PSB7230

Functions
G.723 V5.1 Compression/Decompression (6.3, 5.3 Kbit/s)
Accepts/outputs uncompressed audio in 8-bit PCM A/m law or 16-bit linear format
G.711 Compression/Decompression (64 Kbit/s)
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 X 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
One universal serial transparent data controller
IOM-2 Monitor and C/I channels
Generation of programmable system clock output
Interfaces
4-line IOM-2/PCM interface (programmable master or slave)
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
Control
Programmable via Parallel Host Interface
Operating parameters and mode settings via a register bank
Access to audio channels and serial transparent data controller 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 °C to + 70 °C
P-TQFP-100 package

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.

The PSB7230 Joint Audio Decoder Encoder for Analog Videophones (JADE AN) is a device which implements voice compression algorithms using the Algebraic Code Excited Linear Prediction (ACELP) and the Multi-Pulse Maximum Likelihood Quantization (MP-MLQ) standard as defined in the ITU-T G.723 Recommendation. In addition G.711 PCM audio coding is also supported.

Thus, in G.723 mode PSB7230 compresses the PCM (8 bit A-/m-law) or 16 bit linear voice signal into 5.3 Kbit/s (ACELP) or 6.3 Kbit/s (MP-MLQ) bit stream, and vice versa. The implementation complies with the newest ITU-T C-code V5.1 and includes the G.723 Annex A (Voice Activity Detection and Comfort Noise Generation).