Oscilloscope with touch control and touch control operating method of displaying waveform thereof

• US 8,928,615 B2
• Filed: 11/08/2012
• Issued: 01/06/2015
• Est. Priority Date: 11/08/2012
• Status: Active Grant

• Current Assignee: Good Will Instrument Co., Ltd.
• Original Assignee: Good Will Instrument Co., Ltd.
• Inventors: Meng, Chiang-Kai, Huang, Yuan-Long
• Primary Examiner(s): NGUYEN, JENNIFER T
• Application Number:
  US13/671,702
• Publication Number:
  US 20140125600A1
• Time in Patent Office: 789 Days
• Field of Search: 345173-178, 178 1801- 1809
• US Class Current: 345/173
• CPC Class Codes: G01R 13/02 for displaying measured electric variables in digital form
• CPC Class Codes: G01R 13/0218 Circuits therefor
• CPC Class Codes: G06F 3/017 Gesture based interaction, e.g. based on a set of recognized hand gestures interaction based on gestures traced on a digitiser G06F3/04883
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

An oscilloscope with touch control has a touch screen display unit and a waveform processing and sampling unit. The touch screen display unit is connected to the waveform processing and sampling unit and has a touch control module and a display module. The touch control module detects a touch gesture and converts the touch gesture into a set of waveform processing parameters. The waveform processing and sampling unit has at least one signal input port to receive at least one external signal to be tested, processes the signal to be tested into a corresponding waveform image, and outputs the waveform image to the display module. Accordingly, the touch screen display unit enables the operation and display of the waveform thereon and provides more space originally occupied by conventional knobs so that the display module can be enlarged or the oscilloscope can be miniaturized.

Claims

1. An oscilloscope with touch control comprising:

a touch screen display unit having;

a touch control module detecting a touch gesture and generating a set of waveform processing parameters according to the touch gesture, wherein the set of waveform processing parameter has a vertical position value, a trigger position value, a gain value and a sampling rate, and the touch control module having;

a touch panel serving to detect at least one moving trajectory of touch point associated with the touch gesture, wherein

when the touch panel of the touch control module detects a single-point drag having a single touch point and a set of continuous coordinates, the set of continuous coordinates of the single-point drag has multiple continuous vertical coordinates and multiple continuous horizontal coordinates of the single touch point; and

when the touch panel of the touch control module detects a multi-point drag having two touch points moving oppositely and two sets of continuous coordinates, each set of continuous coordinates has multiple continuous vertical coordinates and multiple continuous horizontal coordinates associated with one of the touch points of the multi-point drag having two touch points moving oppositely; and

a touch controller connected to the touch panel, and outputting at least one set of continuous coordinates corresponding to the at least one moving trajectory of touch point generated by the touch gesture;

a CPU connected to the touch controller, after receiving the at least one set of continuous coordinates from the touch controller, determining the touch gesture according to a variation of the at least one set of continuous coordinates, generating the set of waveform processing parameters based on the determined touch gesture, setting up the vertical position value according to a variation of the continuous vertical coordinates of a corresponding set of continuous coordinates, setting up the trigger position value according to a variation of the continuous horizontal coordinates of the corresponding set of continuous coordinates, having an activation threshold built therein, multiple zoom levels corresponding to different levels of the gain value and multiple frequency levels corresponding to different levels of the sampling rate, decreasing or increasing the gain value to map to a corresponding vertical scale when the two sets of continuous vertical coordinates of the two touch points of the multi-point drag having two touch points moving oppositely approach or depart from each other vertically and a sum of two respective vertical displacements of the touch points is greater than the activation threshold, and decreasing or increasing the sampling rate to map to a corresponding horizontal scale when the two sets of continuous horizontal coordinates of the two touch points of the multi-point drag having two touch points moving oppositely approach or depart from each other horizontally and a sum of two respective horizontal displacements of the two touch points is greater than the activation threshold; and

a display module; and

a waveform processing and sampling unit connected to the touch control module and the display module of the touch screen display unit, having;

at least one signal input port to respectively receive at least one external signal to be tested, selectively processing one of the at least one external signal to be tested to a corresponding waveform image according to the set of waveform processing parameters, and outputting the waveform image to the display module to further display the waveform image on the display module, and

a vertical position adjustment module, an amplitude gain control module, an analog-to-digital (A/D) conversion module and a digital signal processing module, wherein the vertical position adjustment module is connected to the at least one signal input port.

