Systems and method for consistent FM/HD1 diversity delay
AssigneeNautel Limited
InventorPhilipp Schmid
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Abstract
A broadcast system may have less restrictive timing constraints by providing synchronous processing chains for the HD audio portion and the FM audio portion so that no samples are added or removed from when the input audio is first sampled at an input rate and when the signals are combined and output by a digital analog converter operating at an output rate. The signals can be buffered within the synchronous processing paths and the state of the buffer can be used to control the input rate of the sampler. Graceful change over across multiple input sources can be achieved provided all input source input rates are controlled to by the overall output rate and all input sources are phase aligned to produce output symbols at the same time.
Claims21
A HD radio broadcast system comprising:
- an audio encoder comprising:
- an input sampler operating at a controllable input rate, the sampled input audio feed used to generate two audio signals for synchronous processing by respective synchronous audio processing paths;
- and
- a transmitter for transmitting two audio streams from the output of the synchronous audio processing paths over a data link;
- a transmitter exciter comprising:
- first and second modulators each for modulating respective audio streams from the two audio streams transmitted over the data link;
- an output device operating at an output rate to output a transmission signal based on a combination of the modulated two audio streams;
- and
- a buffer for the two audio streams, wherein no samples are added to or removed from the two audio streams between the input sampler and when the two streams are combined together, and wherein a state of the buffer is used to control the input rate of the audio encoder.
Dependencies are inferred from the claim text.