Height-Channel Soundbar Beam Steering for Direct Sound Cancellation

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Solution Overview

Problem

Existing surround-sound systems, particularly those with Height-Channel speakers, suffer from undesirable direct sound radiation that detracts from the intended immersive 3-D sound field, leading to flawed audio reproduction.

Innovation Solution

A soundbar system with front-facing mid-bass transducers reproduces a phase-reversed replica of Height-Channel signals, combined with phased array beam steering to cancel direct sound radiation and improve radiation patterns, using band-pass filtering and delay to optimize audio performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If Height-Channel speaker arrays are used to create immersive 3-D sound field, then spatial audio experience is improved, but direct sound radiation toward listener increases causing flawed audio reproduction

Engineering Contradiction:

Improveimmersive 3-D sound fieldVSAvoiddirect sound radiation

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies active noise cancellation technology to convert the harmful direct sound radiation from Height-Channel arrays into a beneficial effect. By generating anti-phase sound waves from front-facing transducers that match the characteristics of direct radiation, the system cancels out the harmful direct sound while preserving the desired ceiling-reflected sound, thereby transforming the problem into a solution

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The front-facing mid-bass transducers serve as intermediary elements that generate cancellation signals. These transducers act as a mediator between the Height-Channel arrays and the listening environment, producing sound waves that interfere destructively with direct radiation and constructively with the intended spatial audio effect

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If multiple loudspeakers are installed for traditional surround sound, then audio quality is improved, but system complexity and installation difficulty increase

Engineering Contradiction:

Improveaudio qualityVSAvoidsystem complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent merges multiple functions into a single soundbar enclosure. The soundbar integrates traditional front channel speakers, subwoofer, and front-facing cancellation transducers in one unit, while the TV serves as both display and mounting surface. This consolidation maintains high audio quality through multiple drivers while reducing installation complexity compared to traditional multi-speaker systems

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The soundbar system exhibits multi-functionality by serving multiple purposes: it provides traditional front channel audio, subwoofer bass, active noise cancellation for Height-Channel arrays, and mounts to the TV. This universal design allows a single device to replace multiple separate components, improving audio quality without proportionally increasing system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-generated harmful factors

If soundbar uses front-facing transducers for cancellation, then direct sound radiation is reduced, but device complexity increases

Engineering Contradiction:

Improvedirect sound radiationVSAvoiddevice complexity

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The soundbar's front-facing transducers use the soundbar's own mid-bass drivers to generate cancellation signals. Rather than requiring separate external cancellation devices, the system uses its existing hardware resources (mid-bass transducers) to perform the cancellation function, thereby reducing direct sound radiation without adding significant external complexity

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system effectively reduces direct sound radiation, allowing for wider seating arrangements and improved audio fidelity by steering sound beams to enhance the immersive experience.

Implementation Method 1

front facing mid-bass transducers to reproduce a phase-reversed replica of the Height-Channel (e.g., ATMOS) signals

Methodology Applied

Scientific EffectPhase reversal:

Implementation Method 2

reproduce a band-passed phase reversed replica of the Height-Channel (e.g., ATMOS) signals

Methodology Applied

Scientific EffectDestructive interference: Interference

Implementation Method 3

phased array beam steering to cancel direct sound radiation and improve radiation patterns

Methodology Applied

Scientific EffectPhased array beam steering:

Data Source

PatentUS20260059254A1Active cancellation of a height-channel soundbar array's forward sound radiation

Publication Date: 2026.02.26 POLK AUDIO LLC

AI summary

A multi-driver multi-channel single enclosure Height-Channel (e.g., ATMOS™ or DTS-X®) enabled soundbar loudspeaker system 260 uses a novel signal processing system, driver mounting configuration (310L, 310R) and method to provide a high fidelity home theater listening experience, in a manner which relies on a new method for cancellation of unwanted direct (not ceiling-bounced) radiation of the Height-Channel (or virtual height envelopment) channel's sound 2130S.