Method and apparatus for transmitting and receiving amplitude modulated stereo

The method of receiving a transmitted amplitude modulated radio frequency carrier signal produced by modulating the positive and negative half cycles of a transmitting antenna radio frequency current each with different audio frequency intelligence signals, the method comprising:

• a. providing a first amplitude modulated receiving antenna circuit including a corresponding first receiving antenna with means in said first receiving antenna for allowing radio frequency current to flow in one direction only, whereby to be responsive only to one of the audio frequency intelligence signals,
• b. providing a second amplitude modulated receiving antenna circuit including a corresponding second receiving antenna with means in said second receiving antenna for allowing the radio frequency current to flow in the opposite direction only, whereby to be responsive only to the other of said audio frequency intelligence signals,
• c. amplifying the two audio frequency intelligence signals separately, and
• d. applying the two amplified audio frequency intelligence signals to separate audio speakers.

The method of transmitting and receiving amplitude modulated stereo, comprising:

• a. generating a radio frequency carrier signal,
• b. amplifying said carrier signal,
• c. coupling said amplified carrier signal to a transmitting antenna to produce radio frequency current flow between said antenna and its ground,
• d. utilizing the positive half cycles only of said radio frequency antenna current to activate a first modulator connected to a source of first audio frequency intelligence signals, thereby amplitude modulating the positive half cycles of said antenna current with a first audio frequency intelligence signal,
• e. utilizing the negative half cycles only of said radio frequency antenna current to activate a second modulator connected to a source of second audio frequency intelligence signals, thereby amplitude modulating the negative half cycles of said antenna current with a second audio frequency intelligence signal,
• f. thereby transmitting the modulated carrier signal,
• g. providing a first amplitude modulated receiving antenna circuit including a corresponding first receiving antenna with means in said first receiving antenna for allowing radio frequency current to flow in one direction only, whereby to be responsive only to one of the audio frequency intelligence signals,
• h. providing a second amplitude modulated receiving antenna circuit including a corresponding second receiving antenna with means in said second receiving antenna for allowing radio frequency current to flow in the opposite direction only, whereby to be responsive only to the other of said audio frequency intelligence signals,
• i. amplifying the two audio frequency intelligence signals separately and
• j. applying the two amplified audio frequency intelligence signals to separate audio speakers.

Apparatus for transmitting amplitude modulated stereo, comprising:

• a. radio frequency carrier signal generating means,
• b. radio frequency signal amplifying means coupling the generating means to a transmitting antenna for producing radio frequency current flow between said antenna and its ground,
• c. first and second microphone means for converting acoustical energy into audio frequency intelligence signals,
• d. first audio frequency signal modulating means connected to the first microphone means and interconnecting the transmitting antenna and its ground for operation only by the positive half cycles of the radio frequency antenna current, for modulation thereof by the first audio frequency signal, and
• e. second audio frequency signal modulating means connected to the second microphone means and interconnecting the transmitting antenna and its ground for operation only by the negative half cycles of the radio frequency antenna current for modulation thereof by the second audio frequency signal.