# US 10,504,528 B2 · Method and device for processing internal channels for low complexity format conversion

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- Number: US 10,504,528 B2
- Document ID: US10504528B2
- Status: Granted
- Kind: B2
- Application number: 15/736,809
- Filed: 2016-06-17
- Published: 2018-06-14
- Granted: 2019-12-10
- Earliest claimed: 2015-06-17
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Sun-min Kim; Sang-bae Chon
- Web page: https://patentgrep.com/patent/US10504528B2

## CPC

- G10L 19/008: Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
- H03G 5/165: {Equalizers; Volume or gain control in limited frequency bands}
- H04N 21/233: Processing of audio elementary streams {(monitoring, identification or recognition of audio in broadcast systems H04H60/58)}
- H04N 21/439: Processing of audio elementary streams
- H04S 3/008: {in which the audio signals are in digital form, i.e. employing more than two discrete digital channels (data reduction aspects thereof based on psychoacoustics G10L19/02)}
- H04S 2400/03: Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1 (H04S2400/01 takes precedence)
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- H03G: CONTROL OF AMPLIFICATION
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04S: STEREOPHONIC SYSTEMS

## Abstract

To address the technical problem, provided is a method of processing an audio signal, and the method including: receiving an audio bitstream that is encoded by using MPEG surround 212 (MPS212); obtaining internal channel gains with respect to one channel pair element (CPE) based on MPS212 parameters and rendering parameters about MPS212 output channels defined in a format converter; generating an internal channel signal with respect to the CPE based on the received audio bitstream and the obtained internal channel gains; and generating stereo output channel signals based on the generated internal channel signal.

## Claims

### Claim 1

A method of processing an audio signal, the method comprising:
receiving a channel pair element (CPE) that is encoded by using MPEG surround 212 (MPS212);
calculating an internal channel gain with respect to the received channel pair element based on MPS212 parameters and rendering parameters including equalizer (EQ) gain values and gain values;
generating an internal channel signal based on the received channel pair element and the calculated internal channel gain; and
generating stereo output channel signals based on the generated internal channel signal,
wherein the internal channel gain GICHl,m is calculated by using
G
ICH
l
,
m
=
(
c
left
l
,
m
×
G
left
×
G
EQ
,
left
m
)
2
+
(
c
right
l
,
m
×
G
right
×
G
EQ
,
right
m
)
2
where l denotes a time slot index and m denotes a frequency band index,
c leftl,m and crightl,m are channel level difference (CLD) values for the CPE,
Gleft and Gright are the gain values defined in a format converter according to MPS212 output channels, and
GEQ,leftm and GEQ,rightm are the equalizer (EQ) gain values defined in the format converter according to the MPS212 output channels.

### Claim 2 (depends on 1)

The method of claim 1, wherein the audio signal is an immersive audio signal.

### Claim 3 (depends on 1)

A non-transitory computer-readable recording medium having recorded thereon a program, which when executed by a computer, performs the method of claim 1.

### Claim 4

An apparatus for processing an audio signal, the apparatus comprising:
a receiver configured to receive a channel pair element that is encoded by using an MPEG surround 212 (MPS212);
an internal channel processor configured to calculate an internal channel gain with respect to the received channel pair element based on MPS212 parameters and rendering parameters including equalizer (EQ) gain values and gain values, and to generate an internal channel signal based on the received channel pair element and the calculated internal channel gain; and
a stereo output signal generator configured to generate stereo output channel signals based on the generated internal channel signal,
wherein the internal channel gain GICHl,m calculated by using
G
ICH
l
,
m
=
(
c
left
l
,
m
×
G
left
×
G
EQ
,
left
m
)
2
+
(
c
right
l
,
m
×
G
right
×
G
EQ
,
right
m
)
2
where l denotes a time slot index and m denotes a frequency band index,
cleftl,m and crightl,m are channel level difference (CLD) values for the CPE,
Gleft and Gright are the gain values defined in a format converter according to the MPS212 output channels, and
GEQ,leftm and GEQ,rightm are the equalizer (EQ) gain values defined in the format converter according to the MPS212 output channels.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein the audio signal is an immersive audio signal.