System and method for biological signal processing with highly auto-correlated carrier sequences

A computer-implemented method for biological signal recording, comprising:

• transmitting control signals from a transmitter of a sensor to a transmission source, wherein the control signals are transmitted according to a carrier sequence code and the transmission source transmits energy towards a subject according to the carrier sequence code, the carrier sequence code having an auto correlation function;
• receiving at a receiver of the sensor an evoked biological signal in response to energy reflection returned from the subject, wherein the evoked biological signal is an analog signal and modulated according to the carrier sequence code;
• demodulating the evoked biological signal by processing a convolution of the evoked biological signal with the carrier sequence code resulting in an evoked biological signal spectrum, the evoked biological signal spectrum having signal-to-noise ratio proportional to a peak to sideband ratio, wherein the peak to sideband ratio is a function of the carrier sequence code;
• outputting a true evoked biological signal by extracting the true evoked biological signal from the modulated evoked biological signal based on the peak to sideband ratio.

A system for biological signal recording, comprising:

• a memory storing instructions that are executed by a processor that includes:
• a sensor including a transmitter to transmit control signals to a transmission source, wherein the transmission source transmits energy towards a subject according to the control signals, the sensor further including a receiver to receive an evoked biological signal in response to energy reflection returned from the subject, wherein the evoked biological signal is an analog signal;
• a system clock, communicatively coupled to the sensor, to process a sampled evoked biological signal at a predetermined sampling rate;
• a modulator, communicatively coupled to the sensor, to receive the sampled evoked biological signal and modulate the sampled evoked biological signal with a carrier sequence code having an autocorrelation function;
• a demodulator, communicatively coupled to the sensor, to receive the modulated evoked biological signal and demodulate the modulated evoked biological signal by processing a convolution of the modulated evoked biological signal with the carrier sequence code resulting in an evoked biological signal spectrum, the evoked biological signal spectrum having a peak to sideband ratio as a function of the carrier sequence code;
• and
• a filter, communicatively coupled to the sensor, to process deviations between the sampled evoked biological signal and the peak to sideband ratio, filters noise artifacts from the sampled evoked biological signal based on the processed deviations, and outputs a true evoked biological signal based on the filtering.

A system for biological signal recording, comprising:

• a memory storing instructions that are executed by a processor that includes:
• a sensor including a transmitter to transmit control signals according to a carrier sequence code to a transmission source, wherein the transmission source transmits energy towards a subject according to the carrier sequence code, the carrier sequence code having an autocorrelation function,
• wherein the sensor further includes a receiver to receive an evoked biological signal in response to energy reflection returned from the subject, wherein the evoked biological signal is an analog signal and modulated according to the carrier sequence code;
• and
• a demodulator, communicatively coupled to the sensor, to receive the modulated evoked biological signal and demodulate the modulated evoked biological signal by processing a convolution of the evoked biological signal with the carrier sequence code resulting in an evoked biological signal spectrum, the evoked biological signal spectrum having signal-to-noise ratio proportional to a peak to sideband ratio, wherein the peak to sideband ratio is a function of the carrier sequence code,
• wherein the demodulator outputs a true evoked biological signal by extracting the true evoked biological signal from the modulated evoked biological signal based on the peak to sideband ratio.