CN105005478A - Volume measurement method based on Android platform mobile equipment - Google Patents
Volume measurement method based on Android platform mobile equipment Download PDFInfo
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- CN105005478A CN105005478A CN201510449292.1A CN201510449292A CN105005478A CN 105005478 A CN105005478 A CN 105005478A CN 201510449292 A CN201510449292 A CN 201510449292A CN 105005478 A CN105005478 A CN 105005478A
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Abstract
The invention discloses a volume measurement method based on Android platform mobile equipment. The volume measurement method comprises the following steps: 1) utilizing Android AudioRecord APIs (Application Program Interface) to obtain audio data; 2) taking out buffer content which stores the audio data to carry out quadratic sum operation; 3) dividing a quadratic sum by the total length of the data to obtain volume; and 4) comparing the obtained volume with a standard value. Equipment used by the method is simple, and the method can be finished by the traditional Android platform mobile equipment including mobile phones, tablet computers and the like. A measurement process is simple, a measurement result is accurate, and a noise warn can be effectively provided.
Description
Technical field
The present invention relates to volume field of measuring technique, specifically a kind of volume measuring method based on Android platform mobile device.
Background technology
Noise pollution has been a large persistent ailment of modern society environment.No matter be that prevention or noise control pollute, all first must measure volume.By measuring volume, provide foundation for taking the measure such as sound insulation or noise reduction.Measured equipment all more complicated and costlinesses of volume in the past.
Android multimedia framework includes capturing and the support of audio frequency of coding multiple format.Voice data can be obtained by the AudioRecord APIs using Android to provide on the basis of hardware supported.Android supports following audio format encoding and decoding:
Summary of the invention
The problem to be solved in the present invention is to provide a kind of volume measuring method based on Android platform mobile device, and use the volume based on Android platform mobile device measuring and calculating surrounding environment, equipment is simple, with low cost.
A kind of volume measuring method based on Android platform mobile device of the present invention, comprises the following steps:
1) Android AudioRecord APIs is utilized to obtain voice data;
2) the buffer content of stores audio data is taken out, carry out quadratic sum computing;
3) quadratic sum is again divided by data total length, draws volume;
4) volume obtained above and standard value are compared, when volume is more than or equal to standard value, give a warning.。
Utilize Android AudioRecord APIs to obtain voice data, preferred method is:
11) a newly-built AudioRecord object:
111) statement also initialization Int type audio sample rate base value SAMPLE_RATE_IN_HZ=8000;
112) according to the spatial cache value initialization Int type variable BUFFER_SIZE of the stores audio data of AudioRecord acquisition, the method needs to import following parameter into: audio sample rate base value, sound channel form, voice-coding format.
12) AudioRecord object acquisition voice data is utilized:
121) a newly-built sound collector object, for sound source data collection, needs to import following parameter into: include the description of equipment of sound, audio sample rate base value, sound channel form, voice-coding format, spatial cache sizes values;
122) utilize step 112) BUFFER_SIZE variate-value as the buffer Buffer Pool of the newly-built structure of arrays of array length, for depositing voice data;
123) statement also initialization Int type variable r, initial value is 0;
124) step 121 is utilized) the sound collector object acquisition voice data that creates be assigned to the Int type variable r of step 123.
Described step 2) the buffer content of stores audio data to be taken out, the process of carrying out quadratic sum computing comprises:
211) statement also initialization long type variable v, initial value is 0;
212) traversal step 122) buffer Buffer Pool data, and each quadratic sum be added after be added to 7 steps definition variable v on, be v assignment.
Described step 3) quadratic sum, again divided by data total length, show that the process of volume is:
221) state a double type variable mean, and the value after variable v is divided exactly variable r is assigned to variable mean;
222) state a double type variable volume, and to get with 10 after the variable mean of 9 steps is carried out 10 powers be the truth of a matter, and logarithm value is assigned to volume.
In described step 4), institute's accepted standard value is 85 decibels, is normal lower than 85 decibels, is equal to or higher than 85 decibels then for abnormal, carries out alarm prompting time abnormal to user.
