# US 11,445,317 B2 · Method and apparatus for localizing multichannel sound signal

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- Number: US 11,445,317 B2
- Document ID: US11445317B2
- Status: Granted
- Kind: B2
- Application number: 14/324,740
- Filed: 2014-07-07
- Published: 2014-11-13
- Granted: 2022-09-13
- Earliest claimed: 2012-01-05
- Assignees: Samsung Electronics Co., Ltd.; Korea Advanced Institute of Science and Technology
- Applicants: Samsung Electronics Co., Ltd.; Korea Advanced Institute of Science and Technology
- Inventors: Yoon-jae Lee; Young-jin Park; Hyun Jo; Sun-min Kim; Young-tae Kim
- Web page: https://patentgrep.com/patent/US11445317B2

## CPC

- H04S 5/00: Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
- H04S 7/307: {Frequency adjustment, e.g. tone control (H04S7/301 takes precedence)}
- H04S 2400/11: Positioning of individual sound objects, e.g. moving airplane, within a sound field (H04S2420/13 takes precedence)
- H04S 2420/01: Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
- H04S 2420/07: Synergistic effects of band splitting and sub-band processing
- H04S: STEREOPHONIC SYSTEMS

## Abstract

Provided are a method and apparatus for localizing a multichannel sound signal. The method includes: obtaining a multichannel sound signal to which sense of elevation is applied by applying a first filter to an input sound signal; determining at least one frequency range of a dynamic cue according to change of a head-related transfer function (HRTF) indicating information regarding paths from a spatial location of an actual speaker to ears of an audience; and applying a second filter to at least one sound signal, corresponding to the determined at least one frequency range, of at least one channel in the multichannel sound signal to change the at least one sound signal so as to remove or to reduce the dynamic cue when the multichannel sound signal is output.

## Claims

### Claim 1

An immersive three-dimensional (3D) sound reproducing method comprising:
receiving input channel audio signals including at least one height input channel signal and an input channel configuration;
obtaining gains based on the input channel configuration and an output channel configuration;
obtaining a first head-related transfer function (HRTF) based on the input channel configuration, to provide a sense of elevation using the output channel configuration indicating a plurality of output speakers located on a horizontal plane;
obtaining a second HRTF used according to an input channel audio signal at a predetermined position, the input channel audio signal being output through at least two speakers at positions different from the predetermined position, based on the input channel configuration, the output channel configuration, and a frequency range of dynamic cue;
obtaining a HRTF filter by dividing the second HRTF by the first HRTF; and
elevation rendering the input channel audio signals based on the gains, the HRTF filter, to provide the sense of elevation using the output channel configuration,
wherein the second HRTF includes filter coefficients for a plurality of frequency bands dividing the frequency range,
wherein each of the at least one height input channel signal is outputted to at least two of output channel audio signals via at least two output speakers located on the horizontal plane, and
wherein the frequency range of the dynamic cue is determined according to a change of the second head related transfer function.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the dynamic cue represents speaker-to-listener orientation.

### Claim 3 (depends on 1)

The method of claim 1,
wherein the second HRTF is determined based on spatial locations of a output channel signal and a input channel signal located at a predetermined elevation.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

The method of claim 1,
wherein the second HRTF is determined based on spatial locations of an output channel signal and an input channel signal located on the horizontal plane.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first HRTF indicates information regarding paths from a spatial location of the plurality of output speakers to ears of an audience, and the second HRTF indicates information regarding paths from a spatial location of a virtual speaker located at a predetermined elevation to ears of the audience.

### Claim 7

An immersive three-dimensional (3D) sound reproducing apparatus comprising:
receiver configured to receive input channel audio signals including at least one height input channel signal and an input channel configuration;
elevation renderer configured to obtain gains based on the input channel configuration and an output channel configuration, obtain a first head-related transfer function (HRTF) based on the input channel configuration, to provide a sense of elevation using the output channel configuration indicating a plurality of output speakers located on a horizontal plane, obtain a second HRTF used according to an input channel audio signal at a predetermined position, the input channel audio signal being output through at least two speakers at positions different from the predetermined position, based on the input channel configuration, the output channel configuration, and a frequency range of dynamic cue, obtain a HRTF filter by dividing the second HRTF by the first HRTF, and render the input channel audio signals based on the gains, and the HRTF filter, to provide the sense of elevation using the output channel configuration,
wherein the second HRTF includes filter coefficients for a plurality of frequency bands dividing the frequency range,
wherein each of the at least one height input channel signal is outputted to at least two of output channel audio signals via at least two output speakers located on the horizontal plan, and
wherein the frequency range of the dynamic cue is determined according to a change of the second head related transfer function.

### Claim 8 (depends on 7)

The apparatus of claim 7,
wherein the dynamic cue represents speaker-to-listener orientation.

### Claim 9 (depends on 7)

The apparatus of claim 7,
wherein the second HRTF is determined based on spatial locations of a output channel signal and a input channel signal located on a same plane.

### Claim 10 (depends on 9)

The apparatus of claim 9,
wherein the same plane is the horizontal plane.

### Claim 11 (depends on 7)

The apparatus of claim 7, wherein the first HRTF indicates information regarding paths from a spatial location of the plurality of output speakers to ears of an audience, and the second HRTF indicates information regarding paths from a spatial location of a virtual speaker located at a predetermined elevation to ears of the audience.