This paper describes two new algorithms to convert a uniformly sampled sequence into a naturally sampled pulse-width modulation (NPWM) signal. They are suitable for both single- and double-edge NPWM. Single-edge algorithm A requires nine additions and seven multiplications per output sample and achieves a total harmonic distortion (THD) of -88.48 dB when the input signal is a 6.66-kHz tone upsampled 8 times. Single-edge algorithm B requires 14 additions, 11 multiplications, and one comparison per output sample and yields -113.07 dB of THD under the same conditions. Intermodulation distortion is very low for both algorithms. Polynomial interpolation methods with the same degree of accuracy are computationally more expensive. The algorithms have enabled the implementation of digital audio amplifiers performing efficient real-time digital signal processing.:
Authors:
Pascual, César; Roeckner, Bill
Affiliations:
University of Illinois, Urbana-Champaign, IL ; Motorola Labs, Schaumburg, IL(See document for exact affiliation information.)
AES Convention:
109 (September 2000)
Paper Number:
5198
Publication Date:
September 1, 2000
Subject:
Analog Signal Processing
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.