Low frequency ultrasonic communication system, low frequency ultrasonic communication method, low frequency ultrasonic transmitting apparatus, and low frequency ultrasonic receiving apparatus
AssigneeGwangju Institute of Science and Technology
InventorsHong Kook KIM, Kwang Myung JEON
Life of this patent
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Abstract
A low frequency ultrasonic communication system includes: a low frequency ultrasonic transmitting apparatus configured to transmit data using a low frequency ultrasonic wave; and a low frequency ultrasonic receiving apparatus configured to recover the data by processing a low frequency ultrasonic reception signal transmitted from the low frequency ultrasonic transmitting apparatus. In communication between the transmitting apparatus and the receiving apparatus, modulation is performed using a DPSK scheme, and FEC coding is used to perform channel coding before the modulation.
Claims14
A low frequency ultrasonic communication system comprising:
- a low frequency ultrasonic transmitting apparatus configured to transmit data using a low frequency ultrasonic wave;
- and
- a low frequency ultrasonic receiving apparatus configured to recover the data by processing a low frequency ultrasonic reception signal transmitted from the low frequency ultrasonic transmitting apparatus,
- where in the low frequency ultrasonic transmitting apparatus includes:
- a DPSK modulator configured to provide a symbol by performing DPSK modulation on digital data;
- a transmission side filter/AGC configured to convert the symbol into a frame by filtering the symbol and controlling a gain;
- a digital to analog converter configured to convert the frame into an analog signal;
- and
- a speaker configured to transmit the analog signal using the low frequency ultrasonic wave,
- wherein the low frequency ultrasonic receiving apparatus include:
- a microphone configured to receive the low frequency ultrasonic wave;
- an analog to digital converter configured to convert a signal received as an analog signal into a digital reception signal;
- a reception side filter/AGC configured to filter the received signal and control a gain to obtain an estimation symbol estimated from the received signal;
- and
- a DPSK demodulator configured to acquire the digital data by performing DPSK demodulation on the estimation symbol.
-6. (canceled)
A low frequency ultrasonic communication method comprising:
- channel-coding digital data;
- DPSK-modulating a coding block coded through the channel-coding to provide a symbol;
- filtering the symbol;
- acquiring a frame by controlling a gain of the filtered symbol;
- generating an analog signal by performing digital to analog conversion on the frame;
- and
- transmitting the analog signal in the air using a low frequency ultrasonic wave.
(canceled)
Dependencies are inferred from the claim text.