4. Electrical audio signal processing systems and devices
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Audio surround system with stereo enhancement and directivity se

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

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Audio surveillance discouragement apparatus and method

Electrical audio signal processing systems and devices – Sound or noise masking
Patent

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Audio switch device with timed insertion of substitute signal

Electrical audio signal processing systems and devices – With mixer
Patent

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Audio system

Electrical audio signal processing systems and devices – Sound effects
Reexamination Certificate

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Audio system

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

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Audio system

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

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Audio system

Electrical audio signal processing systems and devices – Vehicle
Reexamination Certificate

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Audio system

Electrical audio signal processing systems and devices – Sound effects
Reexamination Certificate

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Audio system

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

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Audio system

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

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Audio system

Electrical audio signal processing systems and devices – Including frequency control
Reexamination Certificate

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Audio system

Electrical audio signal processing systems and devices – Including frequency control
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Audio system

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

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Audio system

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

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Audio system and audio interface

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

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AUDIO SYSTEM AND ITS CONTENTS REPRODUCTION METHOD, AUDIO...

Electrical audio signal processing systems and devices – Vehicle
Reexamination Certificate

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Audio system and method

Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
Reexamination Certificate

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Audio system and method of use

Electrical audio signal processing systems and devices – Vehicle
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Audio system enhancement using psycho acoustic matrix

Electrical audio signal processing systems and devices – Including frequency control
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Audio system for a computer

Electrical audio signal processing systems and devices – Including frequency control – Automatic tone control
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