4. Electrical audio signal processing systems and devices
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Presence activated hearing assistive system

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

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Presence control for guitar amplifier

Electrical audio signal processing systems and devices – With musical instrument
Reexamination Certificate

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Press-fit ear wax barrier

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

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Press-fit ear wax barrier

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

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Press-fit sound damping structure

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

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Pressure gradient microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Thermal response to – or generation of – sound vibration
Patent

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Pressure gradient type microphone apparatus with acoustic termin

Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo sound pickup device
Patent

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Pressure responsive device and method of manufacturing...

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Reexamination Certificate

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Pressure transducing assembly

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

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Pressure wave transducing

Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent

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Pressure wave transducing

Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent

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Pressure-compensated pneumatic speech simulator

Electrical audio signal processing systems and devices – Artificial larynx – electrical
Patent

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Pressure-gradient microphone capsule

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Reexamination Certificate

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Prismatic loudspeaker/microphone array

Electrical audio signal processing systems and devices – Having non-electrical feature – And loudspeaker
Reexamination Certificate

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Probe microphone

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Testing of hearing aids
Patent

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Probe microphone

Electrical audio signal processing systems and devices – Monitoring of sound
Patent

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Procedure and device for facilitating audiovisual observation of

Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo sound pickup device
Patent

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Procedure and device for linearizing the characteristic...

Electrical audio signal processing systems and devices – Feedback suppression
Reexamination Certificate

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Procedure for setting a hearing aid, and hearing aid

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

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Process and apparatus for alternately switching radio signals ov

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

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