Data processing: generic control systems or specific application – Specific application – apparatus or process – Digital audio data processing system
Reexamination Certificate
2002-03-25
2009-02-17
Ni, Suhan (Department: 2615)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Digital audio data processing system
C381S107000, C381S109000
Reexamination Certificate
active
07493179
ABSTRACT:
Embodiments of the present invention relate generally to digital volume control in digital audio systems. One embodiment relates to a digital audio system having a digital audio processor and a digital volume control coupled to the digital audio processor. The digital volume control includes a feedback loop having an attenuator, and error determination unit, and a filter. The feedback loop determines the attenuation error and shifts the attenuation error beyond a predetermined digital audio range. The output of the digital volume control maintains a substantially constant SNR and THD with respect to the level attenuation over the predetermined digital audio range.
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patent: 10-341121 (1998-12-01), None
Kazuya, Iwata, “Digital Attenuator”, Dec. 22, 1998, JPO, machine translation, Detailed Description pp. 1-6, Claims p. 1, Description of Drawings p. 1, Drawings pp. 1-2.
Iwata, Kazuya, “Digital Attenuator”, Dec. 22, 1998, English Translation of Japanese Patent 10-341121, pp. 1-25.
Mitra, Sanjit K., “Digital Signal Processing”, 2001, McGraw-Hill, second edition, pp. 813-822.
Gonzalez Octavio A.
Seaberg Charles E.
Chiu Joanna G.
Freescale Semiconductor Inc.
Hill Daniel D.
Ni Suhan
Sellers Daniel R
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