Spl meter для андроид

App Summary

A Sound Pressure Level (SPL) meter. This app uses the microphone to detect sound and convert it into an SPL value. FOR INDICATION ONLY. Results depend on your device and its hardware.

Features of this SPL meter include:

• Weighting вЂ“ A, C or None . (A weighting filters the high and low frequencies according to how the ear perceives sound loudness). Results are in dB, dBA or dBC depending on weighting.
• Analogue dial to show current SPL value.
• Two speed options.
• Averaging.
• Octaves and third octaves frequency spectrum.
• Time graph of the SPL value.
• Auto-scale or manual (pinch & pan) Y-Axis.
• Relative button вЂ“ if looking for differences, tapping REL will remove the averaged value from the reading.
• Calibrate option вЂ“ if you have a calibrated SPL meter or known loudness source, you can use this option to calibrate the meter.

FOR INDICATION ONLY. SPL will vary depending on how close the source is to the microphone. Microphone sensitivity varies with frequency and from device to device. The range between the noise floor and saturation may be only 20 dB on cheap devices, but could exceed 100 dB on the best devices.

Third Octaves

Settings Menu

Using the App

Once loaded the app will immediately start showing the SPL value in the dial, initiate averaging and reset the maximum and minium values. The dial will show the current SPL value and auto-rotate as necessary. The minimum and maximum values will be shown by blue needles if they are within the range of the dial. Below the dial, the current, minimum, maximum and averaged values are shown. The time in which the averaging has taken place is also shown beside the averaged value.

Below the dial are 4 buttons:

Clear — This clears the minimum, maximum and averaging values.

REL — This will take the averaged value and use it to offset subsequent readings such that the reading is relative to the first measured sound. Useful if you want to see if something is louder (positive dB) or quieter (negative dB) than that sound. Pressing REL again removes this offset. Pressing REL also resets the minimum, maximum and averaging.

Info — This brings up a help screen with a brief explanation, a link back to this web page & other relevant info.

Pause — This pauses the measurement. Press again to unpause.

Below the first 4 buttons is a digital display whose content will vary depending on the bottom four buttons:

Settings — This opens up a settings menu from which some options can be changed.

Spectrum — This places a spectrum in the digital display consisting of octave or third octave bands as selected in the settings menu. The maximum values in each band is shown by a blue bar.

Graph — A time series graph of the SPL values. There are 3 speed options for the graph as selected in the settings menu.

CAL — This gives the option to calibrate against a known device to give better results in a particular noise band.

If in manual y-axis mode then panning or pinching the y-axis will scale or shift the y-axis accordingly. The manual or auto-scale y-axis option is found in the settings menu.

Weighting

Human hearing ranges from 20 Hz up to 20 kHz. The perceived loudness of sound varies over this range with sounds at the edges of this range perceived quieter. To take into account human hearing, the sound is often weighted based on its frequency to give a better indication of the sound level. The A and C weighting curves are defined in IEC 61672:2003 with A weighing being the most commonly used. To indicate that A or C weighing is used, a letter is added to dB to give dBA and dBC respectively. The following graph shows how the three weighting options available in the app are applied over the 20-20kHz frequency range.

Calibration

To calibrate, first press the CAL button. The CAL display lets you measure up to three calibration points and enter the actual value of them. The actual value can be determined from a calibrated SPL meter beside the device or a volume source of known volume. If not available, the CAL can still be use to adjust the reading up or down if you believe it is incorrect on your device. Any cal values are stored on exiting and restarting the app. To clear any calibration values, tap clear CAL. Tapping cancel exits the calibration mode. Tapping Set CAL will set the new calibration based on the data in the table. At least one data point and corresponding actual value is required before a new calibration can be set.

Tapping the measurement box, will cause the SPL to be measured. The duration of the measurement can be set in the settings menu as 1s, 4s, 12s or 30s. A blue progress ring appears and counts down the measurement time. If a delay is chosen, again in the settings menu (0s, 2s, 10s or 30s), then a red countdown will first appear and countdown until the measurement starts. After the measurement the measured value in decibels is shown. If the weighting mode is dBA or dBC then it will be in those units respectively.

Tapping the enter actual box will allow you to type in the value which is measured value should have been (e.g. based on the calibrated SPL meter that was measuring at the same time).

Depending on the number of data points entered, the calibration will be an offset, a linear, or a polynomial fit to the data points from which future SPL values will be calculated.

Calibration points should be chosen to reflect the measurement range being tested. If one point is used, it should be as close as possible to the target sound level. If two points are used, they should be at each end of the range being used. If a third calibration point is used, it should be midway between the first two.

Note that even after calibration the app should still be classified «for indication only».

