Bar code reading and data collection unit with ultrasonic wireless data transmission

A bar code scanner, comprising:

• an ultrasonic sensor configured to transmit ultrasonic frequencies and to receive ultrasonic frequencies;
• an amplifier connected to the ultrasonic sensor and configured to amplify the received ultrasonic frequencies as an amplified signal;
• a demodulator connected to the amplifier and configured to demodulate the amplified signal as a demodulated signal;
• a low pass filter connected to the demodulator and configured to filter out any frequency components of the demodulated signal above a predetermined frequency and to output a filtered signal as a result thereof;
• a comparator connected to the low pass filter and configured to determine if the filtered signal exceeds a predetermined voltage threshold;
• an ultrasonic driver connected to the ultrasonic sensor and configured to receive digital data and to convert the digital data into an ultrasonic signal that is provided to the ultrasonic sensor to be transmitted over-the-air;
• and
• a processor connected to the comparator and to the ultrasonic driver, the processor configured to output the digital data to be transmitted over-the-air to the ultrasonic driver, the processor configured to receive the comparison result from the comparator in order to determine a time period in which no ultrasonic signals are detected in order to transmit the digital data as the ultrasonic signal over-the-air.