Method and system for processing audio signal

Patent metadata

Field	Value
Publication number	US-12101070-B2
Application number	US-202217808321-A
Country	US
Kind code	B2
Filing date	Jun 23, 2022
Priority date	Dec 26, 2019
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A method for processing an audio signal includes setting target loudness; receiving metadata of an audio signal from a server; and adjusting the loudness of the audio signal by using the received metadata, so that the loudness of the audio signal corresponds to the set target loudness.

First claim

What is claimed is:

1. An audio signal processing method performed by a computer device having at least one processor, the method comprising:
setting a target loudness;
receiving metadata of an audio signal from a server; and
adjusting a loudness of the audio signal such that the loudness of the audio signal corresponds to the set target loudness using the received metadata,
wherein the received metadata includes an outlier bounce back (OBB) offset value to compensate for a difference value between an integrated loudness and the target loudness calculated to adjust the loudness of the audio signal, and
the loudness of the audio signal is adjusted based on the OBB offset value.

2. The audio signal processing method of claim 1 , wherein the adjusting of the loudness of the audio signal comprises:
calculating the difference value between the integrated loudness and the target loudness; and
applying the difference value to the audio signal when the target loudness is less than or equal to the integrated loudness or when a difference between the target loudness and a reference loudness included in the metadata is less than or equal to an OBB threshold.

3. The audio signal processing method of claim 1 , wherein the adjusting of the loudness of the audio signal comprises:
calculating the difference value between the integrated loudness and the target loudness, and
when the target loudness is greater than the integrated loudness and a difference between the target loudness and a reference loudness included in the metadata is greater than an OBB threshold,
applying the OBB offset value to the difference value; and
applying the difference value to which the OBB offset value is applied to the audio signal.

4. The audio signal processing method of claim 3 , wherein the OBB offset value is applied to the difference value such that an application ratio of the OBB offset value applied to the difference value varies according to the target loudness.

5. The audio signal processing method of claim 3 , wherein the OBB offset value is applied to the difference value such that an application ratio of the OBB offset value applied to the difference value increases according to an increase in the target loudness.

6. The audio signal processing method of claim 3 , wherein the applying of the OBB offset value comprises:
calculating an offset gain based on the target loudness;
calculating a compensation value based on the offset gain and the OBB offset value; and
applying the compensation value to the difference value.

7. The audio signal processing method of claim 1 , wherein the adjusting of the loudness of the audio signal further comprises calculating an OBB threshold as a value for determining whether to apply a compensation of a loudness gain using the OBB offset value based on the target loudness.

8. The audio signal processing method of claim 1 , wherein the OBB offset value is calculated by the server using a parameter used to calculate the loudness of the audio signal.

9. The audio signal processing method of claim 8 , wherein the parameter includes at least one of a section-by-section loudness for the audio signal, a loudness range (LRA), a true-peak, and a peak-to-loudness ratio (PLR).

10. An audio signal processing method performed by a computer device having at least one processor, the method comprising:
calculating an outlier bounce back (OBB) offset value for compensation of a difference value between an integrated loudness and a target loudness calculated to adjust a loudness of an audio signal;
calculating a reference loudness;
generating metadata of the audio signal that includes the calculated OBB offset value and the reference loudness; and
storing the generated metadata,
wherein the stored metadata is provided to a client in response to a request from a client to enable the client to adjust a loudness of the audio signal such that the loudness of the audio signal corresponds to a set target loudness using the received metadata including the OBB offset value.

11. The audio signal processing method of claim 10 , wherein the OBB offset value is calculated using a parameter used to calculate the loudness of the audio signal.

12. The audio signal processing method of claim 11 , wherein the parameter includes at least one of a section-by-section loudness for the audio signal, a loudness range (LRA), a true-peak, and a peak-to-loudness ratio (PLR).

13. The audio signal processing method of claim 10 , wherein the calculating of the reference loudness comprises calculating a loudness to be measured when matching the loudness of the audio signal to a preset loudness as a reference loudness.

14. A non-transitory computer-readable recording medium storing a computer program for implementing the method claim 1 in a computer device.

15. A computer device comprising:
at least one processor configured to execute a computer-readable instruction,
wherein the at least one processor is configured to,
calculate an outlier bounce back (OBB) offset value for compensation of a difference value between an integrated loudness and a target loudness calculated to adjust a loudness of an audio signal,
calculate a reference loudness,
generate metadata of the audio signal that includes the calculated OBB offset value and the reference loudness, and
store the generated metadata,
wherein the stored metadata is provided to a client in response to a request from a client to enable the client to adjust a loudness of the audio signal such that the loudness of the audio signal corresponds to a set target loudness using the received metadata including the OBB offset value.

16. The computer device of claim 15 , wherein the at least one processor is configured to calculate the OBB offset value using a parameter used to calculate the loudness of the audio signal.

17. The computer device of claim 15 , wherein the at least one processor is configured to calculate a loudness to be measured when matching the loudness of the audio signal to a preset loudness as a reference loudness.

Assignees

• Naver Corp
• Gaudio Lab Inc

Inventors

• Jo Seongcheol
• An Taek Su
• Kang Sung Hyun
• Lee Jiung
• Choi Byung Gyou
• Hur Jeongsoo
• Seo Jeonghun
• Chon Sang Bae
• Oh hyun oh

Classifications

• H03G5/005

  of digital signals · CPC title

• H03G3/32

  the control being dependent upon ambient noise level or sound level · CPC title

• H03G3/002

  Control of digital or coded signals (H03G3/3089 take precedence) · CPC title

• H03G7/007 Primary

  of digital or coded signals · CPC title

• H04N21/233

  Processing of audio elementary streams {(monitoring, identification or recognition of audio in broadcast systems H04H60/58)} · CPC title