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Method and apparatus for auto-tuning of a radio FM-receiver

An automatic tuning and receiver technology, applied to resonant circuit components, automatic frequency control components, electrical components, etc., can solve problems such as error storage

Inactive Publication Date: 2009-09-16
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the event of sufficiently strong random interference reaching the demodulator of a radio FM receiver, it may also be incorrectly stored as it may appear within the AFC window at any time

Method used

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  • Method and apparatus for auto-tuning of a radio FM-receiver

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Embodiment Construction

[0013] In most parts of the world, the frequency band ranges from 87.5 to 108.5 MHz, and scanning of the FM band is performed with the aid of a local oscillator (L0) signal, which goes from 98, 2 to 119, sweep (swept) in the range of 2MHz. In the flowchart, this is represented by block 1 . At the beginning of each LO scan, the counter used to count positive check results is reset. Once an FM signal is received, it is checked whether this signal complies with the signal quality criteria "strength" and "AFC window". This is done in 10 iteration steps. When the counter is reset, the iteration count is also reset. The iterative procedure starts at 1 (block 3) and increments the iteration number by 1 each time the received FM signal is checked. In this example, limit the number of iterations to 10. As long as the number of iterations has not reached the value 10, as shown in block 4, the FM signal is checked for compliance with the criteria "strength" (block 5) and "AFC window...

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Abstract

In a method of auto-tuning a radio FM-receiver the receiver frequency band is scanned until a FM signal is received meeting criteria for identifying the signal as being of a predetermined quality, particularly coming from a valid FM station. At least during tuning it is permanently established whether or nor the FM signal meets the criteria, whereafter the results thereof are read a predetermined number of times, and the FM signal is only stored if at least most of these times the criteria are met. Particularly, the results are read 10 times and the FM signal is only stored if at least 8 times thereof the criteria are met.

Description

technical field [0001] The present invention relates to a method of automatically tuning a radio FM receiver by scanning the receiver frequency band until receiving an FM signal meeting criteria for identifying a signal of a predetermined quality, in particular from an active FM station Signal. Background technique [0002] One of the essential features in a broadcast receiver is the auto-tune function. This allows the user to scan the receiver frequency bands for available signals, pre-tune and store them at the push of a button. Specifically, in TV-FM, radio combination receiver TV and FM radio frequency signals are converted into baseband video and audio signals by means of such an auto-tuning function. This auto-tuning function is important, for example, for PC (Personal Computer) TV card manufacturers who want to offer computer users the possibility to enjoy broadcast TV and radio stations working on their PCs. [0003] The concept of auto-tuning for television is we...

Claims

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Application Information

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IPC IPC(8): H03J1/00H04B1/00H04B1/18
CPCH03J1/0066H03J1/0091H03J7/02
Inventor H·L·P·谭
Owner NXP BV
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