Dave Walden(1942-)，programmer; member of the IMP Guys team at BBN; co-wrote the operating code for the Interface Message Processor and was responsible for IMP-to-host issues; worked with Frank Heart and Will Crowther at Lincoln Lab on real-time computer systems in 1950s and early 1960s.
个人简介编辑本段回目录
After 27 years, I “retired” from Bolt Beranek and Newman Inc. (BBN) in 1995. I had joined BBN in 1967 after three years at MIT Lincoln Laboratory and, except for a year in 1970-71, spent the rest of my business career with BBN, first as a computer programmer, then as a technical manager, and then as a general manager. At BBN, I had the good fortune to be involved in the beginnings of the Internet.
Over the next four years, after my retirement from BBN, I spent a little time with the Center for Quality of Management (CQM) and a little time with the Leaders for Manufacturing Program at MIT. The CQM web site included a photo of what I looked like as of a few years ago and other information relating to my participation in the CQM.
Dave WaldenThese days I mostly look out the window at the salf marsh near my home.
Looking out the window from our kitchen
Click for view from outside dining room window
Click for view of front of house (away from marsh)
In 1998 I was pleased to be named to the hall of fame of my undergraduate college, San Francisco State, for having been involved in the early days of the Internet. My friend and classmate Stan Mazor — who was co-inventor of the micro-computer — went into my college hall of fame at the same time. This is among Stan’s lesser honors and my only honor. (I love being on the same list as Annette Benning and Danny Glover, among others — see full SFSU Hall of Fame list; I'm also listed with other notable alumni (under category 2 -- Science and Technology); and I was mentioned in SFSU Magazine, Vol. 1, No. 2, Spring 2001.)
More information about the early era of the Internet when I was involved can be found in the following books:
Where Wizards Stay Up Late by Katie Haffner and Matthew Lyon
Nerds 2.0.1 by Stephen Segaller which was the companion volume to the PBS TV show of the same name
Casting the Net by Peter Salus
Rescuing Prometheus by Thomas Hughes.
A Brief History of the Future: the origins of the Internet by John Naughton
Transforming Computer Technology: Information Processing for the Pentagon, 1962-1986 by Arthur L. Norberg and Judy E. O'Neill with contributions by Kerry J. Freedman, particularly chapter 4
The Dream Machine by M. Mitchell Waldrop, chapter 7.
In August 1999, the IEEE announced that BBN Technologies had been awarded a IEEE Corporate Innovation Recognition: “For pioneering contributions to computer networking technology through the development of the first packet switches, the ARPANET Interface Message Processor (IMP) and Terminal Interface Message Processor (TIP).” This work was done by a team of engineers and scientists which I had the great fortune to be part of. (Click here for a copy of the widely published photo of the BBN team I was part of, and click here for a more close up view of the IMP and team leader Frank Heart.)
In 2001, the Boston History and Innovation Collaborative honored BBN (and our ARPANET team) and did it again in 2007: click here for more info
frank-and-impMy book Four Practical Revolutions in Management has been included on the Nippon Foundations's list of 100 Books for Understanding Contemporary Japan.
[Note: Much of the information in the conventional and business press about my career since my time as a programmer on the BBN ARPANET team is inaccurate; anyone including something on me in a piece you are writing might query me directly rather than trusting what has been written in the past.]
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Management writing
Over the years, I have written extensively on management topics. Much of my effort in this area was through my affiliation with the Center for Quality of Management and, more recently, my affiliation with the Confederation of Indian Industry:
– The book A New American TQM
– The book Four Practical Revolutions in Management
– The book Breakthrough Management
– The book Visionary Leaders in Manufacturing
– The Journal of the Center for Quality of Management
PDF versions of CQM Journal papers of which I have been sole, primary or real co-author
What Is the Center for Quality Management?
