Tuner arrangement

A tuner, harmonic technology used in demodulation, modulation transfer, discontinuous tuning with variable tuning elements, etc.

Inactive Publication Date: 2005-11-23
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technique IS specifically concerned with spurs formed in the passband of the first intermediate frequency (IF) filter, but only discloses changing the second oscillator frequency such that when an offset is required to avoid spurs, the second IF will also change

Method used

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Embodiment Construction

[0038] Although the tuner device shown in FIG. 1 is a dual-tuner type in which each tuner is a double-conversion type, this is for illustration only. The present technology can be applied to a tuner device including a single tuner with two or more frequency conversion stages. Furthermore, the invention can be applied to a device comprising any number of tuners, each of which has two or more conversion stages, and can have the same number or a different number of conversion stages. Also, although the tuner shown in Figure 1 provides a standard output TV IF, these techniques can be applied to tuners that provide any output frequency, including zero-IF (ZIF), near-zero-IF (NZIF), low-IF, and high-mid frequency. These tuners can be used to receive signals distributed by cable distribution systems or terrestrial or satellite broadcast systems.

[0039] The tuners forming the device shown in Figure 1 have substantially the same structure and operation and comprise radio frequency (...

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Abstract

A tuner arrangement is provided comprising one or more tuners. Each tuner has two or more frequency changers, each comprising a mixer and a local oscillator. A controller controls the local oscillators in response to receipt of a channel select request. The controller determines the nominal frequencies of the local oscillators for tuning the selected channel and then performs a calculation to determine whether any beat frequencies between harmonics greater than the first harmonic of the local oscillators lie within the frequency band at the tuner output occupied by the selected channel. If so, the controller shifts the local oscillator frequencies so as to move the potentially interfering products outside the utilised band and then tunes the local oscillators appropriately.

Description

technical field [0001] The invention relates to tuner devices. For example, such a tuner device may be used to selectively receive signals such as television, audio or data signals distributed by cable systems or broadcast by terrestrial or satellite systems. Background technique [0002] It is known that tuners having two or more frequency converters suffer from the generation of spurious heterodyne products that occur within the frequency band of the output signal and originate from the spurious nonlinear mixing of the two or more local oscillator signals. For example, one known type of double-conversion tuner includes a first up-converter for converting the frequency of any selected channel to a high first intermediate frequency, such as 1220 MHz, by high-side mixing, i.e. the first frequency converter The local oscillator is at a frequency higher than the frequency of the selected channel. Then, in the second frequency converter, the channel at the high-medium frequenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16H03J1/00H03J5/02H04B1/18H04H1/00H04H40/18
CPCH04H40/18H03J1/0083H03D7/161
Inventor 尼古拉斯·保罗·考利特里·爱立维尔
Owner INTEL CORP
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