PSB21373HV11XT Infineon Technologies, PSB21373HV11XT Datasheet - Page 108

Manufacturer Part Number

PSB21373HV11XT

Description

Manufacturer

Infineon Technologies

Type

PCMr

Datasheet

1.PSB21373HV11XT.pdf (242 pages)

Number Of Channels

Number Of Adc's

Number Of Dac's

Number Of Adc Inputs

Pin Count

Mounting

Surface Mount

Lead Free Status / RoHS Status

Compliant

PSB 21373

4.2

Signal Processor (DSP) Description

The signal processor (DSP) has been conceived to perform all ITU-T and ETSI (NET33)

recommended filtering in transmit and receive paths and is therefore fully compatible to

the ITU-T G.712 and ETSI (NET33) specifications. The data processed by the DSP is

provided in the transmit direction by an oversampling A/D-converter situated in the

analog front end (AFE). Once processed, the speech signal is converted into an 8-bit A-

law or -law PCM format or remains as a 16-bit linear word (2s complement) if the

compression stage is bypassed. In the receive direction, the incoming PCM data is

expanded into a linear format (if the linear mode is selected, the expansion logic is

bypassed) and subsequently processed until it is passed to the oversampling D/A-

converter.

Additionally to these standard codec functions an universal tone generation unit and a

high quality speakerphone function is provided. Figure 58 shows the processor signal

flow graph which illustrates the following description of the signal processing in receive

and transmit direction, the tone generation and speakerphone function.

Data Sheet

108

2002-05-13