Breakthrough and Continuous Improvement in Research and Development
Thoughts on Goals and Metrics
The Systematic Development of Skill as a Basis for Competitive Product Development
Language for Action: New Concepts to Address Soft Side Management Issues
Understanding Unclear Situations and Each Other Using the Language Processing Method
Task Deployment Management
Designing Integrated Management Systems
Observations from the 1997-98 CQM Study Group on Cycle Time Reduction
A Written Example of A-Delta-T
Creation and Evolution of the CQM
Getting the Most Out of Technologists
PDF versions of CQM Journal papers that I compiled or on which I collaborated, or did a lot of actual writing but chose only to be listed as "editor"
A special issue on Kano’s Methods for Understanding Customer-defined Quality
Mutual Learning: Industry/Academia Collaboration for Improving Product Development
Roundtable Report on a Presentation by Professor Hajime Karatsu
Using the Methods of Fernando Flores
Planning Projects and Tasks Using the 9-Steps
Case Study of Trantex
Reflecting on Obstacles to Innovation---An Example of Using Causal Loops
A special issue in memory of Thomas H. Lee
Biography of Thomas H. Lee
A special issue on Mastering Business Complexity
Complete list of papers published in the CQM Journal during the eleven volumes for which I was editor-in-chief
–Unpublished and to-be-published papers
Designing Effective and Efficient Action [a Word.doc file]
Quality Process Improvements Tools and Techniques (with Shoji Shiba) -- now published as a chapter of Quality Tools and Methods for the 21st Century, edited by Conti, Watson, and Kondo, Salem, NH: GOAL/QPC, 2006.
The Center for Quality of Management (CQM): A US Experiment in Mutual Learning
The BBN IMP Team
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Technical writing
I have also written many technical papers, primarily related to my involvement in computer networking. As time permits or I find them already on the WWW, I'll post them to this web site or link to them. More recently I have been doing a lot of writing on the TeX typesetting system.
The ARPANET Design Decisions, by John McQuillan and me, Computer Networks, Vol. 1, No. 5, August 1977.
RFC 62: A system for interprocess communication in a resource sharing computer network
RFC 65: Comments on Host/Host Protocol Document #1
"RFC 333: Proposed Experiment with a Message Switching Protocol" (with R.D. Bressler and D. Murphy)
RFC 435: Telnet Issues (with Bernie Cosell)
RFC 636: TIP/TENEX Reliability Improvements (with J.D. Burchfiel, B. Cosell, and R.S. Tomlinson)
USER'S GUIDE TO THE TERMINAL IMP
My presentation on the ARPANET to the 1972 AFCET conference in Paris
Technical writing on my "travels in TeX land"
Over the past several years I have published a number of pieces on my on-going experiences while learning and using the TeX typesetting system.
I have given this its own web page:
Travels in TeX Land
That page also has links to other TeX-related activities of mine, including an interview series (including an interview of me conducted by Karl Berry).
CV
A fairly complete list of my published technical (and management) writings is included in my CV
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Musings on the history of the Internet and my computing experiences more generally (and related biographical data)
From San Francisco State University College of Science and Engineering Alumni Newsletter (Fall 1998)
How I stumbled into being involved with the beginnings of the Internet
On my first years of work, at Lincoln Lab and BBN with Frank and Will
On my first two years of "work" at BBN, before I got involved in the ARPANET
Observations on the beginnings of the Internet
Preface for publication of the early BBN Quarterly Technical Reports on the ARPANET project
Reflections on the 25th anniversary of the Internet
Interview relating to the beginning of the ARPANET, on file at the Charles Babbage Institute (Center for the History of Information Processing), recorded 6 February 1990: after clicking on this link, scroll down the page and click on "Walden, David C.", and then scroll down the page and click on "link to transcript"
After three years at BBN, I spent a year in Norway developing the network described in the following paper: Remembering the LFK Network by Nils Liaaen and me in the Anecdotes section (pages 79-81) of the July-September 2002 issue (Vol. 24 No. 3) of the IEEE Annals of the History of Computing. Unfortunately, the copy at the Annals of Computing web site is accessible without charge only to people who have an appropriate IEEE membership (but check the For family, friends, etc., category further down this page). A preprint of the note by Nils and me is available here.
On the rest of my years of "work" at BBN
On losing computer files
Note on writing a big book in LaTeX and then converting it into a format acceptable to the publisher -- this has been submitted for consideration for publication by TUGboat, the journal of the TeX Users Group; if it is published, I will put a link to the published version here
Bernie Cosell and I have written a paper about the creation of Telnet's negotiated options capability. The official published version is at http://www.computer.org/annals/an2003/a2080.pdf.
