CN109758716B

CN109758716B - Rope skipping counting method based on sound information

Info

Publication number: CN109758716B
Application number: CN201910233228.8A
Authority: CN
Inventors: 林叶蓁; 林峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-12-01
Anticipated expiration: 2039-03-26
Also published as: CN109758716A

Abstract

The invention discloses a rope skipping counting method based on sound information, which belongs to the technical field of intelligent fitness sports equipment and comprises the following steps: 1) acquiring audio data of rope skipping actions, extracting audio sampling frequency from the audio data, and drawing an audio waveform diagram with time as an abscissa; 2) setting upper and lower amplitude thresholds to denoise the audio oscillogram; 3) finding out pulse extreme points in the denoised audio oscillogram, calculating the number of the pulse extreme points, and only keeping counting for one time for the extreme points in the same rope skipping period to obtain the initial rope skipping times n; 4) obtaining average pulse interval time T according to initial rope skipping times n₁(ii) a 5) Calculating the interval time T between every two adjacent pulses according to the audio waveform diagram₂If T is₂>3T₁If the rope skipping fails, the rope skipping times are reduced once; 6) and outputting and displaying the rope skipping times. The mechanism analysis of auditory perception is applied, the audio information is judged, automatic counting of rope skipping is achieved, and accuracy is improved.

Description

Rope skipping counting method based on sound information

Technical Field

The invention relates to the technical field of intelligent fitness sports equipment, in particular to a rope skipping counting method based on sound information.

Background

The skipping rope is a sports game in which one person or a plurality of people do various skipping actions in a rope which is circularly swung. The skipping rope is aerobic exercise and is a kind of exercise with higher efficiency in the aerobic exercise, the skipping rope not only can strengthen the cardio-pulmonary function and the muscles of each main part of the body, but also can train the balance sense and the agility of the body, and the skipping rope consumes more heat than running. In addition, the rope skipping movement mode is simple, the limitation of places and weather is not needed, the rope skipping can train the endurance of a human body, a plurality of young people select the rope skipping to perform fat reducing activities, and at present, monitoring equipment aiming at the rope skipping is few in the market.

The skipping rope is a necessary subject for the physical examination of primary and secondary school students, manual counting is needed in the skipping rope process, precious time of a judge is delayed when the number of people is large and counting errors easily occur when the skipping rope speed is high or the attention of the judge is not concentrated. The existing skipping rope capable of automatically counting often has the problems of inaccurate counting, incapability of reversely counting, incapability of lasting service time and the like.

For example, chinese patent publication No. CN108721826A discloses an intelligent skipping rope, a skipping rope counting method and a device, the intelligent skipping rope comprises a rope and a handle; the handle is provided with two ends which are respectively arranged on the rope; the handle comprises a rotating shaft arranged in the middle part, and the rotating shaft is connected with a rope; the handle also comprises a Hall sensor which is arranged on the circumferential outer side of the rotating shaft and corresponds to the magnet, so that the magnet passes through the Hall sensor when the rotating shaft rotates; the handle also comprises an acceleration sensor and a processor, and the processor is connected with the Hall sensor and the acceleration sensor; the processor processes the information acquired by the Hall sensor and the acceleration sensor and judges whether the skipping rope is single-skipping or double-skipping; the handle also comprises a display screen which is electrically connected with the processor.

The Chinese patent document with publication number CN108211317A discloses a record display system for rope skipping competition results, wherein a wireless transceiver module receives information of a plurality of expert scoring information tables and counting information of a plurality of rope skipping handles, and wirelessly transmits data to a control module of a computer terminal; receiving control instruction information of a computer terminal, and sending the control instruction information to each corresponding scorer and each corresponding transmitting handle; the transmitting handle module records and displays rope skipping times data and transmits counting data to the wireless transceiver module in real time; the scoring module stores the record tables of the scores of different types of competitions, receives the control information of the computer terminal and the record tables of the scores of the corresponding competitions, and the referee fills the scores of the competitions through the scoring module, thereby having the functions of handwriting and signature; the scoring module sends scoring scores of the referees to the wireless radio frequency transceiver module; the control module controls and controls the wireless transceiver module, the firing handle module and the scorer module.

The two rope skipping counting methods need to use a specific skipping rope, but the condition of skip jump cannot be eliminated in the rope skipping process, and meanwhile, the problems that the counting is not accurate enough, the counting cannot be performed reversely, the service life cannot be prolonged and the like exist.

Disclosure of Invention

The invention aims to provide a rope skipping counting method based on sound information, which judges audio information by applying auditory mechanism analysis in the rope skipping counting process of people to realize automatic accurate counting of rope skipping.

In order to achieve the above object, the rope skipping counting method based on sound information provided by the invention comprises the following steps:

1) acquiring audio data of rope skipping actions, extracting audio sampling frequency from the audio data, and drawing an audio waveform diagram with time as an abscissa;

2) setting a threshold value of an upper amplitude value and a lower amplitude value to denoise the audio oscillogram;

3) finding out pulse extreme points in the denoised audio oscillogram, calculating the number of the pulse extreme points, and only keeping counting for one time for the extreme points in the same rope skipping period to obtain the initial rope skipping times n;

4) obtaining average pulse interval time T according to initial rope skipping times n₁；

5) Calculating the interval time T between every two adjacent pulses according to the audio waveform diagram₂If T is₂>3T₁If the rope skipping fails, the rope skipping times are reduced once;

6) and outputting and displaying the rope skipping times.

