Method for separating a RDS signal component and signal receiver
AssigneeSony Deutschland GmbH
InventorJens Wildhagen
Life of this patent
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Abstract
A signal receiver and a method for separating a RDS signal component from a received signal is described. After the received signal has been downconverted to the baseband, the baseband signal is split up into a first baseband signal for a first signal path and a second baseband signal for a second signal path. The first baseband signal is highpass filtered and forwarded to a frequency synchronization unit that generates a frequency synchronization carrier. The second baseband signal is modified in accordance with the frequency synchronization carrier provided by the first signal path, and a synchronized baseband signal is obtained that still comprises the full range of the RDS signal's spectral components.
Claims24
Signal receiver adapted for receiving a signal comprising a RDS signal component,
- characterized by
- a downconversion unit (19) for converting a received signal (18) to a baseband signal (21);
- a first signal path (24) for said baseband signal, with said first signal path (24) comprising a first highpass filter unit (27) that filters said baseband signal and generates a highpass filtered signal (28), and a frequency synchronization unit (29) that derives, from said highpass filtered signal (28), a frequency synchronization carrier signal (30);
- a second signal path (26) for said baseband signal, whereby in said second signal path (26), the baseband signal's frequency is modified in accordance with said frequency synchronization carrier signal (30) to obtain a synchronized baseband signal (34).
Signal receiver according to any of the preceding claims,
- characterized by
- a matched filter for suppressing out-of-band frequency components of said baseband signal.
Signal receiver according to any of the preceding claims,
- characterized in that
- said frequency synchronization unit is implemented as a frequency synchronization loop, and preferably as a COSTAS loop.
Signal receiver according to any of the preceding claims,
- characterized in that
- said second signal path comprises a mixing unit for multiplying said baseband signal with said frequency synchronization carrier signal to obtain said synchronized baseband signal.
Signal receiver according to any of the preceding claims,
- characterized in that
- said second signal path comprises a second highpass filter unit, whereby the cut-off frequency of said second highpass filter unit is adapted for suppressing at least a DC component of said baseband signal.
Signal receiver according to any of the preceding claims,
- characterized by
- an extraction unit that separates the inphase signal component from the synchronized baseband signal.
Signal receiver according to any of the preceding claims,
- characterized by
- a time synchronization unit for sampling a signal component of said synchronized baseband signal, and for providing a digitised signal component.
Signal receiver according to any of the preceding claims,
- characterized by
- a data decoder for decoding a digitised signal component to obtain a RDS signal.
Method for separating a RDS signal component from a received signal (18) comprising a RDS signal component,
- characterized by
- the following steps:
- converting said received signal (18) into a baseband signal (21);
- splitting up said baseband signal (21) into a first baseband signal (23) for a first signal path (24) and a second baseband signal (25) for a second signal path (26);
- performing a first highpass filtering operation of said first baseband signal (23) in order to generate a highpass filtered signal (28), whereby low-frequency components of said first baseband signal (23) are removed;
- deriving, from said highpass filtered signal (28), a frequency synchronization carrier signal (30);
- modifying said second baseband signal's frequency in accordance with said frequency synchronization carrier signal (30) to obtain a synchronized baseband signal (34).
Dependencies are inferred from the claim text.