Volume measuring method based on Android platform mobile device of the present invention, the equipment of use is simple, and can utilize existing Android platform mobile device, such as mobile phone, panel computer etc. complete.Measuring process is also comparatively simple, and measurement result is accurate, can effectively provide noise to warn.The field of application is extensive, such as, the volume value of environment residing for monitoring children under guardianship, reflect whether the current residing environment of children under guardianship exists potential safety hazard, thus facilitate guardian to take measures in time guarantee children under guardianship healthy and safe of maximum possible, under the prerequisite ensureing effectively monitor the decibel value of environment residing for children under guardianship, cost-saving to greatest extent.
Embodiment
Below a kind of volume measuring method based on Android platform mobile device that the present invention proposes is described in detail.
A kind of volume measuring method based on Android platform mobile device of the present invention, comprises the following steps:
The first step, utilize Android AudioRecord APIs obtain voice data:
11, a newly-built AudioRecord object.
A newly-built AudioRecord object comprises following process:
111, statement also initialization Int type audio sample rate base value SAMPLE_RATE_IN_HZ=8000;
112, according to the spatial cache value initialization Int type variable BUFFER_SIZE of the stores audio data of AudioRecord acquisition, the method needs to import following parameter into: audio sample rate base value, sound channel form, voice-coding format.
12, AudioRecord object acquisition voice data is utilized.
AudioRecord object acquisition voice data is utilized to comprise following process:
121, a newly-built sound collector object, for sound source data collection, needs to import following parameter into: include the description of equipment of sound, audio sample rate base value, sound channel form, voice-coding format, spatial cache sizes values;
122, utilize the BUFFER_SIZE variate-value of step 112 as the buffer Buffer Pool of the newly-built structure of arrays of array length, for depositing voice data;
123, statement also initialization Int type variable r, initial value is 0;
124, the sound collector object acquisition voice data utilizing step 121 to create also is assigned to the Int type variable r of step 123.
Realize utilizing the program code of Android AudioRecord APIs acquisition voice data as follows:
static final int SAMPLE_RATE_IN_HZ = 8000;
static final int BUFFER_SIZE = AudioRecord.getMinBufferSize(SAMPLE_RATE_IN_HZ, AudioFormat.CHANNEL_IN_DEFAULT, AudioFormat.ENCODING_PCM_16BIT);
(BUFFER_SIZE: for storing the cache size of the voice data of collection;
SAMPLE_RATE_IN_HZ: audio sample rate, in units of hertz;
The audio channel of AudioFormat.CHANNEL_IN_DEFAULT:Android acquiescence;
AudioFormat.ENCODING_PCM_16BIT: the coded format that voice data is adopted.
AudioRecorder recorder = new AudioRecorder(MediaRecorder.AudioSource. MIC, SAMPLE_RATE_IN_HZ, AudioFormat.CHANNEL_IN_DEFAULT, AudioFormat.ENCODING_PCM_16BIT, BUFFER_SIZE,);
MediaRecorder.AudioSource. MIC: microphone
short[] buffer = new short[BUFFER_SIZE];
int r = 0;
r = mAudioRecord.read(buffer, 0, BUFFER_SIZE);
Second step, voice data to be processed:
21, the buffer content of stores audio data is taken out, carries out quadratic sum computing:
211, statement also initialization long type variable v, initial value is 0;
212, the buffer Buffer Pool data of traversal step 122, and be added to after each quadratic sum is added on the variable v of 7 step definition, be v assignment.
22, quadratic sum is again divided by data total length, draws volume, and unit is decibel:
221, state a double type variable mean, and the value after variable v is divided exactly variable r is assigned to variable mean;
222, state a double type variable volume, and to get with 10 after the variable mean of 9 steps is carried out 10 powers be the truth of a matter, and logarithm value is assigned to volume.
