The ARPA Speech Understanding Research programme

The agency funded a five-year programme with a target: understand continuous speech over a thousand-word vocabulary at acceptable accuracy.

Why it matters

A state programme set speech recognition a measurable goal with a deadline for the first time, and created the habit of evaluated competition.

A study group chaired by Newell recommended bringing six levels of knowledge to bear: acoustic, parametric, phonemic, lexical, sentence and semantic. Carnegie Mellon, BBN, SRI and the System Development Corporation took part. The conditions were strict: continuous speech, several speakers, a restricted domain. That framing produced HEARSAY, DRAGON and HARPY.

Event record

Event date

1971 · Approximate date

Timeline date

Event date

Verification

Sources gathered automatically · September 17, 2026

Lines

ID

evt-0184

The programme began in 1971 on the recommendation of a study group chaired by Newell and ran to 1976. Sources do not give a start month.

Sources

primary Speech Understanding Systems: Summary of Results of the Five-Year Research Effort
Carnegie Mellon University · Published 1977
primary Multi-System Approach to Speech Understanding (Raj Reddy)
NASA Technical Reports Server (paper in a proceedings on voice technology for command and control systems)
secondary A Historical Perspective of Speech Recognition
Communications of the ACM · Published January 2014

Related events

Earlier

Related Section 203: research must serve a military purpose 1969links to this record
ARPA's speech understanding programme was launched in 1971, after the law had put a military-relationship test on defence research money. The documents name no causal link.
Related The ALPAC report 1966
The agency returned to language five years after the ALPAC report stopped machine translation.

Later

Related DRAGON 1975links to this record
The work was done inside the ARPA programme.
Extends HARPY 1976links to this record
The system met the goal the programme set: a thousand words of continuous speech.
- The Harpy Speech Recognition System · Carnegie Mellon University
Extends The end of ARPA SUR: Harpy against the 1971 goals 1976links to this record
The CMU report compares the result directly with the list of goals that Newell's group proposed in November 1971 for this programme and gives five years as its length.
- Speech Understanding Systems: Summary of Results of the Five-Year Research Effort at Carnegie-Mellon University (CMU Department of Computer Science; first version September 1976, present version August 1977; DTIC ADA049288) · Carnegie-Mellon University, Department of Computer Science, for the Defense Advanced Research Projects Agency (copy: Internet Archive, DTIC collection)
Related The HEARSAY-II blackboard 1980links to this record
The paper sums up the architecture worked out inside the ARPA programme.