation, by disturbed automatic gain controls (AGC), and defective color subcarrier recovery.
In addition, a loss of lock causes an extended dead period for the entire system, since each phase-locked loop requires a certain period of time to return to a new lock-in state.

Method used

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Experimental program
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Embodiment Construction

[0015]FIG. 1 is a schematic block diagram of a mobile television receiver 100. A high-frequency (HF) signal is received by an antenna 1, which provides a received signal to a tuner 2. The tuner provides an intermediate-frequency (IF) signal, for example, by mixing the received signal with a carrier signal. The sensitivity of the tuner 2 is determined by an automatic gain control (AGC) signal.

[0016] The IF signal is input to a selective filter 3 that filters the IF signal and provides a filtered signal on a line 14 to an intermediate-frequency stage 4, which generates an FBAS color signal. Significantly, the transfer function of the selective filter 3 can be modified by a control signal TS on a line 16. The control signal AGC and the control signal TS are derived from a field strength signal generated in a field-strength-detection stage 9.

[0017] Typically, the field strength signal generated by the field-strength detection stage 9 is proportional to the field strength of the HF sig...

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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.

Description

PRIORITY INFORMATION [0001] This application is a continuation of co-pending Ser. No. 10 / 073,817 filed Feb. 11, 2002.BACKGROUND OF THE INVENTION [0002] The present invention relates generally to a television receiver, and in particular to a mobile television receiver. [0003] Unlike stationary television receivers, mobile television receivers encounter constantly changing reception conditions. For example, when a mobile television receiver is installed in a vehicle, the position of the antenna changes with the position of the vehicle. In contrast to an antenna of a stationary television receiver which can be optimally aligned and fixed once, a mobile television receiver and its antenna will be located in many positions relative to the transmitter, resulting in a continually changing reception. For this reason, during the development of mobile television receivers, special attention has been paid to the response of the television receiver given low levels of reception. [0004] A low le...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/50H03J3/24H04B1/10
CPCH03J3/24
Inventor ZAHM, MICHAELGEIGER, ERICH
Owner HARMAN BECKER AUTOMOTIVE SYST