公开(公告)号：US20210082449A1

公开(公告)日：2021-03-18

申请号：US17022423

申请日：2020-09-16

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Nicholas Luke APPLETON ,  Shanush PREMA THASARATHAN

IPC: G10L21/0224 ,  G10L19/008

Abstract: Systems, methods, and computer program products for frequency-domain estimation of latency between audio signals. In some embodiments, the estimation is performed on first blocks of data indicative of samples of a first audio signal and second blocks of data indicative of samples of a second audio signal, and includes determining a coarse latency estimate, including by determining gains which, when applied to some of the second blocks, determine estimates of one of the first blocks, and identifying one of the estimates as having a best spectral match to said one of the first blocks. A refined latency estimate is determined from the coarse estimate and some of the gains. Optionally, at least one metric indicative of confidence in the refined latency estimate is generated. Audio processing (e.g., echo cancellation) may be performed on the frequency-domain data, including by performing time alignment based on the refined latency estimate.

公开(公告)号：US20230421507A1

公开(公告)日：2023-12-28

申请号：US18252998

申请日：2021-11-17

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Shanush PREMA THASARATHAN ,  Ning WANG ,  Senaka Chandranath SAMARASEKERA

IPC: H04L47/283 ,  H04L43/106 ,  H04L41/147

CPC classification number: H04L47/283 ,  H04L43/106 ,  H04L41/147

Abstract: Embodiments are disclosed for timestamp smoothing to remove jitter. In some embodiments, a method of smoothing timestamps associated with audio packets comprises: receiving, using at least one processor, a series of input timestamps for audio packets and their respective packet lengths; estimating, using the at least one processor, an initial timestamp based on the series of input timestamps, the packet lengths and a sample time; calculating, using the at least one processor, a predicted timestamp based on the estimated initial timestamp; and smoothing, using the at least one processor, the predicted timestamp.