Method and apparatus for baud rate detection in an FM receiver using parameters unrelated to baud rate as confirmation
AssigneeMotorola, Inc.
InventorsEdgar H. Callaway, Jr., Frederick L. Kampe
Life of this patent
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Abstract
A method for determining whether a baud rate of a frequency modulated (FM) signal received by a receiver matches a predetermined baud rate. A parameter other than the baud rate is detected and used to confirm whether baud rate detection should be made, or whether if made, is reliable. The parameter is frequency deviation of the received FM signal, or other suitable parameters of the received FM signal.
Claims19
A method for determining whether a baud rate of a frequency modulated (FM) signal received by a receiver matches a predetermined baud rate, the method comprising steps of:
- preliminarily determining whether a baud rate of the FM signal received by the receiver matches a predetermined baud rate;
- determining a parameter unrelated to the baud rate of the FM signal received by the receiver if it is preliminarily determined that its baud rate matches the predetermined baud rate;
- and
- finally determining that the baud rate of the FM signal received by the receiver matches the predetermined baud rate if said parameter satisfies a predetermined criterion.
A method for determining whether a baud rate of a frequency modulated (FM) signal received by a receiver matches a predetermined baud rate, the method comprising steps of:
- detecting a parameter unrelated to the baud rate of the FM signal received by a receiver;
- determining whether said parameter satisfies a predetermined criterion;
- and
- determining whether the baud rate of the FM signal received by the receiver matches a predetermined baud rate when the parameter satisfies a predetermined criterion.
A receiver device for receiving a frequency modulated (FM) signal detected by an antenna, the receiver comprising:
- a receiver circuit for receiving an FM signal and generating a demodulated signal;
- and
- a control module coupled to the receiver circuit and preliminarily determining whether a baud rate of the FM signal matches a predetermined baud rate, the control module determining a parameter unrelated to the baud rate if it is preliminarily determined that the baud rate of the FM signal matches the predetermined baud rate, and finally determining that the baud rate of the FM signal matches the predetermined baud rate if the parameter satisfies a predetermined criterion.
A receiver device for receiving a frequency modulated (FM) signal detected by an antenna, the receiver device comprising:
- a receiver circuit for demodulating a received FM signal and generating a demodulated signal;
- and
- a control module coupled to the receiver circuit for preliminarily determining a parameter unrelated to a baud rate of the received FM signal and determining whether the parameter satisfies a predetermined criterion, and when the parameter satisfies the predetermined criterion the control module determining whether the baud rate of the received FM signal matches a predetermined baud rate.
Dependencies are inferred from the claim text.