Methods and devices for improvements relating to voice quality estimation
AssigneeDolby Laboratories Licensing Corporation
InventorsDoh-Suk Kim, Shen Huang
Life of this patent
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Abstract
This disclosure falls into the field of voice communication systems, more specifically it is related to the field of voice quality estimation in a packet based voice communication system. In particular the disclosure provides a method and device for 5 reducing a prediction error of the voice quality estimation by considering the content of lost packets. Furthermore, this disclosure provides a method and device which uses a voice quality estimating algorithm to calculate the voice quality estimate based on an input which is switchable between a first and a second input mode.
Claims12
A method for modifying a statistical metric relating to lost voice packets in a packet based voice communication system, comprising the steps of:
- receiving data comprising a sequence of encoded voice packets transmitted from one or more end-points in the voice communication system, wherein encoded voice packets transmitted from the one or more end-points comprises the received sequence of encoded voice packets and one or more lost voice packets which were lost during the transmission from the one or more end-points or discarded due to latency and/or jitter in the transmission, the data comprising a signal indicating a perceptual importance of each of the encoded voice packets transmitted from the one or more end-points;
- calculating, based on the received sequence of encoded voice packets, a statistical metric relating to the lost voice packets;
- and
- modifying the statistical metric based on the perceptual importance of the lost voice packets, so as to reduce a prediction error of a voice quality estimate when using the modified statistical metric, in place of the statistical metric, as input to a voice quality estimating algorithm configured to receive and base its estimating on the statistical metric.
A device for modifying a statistical metric relating to lost voice packets in a packet based voice communication system, the device comprising:
- a receiving stage configured to receive data comprising a sequence of encoded voice packets transmitted from one or more end-points in the voice communication system, wherein encoded voice packets transmitted from the one or more end-points comprises the received sequence of encoded voice packets and one or more lost voice packets which were lost during the transmission from the one or more end-points or discarded due to latency and/or jitter in the transmission, the data comprising a signal indicating a perceptual importance of each of the encoded voice packets transmitted from the one or more end-points;
- a calculating stage configured to calculate, based on the received sequence of encoded voice packets, a statistical metric relating to a number of lost voice packets;
- and
- a perceptual transformation stage configured to modify the statistical metric based on the perceptual importance of the lost voice packets, so as to reduce a prediction error of a voice quality estimate when using the modified statistical metric as input to a voice quality estimating algorithm.
Dependencies are inferred from the claim text.