4. Electrical audio signal processing systems and devices
  5. Including amplitude or volume control

Susumu Takumai

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Audio output apparatus

Electrical audio signal processing systems and devices – Including amplitude or volume control
Reexamination Certificate

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Optical disc recording apparatus and control method therefor

Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
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Surround-sound system

Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
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Profile ID: LFUS-PAI-P-2223720

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