PCF5083HSLASHF2 datasheet(85/136 Pages) PHILIPS

85 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

SP_decoder_TCHFS_init

Initialization of SP_decoder_TCHFS.

−−

SP_encoder_TCHFS

GSM full-rate speech encoder as deﬁned in

“GSM Rec. 06.01, 06.10, 06.11, 06.12, 06.31 and 06.32”. The following

tasks are performed.

Speech encoding algorithm.

Voice Activity Detection (VAD) algorithm in the event of discontinuous

transmission (DTX).

Integrated handsfree algorithm using a weighting balance and comfort

noise insertion.

The 160 words audio input data in SCRATCH_BUFF (see Table 36) are

processed. The encoded speech parameters are returned in

SCRATCH_BUFF.

The dtx_ﬂag enables or disables DTX as deﬁned below:

dtx_ﬂag = 1 enables DTX.

dtx_ﬂag = 0 disables DTX.

If test_mode = 2 (test of speech encoder) then the RESE bit in

SCRATCH_BUFF is checked. If a rising edge is detected, the internal state

variables are cleared.

If bypass ﬂag = 1; it disables the speech encoder. In this case the

parameter bits D1 to D260 (see Table 36) are directly passed to the output.

If bypass ﬂag = 2; the speech encoder is only bypassed, if the control ﬂag

BM0 (see Table 36) is set to 1 and BM1 is set to 0, otherwise the speech

coder is executed. This mode is required for remote interrogation of an

external answering machine.

dtx_ﬂag

test_mode

bypass_ﬂag

−

SP_encoder_TCHFS_init

Initialization of SP_encoder_TCHFS.

−−

TG_tone_gen

This procedures adds a tone consisting of up to 3 sine waves to the audio

signal located in SCRATCH_BUFF, whereby the 3 LSB’s remain

unchanged (see Section 9.1.4). For more information refer to

TG_tone_gen_init.

−−

DESCRIPTION

PARAMETERS

RETURN

VALUES

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