Enhanced fading and random pattern error protection for dynamic

Details Enhanced fading and random pattern error protection for dynamic Enhanced fading and random pattern error protection for dynamic

1995-06-02

1998-01-20

Baker, Stephen M.

Excavating

H04L 100

Patent

active

057107815

ABSTRACT:
A method for correcting random errors, and detecting and replacing fading errors in radio frequency (RF) digital transmissions, such as voice transmission. In a Dynamic Bit Allocation Sub-Band Coder (DBASBC), bits corresponding to sub-band energy levels are protected before transmission. If the bit error rate detected for a current speech frame is sufficiently high for a sufficient period of time, the band energies for the speech frame are zeroed thereby effectively muting the speech coder output for that frame. If muting is not required but there still exists a bit error condition detected as a fade, the speech frame is deemed corrupted. As a result, the energies for the bands in the current speech frame are selectively replaced with the band energies from the previous frame (assuming the previous frame band energies are reasonable values). Otherwise, the individual band energies are examined one by one. If the individual band energy requires correction, the band energies are replaced individually. In addition, the energy replacement values are checked for reasonableness.

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