4. Electrical audio signal processing systems and devices
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Directable microphone system

Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent

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Directed radiator with modulated ultrasonic sound

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

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Direction adjusting arrangement for tweeter

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Reexamination Certificate

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Direction detection apparatus, direction detection method...

Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate

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Direction finder

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

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Direction sensing microphone system using time differential

Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent

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Directional acoustic signal processor and method therefor

Electrical audio signal processing systems and devices – Dereverberators
Patent

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Directional audio signal processing using an oversampled...

Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate

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Directional audio signal processing using an oversampled...

Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate

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Directional capacitor microphone

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

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Directional capacitor microphone system

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

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Directional decoding

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

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Directional dynamic microphone interchangeable to have...

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

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Directional ear device with adaptive bandwidth and gain control

Electrical audio signal processing systems and devices – Hearing protectors – electrical
Patent

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Directional enhancement circuit

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent

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Directional hearing aid

Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent

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Directional hearing aid

Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent

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Directional hearing aid

Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent

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Directional hearing aid assembly

Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent

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Directional hearing aid tester

Electrical audio signal processing systems and devices – Hearing aids – electrical
Reexamination Certificate

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