4. Electrical audio signal processing systems and devices
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Audio signal reproducing apparatus

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

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Audio signal reproducing apparatus

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Audio signal reproducing apparatus

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Audio signal reproducing device

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

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Audio signal reproduction apparatus

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

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Audio signal reproduction device

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

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Audio signal separation device and method thereof

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

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Audio signal source balancing adapters

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

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Audio signal storing apparatus having a function for converting

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

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Audio signal supplying device, parameter providing system,...

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

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Audio signal switching apparatus

Electrical audio signal processing systems and devices – Switching
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Audio signal system

Electrical audio signal processing systems and devices – Hearing aids – electrical
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Audio signal transmission circuit

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

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Audio signal transmission system

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

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Audio signal transmitting apparatus audio signal receiving appar

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

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Audio signal waveform emphasis processing device and method

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

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Audio source and primary monitoring station communications

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

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Audio source selection circuit

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

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Audio spatial enhancement apparatus and methods

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

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Audio spatial environment engine

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

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