//friend class SID;
// ----------------------------------------------------------------------------
// Inline functions.
// The following function is defined inline because it is called every
// time a sample is calculated.
// ----------------------------------------------------------------------------
//#if RESID_INLINING || defined(RESID_VOICE_CC)
// ----------------------------------------------------------------------------
// Amplitude modulated waveform output (20 bits).
// Ideal range [-2048*255, 2047*255].
// ----------------------------------------------------------------------------
// The output for a voice is produced by a multiplying DAC, where the
// waveform output modulates the envelope output.
//
// As noted by Bob Yannes: "The 8-bit output of the Envelope Generator was then
// sent to the Multiplying D/A converter to modulate the amplitude of the
// selected Oscillator Waveform (to be technically accurate, actually the
// waveform was modulating the output of the Envelope Generator, but the result
// is the same)".
//
// 7 6 5 4 3 2 1 0 VGND
// | | | | | | | | | Missing
// 2R 2R 2R 2R 2R 2R 2R 2R 2R termination
// | | | | | | | | |
// --R---R---R---R---R---R---R-- ---
// | _____
// __|__ __|__ |
// ----- ===== |
// | | | | |
// 12V --- ----- ------- GND
// |
// vout
//
// Bit on: wout (see figure in wave.h)
// Bit off: 5V (VGND)
//
// As is the case with all MOS 6581 DACs, the termination to (virtual) ground
// at bit 0 is missing. The MOS 8580 has correct termination.
//
public Int32 output()
{
// Multiply oscillator output with envelope output.
return((wave.output() - wave_zero) * envelope.output());
}
