A method for quantizing, in a super-frame including a sequence of frames of an Extended Adaptive Multi-Rate - Wideband (AMR-WB+) codec or a unified speech and audio coder (USAC) codec, LPC filters calculated during the frames of the sequence, wherein the LPC filter quantizing method comprises: first quantizing one of the LPC filters using absolute quantization; characterized in that said method further comprises quantizing (503, 504, 505) the other LPC filters using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to at least one previously quantized filter amongst the LPC filters, wherein: the sequence of frames consists of four frames with a first frame during which a filter LPC1 is calculated, a second frame during which a filter LPC2 is calculated, a third frame during which a filter LPC3 is calculated, and a fourth frame during which a filter LPC4 is calculated; quantizing the first quantized LPC filter comprises quantizing the filter LPC4 using absolute quantization; and quantizing the other LPC filters comprises: - quantizing the filter LPC2 using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to the quantized filter LPC4; - quantizing the filter LPC1 using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to the quantized filter LPC2; - quantizing the filter LPC3 using a quantization mode selected from the group consisting of absolute quantization, differential quantization relative to the quantized filter LPC2, differential quantization relative to the quantized filter LPC4, and differential quantization relative to both the quantized filters LPC2 and LPC4. first quantizing one of the LPC filters using absolute quantization; characterized in that said method further comprises quantizing (503, 504, 505) the other LPC filters using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to at least one previously quantized filter amongst the LPC filters, wherein: the sequence of frames consists of four frames with a first frame during which a filter LPC1 is calculated, a second frame during which a filter LPC2 is calculated, a third frame during which a filter LPC3 is calculated, and a fourth frame during which a filter LPC4 is calculated; quantizing the first quantized LPC filter comprises quantizing the filter LPC4 using absolute quantization; and quantizing the other LPC filters comprises: - quantizing the filter LPC2 using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to the quantized filter LPC4; - quantizing the filter LPC1 using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to the quantized filter LPC2; - quantizing the filter LPC3 using a quantization mode selected from the group consisting of absolute quantization, differential quantization relative to the quantized filter LPC2, differential quantization relative to the quantized filter LPC4, and differential quantization relative to both the quantized filters LPC2 and LPC4. the sequence of frames consists of four frames with a first frame during which a filter LPC1 is calculated, a second frame during which a filter LPC2 is calculated, a third frame during which a filter LPC3 is calculated, and a fourth frame during which a filter LPC4 is calculated; quantizing the first quantized LPC filter comprises quantizing the filter LPC4 using absolute quantization; and quantizing the other LPC filters comprises: - quantizing the filter LPC2 using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to the quantized filter LPC4; - quantizing the filter LPC1 using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to the quantized filter LPC2; - quantizing the filter LPC3 using a quantization mode selected from the group consisting of absolute quantization, differential quantization relative to the quantized filter LPC2, differential quantization relative to the quantized filter LPC4, and differential quantization relative to both the quantized filters LPC2 and LPC4. - quantizing the filter LPC2 using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to the quantized filter LPC4; - quantizing the filter LPC1 using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to the quantized filter LPC2; - quantizing the filter LPC3 using a quantization mode selected from the group consisting of absolute quantization, differential quantization relative to the quantized filter LPC2, differential quantization relative to the quantized filter LPC4, and differential quantization relative to both the quantized filters LPC2 and LPC4.