參數(shù)資料
型號： PCF5083
廠商： NXP Semiconductors N.V.
英文描述： STEEL COVER
中文描述： GSM信號處理IC
文件頁數(shù)： 49/136頁
文件大小： 602K
代理商： PCF5083
1996 Oct 29
49
Philips Semiconductors
Objective specification
GSM signal processing IC
PCF5083
9.1.4.2
Uplink Speech Frame Format
Every 20 ms the speech encoder in the DSP requires a speech frame consisting of 160 16-bit words. The speech frame
format is described in Table 36. Each word consists of three fields as shown in Table 35.
Table 35
Field descriptions
Table 36
Uplink speech frame format
FIELD
DESCRIPTION
SAMPLE
This field contains the 13-bit linear PCM audio samples in two’s complement (MSB = sign bit)
representation as defined by the “GSM recommendation 06.01”
If the bypass_flag in SP_encoder_TCHFS procedure (see Section 9.3.1) is set to 1, the speech encoder
is bypassed and the bits D1 to D260 are used as the coded speech frame. If bypass_flag is set to 2, the
speech encoder is only bypassed, if the control flag BM0 is set to 1 and BM1 is set to 0. The SP_R flag
indicates, either a speech frame (SP_R = 1) or a silence frame (SP_R = 0) is transmitted. Before the
external device could send meaningful information, it has to synchronize to the rising edge of the
SYNC bit (see Table 43).
RESet Decoder, RESet Encoder. In test mode (see Section 9.3.1 speech coding procedures) these bits
behave as a reset signal for the speech decoder/encoder on a LOW-to-HIGH transition, RESD/RESE
must remain set for at least 40 ms.
PARM
RESD,
RESE
OFFSET
SAMPLE FIELD
PARM FIELD
RESD FIELD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
1
audio sample 0
audio sample 1
audio samples 2 to 27
audio sample 28
audio sample 29
audio sample 30
audio sample 31
audio samples 32 to 157
audio sample 158
audio sample 159
RESE
not used
RESD
.
.
.
.
.
.
.
.
RESD
not used
2 to 27
28
29
30
31
32 to 157
158
159
BM1
D2
D4
.
D258
D260
BM0
SP_R
D1
D3
.
D257
D259
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