Coustic XM6 Manuel d'utilisateur télécharger pdf (Page 36)

To be ANSI/TIA-470.130-C

5.5.5 Headset Receive Distortion 611

5.5.5.1 Headset Receive Amplitude Normalized Total Harmonic Distortion (ANTHD) 612

Receive distortion has previously been specified as THD, but to eliminate the effects of the receive 613

frequency response, ANTHD is used in this document. 614

The receive volume control shall be set at the reference setting. For the increased receive volume 615

measurement, the control shall be set to its +12 dB Volume Control Setting. The THD of the signal 616

source shall be less than 0.5% for signals of -16 dBV and shall be less than 1.0% for signals of -1 617

dBV. 618

The receive ANTHD values with 0 km and 4.6 km artificial lines shall be determined at each of the 619

listed frequencies and shall be less than the values listed in Table 11. 620

621

Table 11 – Headset Receive ANTHD requirements 622

RETP Input Level

Frequency

[Hz]

-16 dBV at the

Reference Volume

Control Setting

-16 dBV at the

+12 dB volume

control setting

-1 dBV at the

Reference Volume

Control Setting

300 5% 10% n/a

500 5% 10% 10%

800 5% 10% n/a

1000 5% 10% 10%

623

5.5.5.2 Receive ANTHD with a Parallel set 624

At the Reference Volume Control Setting the receive ANTHD values for 0 km, and 4.6 km artificial 625

lines shall not exceed 10% for 500 Hz and 1000 Hz, using –16 dBV as the nominally loaded 626

generator level, with the CPE Load Simulator connected in parallel with the set under test. Note: 627

This requirement only applies to CPE that are designed to operate only with a headset (no support for 628

a handset). 629

630

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 58 59

Pas de commentaire

Coustic XM6 Manuel d'utilisateur Page 36