In the technical scheme, the audio fluctuation graph is drawn into a coordinate system according to the audio data information, the time frame is taken as a horizontal axis, and the rope skipping times are calculated according to the number of peak values of the audio fluctuation graph after the rope skipping failure is eliminated. The mechanism analysis of auditory perception is applied, the audio information is judged, automatic counting of rope skipping is achieved, and accuracy is improved.

Preferably, step 1) further includes performing filtering processing on the audio waveform map.

Preferably, the audio data is filtered by using a fast fourier transform method. Because the pulses are very close and can not be identified by naked eyes, the invention adopts a method of setting a certain time interval DT to remove repeated counting and only keeps once.

Preferably, in step 3), a pulse signal generated by rope skipping is obtained according to the audio waveform diagram, and the primary pulse signal is used as a primary rope skipping count.

When rope skipping fails, the interval time between two adjacent pulses is obviously prolonged, so that the method judges whether rope skipping fails or not, and if so, the rope skipping times are reduced once. Preferably, in the step 3), the skipping period is 5000 pulses. Because the sampling frequency is 44.1K, the Ginies world record of personal skipping rope at present is 322 times/minute, the pulse number of each skipping is calculated to be about 7000 times, the invention takes 5000 pulses, and the difference between the pulse number of twice skipping rope and the repeat pulse number of single skipping rope can be distinguished.

For the convenience of counting, step 3) preferably further includes numbering the pulse extreme points.

Preferably, in step 1), a video recording device is used to record the rope skipping action, and then audio data is extracted from the recorded video file. Or the sound recording equipment can be adopted to directly extract the sound data.

Compared with the prior art, the invention has the beneficial effects that:

the rope skipping counting method based on the sound information can realize automatic accurate counting without adopting a special rope skipping, and can not only count immediately, but also play back the recorded sound. Especially, with the wide adoption of mobile shooting and recording equipment, the method has stronger practicability.

Drawings

FIG. 1 is a flow chart of a rope skipping counting method based on sound information according to an embodiment of the present invention;

FIG. 2 is an audio waveform diagram according to an embodiment of the present invention;

FIG. 3 is a diagram of an audio waveform after threshold denoising according to an embodiment of the present invention.

Detailed description of the preferred embodiments

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the following embodiments and accompanying drawings.

Examples

Referring to fig. 1, the rope skipping counting method based on sound information of the present embodiment includes the following steps:

step S1, obtaining, by the video recording device, original video data (. wav) of the rope skipping action.

Step S2, extracting audio data and parameters from the original video data (. wav), extracting the sampling frequency of the audio from the audio data, and drawing an audio waveform diagram with time as the abscissa, as shown in fig. 2.

Step S3, filtering the audio frequency oscillogram by Fast Fourier Transform (FFT); firstly, FFT transformation is carried out on a time domain signal, a frequency range is determined, interference signals which do not belong to the frequency range are filtered, and then Fourier inversion is carried out to return to a time domain.

Step S4, setting upper and lower threshold values to remove especially strong noise and relatively weak interference (which are not caused by rope skipping), and obtaining a clearer pulse waveform diagram, as shown in fig. 3.

In step S5, the pulse extreme points in fig. 3 are found and numbered.

Step S6, the pulse extreme point count in the same rope skipping period is cancelled, the repeated count is removed, the rope skipping period is only kept once, the initial rope skipping frequency n is obtained, and the average pulse interval time T is obtained according to the initial rope skipping frequency n₁。

Step S7, obtaining the interval time T between every two adjacent pulses₂If the time T is spaced₂Is significantly greater than the mean pulse interval time T₁In this embodiment, T is taken₂>3T₁If the rope skipping fails, the rope skipping times are reduced once.

And step S8, outputting and displaying the rope skipping times.

Claims

1. A rope skipping counting method based on sound information is characterized by comprising the following steps:

6) and outputting and displaying the rope skipping times.

2. The rope skipping counting method according to claim 1, wherein the step 1) further comprises filtering the audio waveform.

3. The rope skipping counting method according to claim 2, wherein the audio data is filtered by fast fourier transform.

4. The rope skipping counting method according to claim 1, wherein in step 3), the pulse signal generated by rope skipping is obtained according to the audio waveform diagram, and the pulse signal is used as a rope skipping count.

5. The skipping rope counting method according to claim 1, wherein in the step 3), the skipping rope period takes 5000 pulses.

6. The rope skipping counting method of claim 1, wherein step 3) further comprises numbering the pulse extreme points.

7. The rope skipping counting method according to claim 1, wherein in step 1), a video recording device is used to record rope skipping actions, and then audio data is extracted from the recorded video file.