公开(公告)号：US10120641B2

公开(公告)日：2018-11-06

申请号：US15678083

申请日：2017-08-15

Applicant: EVA Automation, Inc.

Inventor： Leo Lay ,  Adrian Harold Chadd ,  Haisong Wang ,  Shiwei Zhao ,  Li Li ,  Gaylord Yu

IPC: G06F17/00 ,  G06F3/16 ,  H04R27/00 ,  H04L7/00 ,  H04L7/033 ,  H04H60/80 ,  H04L29/06 ,  H04M1/725 ,  H04N21/233 ,  H04N21/81 ,  H04N21/43 ,  H04R3/12

Abstract: A processor in an electronic device maintains coordination between a system clock provided by a system clock circuit and an interface clock provided by a clock circuit. Then, the processor may calculate, based on differences between transmit times when packets were transmitted by a second electronic device and receive times of the packets, relative drift as a function of time between the interface clock and a second interface clock in the second electronic device. Moreover, the processor adjusts, based on the relative drift, the system clock circuit to eliminate the relative drift. Next, the processor may determine a remaining time offset between the interface clock and the second interface clock. Furthermore, the processor modifies a future time when the electronic device is to perform the playback operation based on the remaining time offset to determine a corrected future time, and may perform the playback operation at the corrected future time.

公开(公告)号：US20180167646A1

公开(公告)日：2018-06-14

申请号：US15678083

申请日：2017-08-15

Applicant: EVA Automation, Inc.

Inventor： Leo Lay ,  Adrian Harold Chadd ,  Haisong Wang ,  Shiwei Zhao ,  Li Li ,  Gaylord Yu

IPC: H04N21/233 ,  H04H60/80 ,  H04N21/81 ,  H04M1/725 ,  H04L29/06

CPC classification number: G06F3/165 ,  H04H60/80 ,  H04L7/0012 ,  H04L7/0016 ,  H04L7/033 ,  H04L7/0331 ,  H04L65/4069 ,  H04L65/60 ,  H04L65/608 ,  H04L65/80 ,  H04M1/72558 ,  H04N21/233 ,  H04N21/4305 ,  H04N21/8113 ,  H04R3/12 ,  H04R27/00 ,  H04R2420/07

Abstract: A processor in an electronic device maintains coordination between a system clock provided by a system clock circuit and an interface clock provided by a clock circuit. Then, the processor may calculate, based on differences between transmit times when packets were transmitted by a second electronic device and receive times of the packets, relative drift as a function of time between the interface clock and a second interface clock in the second electronic device. Moreover, the processor adjusts, based on the relative drift, the system clock circuit to eliminate the relative drift. Next, the processor may determine a remaining time offset between the interface clock and the second interface clock. Furthermore, the processor modifies a future time when the electronic device is to perform the playback operation based on the remaining time offset to determine a corrected future time, and may perform the playback operation at the corrected future time.

公开(公告)号：US20180165056A1

公开(公告)日：2018-06-14

申请号：US15678069

申请日：2017-08-15

Applicant: EVA Automation, Inc.

Inventor： Leo Lay ,  Adrian Harold Chadd ,  Haisong Wang ,  Shiwei Zhao ,  Li Li ,  Gaylord Yu

IPC: G06F3/16 ,  H04R27/00 ,  H04L7/00 ,  H04L7/033

CPC classification number: G06F3/165 ,  H04H60/80 ,  H04L7/0012 ,  H04L7/0016 ,  H04L7/033 ,  H04L7/0331 ,  H04L65/4069 ,  H04L65/60 ,  H04L65/608 ,  H04L65/80 ,  H04M1/72558 ,  H04N21/233 ,  H04N21/4305 ,  H04N21/8113 ,  H04R3/12 ,  H04R27/00 ,  H04R2420/07

Abstract: An electronic device that coordinates a playback operation is described. In particular, an interface circuit in the electronic device may calculate, based on differences between transmit times when packets were transmitted by a second electronic device and receive times of the packets, relative drift as a function of time between a clock in the interface circuit and a second clock in the second electronic device. Then, the interface circuit may adjust, based on the relative drift, a clock circuit that provides the clock to eliminate the relative drift, and may determine a remaining time offset between the clock and the second clock. Next, the interface circuit may modify a future time when the electronic device is to perform the playback operation based on the remaining time offset to determine a corrected future time, and the electronic device may perform the playback operation at the corrected future time.