Time Graph

Calibration

A little technical detail

The app uses a Fast Fourier Transform (FFT) with 16384 data points sampled at 44.1 kHz over 0.37 s. The FFT data is then weighted based on the weighting option selected before being converted into decibels and adjusted based on any calibration and being placed into bands corresponding to the octave or third octave divisions. For the long time constant, the data is averaged over 1 second with higher weighting given to the newest data.

Octave bands are centered around 1 kHz. If a FFT bin fits across several octave or third octave bins it is shared between the two bands according to the percentage of that bin in each band. At low frequencies, there are only a few bins in each third octave such that there will be more jumping around in the low frequency band values compared to the higher frequency bands which should be more stable.

Finally, remember this app is FOR INDICATION ONLY. Use a calibrated sound meter where it is required.

Источник

Measuring Center for Android and iOS

Программное обеспечение SPL-LAB — Measuring Center

Простой интерфейс
Поддержка встроенного микрофона планшета или телефона
Высокая скорость работы
Уникальные алгоритмы
Поддержка Bluetooth и USB OTG
Поддержка Android и iOS

Описание
Видео
Статьи
Поддержка
Гарантия
Задать вопрос

Описание

В современном мире планшеты и смартфоны с каждым днем все глубже проникают в нашу жизнь. Уже сравнимые по мощности с персональными компьютерами, гаджеты отвоевали себе большую долю потребительского рынка, вытесняя ПК. Для широкого потребителя мобильное устройство уже полностью заменило функционал компьютера, но специфические задачи, по-прежнему, решаются только на ПК. В основном это происходит из-за отсутствия необходимого программного обеспечения. Наша компания идет в ногу со временем и предоставляет своим пользователям возможность использования мобильных устройств для измерения и анализа звука. Мы разработали приложение для спектрального анализа звука под Android. Приложение Measuring Center for Android — это упрощенная версия программы для ПК, но с по-прежнему богатым функционалом. Интерфейс программы интуитивно понятен и прост в использовании. Поддерживается работа как с проводными устройствами Spl-Lab (USB Bass Meter, USB RTA Meter и т.д.), так и с беспроводным Wireless Bass Meter. Возможность проведения измерений, с использованием встроенного микрофона устройств Android!

Поддерживаемые устройства в Google Android(рекомендуется установка бесплатной версии для проверки соединения перед покупкой полной)

Wireless Bass Meter(все версии)
LCD Bass Meter(Second Edition)
NEXT-LCD с использованием адаптера USB OTG и USB хаба или USB Y-кабеля для внешнего питания прибора
NEXT-USB с использованием адаптера USB OTG и USB хаба или USB Y-кабеля для внешнего питания прибора
USB Bass Meter(все версии) с использованием адаптера USB OTG и USB хаба или USB Y-кабеля для внешнего питания прибора
USB Bass Meter PRO с использованием адаптера USB OTG и USB хаба или USB Y-кабеля для внешнего питания прибора
USB RTA Meter PRO с использованием адаптера USB OTG и USB хаба или USB Y-кабеля для внешнего питания прибора
USB Noise Meter PRO с использованием адаптера USB OTG и USB хаба или USB Y-кабеля для внешнего питания прибора

Поддерживаемые устройства в Aplle iOS

Wireless Bass Meter(Second Edition)
Wireless Bass Meter(Third Edition)
USB Bass Meter(1 версия без доп. порта) с использованием адаптера Apple Camera Connection Kit(A1440) и USB хаба или USB Y-кабеля для внешнего питания прибора
USB Bass Meter PRO с использованием адаптера Apple Camera Connection Kit(A1440) и USB хаба или USB Y-кабеля для внешнего питания прибора
USB RTA Meter PRO с использованием адаптера Apple Camera Connection Kit(A1440) и USB хаба или USB Y-кабеля для внешнего питания прибора
USB Noise Meter PRO с использованием адаптера Apple Camera Connection Kit(A1440) и USB хаба или USB Y-кабеля для внешнего питания прибора

Функции

Поддержка встроенного микрофона устройств
Измерение Амплитудно-частотной характеристики (АЧХ) сигнала – отображение спектра
Отображение формы сигнала
Измерение коэффициента гармонических искажений сигнала
Измерение уровня звукового давления (SPL, dB Drag, IdBL, ESPL, AMT и др.)
Линейное и логарифмическое представление спектра
Измерение амплитуды пиковой составляющей спектра и ее частоты
Измерение среднего во времени уровня звукового давления (Bassrace, Bass Boxing, AMT SPL-Show и др.)
Измерение средневзвешенного звукового давления(SQL)
Поддержка проводных и беспроводных устройств Spl-Lab

