Three wire pillow speaker with full television remote control functions

A method of operating a television receiver wired to a remote housing including a speaker and a multi function control signal encoder comprising:

• supplying operating power to said multi function control signal encoder from said television receiver over first and second wires;
• supplying audio signals to said speaker from said television receiver over said first wire and a third wire;
• said encoder requiring low current during standby and a relatively higher current during data signal generation;
• regulating the current flow to said encoder;
• producing a data signal comprising pulses of ultrasonic frequency from said encoder;
• filtering said data signal to substantially remove said ultrasonic frequency and produce an envelope of said data signal;
• and
• supplying said envelope from said multi function encoder to said television receiver over said first and second wires.

A pillow speaker remote control for a television receiver connected by first, second and third wires comprising:

• a multi function control signal encoder;
• means for supplying operating power to said encoder from said television receiver over said first and said second wires;
• means for supplying an audio signal to said pillow speaker from said television receiver over said first wire and said third wire;
• and
• means for supplying encoded control signals from said encoder to said television receiver over said first and said second wires.

A pillow speaker remote control for a television receiver connected by first, second and third wires comprising:

• a multi function control signal encoder;
• means for supplying operating power to said encoder from said television receiver over said first and said second wires;
• regulating means for controlling current flow to said encoder;
• means for supplying an audio signal to said pillow speaker from said television receiver over said first wire and said third wire;
• said multi function encoder developing data pulses of ultrasonic frequency;
• filtering means for removing said ultrasonic frequency and generating an envelope of said data pulses;
• and
• means for supplying said envelope of data pulses to said television receiver over said first and said second wires.