Wideband speech and audio compression for wireless communications

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN043096 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

A Space-Time Coded OFDM Based MPEG-4 Audio Transceiver

An MPEG-4 based Space-Time (ST) coded Orthogonal Frequency Division Multiplexing (OFDM) audio transceiver is proposed. The high-quality MPEG-4 audio codec is operated at bit rates between 16 and 64 kbit/s per channel and combined with turbo channel codes as well as space time codes. As expected, the space-time coding scheme, using two transmitters and one receiver outperformed the conventional one transmitter, one receiver arrangement by about 4dB in channel SNR terms, when maintaining an error-free audio quality

A Redundant Residue Number System Coded Burst-by-Burst Adaptive Joint-Detection Based CDMA Speech Transceiver

A burst-by-burst (BbB) adaptive speech transceiver is proposed, which can drop its source coding rate and speech quality under transceiver control in order to invoke a more error resilient modem mode among less favorable channel conditions. The adaptive multirate (AMR) speech codec is operated at bit rates of 4.75 and 10.2 kb/s and combined with source sensitivity-matched redundant residue number system (RRNS) based channel codes. BbB adaptive joint detection aided code division multiple access is used for supporting the dual rate speech codec. Both the objective and subjective speech quality assessments favored the proposed BbB adaptive transceiver. Index Terms—AMR voice codec,HSDP A,RNS,RRNS

A common BIM deletion polymorphism mediates intrinsic resistance and inferior responses to tyrosine kinase inhibitors in cancer

10.1038/nm.2713Nature Medicine184521-528NAME