Technique for improved subjective performance in a communication

Details Technique for improved subjective performance in a communication Technique for improved subjective performance in a communication

1988-06-20

1989-09-05

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

H04J 317

Patent

active

048645613

ABSTRACT:
The present invention relates to a method for providing noise fill in a communication system. The method comprises the detecting (16) of active and inactive information signal transmission periods to a destined end user, and the measuring (17) of background noise normally found in the transmission of the information signals to the destined end user. A noise fill signal is generated (21,22) and transmitted to the destined end user during information signal transmission gaps to that end user, which noise fill signal is at level below that of the measured background noise. Such attenuated noise fill level was found to provide improved subjective performance in, for example, speech transmissions when the noise fill is between -dB and -6 dB of the measured background noise level, with best subjective performance noted between the -3 and -6dB noise match levels. During inactive information signal transmission periods to the end user, the transmission channel can be used to transmit second signal transmissions to a second end user using a speech interpolation technique.

REFERENCES:
patent: 4059730 (1977-11-01), Messerschmitt et al.
patent: 4408324 (1983-10-01), Black et al.
patent: 4482998 (1984-11-01), Marouf et al.
patent: 4630304 (1986-12-01), Borth et al.
Reuther et al., ICC'81, Denver, Colo., June 14-18, 1981, vol. 3, pp. 49.6.1-5.
Easton et al., IEEE Trans. On Comm., vol. COM-30, No. 4, Apr. 1982, pp. 803-807.

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