Some history of the original ARPANET routing algorithm and what it is called today
Looking back at the ARPANET effort, 34 years later
Some Observations and Interpretations of Internet History from 1968 to 1980 -- part of A Technical History of the Internet (an ACM SIGCOMM Tutorial given by 19 voices, speaking for a much larger community) at SIGCOMM 1999, 31 August 1999, Cambridge MA, USA
Ray Nickerson and I were the special issue editors of two special issues of the IEEE Annals of the History of Computing on computer history at BBN
I gave a presentation on the history of the Internet at the Polyteknisk Foreninghttp in Oslo on September 18, 2007. Also presenting were Robert Cailliau (co-inventory of the World Wide Web) and H錵on Wium Lie (CTO of Opera Software and inventory of Cascading Style Sheets for HTML).
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Some other activities of mine
Over my life I have moved serially through a number of hobbies, each one intense for a time, for example, contract bridge, amateur theater, postal chess, juggling, sail boating, and celtic traditional music. I’ve never gotten super good at any of these, but I’ve had a good time. Click here for photos relating to the last three of the above list.
Following are links relating to (a) about my only current heavy-duty recreation, movie going, and (b) what seems to be my current avocation, writing and self-publishing:
Movie going (brief notes on the last 1,000 movies I've seen)
Notes on self-publishing: based on my 2006 experience of publishing Breakthrough Management
A 2009 project to publish a book of interviews: the project is described in a video presentation and in a paper
And, based on the 2009 publishing project, new summary of my self-publishing insight: described in a video presentation and in a paper
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For my family, friends, xBBNers
I have posted on this web site some documents that I prefer not to display to the public at large, because they include names of other people, etc. If you try to access these documents, you will be asked for a userid and password; the username is the letter a and the password is the letter b. Please do not include public links to these documents.
The BBN IMP Team
Our trip to East Africa in 1994
Sailing race to Bermuda in June 2001
Our month in Mexico in October 2001
Our two weeks in Italy in March 2002
Our son and daughter-in-law's September 2002 wedding
Sail to Antigua in October 2002
Our two weeks in Brazil in October 2003
Our nearly three weeks in Paris and Norway in June 2003
Two weeks along the east coast of Florida in January 2007
Ten days in the vicinity of Nice, France, in April 2007
Dave's quick trip to Oslo in September 2007
Our ten day visit to Norway in May-June 2008
A week long business trip to Mumbai, India, in September 2008
Obsolete: Collected thoughts on health insurance when not part of a large group plan, exchanged by xBBNers
Obsolete: Collected thoughts on Long Term Care insurance, exchanged by xBBNers
线性预测编码的早期历史编辑本段回目录
根据斯坦福大学 Robert M. Gray 的说法，线性预测编码起源于 1966 年，当时 NTT 的 S. Saito 和 F. Itakura 描述了一种自动音素识别的方法，这种方法第一次使用了针对语音编码的最大似然估计实现。1967 年，John Burg 略述了最大熵的实现方法。1969 年 Itakura 与 Saito 提出了部分相关（en:partial correlation）的概念, May Glen Culler 提议进行实时语音压缩，B. S. Atal 在美国声学协会年会上展示了一个 LPC 语音编码器。1971 年 Philco-Ford 展示了使用 16 位 LPC 硬件的实时 LPC 并且卖出了四个。
1972 年 ARPA 的 Bob Kahn 与 Jim Forgie (en:Lincoln Laboratory, LL) 以及 Dave Walden (BBN Technologies) 开始了语音信息包的第一次开发，这最终带来了 Voice over IP 技术。根据 Lincoln Laboratory 的非正式历史资料记载，1973 年 Ed Hofstetter 实现了第一个 2400 位/秒 的实时 LPC。1974 年，第一个双向实时 LPC 语音包通信在 Culler-Harrison 与 Lincoln Laboratories 之间通过 ARPANET 以 3500 位/秒 的速度实现。1976 年，第一次 LPC 会议通过 ARPANET 使用 Network Voice Protocol 在Culler-Harrison、ISI、SRI 与 LL 之间以 3500 位/秒 的速度实现。最后在 1978 年，BBN 的 Vishwanath et al. 开发了第一个变速 LPC 算法。