公开(公告)号：US20190227768A1

公开(公告)日：2019-07-25

申请号：US16369285

申请日：2019-03-29

Applicant: EVA Automation, Inc.

Inventor： David Bryant ,  Vanshil Shah ,  Leo Lay ,  Gaylord Yu

IPC: G06F3/16

Abstract: An electronic device may exchange packets with a second electronic device. These packets may include transmit times, based on a given clock in a given electronic device when the packets were transmitted. Moreover, when the packets are received by the electronic device, the electronic device may store associated receive times based on a clock in the electronic device. Using minimum time differences between the transmit and receive times, the electronic device may calculate a time offset between the electronic device and the second electronic device, which may then be used to determine future times in a clock domain of the second electronic device. Moreover, the electronic device may provide additional packets to the second electronic device, where a given additional packet includes audio data, and a playback time, corresponding to a given future time, when the audio data is to be played back by the second electronic device.

公开(公告)号：US10296286B2

公开(公告)日：2019-05-21

申请号：US15678078

申请日：2017-08-15

Applicant: EVA Automation, Inc.

Inventor： Leo Lay ,  Adrian Harold Chadd ,  Haisong Wang ,  Shiwei Zhao ,  Li Li ,  Gaylord Yu

IPC: H04J3/06 ,  G06F3/16 ,  H04R27/00 ,  H04L7/00 ,  H04L7/033 ,  H04H60/80 ,  H04L29/06 ,  H04M1/725 ,  H04N21/233 ,  H04N21/81 ,  H04N21/43 ,  H04R3/12

Abstract: An electronic device that reduces relative drift is described. In particular, an interface circuit in the electronic device may calculate, based on differences between transmit times when packets were transmitted by a second electronic device and receive times of the packets, relative drift as a function of time between a clock in the interface circuit and a second clock in the second electronic device. Then, the interface circuit may adjust, based on the relative drift, a clock circuit that provides the clock to eliminate the relative drift, and may store the adjustments to the clock circuit. Furthermore, when a wireless reset occurs, the interface circuit may adapt the clock circuit based on the stored adjustments to reduce the relative drift while the interface circuit restores frequency lock with the second clock based on additional packets with additional transmit times that are received from the second electronic device.

公开(公告)号：US20180167192A1

公开(公告)日：2018-06-14

申请号：US15678078

申请日：2017-08-15

Applicant: EVA Automation, Inc.

Inventor： Leo Lay ,  Adrian Harold Chadd ,  Haisong Wang ,  Shiwei Zhao ,  Li Li ,  Gaylord Yu

IPC: H04L7/00 ,  H04L7/033

CPC classification number: G06F3/165 ,  H04H60/80 ,  H04L7/0012 ,  H04L7/0016 ,  H04L7/033 ,  H04L7/0331 ,  H04L65/4069 ,  H04L65/60 ,  H04L65/608 ,  H04L65/80 ,  H04M1/72558 ,  H04N21/233 ,  H04N21/4305 ,  H04N21/8113 ,  H04R3/12 ,  H04R27/00 ,  H04R2420/07

Abstract: An electronic device that reduces relative drift is described. In particular, an interface circuit in the electronic device may calculate, based on differences between transmit times when packets were transmitted by a second electronic device and receive times of the packets, relative drift as a function of time between a clock in the interface circuit and a second clock in the second electronic device. Then, the interface circuit may adjust, based on the relative drift, a clock circuit that provides the clock to eliminate the relative drift, and may store the adjustments to the clock circuit. Furthermore, when a wireless reset occurs, the interface circuit may adapt the clock circuit based on the stored adjustments to reduce the relative drift while the interface circuit restores frequency lock with the second clock based on additional packets with additional transmit times that are received from the second electronic device.