Measuring a talking quality of a telephone link in a telecommunications nework
First Claim
1. Method for-measuring a talking quality of a telephone link in a telecommunications network, comprising a main step of subjecting a degraded speech signal s′
- (t) with respect to a talker speech signal s(t) to an objective measurement technique (22), and producing a quality signal (q), wherein the degraded speech signal includes a returned signal r(t), which corresponds to a signal occurring in a return channel of the telephone link during the transmission of the talker speech signal in a forward channel of the telephone link, and said main step includes a step of modelling masking effects in consequence of noise present in the returned signal.
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Accused Products
Abstract
For measuring the influence of noise on the talking quality of a telephone link in a telecommunications network, a talker speech signal (s(t)) and a degraded speech signal (s′(t)) are fed to an objective measurement device (22) for obtaining an output signal (q) representing an estimated value of the talking quality. The degraded signal includes a returned signal (r(t)) originating from the network during transmission of the talker speech signal over the telephone link. The objective measurement carried out by the device is a modified PSQM-like measurement, which is modified as to include a modelling (32b) of masking effects in consequence of noise present in the returned signal. Preferably the modelling includes a noise suppression (42) carried out to a difference signal (D(t, f)) in the loudness density domain using a noise estimation (41).
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Citations
15 Claims
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1. Method for-measuring a talking quality of a telephone link in a telecommunications network, comprising a main step of subjecting a degraded speech signal s′
- (t) with respect to a talker speech signal s(t) to an objective measurement technique (22), and producing a quality signal (q),
wherein the degraded speech signal includes a returned signal r(t), which corresponds to a signal occurring in a return channel of the telephone link during the transmission of the talker speech signal in a forward channel of the telephone link, and said main step includes a step of modelling masking effects in consequence of noise present in the returned signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- (t) with respect to a talker speech signal s(t) to an objective measurement technique (22), and producing a quality signal (q),
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10. Device for measuring a talking quality of a telephone link in a telecommunications network (10), the device comprising measurement means (22;
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31, 36) for subjecting a degraded speech signal s′
(t) with respect to a talker speech signal s(t) to an objective measurement technique, and for producing a quality signal (q),wherein the degraded speech signal including a returned signal r(t), which corresponds to a signal occurring in a return channel of the telephone link during the transmission of the talker speech signal in a forward channel of the telephone link, and the measurement means include means (32b) for a modelling of masking effects in consequence of noise present in the returned signal. - View Dependent Claims (11, 12, 13, 14, 15)
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31, 36) for subjecting a degraded speech signal s′
Specification