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7-bit coder acoustic impedance acoustic pressure amplitude Annex artificial ear artificial mouth balance return loss C.C.I.T.T. Laboratory calculated carbon microphone centre clipping characteristic circuit noise continuation of Question Contribution corresponding crosstalk dBm0 document COM XIIóNo echo suppressors effect electric electric impedance electroacoustic attenuation encoding law evaluation frequency gaussian handset image attenuation increase input signal large number line attenuation mean opinion score mean power measurement methods microphone capsules multiplex system noise power normal Note objective measurement obtained output p.c.m. system probability distribution quantization distortion Question 15/XII ratio receiving reference equivalent Recommendation Red Book return loss room noise sending and receiving sending reference equivalent sensitivity shown in Figure sound pressure speech signal speech sounds speech volume statistical statistically independent Study Group XII subjective tests subscriber's set symmetrical binary code tion transmission performance transmitted trunk types United Kingdom Administration users