Processing device and processing method

• US 10,095,350 B2
• Filed: 01/04/2017
• Issued: 10/09/2018
• Est. Priority Date: 11/08/2013
• Status: Active Grant

• Current Assignee: eGalax_eMPIA Technology Inc.
• Original Assignee: eGalax_eMPIA Technology Inc.
• Inventors: Chang, Chin-Fu
• Primary Examiner(s): Elahi, Towfiq
• Application Number:
  US15/398,263
• Publication Number:
  US 20170115816A1
• Time in Patent Office: 643 Days
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/04162 for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware
• CPC Class Codes: G06F 3/0442 using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

The present invention provides a processing device, which includes a plurality of digital demodulators and an information transmitting module. Each of the digital demodulators is configured to generate in-phase and quadrature signal information corresponding to a frequency. The information transmitting module is configured to receive, process, and transmit the in-phase and quadrature signal information.

Claims

1. A digital demodulator, comprising:

an analog-to-digital converter (ADC) for sampling and converting an input signal to a digital received signal;

a signal generator for generating a corresponding in-phase signal and a corresponding quadrature signal based on the sampling points of the ADC and a frequency, wherein the signal generator generates a set of in-phase and quadrature signals every 60 degrees, and the ADC also performs sampling every 60 degrees, wherein at 30, 90, 150, 210, 270 and 330 degrees, the signal values corresponding to a sinusoidal wave generated by the signal generator are 1, 2, 1, −

1, −

2 and −

1, respectively; and

the signal values corresponding to a cosine wave generated by the signal generator are 1, 0, 1, −

1, 0 and −

1, respectively;

at least one mixer for mixing the in-phase signal and the digital received signal to generate an in-phase digital signal and mixing the quadrature signal and the digital received signal to generate a quadrature digital signal; and

at least one addition integrator for performing addition integration on the in-phase digital signal to generate an in-phase integration signal and performing addition integration on the quadrature digital signal to generate a quadrature integration signal,

wherein the mixer and the addition integrator both perform operations on integers.

2. The digital demodulator of claim 1, further comprising:

at least one squarer for calculating a square of the in-phase integration signal and a square of the quadrature integration signal; and

an adder for calculating a sum of the squares of the in-phase integration signal and the quadrature signal.

3. The digital demodulator of claim 2, further comprising:

a Root-Mean-Square (RMS) element for performing RMS operation on the sum to obtain a signal strength of the input signal.

4. A digital demodulator, comprising:

an analog-to-digital converter (ADC) for sampling and converting an input signal to a digital received signal;

a signal generator for generating a corresponding in-phase signal and a corresponding quadrature signal based on the sampling points of the ADC and a frequency, wherein the signal generator generates a set of in-phase and quadrature signals every 90 degrees, and the ADC also performs sampling every 90 degrees, wherein at 45, 135, 225 and 315 degrees, the signal values corresponding to a sinusoidal wave generated by the signal generator are 1, 1, −

1 and −

1, respectively; and

the signal values corresponding to a cosine wave generated by the signal generator are 1, −

1, −

1 and 1, respectively;

at least one mixer for mixing the in-phase signal and the digital received signal to generate an in-phase digital signal and mixing the quadrature signal and the digital received signal to generate a quadrature digital signal; and

at least one addition integrator for performing addition integration on the in-phase digital signal to generate an in-phase integration signal and performing addition integration on the quadrature digital signal to generate a quadrature integration signal,

wherein the mixer and the addition integrator both perform operations on integers.

5. The digital demodulator of claim 4, further comprising:

at least one squarer for calculating a square of the in-phase integration signal and a square of the quadrature integration signal; and

an adder for calculating a sum of the squares of the in-phase integration signal and the quadrature signal.

6. The digital demodulator of claim 5, further comprising:

a Root-Mean-Square (RMS) element for performing RMS operation on the sum to obtain a signal strength of the input signal.

7. A digital demodulating method, comprising:

performing analog-to-digital (ADC) on an input signal to generate a digital received signal;

mixing an in-phase signal and the digital received signal to generate an in-phase digital signal;

mixing a quadrature signal and the digital received signal to generate a quadrature digital signal, wherein a set of the in-phase signal and the quadrature signals is generated every 60 degrees, and the ADC step also performs sampling every 60 degrees, wherein at 30, 90, 150, 210, 270 and 330 degrees, the signal values corresponding to a sinusoidal wave generated by the signal generator are 1, 2, 1, −

1, −

2 and −

1, respectively; and

the signal values corresponding to a cosine wave generated by the signal generator are 1, 0, 1, −

1, 0 and −

1, respectively;

performing addition integration on the in-phase digital signal to generate an in-phase integration signal; and

performing addition integration on the quadrature digital signal to generate a quadrature signal,

wherein the mixing step and the addition integration step both perform operations on integers.

8. The digital demodulating method of claim 7, further comprising:

calculating a square of the in-phase integration signal and a square of the quadrature integration signal; and

calculating a sum of the squares of the in-phase integration signal and the quadrature signal.

9. The digital demodulating method of claim 8, further comprising:

performing Root-Mean-Square operation on the sum to obtain a signal strength of the input signal.

10. A digital demodulating method, comprising:

performing analog-to-digital (ADC) on an input signal to generate a digital received signal;

mixing an in-phase signal and the digital received signal to generate an in-phase digital signal;

mixing a quadrature signal and the digital received signal to generate a quadrature digital signal, wherein a set of the in-phase signal and the quadrature signals is generated every 90 degrees, and the ADC step also performs sampling every 90 degrees, wherein at 45, 135, 225 and 315 degrees, the signal values corresponding to a sinusoidal wave generated by the signal generator are 1, 1, −

1 and −

1, respectively; and

the signal values corresponding to a cosine wave generated by the signal generator are 1, −

1, −

1 and 1, respectively;

performing addition integration on the in-phase digital signal to generate an in-phase integration signal; and

performing addition integration on the quadrature digital signal to generate a quadrature signal,

wherein the mixing step and the addition integration step both perform operations on integers.

11. The digital demodulating method of claim 10, further comprising:

calculating a square of the in-phase integration signal and a square of the quadrature integration signal; and

calculating a sum of the squares of the in-phase integration signal and the quadrature signal.

12. The digital demodulating method of claim 11, further comprising:

performing Root-Mean-Square operation on the sum to obtain a signal strength of the input signal.