System for measuring and automatically compensating for the distorsions of a connection between a telephone apparatus and a central voice processing unit
First Claim
1. A system for measuring and automatically compensating for the distortions of a connection between a telephone apparatus (12) and a central voice processing unit (14) for a telephone network comprising at least one telephone line (11), characterised in that the central unit (14) comprises measuring means (16) which are activatable after a telephone connection has been established on the said line (11), for measuring the distortion introduced in the transmission by the telephone line, and compensation means (30, 34) controlled by the measuring means (16) for compensating for the distortion.
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Accused Products
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.
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Citations
21 Claims
- 1. A system for measuring and automatically compensating for the distortions of a connection between a telephone apparatus (12) and a central voice processing unit (14) for a telephone network comprising at least one telephone line (11), characterised in that the central unit (14) comprises measuring means (16) which are activatable after a telephone connection has been established on the said line (11), for measuring the distortion introduced in the transmission by the telephone line, and compensation means (30, 34) controlled by the measuring means (16) for compensating for the distortion.
Specification