Audio Codecs Mpeg 4 Aac Ieee Coding Schemes

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PARAmode 2 permits automatic switching between HVXC and HILN depending on the current input signal type. In PARAmode 3 the HVXC and HILN coders can be used simultaneously and their output signals are added (mixed) in the decoder. The integrated parametric coder uses a frame length of 40 ms and a sampling rate of 8 kHz and can operate at 2025 bit/s or any higher bitrate. Operation at 4 kbit/s or higher is suggested. 1 Integrated parametric decoder For the „HVXC only“ and „HILN only“ modes the parametric decoder is not modified.

1 Integrated parametric decoder For the „HVXC only“ and „HILN only“ modes the parametric decoder is not modified. 52 In „switched HVXC / HILN“ and „mixed HVXC / HILN“ modes both HVXC and HILN decoder tools are operated alternatively or simultaneously according to the PARAswitchMode or PARAmixMode of the current frame. e. 5 ms). e. 10 ms). To avoid hard transitions at frame boundaries when the HVXC or HILN decoders are switched on or off, the respective decoder output signals are faded in and out smoothly.

The resampling can be realized by applying two lowpass-FIR-filter operations to the signal x and linearly interpolating between these two values. if ( resampleFactor>1 ) fc = 1 else fc = resampleFactor The following function calculates the time response of an appropriate lowpass filter with an order of 8 and an oversampling factor of 4. The cutoff frequency is fc. 125*x))*sin(fc*x)/x); } } To perform the FIR filter operation the following C function can be used. The parameters are the signal, the time response (as returned by the function above) and the position of the sampling point.

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