Reduced complexity audio mixing apparatus

An audio signal mixing apparatus comprising:

• a first plurality of input nodes, each of said input nodes being associated with an input audio signal;
• a first plurality of switches;
• a first plurality of gain amplifiers, each of said first plurality of gain amplifiers having an input and an output, each of said outputs being coupled together;
• and
• a first plurality of summing nodes, each of said first plurality of summing nodes being coupled to a respective one of said inputs of said first plurality of gain amplifiers;
• wherein for each of said first plurality of summing nodes, each of said first plurality of input nodes is coupled to said each of said summing nodes through an associated one of said first plurality of switches.

A method of mixing audio signals from a plurality of sources, said method comprising the steps of:

• summing together at least two of said audio signals that require a predetermined gain applied;
• applying the gain using a circuit comprising at least one of a plurality of fixed gain amplifiers to produce a weighted signal;
• and
• summing the weighted signal with other signals produced by similar circuits having different gains.