Data processing: generic control systems or specific application – Specific application – apparatus or process – Digital audio data processing system
Reexamination Certificate
2006-06-06
2006-06-06
Chin, Vivian (Department: 2644)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Digital audio data processing system
C381S111000, C341S143000, C330S251000
Reexamination Certificate
active
07058463
ABSTRACT:
An audio path is constructed to include a multi-bit sigma-delta converter for converting an N-bit digital input to an n-bit output representing an over-sampled, lower resolution n-bit version of the N-bit digital input; a formatter for converting the n-bit output to an m signal output (e.g., as a thermometer code, a SDM format or a PWM format); an m-by-m switching matric for receiving the m output signals and for reordering the m output signals, m class-D drivers individual ones of which are driven by one of the reordered m output signals for driving one of m speakers; and a dynamic element matching (DEM) block coupled to the switching matric for controlling the reordering of the m output signals driving the m class-D drivers for spreading the distortion due at least to driver-speaker pair mismatch to wide band noise. The DEM may operate to generate white noise, or it may generate shaped (colored) noise.
REFERENCES:
patent: 4515997 (1985-05-01), Stinger, Jr.
patent: 5144308 (1992-09-01), Norsworthy
patent: 5592559 (1997-01-01), Takahashi et al.
patent: 5745061 (1998-04-01), Norsworthy et al.
patent: 5889482 (1999-03-01), Zarubinsky et al.
patent: 5990815 (1999-11-01), Linder et al.
patent: 5990819 (1999-11-01), Fujimori
patent: 6011501 (2000-01-01), Gong et al.
patent: 6087969 (2000-07-01), Stockstad et al.
patent: 6346898 (2002-02-01), Melanson
patent: 6414614 (2002-07-01), Melanson
patent: 4117607 (1992-12-01), None
patent: 0543224 (1992-11-01), None
patent: 0899884 (1998-06-01), None
patent: 0936837 (1999-02-01), None
patent: WO-96/31086 (1996-10-01), None
patent: WO 98/44626 (1998-10-01), None
Multibit Σ-Δ A/D Converter Incorporating A Novel Class of Dynamic Element Matching Techniques; Leung, Bosco H et al; IEEE Transactions on Circuits and Systems II Analog and Digital Signal Processing, vol. 39 No. 1; Jan. 1992.
Linearity Enhancement of Multibit ΔΣ A/D and D/A Converters Using Data Weighted Averaging; Baird, Rex T. et al; IEEE Transactions on Circuits and Systems II Analog and Digital Signal Processing, vol. 42 No. 12; Dec. 1995.
A Noise-Shaping Coder Topology for 15+ Bit Converters; Carley, L. Richard; IEEE Journal of Solid-State Circuits, vol. 24, No. 2; Apr. 1989.
Ruha Antti
Ruotsalainen Tarmo
Tervaluoto Jussi-Pekka
Chau Corey
Chin Vivian
Harrington & Smith ,LLP
Nokia Corporation
LandOfFree
Method and apparatus for implementing a class D driver and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for implementing a class D driver and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for implementing a class D driver and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3615463