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Abstract
An extensive series of measurements of speech intelligibility of voice modems designed for a satellite relay link to air and sea‐going craft has been underway since 1973. Measurement parameters for these tests are the system functions associated with ATS‐6 satellite L‐band and C‐band transmission. These include comparative evaluations of intelligibility versus C/N0, angle of elevation, antenna systems, range, and sea‐state. For these tests, a number of modifications and adaptations of standard intelligibility testing procedures were developed. These include using a large number of scramblings of the PB‐50 word lists (ANSI S3.2‐1960) recorded by four professional talkers, two male and two female, in an anechoic room. Because of time considerations in conducting the flight tests, the lists were recorded at a reading rate of 2.5 sec with no carrier phrase Experiments showed that highly trained listeners [P. Milner, “Advantages of Experienced Listeners in Intelligibility Testing,” IEEE Trans. Audio Electroaco...
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