закон компандирования с А-характеристикой, функция вида А (в импульсно-кодовой модуляции)
The ITU-T standard for nonuniform quantising logarithmic compression. Converting from u-LAW to A-LAW introduces quantising errors. u-law is used in North America and Japan, and A-law is used in Europe and the rest of the world and international routes.