IEEE 269-2002 pdf download IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets
3.3 acoustic input: The free-field sound pressure level developed by a mouth simulator at the mouth
reference point. See also: sound pressure level.3.4 acoustic output: The sound pressure level developed in an ear simulator. See: sound pressure level3.5 analog telephone set: A telephone set in which the two-way voice communication interface to thenetwork is in an analog format.
3.6 boom microphone position (BMP): The default point at which to place a boom microphone fortesting on a mouth simulator, It is specified as measurement point #21 in ITU-T RecommendationP58-1996. With respect to the intersection of the mouth reference axis with the lip planc, it is located6mm back towards the mouth, 42 mm to the right (or left), and 9mm downward.
3.7 codec: A combination of an analog-to-digital encoder and a digital-to-analog decoder operating inopposite directions of transmission within the same equipment
3.8 dBA: Sound pressure level in decibels, relative to 20pPa (micropascals), A-weighted. See:A-weighted.
3.9 dBm: Power level in decibels, relative to a power of 1 mW (milliwatt).
3.10 dBm0: Power level in dBm, relative to a reference point called the zero transmission level point, or0 TLP. (See 3.52.) A signal level of X dBm at the 0 TLP is designated X dBm0. In a codec, the 0 TLP isspecified in relationship to the full-scale digital level or saturation. However, digital saturation isgenerally not 0 dBm0. For p-law codecs 0 dBm0 is 3.17 B below digital full scale, For A-law codecs 0dBm0 is 3.14 dB below digital full scale.
3.11 dBm(A): Power level in decibels, relative to a power of lmW (milliwatt), A-weighted. See:A-weighted.
3.12 dBmp: Power level in decibels, relative to a power of 1mW (milliwatt), measured withpsophometric weighting defined in ITU-T Recommendation O.41-1994.
3.13 dBPa: Sound pressure level in decibels, relative to a sound pressure of 1 Pa (pascal).
3.14 dBSPL: Sound pressure level in decibels, relative to a sound pressure of 20 pPa (micropascals).
3.15 dBV: Voltage level in decibels, relative to I V (volt) rms.
3.16 dBV(A): Voltage level in decibels, relative to I V (volt) rms, measured with A-weighting. SeeA-weighted.
3.17 dBV(p): Voltage level in decibels, relative to 1V (volt) rms, measured with psophometricweighting defined in ITU-T Recommendation O.41-1994.
3.18 digital telephone set: A telephone set in which the two-way voice communication interface to thenetwork is in a digital format.
3.19 ear-cap reference point: The intersection of the external ear-cap reference plane with a normal axishrough the efective acoustic center of the sound outlet ports. Generally, the acoustic center of thesound outlet ports is at the center of their distribution
3.20 ear-reference point: A virtual point for geometric and acoustic reference located outside theentrance to the ear canal, The exact location is specifed for each type of ear simulator.
3.21 feed circuit: An electrical circuit for supplying dc power to a telephone set and an ac path betweenthe telephone set and a terminating circuit.
IEEE 269-2002 pdf download
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