Measurement of transmission quality of a telephone channel
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United States of America Patent
Stats
-
Aug 29, 1989
Grant Date -
N/A
app pub date -
Oct 26, 1988
filing date -
Oct 26, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus and method for measuring the transmission quality of a telephone line, for example, a telephone line connected between two voice processing systems. The apparatus includes means for generating a predetermined sequence of DTMF pulses having predetermined amplitude values and for transmitting them over a telephone line; means for receiving DTMF pulses from a telephone line and determining the value of each pulse; means for counting the number of received DTMF pulses; and means for comparing the number with a predetermined threshold value, whereby the telephone line is determined to have acceptable transmission quality if the number exceeds the predetermined threshold value. Further, in a preferred embodiment, the predetermined sequence of DTMF pulses comprises four groups of ten (10) DTMF pulses, each of which groups has succeedingly lower amplitude.
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