Date of Last Update : 16 May 1995 List of ITU-T P-Series Recommendations in force ** - Series P * Vocabulary and effects of transmission parameters on customer opinion of transmission quality P.10 (1993) [Rev.1] [15 pp.] [Publ.: Jun.94] Vocabulary of terms on telephone transmission quality and telephone sets P.11 (1993) [Rev.1] [32 pp.] [Publ.: Sep.94] Effect of transmission impairments P.16 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Subjective effects of direct crosstalk thresholds of audibility and intelligibility * Subscribers' lines and sets P.30 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Transmission performance of group audio terminals (GATs) P.31 (1993) [Rev.1] [7 pp.] [Publ.: Jul.94] Transmission characteristics for digital telephones P.32 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Evaluation of the efficiency of telephone booths and acoustic hoods P.33 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Subscriber telephone sets containing either loudspeaking receivers or microphones associated with amplifiers P.34 (1993) [Rev.1] [8 pp.] [Publ.: Jul.94] Transmission characteristics of hands-free telephones P.35 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Handset telephones P.36 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Efficiency of devices for preventing the occurrence of excessive acoustic pressure by telephone receivers P.37 (1993) [Rev.1] [6 pp.] [Publ.: Jul.94] Coupling hearing aids to telephone sets P.38 (1993) [Rev.1] [2 pp.] [Publ.: Apr.94] Transmission characteristics of operator telephone systems (OTS) * Transmission standards P.48 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Specification for an intermediate reference system * Objective measuring apparatus P.50 (1993) [Rev.1] [15 pp.] [Publ.: Jul.94] Artificial voices P.51 (1993) [Rev.1] [7 pp.] [Publ.: May.94] Artificial mouth P.52 (1993) [Rev.1] [3 pp.] [Publ.: Mar.94] Volume meters P.53 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Psophometers (apparatus for the objective measurement of circuit noise) Note - Same as O.41 P.54 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Sound level meters (apparatus for the objective measurement of room noise) P.55 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Apparatus for the measurement of impulsive noise P.56 (1993) [Rev.1] [12 pp.] [Publ.: Jul.94] Objective measurement of active speech level P.57 (1993) [New] [12 pp.] [Publ.: Jul.94] Artificial ears P.58 (1993) [New] [25 pp.] [Publ.: Sep.94] Head and torso simulator for telephonometry P.59 (1993) [New] [4 pp.] [Publ.: Jun.94] Artificial conversational speech * Objective electro-acoustical measurements P.61 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Methods for the calibration of condenser microphones P.62 (1993) [Rev.1] [2 pp.] [Publ.: Mar.94] Measurements on subscribers' telephone equipment P.63 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Methods for the evaluation of transmission quality on the basis of objective measurements P.64 (1993) [Rev.1] [18 pp.] [Publ.: Sep.94] Determination of sensitivity/frequency characteristics of local telephone systems P.65 (1993) [Rev.1] [5 pp.] [Publ.: Jun.94] Objective instrumentation for the determination of loudness ratings P.66 (1993) [Rev.1] [12 pp.] [Publ.: Sep.94] Methods for evaluating the transmission performance of digital telephone sets * Measurements related to speech loudness P.75 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Standard conditioning method for handsets with carbon microphones P.76 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Determination of loudness ratings fundamental principles P.78 (1993) [Rev.1] [15 pp.] [Publ.: Jul.94] Subjective testing method for determination of loudness ratings in accordance with Recommendation P.76 P.79 (1993) [Rev.1] [27 pp.] [Publ.: Oct.94] Calculation of loudness ratings for telephone sets * Subjective opinion tests P.80 (1993) [Rev.1] [21 pp.] [Publ.: Jul.94] Methods for subjective determination of transmission quality P.81 (1993) [Rev.1] [5 pp.] [Publ.: Jun.94] Modulated noise reference unit (MNRU) P.82 (1988) [Blue Book Fasc. V] [Publ.: Apr.89] Method for evaluation of service from the standpoint of speech transmission quality P.83 (1993) [New] [15 pp.] [Publ.: Oct.94] Subjective performance assessment of telephone-band and wideband digital codecs P.84 (1993) [Rev.1] [19 pp.] [Publ.: Jul.94] Subjective listening test method for evaluating digital circuit multiplication and packetized voice systems P.85 (06/94) [New] [9 pp.] [Publ.: Feb.95] A method for subjective performance assessment of the quality of speech voice output devices Note - C: 41/67/85 ---------------------------------------------------------------------- Some 1120 Recommendations from the Blue Book are still in force. They are included in fascicles and volumes of the Blue Book that may still be purchased from the ITU Sales Service. Since the beginning of the 1988-1993 Study Period ("post Blue Book") ITU-T Recommendations are published and offered for sale individually (in separate fascicles). 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