Patent ID: 7142559

Claim:
A packet converting apparatus for converting a first type packet data to a second type packet data, the packet converting apparatus comprising: a bit unpacking unit for bit unpacking the first type packet data; a parameter inverse quantization unit for inverse quantizing unpacked data to obtain a first parameter of the first type packet data, wherein the first parameter includes at least one of line spectrum pair, pitch, adaptive codebook (ACB) gain, ACB index, fixed codebook (FCB) gain and FCB index; a parameter converter for converting the first parameter to a second parameter of the second type packet data using inter-frame interpolation without synthesizing a pulse code modulation (PCM) signal, wherein the inter-frame interpolation in the parameter converter constrains a search range in response to the ACB gain and the ACB index and searches the search range to obtain values corresponding to the ACB gain and the ACB index of the first parameter and converts the values into an ACB gain and an ACB index of the second parameter; a quantization unit for quantizing the second parameter converted by the parameter converter and outputting a second type quantized data; and a bit packing unit for bit packing the second type quantized data to the second type packet data.