Methods and systems for generating-phase derivative sound

An apparatus for digitally generating sound from phase and amplitude information of a narrow bandwidth signal, comprising:

• an analog information path;
• a frequency information path, including;
• a phase differentiator module,
• a frequency gain module coupled to an output of said phase differentiator module,
• an audio wave carrier generator,
• a summing junction coupled to outputs of said frequency gain module and said audio wave carrier generator,
• a digitally controlled oscillator coupled to an output of said summing junction;
• and
• an output section coupled to outputs of said analog information path and said frequency information path, said output section including an amplitude modulator coupled to said outputs of said analog information path and said frequency information path, said output section including an analog audio output terminal.

An apparatus for digitally generating sound from phase and amplitude information of a narrow bandwidth signal, comprising:

• means for receiving said amplitude information and said phase information of said narrow bandwidth signal;
• means for determining phase-derivative information from said phase information;
• means for applying frequency gain to said phase-derivative information and for outputting broader-bandwidth phase-derivative information;
• means for summing said broader-bandwidth phase-derivative information with an audio wave carrier having an audio band frequency, said means for summing including means for outputting control information that includes said broader-bandwidth phase-derivative information imparted to said audio wave carrier;
• means for digitally controlling an oscillator with said control information, wherein said oscillator outputs frequency modulation information that varies with respect to said broader-bandwidth phase-derivative information;
• and
• means for converting, at an output sample rate that is higher than said audio band frequency, said amplitude information and said frequency modulation information to an analog amplitude/frequency modulated speaker control signal.

A computer program product comprising a computer useable medium having computer program logic stored therein, said computer program logic enabling a computer system to digitally convert phase and amplitude information of a narrow bandwidth signal to wider-bandwidth audio frequency information, wherein said computer program logic comprises:

• a first function that enables the computer to receive said amplitude information and said phase information of said narrow bandwidth signal;
• a second function that enables the computer to determine phase-derivative information from said phase information;
• a third function that enables the computer to apply frequency gain to said phase-derivative information and to output broader-bandwidth phase-derivative information;
• a fourth function that enables the computer to sum said broader-bandwidth phase-derivative information with an audio wave carrier having an audio band frequency, and that enables the computer to output control information that includes said broader-bandwidth phase-derivative information imparted to said audio wave carrier;
• a fifth function that enables the computer to control an oscillator with said control information, wherein said oscillator outputs frequency modulation information that varies with respect to said broader-bandwidth phase-derivative information;
• and
• a sixth function that enables the computer to convert, at an output sample rate that is higher than said audio band frequency, said amplitude information and said frequency modulation information to an analog amplitude/frequency modulated speaker control signal.