Exhibit 4.2

Case 2:23-cv-00199-JRG Document 9-5 Filed 06/21/23 Page 1 of 6 PageID #: 316
JBL Professional - Harman – column loudspeaker array with beam shaping for adjustable coverage

(See Accused Product List at end of chart for models)

Infringement of the ‘430 patent

Claim #3 Evidence

3. A speaker system for producing

localized regions of sound 

comprising:

The JBL Professional - Harman column loudspeaker array is speaker 

a system for producing localized regions of sound.

For example, the column loudspeaker array produces an acoustic 

beam of sound. The beam can be aimed at the listening audience 

while keeping it away from other surfaces (e.g. ceiling and walls) 

that may cause echoes and reverberation.

[2]

1

Case 2:23-cv-00199-JRG Document 9-5 Filed 06/21/23 Page 2 of 6 PageID #: 317
a multiplicity of audio frequency 

speakers;

The JBL Professional - Harman column loudspeaker array includes a 

multiplicity of audio frequency speakers.

For example, column loudspeaker array has an array of seventeen 

individual 4” audio loudspeakers mounted along the axial direction 

of the loudspeaker.

[1]

at least one defined sound target The JBL Professional - Harman column loudspeaker array has at 

2

Case 2:23-cv-00199-JRG Document 9-5 Filed 06/21/23 Page 3 of 6 PageID #: 318
spaced from each of the speakers 

of the multiplicity of speakers, 

wherein each speaker has a 

means for applying a time varying

audio drive voltage which is 

substantially identical, except that

each audio drive voltage is offset 

in time by an amount which is 

related to the distance between 

each speaker and the defined 

sound target, so that substantially

identical sound from each speaker

reaches the sound target at the 

same time; and

least one defined sound target spaced from each of the speakers of 

the multiplicity of speakers. Each speaker has a means for applying 

a time varying audio drive voltage which is substantially identical, 

except that each audio drive voltage is offset in time by an amount 

which is related to the distance between each speaker and the 

defined sound target. So that substantially identical sound from 

each speaker reaches the sound target at the same time.

For example, each of the speakers is connected to an audio 

amplifier. An audio signal is provided to each speaker via the 

speaker’s respective amplifier. The audio signal is delayed more for 

speakers closer to the position at which the acoustic beam is aimed 

and delayed less for speakers farther from that position. 

[2]

According to the specification the term: “substantially identical” 

means:

“It should be understood that when, a means for applying a time 

3

Case 2:23-cv-00199-JRG Document 9-5 Filed 06/21/23 Page 4 of 6 PageID #: 319
varying audio drive voltage, i.e. the signal used to drive individual 

speakers is described as substantially identical, the signals are 

defined as being substantially identical, although they vary in 

amplitude. The term, substantially identical, means capable of 

constructive interference when used in the sound system 36 of this 

invention.” [col.12 lines 18-24]

wherein the means for applying a 

time varying audio drive voltage 

includes a class D amplifier.

The means for applying a time varying audio drive voltage includes 

a class D amplifier.

For example, a sixteen-channel class-D audio amplifier is used to 

drive the loudspeakers in the array. 

[1]

Accused Product List

Intellivox Loudspeaker Array series: DS115, DS180, DSX180, DS280, DSX280 HD, DS380, DSX380 HD, 

DS430, DSX430, DS500, DSX500, HP-DS170, HP-DS370

References

[1] JBL Professional – DS430

https://jblpro.com/en/products/intellivox-ds430

[2] JBL Professional – Intellivox Speakers – Powered Adjustable-Coverage Columns

https://jblpro.com/en/product_families/intellivox-powered-adjustable-coverage-columns

[3] JBL Intellivox Beyond Beam Steering

4

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https://jblpro.com/resource/jbl-intellivox-beyond-beam-steering.pdf

General References

[A] Fohhn – Beam Steering Technology

https://www.fohhn.com/en/technologies/fohhn-beam-steering-technology/

[B] Digital Smart Homes – YSP Sound Projector

http://www.digitalsmarthomes.com/products/yamahaysp/digital_sound_projector.html

[C] ResearchGate - Audio Beam Steering With Phased Array Method Using Arduino Due Microcontroller

https://www.researchgate.net/profile/Muhammad-Rivai/publication/

324956381_Audio_beam_steering_with_phased_array_method_using_Arduino_Due_Microcontroller/links/

5b0296594585154aeb069455/Audio-beam-steering-with-phased-array-method-using-Arduino-DueMicrocontroller.pdf

5

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