Measurement of transmission quality of a telephone channel

Details Measurement of transmission quality of a telephone channel Measurement of transmission quality of a telephone channel

1988-10-26

1989-08-29

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

With blocking of normal usage

379 22, 379 32, H04B 346, H04M 332

Patent

active

048624926

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.

REFERENCES:
patent: 4001559 (1977-01-01), Osborne et al.

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