DEVICES, SYSTEMS AND METHODS OF LOCATION IDENTIFICATION

• US 20150201393A1
• Filed: 07/23/2014
• Published: 07/16/2015
• Est. Priority Date: 01/14/2014
• Status: Abandoned Application

• Current Assignee: Acer, Inc.
• Original Assignee: Acer, Inc.
• Inventors: Tu, Po-Jen, Chang, Jia-Ren, Fang, Ming-Chun, Hsu, Wen-Cheng, Yang, Chao-Kuang, Ho, Chun-Chi, Lee, Chia-Hsun
• Application Number:
  US14/338,716
• Publication Number:
  US 20150201393A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01S 3/808 using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
• CPC Class Codes: G01S 5/00 Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using active systems G01S13/00, G01S15/00, G01S17/00
• CPC Class Codes: H04W 4/029 Location-based management or tracking services

Abstract

A location identification device, adopted in an audio output device outputting an audio signal, includes a first audio receiving device, a second audio receiving device, and a processor. The first audio receiving device samples the audio signal by a sampling frequency to generate first sample points. A waveform of the audio signal is a superposition result of a high frequency signal and an envelope. The second audio receiving device, which is away from the first audio receiving device at a predetermined distance, samples the audio signal by the sampling frequency to generate second sample points. The processor obtains the first envelope of a first characteristic value and the second envelope of a second characteristic value for identifying a location of the audio output device according to a time difference and an amplitude difference between the first characteristic value and the second characteristic value.

Claims

1. A location identification device, adopted in an audio output device outputting an audio signal, comprising:

a first audio receiving device sampling the audio signal by a sampling frequency to generate a plurality of first sample points, wherein a waveform of the audio signal is a superposition result of a high frequency signal and an envelope of a characteristic value;

a second audio receiving device, away from the first audio receiving device at a predetermined distance, sampling the audio signal by the sampling frequency to generate a plurality of second sample points; and

a processor obtaining the first envelope of a first characteristic value according to the first sampling points and obtaining the second envelope of a second characteristic value according to the second sampling points, wherein the processor identifies a location of the audio output device according to a time difference and an amplitude difference between the first characteristic value and the second characteristic value.

2. The location identification device of claim 1, wherein a ratio of a product of the sampling frequency by the predetermined distance to a sound speed is greater than 1.

3. The location identification device of claim 2, wherein the sampling frequency is less than 10 times the frequency of the audio signal.

4. A location identification system comprising:

an audio output device outputting an audio signal, wherein a waveform of the audio signal is a superposition result of a high-frequency signal and an envelope of a characteristic value;

a location identification device comprising;

a first audio receiving device sampling the audio signal by a sampling frequency to generate a plurality of first sample points; and

a second audio receiving device, away from the first audio receiving device at a predetermined distance, sampling the audio signal by the sampling frequency to generate a plurality of second sample points; and

a processor obtaining the first envelope of a first characteristic value according to the first sampling points and obtaining the second envelope of a second characteristic value according to the second sampling points, wherein the processor identifies a location of the audio output device according to a time difference and an amplitude difference between the first characteristic value and the second characteristic value.

5. The location identification system of claim 4, wherein a ratio of a product of the sampling frequency by the predetermined distance to a sound speed is greater than 1.

6. The location identification system of claim 4, wherein the sampling frequency is less than 10 times the frequency of the audio signal.

7. A location identification method, adopted in an audio output device outputting an audio signal, comprising:

sampling the audio signal to generate a plurality of first sample points by a first audio receiving device with a sampling frequency, wherein a waveform of the audio signal is a superposition result of a high frequency signal and an envelope of a characteristic value;

sampling the audio signal to generate a plurality of second sample points by a second audio receiving device with the sampling frequency, wherein the second audio receiving device is away from the first audio receiving device at a predetermined distance;

obtaining a first envelope according to the first sampling points, wherein the first envelope comprises a first characteristic value;

obtaining a second envelope according to the second sampling points, wherein the second envelope comprises a second characteristic value; and

identifying a location from which the audio signal is generated according to a time difference and an amplitude difference between the first characteristic value and the second characteristic value.

8. The location identification method of claim 7, wherein a ratio of a product of the sampling frequency by the predetermined distance to a sound speed is greater than 1.

9. The location identification method of claim 7, wherein the first characteristic value and the second characteristic value are generated by averaging the results of several calculations.