Methods and apparatus to generate a modulation protocol to output audio

An apparatus comprising:

• a modulation circuit having a first input, a second input, a first modulated signal output, and a second modulated signal output;
• a first multiplexer having inputs coupled to the first and second modulated signal outputs;
• a second multiplexer having inputs coupled to the first and second modulated signal outputs;
• a first power stage having a first power stage input and a first power stage output, the first power stage input coupled to an output of the first multiplexer;
• and
• a second power stage having a second power stage input and a second power stage output, the second power stage input coupled to an output of the second multiplexer.

An apparatus comprising:

• a modulation circuit having a first input, a second input, a first modulated signal output, and a second modulated signal output;
• a first power stage having a first power stage input and a first power stage output, the first power stage input coupled to the first modulated signal output;
• a second power stage having a second power stage input and a second power stage output, the second power stage input coupled to the second modulated signal output;
• a switch coupled between one of:
• the first power stage input and the first modulated signal output, or the second power stage input and the second modulated signal output;
• and
• a mode detector having a first detector output and a second detector output, the first detector output coupled to a switch control terminal of the switch, and the second detector output coupled to one of the first or second power stage outputs.

A method comprising:

• receiving a first signal;
• receiving a second signal;
• receiving a third signal from a first output of a first power stage, the first power stage having a first power stage input;
• receiving a fourth signal from a second output of a second power stage, the second power stage having a second power stage input;
• generating a first control signal and an inverted version of the first control signal responsive to the first signal and the second signal;
• generating a second control signal and an inverted version of the second control signal responsive to the first signal and the second signal;
• responsive to at least one of the third signal or the fourth signal:
• selecting one of the first control signal or the inverted version of the second control signal;
• and
• selecting one of the second control signal or the inverted version of the first control signal;
• providing the selected one of the first control signal or the inverted version of the second control signal at the first power stage input;
• and
• providing the selected one of the second control signal or the inverted version of the first control signal at the second power stage input.