ULTRASONIC SYSTEM AND COMMUNICATION METHOD THEREOF

• US 20110134725A1
• Filed: 07/21/2010
• Published: 06/09/2011
• Est. Priority Date: 12/03/2009
• Status: Active Grant

• Current Assignee: Lite-On Technology Corporation
• Original Assignee: Lite-On It Corporation (Lite-On Technology Corporation)
• Inventors: Su, Chung-Yi, Lee, Yi-Chung
• Granted Patent: US 8,422,337 B2
• Time in Patent Office: Days
• US Class Current: 367/135
• CPC Class Codes: H04B 11/00 Transmission systems employing sonic, ultrasonic or infrasonic waves

Abstract

An ultrasonic system including an ultrasonic transmitter and an ultrasonic receiver is provided. The ultrasonic transmitter emits a transmission signal, which includes a synchronous burst and multiple data bursts. The ultrasonic receiver receives a synchronous echo, and determines whether the amplitude of the synchronous echo is larger than a first threshold. If the amplitude of the synchronous echo is larger than the first threshold, then the ultrasonic receiver interprets the multiple data echoes corresponding to the data bursts to obtain a digital signal.

Claims

1. An ultrasonic system, comprising:

an ultrasonic transmitter used for emitting a transmission signal, which comprises a synchronous burst and a plurality of data bursts; and

an ultrasonic receiver used for receiving a synchronous echo and determining whether the amplitude of the synchronous echo is larger than a first threshold, wherein if the amplitude of the synchronous echo is larger than the first threshold, then the ultrasonic receiver interprets a plurality of data echoes corresponding to the data bursts to obtain a digital signal.

2. The ultrasonic system according to claim 1, wherein the synchronous echo corresponds to a time-of-flight window, and the data echoes each corresponds to a plurality of data windows of an information window.

3. The ultrasonic system according to claim 1, wherein the transmission signal is a PWM (burst width modulation) signal, the synchronous burst and the data burst are formed by a plurality of bursts, and the width of the synchronous burst is larger than that of the data bursts.

4. The ultrasonic system according to claim 1, wherein the ultrasonic receiver determines whether the amplitude of the data echoes is larger than a second threshold:

the ultrasonic receiver regards the data echo as denoting data “

1”

if the amplitude of the data echo is larger than or equal to the second threshold, and the ultrasonic receiver regards the data echo as denoting data “

0”

if the amplitude of the data echo is smaller than the second threshold.

5. The ultrasonic system according to claim 1, wherein the digital signal corresponds to an identification code.

6. The ultrasonic system according to claim 1, wherein the digital signal corresponds to a command.

7. A communication method of ultrasonic system, comprising steps of:

emitting a transmission signal, wherein the transmission signal comprises a synchronous burst and a plurality of data bursts;

receiving a synchronous echo and determining whether the amplitude of the synchronous echo is larger than a first threshold; and

interpreting a plurality of data echoes corresponding to the data bursts to obtain a digital signal if the amplitude of the synchronous echo is larger than the first threshold.

8. The communication method of ultrasonic system according to claim 7, wherein the synchronous echo corresponds to a time-of-flight window, and the data echoes each corresponds to a plurality of data windows of an information window.

9. The communication method of ultrasonic system according to claim 7, wherein the transmission signal is a PWM signal, the synchronous burst and the data burst are formed by a plurality of bursts, and the width of the synchronous burst is larger than that of the data bursts.

10. The communication method of ultrasonic system according to claim 7, further comprising:

determining whether the amplitude of the data echoes is larger than a second threshold;

regarding the data echo as denoting data “

1”

if the amplitude of the data echo is larger than or equal to the second threshold; and

regarding the data echo as denoting data “

0”

if the amplitude of the data echo is smaller than the second threshold.

11. The communication method of ultrasonic system according to claim 7, wherein the digital signal corresponds to an identification code.

12. The communication method of ultrasonic system according to claim 7, wherein the digital signal corresponds to a command.