PCF5083HSLASH001SLASHF2 datasheet(49/136 Pages) PHILIPS

49 / 136 page

1996 Oct 29

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”.

PARM

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).

RESD,

RESE

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.

OFFSET

SAMPLE FIELD

PARM FIELD

RESD FIELD

audio sample 0

RESE

not used

RESD

audio sample 1

not used

2 to 27

audio samples 2 to 27

audio sample 28

BM1

BM0

audio sample 29

−

SP_R

audio sample 30

audio sample 31

32 to 157

audio samples 32 to 157

158

audio sample 158

D258

D257

159

audio sample 159

D260

D259

RESD

PCF5083H/001/F2 数据表(PDF) 49 Page - NXP Semiconductors

PCF5083H/001/F2 数据表(HTML) 49 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载