Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent
1988-07-08
1989-07-11
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
With blocking of normal usage
379 21, 379 24, 379 27, H04M 124
Patent
active
048478857
ABSTRACT:
The central unit (14) comprises a distortion sampler (16) including a spectral sound analyzer and a memory for recording the digital data of at least one reference sound. The central unit by means of the analyzer analyzes a sequence of such sounds which are received by way of the telephone line (11, 13) and makes a comparison with the recorded data. It thus produces a measurement of the frequency response of the transmission, that is to say distortion and attenuation introduced by the telephone connection, in accordance with the various frequencies. The data of that measurement are used by the central unit (14) to compensate for the signals which are successively received by way of the activated telephone connection. The system comprises a portable acoustic device (35) in which the digital data of the reference sound are recorded. That device may be connected to any telephone apparatus (12) of the network and comprises a manual control for triggering transmission to the central unit (14) of the sequence of reference sounds after the telephone connection has been established by means of the telephone apparatus (12 ). The portable device (35) may also have a recording of a code for identifying the user, for example, for use in a vocal postal system. In addition in a system in which the central unit (14) comprises a voice recognition device (17) the portable device (35) may have the recording of a series of phonetic prototypes, or phonemes, which are specific to the particular user, to be transferred to the central unit to improve the quality of recognition of the speech transmitted thereby. Alternatively the phonemes of different users may be recorded in a memory of the central unit (14) and be selected thereby on the basis of identification code.
REFERENCES:
patent: 4401860 (1983-08-01), Walls
Ing. C. Olivetti & C. S.p.A.
Schreyer Stafford D.
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