Method for interference-free frequency change in a receiving system with a plurality of parallel operated recevers

Inactive Publication Date: 2008-04-17
ATMEL GERMANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0010] It is therefore an object of the present invention to provide a method and a receiving system with which the interfering inter

Problems solved by technology

Thus, for example, the building up of the audio receiver to a new receive frequency can interfere with the reception of the background receiver and vice versa.
It is problematic in this case that local oscillators of the dif

Method used

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Example

[0054] A first embodiment of a method for frequency change will be illustrated hereinafter with reference to FIG. 3 and FIGS. 1 and 2. In FIG. 3a, the frequency f of the output signal of first local oscillator 60 is shown versus time t. FIG. 3c illustrates an activity state changing between a turned on state “on” and a turned off state “off” of first local oscillator 60, and FIG. 3b illustrates qualitatively amplitudes and frequencies of its output signal during a frequency change.

[0055] Until time t1, first local oscillator 60 is turned on (compare FIG. 3c, “on”) and accordingly supplies a signal of frequency F1 and a predefined amplitude to first mixer 26 (compare FIG. 3b). The period duration of its output signal is thereby 1 / F1. Frequency F1 is thereby stabilized by a closed loop from control value generator 80 of first frequency control element 66 and first local oscillator 60.

[0056] For the most interference-free change possible in the frequency of first local oscillator 60 f

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Abstract

A method is presented for changing a frequency of a first local oscillator in a receiving system, which has a first receiver with the first local oscillator and a first frequency control element and a second receiver with a second local oscillator and a second frequency control element. The method is characterized in that the following steps are performed during a change in a frequency of the first local oscillator from an actual frequency of the first local oscillator to a target frequency, at which an actual frequency of the second local oscillator lies between the actual frequency of the first local oscillator and the target frequency: turning off the first local oscillator, control of the first frequency control element such that the first frequency control element provides a first base value, assigned to the target frequency, of a frequency control variable, turning on the first local oscillator, and setting of the frequency of the first local oscillator to the target frequency. Furthermore, a receiving system is presented.

Description

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Claims

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Application Information

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Owner ATMEL GERMANY
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