Application: The mobile Vocoder recognizes four different degrees of voice content on a frame-by-frame basis and outputs sets of digitized voice parameters of four different sizes accordingly. The purpose of the variable rate Vocoder is to allow the transmitter to limit its average transmitted power in proportion to the user's voice activity factor. By lowering the average transmitted power, and therefore its self-interference power, the CDMA system is able to increase its capacity. However, it is convenient to implement only one interleaver and achieve a common rate into the 64-ary Walsh modulator in the mobile. To achieve this convenience, and still retain the capacity advantage derived from the voice activity factor, the IS-95 transmitter in the traffic mode uses inputs from the Vocoder to determine the degree of repetition used to bring the symbol rate up to the common 28.8 ksym/sec rate. If the rate of the coded bits or symbols out of the convolutional encoder is increased by a factor of N by repetition, then the data burst randomizer only allows 1/N of its input Walsh words to pass through to the long-code spreader. The Walsh words passed by the data burst randomizer represent one complete copy of the message symbols with no duplication.