US 12,573,432 B2Granted

Method for audiovisual signal synchronization and audiovisual synchronization processing system

AssigneeRealtek Semiconductor Corp.

InventorsShih-Hua Wei, Yung-Jui Lee, Ting-Pang Tsao

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Abstract

A method and a system for audiovisual signal synchronization are provided. The method is adapted to an audiovisual system. When the audiovisual system is in operation, a circuit for distributed audiovisual synchronization-calibration is provided for acquiring delay information reported by various audiovisual circuit modules that are in charge of processing audiovisual signals. Accordingly, the audiovisual synchronization processing system that is disposed in the audiovisual system to synchronize the audiovisual signals can obtain a time difference between audio signals and video signals. When processing audio and video data, the audiovisual system can utilize the time difference to synchronize the audio signals and the video signals, and then output an audiovisual content.

Claims7

Dependent claims

A method for audiovisual signal synchronization, which is adapted to an audiovisual system, comprising:

receiving audio and video data after turning on an audiovisual device or switching to an audiovisual channel;
collecting, by a circuit for distributed audiovisual synchronization-calibration of the audiovisual system in a distributed manner, delay information provided by one or more audio processing circuits that are activated on an audio processing path and is used to process audio signals in the audiovisual system and one or more video processing circuits that are activated on a video processing path and is used to process video signals in the audiovisual system, wherein, a processing circuit for audiovisual signal synchronization of the audiovisual system checks one or multiple ones of the one or more audio processing circuits and the one or more video processing circuits that is activated to process the audio signals and the video signals in the audio and video data;
calculating a time difference between the audio signals and the video signals in the audio and video data according to the delay information;
and
performing an audio and video data processing procedure to calibrate the audio signals and the video signals, and outputting an audiovisual content after synchronizing the audio signals and the video signals according to the time difference;
wherein the delay information obtained by the circuit for distributed audiovisual synchronization-calibration is used to establish a lookup table, which includes an audio processing time table that records a processing time of the one or more audio processing circuits for processing the audio signals, and a video processing time table that records a processing time of the one or more video processing circuits for processing the video signals;
wherein the lookup table is established by steps of:
preparing an audio and video sample;
inserting an audiovisual mark into the audio and video sample;
measuring, based on the audiovisual mark, the processing time of the one or more audio processing circuits and the processing time of the one or more video processing circuits for processing the audio signals and the video signals of the audio and video sample on the audio processing path and the video processing path, respectively;
and
establishing the lookup table.

9 more elements

An audiovisual synchronization processing system, which is disposed in an audiovisual system, comprising:

a processing circuit for audiovisual signal synchronization;
and
a circuit for distributed audiovisual synchronization-calibration;
wherein the processing circuit for audiovisual signal synchronization operates a method for audiovisual signal synchronization, and the method includes:
receiving audio and video data after turning on an audiovisual device or switching to an audiovisual channel;
collecting, by the circuit for distributed audiovisual synchronization-calibration in a distributed manner, delay information provided by one or more audio processing circuits that are activated on an audio processing path and is used to process audio signals in the audiovisual system and one or more video processing circuits that are activated on a video processing path and is used to process video signals in the audiovisual system, wherein, the processing circuit for audiovisual signal synchronization of the audiovisual system checks one or multiple ones of the one or more audio processing circuits and the one or more video processing circuits that is activated to process the audio signals and the video signals in the audio and video data according to format data of the audio and video data according to format data of the audio and video data;
calculating time difference between the audio signals and the video signals in the audio and video data according to the delay information;
and
performing an audio and video data processing procedure to calibrate the audio signals and the video signals, and outputting, by the audiovisual system, an audiovisual content after synchronizing the audio signals and the video signals according to the time difference;
wherein the delay information obtained by the circuit for distributed audiovisual synchronization-calibration is used to establish a lookup table, which includes an audio processing time table that records a processing time of the one or more audio processing circuits for processing the audio signals, and a video processing time table that records a processing time of the one or more video processing circuits for processing the video signals;
wherein the lookup table is established by steps of:
preparing an audio and video sample;
inserting an audiovisual mark into the audio and video sample;
measuring, based on the audiovisual mark, the processing time of the one or more audio processing circuits and the processing time of the one or more video processing circuits for processing the audio signals and the video signals of the audio and video sample on the audio processing path and the video processing path, respectively;
and
establishing the lookup table.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/123,380Filed 20 Mar 2023
Priority: TW 11111046322 Mar 2022
Published: US 2023/0307005 A128 Sep 2023
Granted: 10 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G11B 27/10
Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel: indexing; Addressing; Timing or synchronising;…
G11B 27/34
Indexing; Addressing; Timing or synchronising; Measuring tape travel: indicating arrangements
H04N 17/00
Diagnosis, testing or measuring for television systems or their details
H04N 17/04
Diagnosis, testing or measuring for television systems or their details: for receivers