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PSB7280

Features: Functions`G.728 compression/decompression (16 kbit/s)`G.722 compression/decompression for 7-kHz audio (64, 56, 48 kbit/s)`G.711 compression/decompression (64 kbit/s)`Digital sampling rate conversion (16 kHz - 8 kHz) for G.722 audio with 8-kHz Codec (bandwidth reduced to 3.4 kHz)` Accepts...

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SeekIC No. : 004465770 Detail

PSB7280: Features: Functions`G.728 compression/decompression (16 kbit/s)`G.722 compression/decompression for 7-kHz audio (64, 56, 48 kbit/s)`G.711 compression/decompression (64 kbit/s)`Digital sampling rate ...

PSB7280 Data Sheet

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Part Number:
PSB7280
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

Functions
 `G.728 compression/decompression (16 kbit/s)
 `G.722 compression/decompression for 7-kHz audio (64, 56, 48 kbit/s)
 `G.711 compression/decompression (64 kbit/s)
 `Digital sampling rate conversion (16 kHz - 8 kHz) for G.722 audio with 8-kHz Codec (bandwidth reduced to 3.4 kHz)
 ` Accepts/outputs uncompressed audio in 8-bit PCM A/m law or 16-bit linear format
 `Uncompressed/compressed audio switchable between different interface combinations (IOM/Serial Audio
    Interface, IOM/Host, Host/Host)
 ` Inband controlled H.221/H.223 oriented audio protocol, e.g. for direct serial connection to videocodec (VCP
     of 8 ´ 8 Inc., formerly IIT Inc.) as well as host based solutions
 `Outband controlled audio protocol with optimized data rate
 ` Stable reaction on interrupt handshake timing violations of e.g. a slow host (Windows® PC)

System On-chip Functions
 ` Two universal serial HDLC/transparent data controllers
 ` IOM-2 monitor and C/I channels
 ` Generation of programmable system clock output
 ` Three programmable timers
 ` Programmable on-chip PLL for internal clock generation from ISDN low frequency (7.68 MHz) clock

Interfaces
 ` 4-line IOM-2/PCM interface
 ` 5-line serial audio interface, e.g. for connection to videocodec/H.221/223 processor
 ` Parallel 8-bit Host interface
 ` 4-line general purpose interface
 ` External memory interface to external SRAM with programmable waitstates (0 to 15), for development
     purposes only.

Control
 ` Programmable via parallel host interface
 ` Operating parameters and mode settings via a register bank
 ` Access to audio channels and HDLC/serial transparent data controllers from DSP or an external host
 ` Interface to external software via a full-duplex 256-byte on-chip mailbox
 `H.221/H.223 oriented inband configuration/mode switching

General
 `Supply voltage: 3.0 - 3.6 V
 `Additional 4.5 to 5.5 V supply for connection to 5-V systems without external

components
 ` Ambient temperature range 0 to + 70  
 ` P-TQFP-100 package


Pinout

Connection Diagram


Specifications

Parameter
Symbol
Limit Values
Units
Ambient temperature under bias
TA
0 to 70
Storage temperature
Tstg
65 to 125
Supply Voltage
VDD
0.5 to 4.2
V
Supply Voltage
VDDA
0.5to 4.2
V
Supply Voltage
VDDP
0.5to 6.0
V
Voltage of pin with respect to ground:
XTAL1, XTAL2,
VS
0.4 to VDDA + 0.5
V
Voltage on any pin with respect to ground
VS
If VDDP < 3 V: 0.4 to VDD + 0.5
If VDDP > 3 V: 0.4 to VDDP + 0.5
V
V
ESD-integrity is 500 V.

Note: Stresses above those listed here may cause permanent damage to the device. Exposure to absolute maximum
         rating conditions for extended periods may affect device reliability.


Description

The PSB7280 Joint Audio Decoder Encoder is a device which implements voice compression algorithms using the Low-Delay Code Excited Linear Prediction (LD-CELP) standard as defined in the ITU-T G.728 Recommendation, and for 7-kHz voice using the Sub-Band Coded Adaptive Differential PCM (SBC-ADPCM) coding according to the G.722 Recommendation. In addition G.711 PCM audio coding is also supported.

Thus in the G.728 mode it compresses a digitized PCM (64 kbit/s) or linear (128 kbit/s) voice signal into a 16 kbit/s bit stream, and vice versa. The algorithm PSB7280 is implemented in 16-bit fixed point arithmetic and complies with the newest fixed point specification set forth by the ITU.

In the G.722 mode PSB7280 compresses the PCM compressed (128 kbit/s) or the linear uncompressed (256 kbit/s) 7 kHz audio samples into a rate of 48/56/64 kbit/s, and vice versa.

The JADE finds applications in PSB7280
   ISDN Videophones (H.320)
   Video Conference Systems
   Corporate Network voice concentrators, multiplexers and gateways
   Data-over-voice and Voice-over-data terminals.

Other potential PSB7280 application areas are:
   Networks (e.g. LANs) for packetized voice
   Digital Added Main-Line (DAML) & Digital Circuit Multiplication Equipment (DCME)
   Voice storage e.g. in PC based applications
   Message recording and distribution.

The PSB7280 interfaces of the JADE allow a seamless integration into IOM-2 based systems.

After the circuit PSB7280 is set up in the proper mode of operation and parameter settings are programmed by a controlling software, the circuit runs independently of the rest of the system. Status and control information to/from the JADE can be transferred either inband the compressed audio data via the corresponding selected interface or outband using an 8-bit parallel host interface.

In a Videophone system using the 8 ´ 8 (formerly IIT) VCP (Video Codec and Multimedia Communications Processor) the Siemens PSB 7280 can work standalone without the need of external initialization. The default configuration of the JADE is such, that no host is needed in this case and the full communication is done between the VCP and the
Siemens PSB7280.

The voice compression algorithms PSB7280 are implemented by an embedded 16-bit fixed point Digital Signal Processor with all memories internal and no external memory needed.




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