2. The oscilloscope with touch control as claimed in claim 1, wherein the vertical position adjustment module has two digital-to-analog (D/A) converters and two voltage adders, the two D/A converters are respectively connected to the voltage adders and are connected to the CPU of the touch control module, the CPU outputs the vertical position value to each of the two D/A converters, after receiving the vertical position value, and each D/A converter outputs a corresponding DC voltage to one of the voltage adders, each voltage adder is connected to one of the at least one signal input port to add the DC voltage outputted from a corresponding D/A converter to a corresponding signal to be tested.

3. The oscilloscope with touch control as claimed in claim 2, wherein the amplitude gain control module has two amplifiers, the two amplifiers are connected to the respective voltage adders to receive the signals to be tested outputted from the corresponding voltage adders, and each amplifier has a gain control terminal connected to the CPU of the touch control module for the amplifier to amplify the signal to be tested according to the zoom level mapped to by the corresponding gain value.

4. The oscilloscope with touch control as claimed in claim 3, wherein

the A/D conversion module has two A/D converters respectively connected to the two amplifiers of the amplitude gain control module so as to receive the signals to be tested through the signal addition and amplification and to acquire digital data through the sampling and quantization of the signals to be tested;

and

the digital signal processing module has;

a clock generator connected to the two A/D converters of the A/D conversion module, the sampling control circuit and the CPU of the touch control module, and outputting a clock signal with a frequency corresponding to the frequency level set up by the CPU to the two A/D converters and the sampling control circuit;

an acquisition memory;

a sampling control circuit connected to the acquisition memory, the trigger control circuit and the display module, and storing the digital data quantized by and outputted from the two A/D converters according to the clock signal outputted by the clock generator in the acquisition memory; and

a trigger control circuit outputting a trigger signal to the sampling control circuit so that the sampling control circuit stops sampling after receiving the trigger signal and counting a wait time, reads the digital data with a fixed memory length, takes the digital data as waveform data, and outputs the waveform data to the display module for the display module to display a corresponding waveform.

5. The oscilloscope with touch control as claimed in claim 4, wherein the sampling control circuit sets up a pre-trigger count (Tpre) and a post-trigger count (Tpost), the Tpre and Tpost are calculated with a horizontal position h′

set up by the CPU of the touch control module according to the following equations;

Tpre=(H×

N/2−

h′

), h′

=h+Δ

h, Δ

h=(Δ

d×

N×

H)/I

Tpost=(H×

N/2+h′

), h′

=h+Δ

h, Δ

h=(Δ

d×

N×

H)/I

where N is a number of horizontal divisions displayed on the display module along the horizontal (time) axis, H is a horizontal length (time) per division (unit;

s/div), h is a previous coordinate of a trigger point on the horizontal (time) axis (unit;

s), Δ

h is a distance (time) of the trigger point moving along the horizontal (time) axis in current operation (unit;

s), Δ

d is a pixel count of the single touch point moving horizontally in current operation, and I is a total pixel count of the display module in the horizontal direction; and

after counting the Tpre, the sampling control circuit starts to receive the trigger signal outputted from the trigger control circuit, waits for a time specified by the Tpost after receiving the trigger signal, and then stops sampling, reads the digital data with the fixed memory length from the acquisition memory, processes the digital data to a waveform image, and outputs the waveform image to the display module.

6. The oscilloscope with touch control as claimed in claim 5, wherein when receiving the set of continuous coordinates of the single touch points of the single-point drag, the CPU determines if a slanted angle between a moving direction of the single touch point and the horizontal axis falls within a range of 30°

to 60°

, if negative, neglects the continuous vertical coordinates or the continuous horizontal coordinates with smaller changes, if positive, varies the vertical position value according to a variation of the continuous vertical coordinates and varies the trigger position value according to a variation of the continuous horizontal coordinates.

7. The oscilloscope with touch control as claimed in claim 6, wherein when the touch panel detects a multi-point drag with two touch points moving oppositely and the CPU receives the two sets of continuous coordinates of the two touch points, the CPU determines if a slanted angle between a direction of the two touch points approaching or departing from each other and the horizontal axis falls within a range of 30°

to 60°

(or 120°

to 150°

), if negative, neglects the coordinates with smaller changes approaching or departing from each other along one of the horizontal and vertical directions, if positive, varies the gain value according to a variation of the continuous vertical coordinates of the two touch points approaching or departing from each other and varies the sampling rates according to a variation of the continuous horizontal coordinates approaching or departing from each other.

