EP 0954851 A4 19991110 -
Publication
Application
Priority
- US 9702898 W 19970226
- US 1229696 P 19960226
Abstract (en)
[origin: WO9731367A1] A speech compression system called "Transform Predictive Coding" or TPC, provides encoding for 7 kHz band speech at 16 kHz sampling at a target bit-rate of 16 or 32 kb/s one or two bits per sample. The system uses short and long term prediction to remove redundancy. The prediction residual is transformed and coded in the frequency domain as shown on the figure by (110) after accepting time domain data from (60) and parameter input from (100), which corrects the spectrum for auditory perception. The TPC coder uses only open-loop quantization as shown by (70) and therefore has low complexity. The speech quality is transparent at 32 kb/s, is very good at 24 kb/s, and is acceptable at 16 kb/s.
IPC 1-7
IPC 8 full level
G10L 19/002 (2013.01); G10L 19/02 (2013.01); G10L 19/12 (2013.01); H03M 7/30 (2006.01); H04B 14/04 (2006.01)
CPC (source: EP)
G10L 19/002 (2013.01); G10L 19/0212 (2013.01); G10L 19/12 (2013.01)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 9731367A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 9731367 A1 19970828; CA 2219358 A1 19970828; EP 0954851 A1 19991110; EP 0954851 A4 19991110; JP H11504733 A 19990427; MX 9708203 A 19971231
DOCDB simple family (application)
US 9702898 W 19970226; CA 2219358 A 19970226; EP 97907830 A 19970226; JP 53038297 A 19970226; MX 9708203 A 19970226