Компания Spl-Lab предоставляет гарантию на все проданное оборудования сроком 12 месяцев с момента приобретения. Гарантия предусматривает ремонт оборудования в сервисном центре за счет производителя или замену на аналогичное оборудование.
Гарантия распространяется на дефекты, возникшие по вине производителя, и не покрывает механические повреждения или нарушение условий использования и хранения.
Действие гарантии прекращается в случае ремонта либо попыток ремонта оборудования лицами / организациями, не авторизованными компанией Spl-Lab.
Гарантия не покрывает возможного ущерба, потери прибыли, утраты данных и иных прямых или косвенных потерь, связанных с неисправностью оборудования.
Гарантийное обслуживание продукции приобретенной через третью сторону (дистрибьютора), осуществляется через третью сторону.
Решение о произведении гарантийного ремонта или замены, принимается на основании технической экспертизы, осуществляемой в сервисном центре Spl-Lab.

Wireless Bass Meter(Third Edition)

Можно подключать внешние сенсоры! До 190дБ! Работает с iPhone, iPad, Android и Windows. USB и WiFi. Новый…

Smart Voltmeter

Основными функциями Smart Voltmeter являются: измерение точных характеристик напряжения автомобильный…

USB RTA Meter (Pro Edition)

USB микрофон для измерения АЧХ и гармонических искажений аудио сигналов. Он услышит даже полет мухи!

Источник

SPL Meter 4+

Andrew Smith

Для iPad

- Музыка: № 107 в этой категории
- 3,0 • 1 оценка

- 99,00 ₽
- Включает встроенные покупки

Снимки экрана

Описание

SPL Meter is a professional-grade sound level meter, also known as a decibel or dB meter, for your iPhone, iPad or iPod touch.

Modeled after a traditional analog SPL meter, we have faithfully reproduced all the characteristics and qualities found in those meters, including the ballistics, ranges, filters, and decay rates.

Under the hood we have advanced DSP-based algorithms that meet or exceed ANSI / IEC Type 1 standards. And starting with iOS 6, we can disable the mic filters and limiters, to get the real world performance of a hand-held SPL meter.

And now, upgrade SPL Meter with iTestMic, our pro-grade test & measurement mic, made specifically for iOS devices. Using iTestMic with SPL Meter, you get a calibrated, accurate SPL Meter, that meets industry standards for Type 2 performance. See our website for more information.

But don’t compare us to a Radio Shack meter, ours is much more accurate!

We have also included a digital LCD display, as shown in the image, to make this the best SPL meter available for iPhone or iPad. And this is something that the old analog meters never had!

The screen will flip when you flip the phone over, so that you can point the iPhone mic directly at the sound source. (iPhone X does not support upside down mode)

SPL Meter is a universal app — buy once, and use on all of your iOS devices.

SPL Meter is built by the same team that created the other great professional audio and acoustics apps on the store, Studio Six Digital. Built on the engine of our more expensive «SPL» app, SPL Meter’s filters and decay rates meet or exceed ANSI type 1. This app is not a toy or a game.

SPL Meter is the one audio app that everyone who works in audio must have on their phone! Not only have we made the best one, but we’ve priced it so you can’t afford not to get it.

FILTERS — A and C weighting filters are provided.

DECAY — Choose ANSI Fast or Slow.

RANGES — 40dB to 120dB in 9 ranges.

CALIBRATION — Comes pre-calibrated for the typical iPhone or iPad built-in and headset mic, but you can adjust the calibration if you have a professional, calibrated meter to compare it to. Accesses our cloud-based iOS device calibration database, which we updates as new devices are released.

INTERNAL / EXTERNAL MIC — Select Internal to activate the included compensation filter, which is designed to flatten the frequency response of the built-in or headset mic. External will work with our iPhone Measurement Mic, to be released later this summer. See our website for more details.

SPL Meter is bargain-priced to make it easy for anyone to check out one of our professional, accurate apps. Studio Six Digital is dedicated to making the iPhone and Touch a professional audio and acoustics test device.

Check out our full line of professional-grade audio and acoustics apps: SPL, the professional digital iPhone sound level meter, SPL Graph, for recording SPL over time, RTA, a 1/3 octave real-time analyzer, FFT, for detailed acoustic analysis, ETC, the energy-time curve function, RT60, for automated octave-band decay time measurement, Speaker Pop, to test speaker polarity, and Generator, the iPhone signal generator.

Also, if you are looking for more great acoustical and audio test apps, have a look at AudioTools, our premier app for audio professionals.

Источник

Spl meter для андроид

SPL Meter 1.11

(Счетчик SPL)

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