4. Electrical audio signal processing systems and devices
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Qsound surround synthesis from stereo

Electrical audio signal processing systems and devices – Binaural and stereophonic – Pseudo stereophonic
Reexamination Certificate

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Quasi-differential power amplifier and method

Electrical audio signal processing systems and devices – With amplifier
Reexamination Certificate

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Quick release spider clamp for loudspeakers

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate

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Quick-detachable structure for on-wall speaker panel

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Mounting or support feature of housed loudspeaker
Reexamination Certificate

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Quick-detachable structure for on-wall speaker panel

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Mounting or support feature of housed loudspeaker
Reexamination Certificate

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Quick-updating stethoscope receiver

Electrical audio signal processing systems and devices – Stethoscopes – electrical
Reexamination Certificate

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Quiet active fan for servers chassis

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – From appliance
Reexamination Certificate

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