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Sound reproduction in portable electronic equipment

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

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Sound reproduction method and apparatus for assessing...

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Testing of hearing aids
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Sound reproduction method, sound reproduction apparatus,...

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

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Sound reproduction system

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Driven diverse static structure
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Sound reproduction system

Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Patent

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Sound reproduction system

Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent

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Sound reproduction system

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

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Sound reproduction system

Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Patent

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Sound reproduction system and a sound reproduction method

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

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Sound reproduction system and method

Electrical audio signal processing systems and devices – Having non-electrical feature – Loudspeakers driven in given phase relationship
Patent

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Sound reproduction system having a matrix converter

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

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Sound reproduction system having enhanced low frequency directio

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

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Sound reproduction system having sonic image localization networ

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

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Sound reproduction system utilizing sound extinction device

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

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Sound reproduction systems

Electrical audio signal processing systems and devices – Including frequency control
Patent

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Sound Reproduction systems

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

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Sound signal encoding apparatus and method

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

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Sound signal generator testing apparatus

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices
Reexamination Certificate

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Sound signal mixing

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

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Sound signal output circuit and method

Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Patent

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