4. Electrical audio signal processing systems and devices
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Frequency warping for improving resonator signal-to-noise ratio

Electrical audio signal processing systems and devices – Noise or distortion suppression
Reexamination Certificate

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Frequency-dependent amplitude modification devices for acoustic

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent

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Frequency-focused actuators for active vibrational energy contro

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within cabin or compartment of vehicle
Patent

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Frequency-selective sound transducer

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent

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Front-end processor for narrowband transmission

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent

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Full range convex electrodynamic loudspeaker

Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent

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Full range loudspeaker

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

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Full range planar magnetic microphone and arrays thereof

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

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Full sound enhancement using multi-input sound signals

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

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Fully compatible AM stereophonic transmitting system

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent

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Fully integrated amplified loudspeaker

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With magnetic loudspeaker
Reexamination Certificate

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Functional panel for audio mixer

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

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Fuzzy logic device for automatic sound control

Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Patent

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