Download ARIB STD-T64-C.S0018-E v2.0 Minimum Performance Specification

3GPP2 C.S0018-E v2.0
1
3.5.2.4
P.341 Tx Filter
3
The software utility “p341_tx.c” can be compiled to yield a Tx filtering utility p341_tx with usage
defined as:
4
p341_tx input-file-name output-file-name
2
5
6
7
8
9
10
11
where p341_tx is the 3GPP2 Tx filter compliant to ITU-T P.341. Figure 3.5.2.4-1shows the frequency
response of “p341_tx” filter. Also shown in this figure is the response of the ITU-T P.341 STL-2000
filter implementation, as well as the transmit masks for the ITU-T P.341/P.311 and the wideband
transmit response from Table 9 in the 3GPP electro-acoustics specification [21]. From this figure, it
can be seen that the STL-2000 filter response (in red) does not meet the frequency response of the
3GPP electro-acoustics specification, while the p341_tx filter response (in green) meets both the
P.341/P.311 masks as well as the 3GPP electro-acoustics specification mask.
12
Figure 3.5.2.4-1 SO 77 ITU-T P.311/P.341 Transmit Mask and Filter responses
13
14
3.5.3
15
This section describes the C simulation of the speech codec specified by [1]. The master codec C
simulation used for verifying the performance of a non-bit-exact EVRC-NW2K implementation shall be
the floating-point master C simulation included in the associated Software Distribution [1a].
16
17
Master Codec for SO 77
3-48