PSB4860 Просмотр технического описания (PDF) - Siemens AG

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производитель

PSB4860

Digital Answering Machine with Full Duplex Speakerphone SAM EC

Siemens AG 

PSB 4860

Functional Description

Table 8 Automatic Gain Control Parameters

Parameter # of Bytes Range

Comment

AG_INIT 1

-95 dB to 95dB

Initial AGC gain/attenuation

COM

1

0 to – 95 dB

Compare level rel. to max. PCM-value

AG_ATT 1

0 to -95 dB

Attenuation range

AG_GAIN 1

0 to 95 dB

Gain range

AG_CUR 1

-95 dB to 95 dB

Current gain/attenuation

SPEEDL 1

0.25 to 62.5 dB/s

Change rate for lower levels

SPEEDH 1

0.25 to 62.5 dB/s

Change rate for higher levels

NOIS

1

0 to – 95 dB

Threshold for AGC-reduction

by background noise

LP

1

0.025 to 16 ms

AGC low pass time constant

Note: There are two sets of parameters, one for AGCX and one for AGCR.

Note: By setting AG_GAIN to 0 dB a limitation function can be realized with the AGC.

2.1.3.7 Fixed Gain

Each signal path features an additional amplifier (LGAX, LGAR) that can be set to a fixed

gain. These amplifiers should be used for the basic amplification in order to avoid

saturation in the preceding stages. Table 9 shows the only parameter of this stage.

Table 9 Fixed Gain Parameters

Parameter # of Bytes Range

Comment

LGA

1

-12 dB to 12 dB always active

2.1.3.8 Mode Control

Table 10 shows the registers used to determine the signal sources and the mode.

Table 10 Speakerphone Control Registers

Register # of Bits Name

Comment

SCTL

1

ENS

Echo suppression unit enable

SCTL

1

ENC

Echo cancellation unit enable

SCTL

1

MD

Speakerphone or loudhearing mode

SCTL

1

AGX

AGCX enable

Semiconductor Group

40

10.97

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