8. The oscilloscope with touch control as claimed in claim 7, wherein when the touch panel detects a multi-point drag with multiple touch points dragged uni-directionally, if the CPU determines that the touch points are dragged together along the vertical axis, the CPU multiplies the vertical position value by a magnification factor according to a number of the touch points, and if the CPU determines that the touch points are dragged together along the horizontal axis, the CPU multiplies the trigger position value by a magnification factor according to the number of the touch points.

9. The oscilloscope with touch control as claimed in claim 8, wherein the CPU is connected to the display module, sets up a vertical operation zone for slow movement and a horizontal operation zone for slow movement on the display module, multiplies the vertical position value by a minification factor when determining that the moving trajectory of the single touch point of a single-point drag is located on the vertical operation zone for slow movement, and multiplies the trigger position value by a minification factor when determining that the moving trajectory of the single touch point of the single-point drag is located on the horizontal operation zone for slow movement.

10. The oscilloscope with touch control as claimed in claim 9, wherein

when the touch screen display unit detects the single-point fast drag and throw, the set of continuous coordinates of the moving trajectory of the single-point drag gradually increase, and a distance between final two coordinates is the largest;

and

the CPU has a preset deceleration value, defines the distance between the final two coordinates as a largest movement value when determining that the distance of adjacent two of the set of continuous coordinates progressively increases, constantly varies the trigger position value using the largest movement value, progressively decreases the largest movement value with the deceleration value, and stops varying the trigger position value when the largest movement value is reduced to zero.

11. A touch control operating method of displaying waveform of an oscilloscope with touch control, wherein the oscilloscope has a touch screen display unit for detecting a touch gesture, a pre-trigger count (Tpre) and a post-trigger count (Tpost), wherein the touch gesture is defined by a single-point drag gesture with a single touch point and a multi-point drag gesture with two touch points moving oppositely, and displaying a waveform image, the method is performed after the oscilloscope receives a signal to be tested and has steps of:

receiving a set of waveform processing parameters from the touch screen display unit, wherein the set of waveform processing parameters is generated by the touch screen display unit according to a variation of the detected touch gesture, wherein the set of waveform processing parameters has a vertical position value, a gain value, a sampling rate and a trigger position value;

if detecting the single-point drag, setting up the vertical position value according to a variation of multiple continuous vertical coordinates of the single touch point of the single-point drag and setting up the trigger position value according to a variation of multiple continuous horizontal coordinates of the single touch point of the single-point drag; and

if detecting the multi-point drag, decreasing or increasing the gain value according to a variation of multiple continuous vertical coordinates of the two touch points approaching or departing from each other and decreasing or increasing the sampling rate according to a variation of multiple continuous horizontal coordinates of the two touch points approaching or departing from each other;

adding a DC voltage to the signal to be tested according to the vertical position value;

amplifying the signal to be tested according to the gain value;

sampling the signal to be tested according to the sampling rate, digitizing the sampled signal to be tested to digital data, and storing the digital data

setting up the Tpre and Tpost with a horizontal position h′

according to the following equations;

Tpre=(H×

N/2−

h′

), h′

=h+Δ

h, Δ

h=(Δ

d×

N×

H)/I

Tpost=(H×

N/2+h′

), h′

=h+Δ

h, Δ

h=(Δ

d×

N×

H)/I

where N is a number of horizontal divisions displayed on the oscilloscope, H is a horizontal length per division, h is a previous coordinate of a trigger point in a horizontal direction, Δ

h is a distance of the trigger point moving along the horizontal direction in current operation, Δ

d is a pixel count of the single touch point moving horizontally in current operation and I is a total pixel count of the oscilloscope in the horizontal direction; and

after counting the Tpre, receiving a trigger signal, waiting for a time specified by the Tpost after receiving the trigger signal, and then stopping sampling, reading the digital data with a fixed memory length, processing the digital data to a corresponding waveform image, and outputting the waveform image and displaying the waveform image on the touch screen display unit.