Lucent Technologies Inc.

Nuri Ruhi Dagedeviren

Donald Lars Duttweiler

Dewayne Alan Spires

Gerard Joseph Pepenella

Lynn Emery Ditty

Quantization noise, introduced into data transmission when analog signals are translated into PCM code using the logarithmic conversion of &mgr;-law or A-law rules necessary to accommodate the transmission of voice signals, limits the maximum attainable speed of data transmission. However, when the PCM code signals represent data (rather than voice signals), linear conversion of analog data signals into the PCM code would avoid such logarithmic quantization noise. To signal the translating codec that a digital modem call is being made, the digital modem allocates one or more of the least significant bit positions of the code representing the 2100 Hz answer-tone-with-phase-reversal (specified in ITU-T Recommendation G. 165) to send a repetitive pattern &ldquo;P &rdquo; to signal to the associated codec that a digital modem connection has been made. When the codec detects the P pattern it will linearly convert analog data signals into PCM code, thereby reducing the introduction of logarithmic quantization noise.

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Red Bank, NJ, United States of America

Nuri Ruhi Dagedeviren