USBB13AP77016-XXX-B06 NEC Electronics, USBB13AP77016-XXX-B06 Datasheet - Page 11

• Manufacturer Part Number: USBB13AP77016-XXX-B06
• Description: DSP middleware(AMR voice CODEC)
• Manufacturer: NEC Electronics

1.1 Middleware
performance of the processor and enables processing that is conventionally performed by hardware to be performed
by software.
to facilitate operation of the environments integrated in the system.
offering users the kind of technology essential in the realization of a multimedia system for the µ PD77016 Family, and
is continuing its promotion of system development.
1.2 AMR Speech CODEC
3GPP (3rd Generation Partnership Project). It includes a multi-rate speech coder, a silence compression function,
and an error concealment function. The multi-rate speech coder enables selection of the bit rate from a total of 8
(refer to Table 1-1), except MRDTX
Middleware is the name given to a group of software that has been tuned so that it draws out the maximum
The concept of middleware was introduced with the development of a new high-speed processor, the DSP, in order
By providing appropriate speech codec and image data compression/decompression-type middleware, NEC is
The AMR speech CODEC is a 4.75 kbps to 12.2 kbps speech compression/decompression codec standardized by
Notes 1.
Remark For details of each standard, refer to the reports in APPENDIX B RELATED DOCUMENTS.
2.
3.
4.
The encoder automatically executes compression in the MRDTX mode if the silence compression
function is set to ON.
GSM EFR: ETSI GSM 06.90 Enhanced Full Rate Speech Codec
IS-641: TIA/EIA IS-641 TDMA Enhanced Full Rate Speech Codec
PDC-EFR: ARIB 6.7 kbps Enhanced Full Rate Speech Codec
MR122
MR102
MR795
MR74
MR67
MR59
MR515
MR475
MRDTX
Note 1
Table 1-1. AMR Speech CODEC Bit Rates
, and allows bit rate switching on a frame by frame (20 ms) basis.
Codec Mode
CHAPTER 1 INTRODUCTION
Note 1
User’s Manual U15165EJ3V0UM
12.20 kbps (GSM EFR
10.20 kbps
7.95 kbps
7.40 kbps (IS-641
6.70 kbps (PDC-EFR
5.90 kbps
5.15 kbps
4.75 kbps
1.80 kbps
Bit Rate
Note 3
)
Note 4
Note 2
)
)
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