Realize the code that second step processes voice data as follows:
long v = 0;
for (int i = 0; i < buffer.length; i++) {
v += buffer[i] * buffer[i]}
double mean = v / (double) r;
double volume = 10 * Math.log10(mean);
3rd step: the volume obtained above and standard value are compared
31, volume variate-value step 222 obtained and Int value 85 compare, if volume>85, then and announcement server alarm, otherwise, proceed to measure.Namely the technical program selects 85 decibels for standard value, is normal lower than 85 decibels, is equal to or higher than 85 decibels then for abnormal, now will carries out alarm prompting to user.
Code of illustrating be only a kind of form realizing said method, can also with other codes implement said methods.
The workflow of service routine codes implement method of the present invention is:
One, application program is write according to the inventive method;
Two, disposing application program is to Android device;
Three, the server of receiving alarm information is disposed;
Four, runtime server receiving end, the application program of in opening steps two, Android device being installed in advance;
Five, when step 2) testing of equipment when being greater than 85 to the volume value of residing environment, feed back to server warning information;
Six, server end does respective handling according to warning information.
Above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., it all should be encompassed in the middle of right of the present invention.
Claims (7)
1., based on a volume measuring method for Android platform mobile device, it is characterized in that, comprise the following steps:
1) Android AudioRecord APIs is utilized to obtain voice data;
2) the buffer content of stores audio data is taken out, carry out quadratic sum computing;
3) quadratic sum is again divided by data total length, draws volume;
4) volume obtained above and standard value are compared, when volume is more than or equal to standard value, give a warning.
2. the volume measuring method based on Android platform mobile device according to claim 1 is characterized in that, the process utilizing Android AudioRecord APIs to obtain voice data is:
11) a newly-built AudioRecord object;
12) AudioRecord object acquisition voice data is utilized.
3. the volume measuring method based on Android platform mobile device according to claim 2 is characterized in that, the newly-built AudioRecord object of described step 11) comprises following process:
111) statement also initialization Int type audio sample rate base value SAMPLE_RATE_IN_HZ=8000;
112) according to the spatial cache value initialization Int type variable BUFFER_SIZE of the stores audio data of AudioRecord acquisition, the method needs to import following parameter into: audio sample rate base value, sound channel form, voice-coding format.
4. the volume measuring method based on Android platform mobile device according to claim 1 is characterized in that, described step 12) utilizes AudioRecord object acquisition voice data to comprise following process:
121) a newly-built sound collector object, for sound source data collection, needs to import following parameter into: include the description of equipment of sound, audio sample rate base value, sound channel form, voice-coding format, spatial cache sizes values;
122) utilize step 112) BUFFER_SIZE variate-value as the buffer Buffer Pool of the newly-built structure of arrays of array length, for depositing voice data;
123) statement also initialization Int type variable r, initial value is 0;
124) step 121 is utilized) the sound collector object acquisition voice data that creates be assigned to the Int type variable r of step 123.
5. the volume measuring method based on Android platform mobile device according to claim 1 is characterized in that, described step 2) the buffer content of stores audio data to be taken out, the process of carrying out quadratic sum computing comprises:
211) statement also initialization long type variable v, initial value is 0;
212) traversal step 122) buffer Buffer Pool data, and each quadratic sum be added after be added to 7 steps definition variable v on, be v assignment.
6. the volume measuring method based on Android platform mobile device according to claim 1 is characterized in that, described step 3) quadratic sum, again divided by data total length, show that the process of volume is:
221) state a double type variable mean, and the value after variable v is divided exactly variable r is assigned to variable mean;
222) state a double type variable volume, and to get with 10 after the variable mean of 9 steps is carried out 10 powers be the truth of a matter, and logarithm value is assigned to volume.
7. the volume measuring method based on Android platform mobile device according to claim 1 is characterized in that, in step 4), institute's accepted standard value is 85 decibels, be normal lower than 85 decibels, be equal to or higher than 85 decibels then for abnormal, time abnormal, carry out alarm prompting to user.
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| CN107743279A (en) * | 2017-10-09 | 2018-02-27 | 维沃移动通信有限公司 | A kind of earphone noise-reduction method, earphone and mobile terminal |
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| CN107743279A (en) * | 2017-10-09 | 2018-02-27 | 维沃移动通信有限公司 | A kind of earphone noise-reduction method, earphone and mobile terminal |
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