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information about the owner of this website Technical publications by Joe Rothweiler a consultant in the field of Digital Signal Processing: Filters, Speech, etc. Most are from IEEE journals and conference proceedings. This is my personal web page; I use it to provide convenient access to things I have written that are publicly available.
My consulting company is Sensicomm LLC I am now working as a consultant, using the name Sensicomm LLC. http://www.sensicomm.com

Land Mobile Radio

On Aug 19 2016 I gave a presentation at the "Enhanced Digital Land Mobile Radio Seminar." Slides are now posted on Github, at joe1505.github.io/talks/index.html

You can leave comments at the corresponding blog post: sensicomm.blogspot.com/2016/08/presentation-codecs-for-land-mobile.html


My wife's college roomate is heavily involved with a nonprofit organization, Mission Lazarus in Honduras. In April 2010 we went with a group to see the facility and help out. Videos and links here: www.rothweiler.us/honduras2010

In 2014 we were part of a group that went to Guatemala for an economic development project. www.rothweiler.us/guatemala-2014.


Start of section describing ways to compute line spectrum pairs Computing Line Spectrum Pairs. Line Spectrum Pairs (or Line Spectrum Frequencies) are a parameter set that is frequently used in speech coding applications. I have two publications that together describe an efficient way to transform an all-pole model of speech to the LSP/LSF representation. See www.myown1.com/joe/lsf

Polyphase Quadrature Filters. This is a technique for efficiently filtering a signal into multiple bands and then recombining the bands to recover the original signal. A description, including the original paper, is here.
Other publications. Other publications include an implementation of the Prime Factor version of the Fast Fourier Transform, as well as papers and patents on speech coding and other signal processing techniques. Some info about the PFA is available on the family website www.myown1.com/joe/index.html


  1. D. Klose, T. Baird, D. Hampel, and J. Rothweiler, "An LSI FFT Signal Detection and Demodulation Processor," Proc. Government Microcircuit Applications Conference, pp. 222-225, Nov. 1976.
  2. Joseph Rothweiler, A New Procedure for Calculating Dipolar Sources of EEG Discharges, M. Eng Thesis, University of Louisville, Dec. 1977.
  3. J. H. Rothweiler, J. L. Bradshaw, and N. A. Macina, "Investigation of CCD Application to Multichannel Receiver Design," Proc. National Telecommunications Conference, p. 2.4.1 - 2.4.4, Nov. 1979. Reprinted in Proc. National Aerospace and Electronics Conference, pp. 237 - 240, May 1980.
  4. R. F. H. Farag and J. H. Rothweiler, "Signal Processing and Pattern Recognition for Intelligent Sensors," presented at the Workshop on Digital Signal and Waveform Analysis, Pattern Recognition and Image Processing Conference, Dec 1980.
  5. J. H. Rothweiler, "Implementation of the In-Order Prime Factor Transform for Variable Sizes," IEEE Trans. on Acoustics, Speech, and Signal Processing, pp. 105-107, Feb. 1982.
  6. J. H. Rothweiler, "Polyphase Quadrature Filters - A New Subband Coding Technique," Proc. 1983 International Conference on Acoustics, Speech, Signal Processing, Boston, MA, pp. 1280 - 1283.
  7. J. Rothweiler and J. Carmody, "A Multiple Rate Low Rate Voice CODEC," Proc. 1985 International Conference on Acoustics, Speech, and Signal Processing, Tampa, FL, pp. 248-251.
  8. J. Carmody and J. Rothweiler, "Speech Coding at 800 and 400 Bits per Second," Electrical Communication, Vol. 59, No. 3, pp. 260-265, 1985.
  9. J. Rothweiler and J. Bertrand, "Low Bit Rate Speech Transmission," MILCOM-85, Boston, MA, pp. 56-59, Oct. 1985.
  10. J. Rothweiler, "Performance of a Real Time Low Rate Voice CODEC," Proc. 1986 International Conference on Acoustics, Speech, and Signal Processing, Tokyo, Japan, pp. 3039-3042. Reprinted in Proc. AFCEA Tactical Communications Conference, Ft. Wayne, IN, Apr. 1986.
  11. J. Rothweiler, "Application of Speech Coding to Military Communications Systems," Proc. Speech-Tech 88, New York, NY, pp. 215-216, Apr. 26-28, 1988.
  12. J. Rothweiler and Y.-J. Liu, "Low Rate Voice Algorithm for HF ECCM Applications," Proc. Military Speech-Tech 88, San Francisco, CA. pp. 79-83, Sep. 14-16, 1988.
  13. J. Rothweiler, "Performance Testing Issues in Low Rate Voice Coding," Presented at "1989 Test & Evaluations of Digital Speech Communications Systems Workshop", Hanscom AFB, Bedford, MA, March 21-22, 1989.
  14. Y. J. Liu and J. Rothweiler, "A High Quality Speech Coder at 400 BPS," Proc. ICASSP-89, Glasgow, Scotland, pp. 204-206, May 23-26, 1989.
  15. J. Rothweiler, "A Noise-Robust 1200 bps voice coder," Proc. IEEE Workshop on Speech Coding for Telecommunications, Whistler, BC, Canada, pp. 58-59, Sep. 11-13, 1991.
  16. J. Rothweiler, "Noise-Robust 1200 BPS Voice Coding," Proc. 1992 Tactical Communications Conference, Ft. Wayne, IN, pp. 65-69, Apr. 28-30, 1992.
  17. T.S. Sun, S. Nandkumar, J. Carmody, and J. Rothweiler, "Speech Enhancement Using a Ternary- Decision Based Filter," Proc. ICASSP-95, Detroit, MI, pp. 820-823, May 1995
  18. C. Faller, R. Haimi-Cohen, P. Kroon, and J. Rothweiler, "Perceptually-Based Joint-Program Audio Coding," Proc. 113th Audio Engineering Society Convention, October 5-8, 2002, Los Angeles, CA, USA.
  19. Joseph Rothweiler, "A Testbed for Voice-Based Robotic Control," Proc. 2008 IEEE Conf. on Practical Applications of Robotic Technology (TePRA), November 2008, Boston MA, USA.


4,691,292 Joseph H. Rothweiler, System for Digital Multiband Filtering", Filed Apr. 13, 1983, Issued Sep. 1, 1987. Assigned to RCA Corporation, Princeton, NJ.

4,975,956 Yu J. Liu and Joseph Rothweiler, Low-Bit-Rate Speech Coder Using LPC Data Reduction Processing", Filed July 26, 1989, Issued Dec. 4, 1990. Assigned to ITT Corp.

5,012,518 Yu J. Liu and Joseph Rothweiler, Low-Bit-Rate Speech Coder Using LPC Data Reduction Processing", Filed Aug. 16, 1990, Issued Apr. 30, 1991. Assigned to ITT Corp.

5,649,051 Joseph Rothweiler, John Carmody, and Srinivas Nandkumar, Speech Coder Using LSF Conversion and Low- Bit-Rate Encoding", Filed June 1, 1995., Issued July 15, 1997. Assigned to Martin Marietta Corp.

To contact me, you can send email to joe.nospam.1@myown1.com (Yes, it's a valid email address, exactly as written).

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© 2002-2009 Joseph Rothweiler
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