Digital Signal Quality Metric For AM HD Radio Signal
AssigneeiBiquity Digital Corporation
InventorsJeffrey S. Baird, Paul Peyla
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Abstract
Generally described herein are various embodiments of an amplitude modulated (AM) radio Digital Signal Quality Metric (DSQM) system and method for allowing an HD Radio™ receiver to quickly ascertain whether an AM radio broadcast signal is present on an AM broadcast station. Moreover, embodiments of the AM DSQM system and method measure the quality of the AM broadcast signal. In some embodiments, the system and method indicate the quality of the AM digital signal with a range from 0 to 1, with “0” meaning a threshold for listenability and a “1” meaning highest quality for listenable audio. One embodiment also quickly identifies the Service Mode of an AM signal and computes a carrier-to-noise ratio (C/No).
Claims20
A system for computing a Digital Signal Quality Metric (DSQM) for an amplitude modulated (AM) in-band on-channel radio receiver, the system comprising:
- memory;
- one or more processors;
- a radio receiver configured to perform:
- receiving an input signal;
- estimating a signal-to-noise ratio (SNR) of the input signal;
- and
- computing an output, the output comprising at least one of a digital signal quality metric (DSQM), a service mode or a carrier-to-noise ratio (C/No).
A method for computing a Digital Signal Quality Metric (DSQM) for an AM in-band on-channel radio receiver, the method comprising:
- receiving an input signal;
- estimating a signal-to-noise ratio (SNR) of the input signal;
- and
- computing at least one of a digital signal quality metric (DSQM), a service mode and a carrier-to-noise ratio (C/No).
A non-transitory machine-readable medium comprising machine-readable instructions encoded thereon for performing a method of computing a Digital Signal Quality Metric (DSQM) for an amplitude modulated (AM) in-band on-channel radio receiver, the method comprising:
- receiving an input signal;
- estimating a signal-to-noise ratio (SNR) of the input signal;
- and
- computing at least one of a digital signal quality metric (DSQM), a service mode and a carrier-to-noise ratio (C/No).
Dependencies are inferred from the claim text.