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US 12,183,356 B2Granted
Digital encapsulation of audio signals
AssigneeLenbrook Industries Limited
InventorsPeter Graham Craven, John Robert Stuart
Life of this patent
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Abstract
Encoding and decoding systems are described for the provision of high quality digital representations of audio signals with particular attention to the correct perceptual rendering of fast transients at modest sample rates. This is achieved by optimising downsampling and upsampling filters to minimise the length of the impulse response while adequately attenuating alias products that have been found perceptually harmful.
Claims6
An encoder adapted to furnish a digital audio signal at a transmission sample rate from a signal representing an audio capture, the encoder comprising:
- a downsampler that comprises a downsampling filter coupled with a decimator, the downsampling filter having a frequency response having a double zero at each frequency of the digital audio signal that will alias to zero frequency and having a slope at the Nyquist frequency of the transmission sample rate that is more positive than minus thirteen decibels per octave.
Dependencies are inferred from the claim text.