2021/11/07

New updated - "Sound Level Analyzer Lite" ver 6.0

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"Sound Level Analyzer Lite" has been updated to ver 6.0 today.

"Sound Level Analyzer Lite" is a sound level meter app for iPhone.

It is a free app that has simplified the function of "Sound Level Analyzer / PRO".

Simply tap the Start button to measure the sound level. The measured sound level will be displayed in dB.

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#Examples of general environmental noise and noise level:
130dB : Engine sound of Airplane
110dB : Horn of Car
100dB : Noise of passing train
90dB : In loud factory
80dB : In the train, Vacuum cleaner
70dB : Noisy office, Noisy street
60dB : Quiet Car, Normal conversation
50dB : Quiet office
40dB : In the library, Quiet residential area
30dB : Outskirts of midnight, Whisper
20dB : Sounds of rubbing leaves

*Note: The standard noise measurement range is 30 to 130 dBA, and the measured value (Leq) is about 30 dBA in a quiet room. Noise levels are never measured at 0dBA even in very quiet environments.

If you are interested in this app, please click the following link to display on the product information of App StoreTM.

Available_on_the_App_Store_Badge_US-UK_135x40.png

Addendum (December 24, 2021)
Updated to version 6.0.1. Improved stability and expanded iOS support to work on iOS14.7 in addition to iOS15.
posted by toons at 11:13 | News

2021/11/03

New updated - "Sound Level Analyzer" ver 5.0

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"Sound Level Analyzer" has been updated to ver 5.0 today.

"Sound Level Analyzer" is a sound level measurement iPhone app with sound frequency analysis tools.

Available in variety of applications as the neighboring environmental noise measurement, audio system check, vehicle interior noise check, sound check of live events, and more.

"Sound Level Analyzer" has additional analysis modes, which are time graph, frequency realtime analyzer (RTA) and FFT analyzer.

It can be used to analyze the characteristics for the sound/noise source.

# Sound level meter with time transition graph.
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# 1/3 octave band frequency analysis and FFT
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It can also detect the maximum peak level and display the measurement results at that detection time.

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If you are interested in this app, please click the following link to display on the product information of App StoreTM.

Available_on_the_App_Store_Badge_US-UK_135x40.png

( P.S. ) 2021/11/6
Updated to Ver 5.0.1. Replaced a screenshot on the AppStore.
posted by toons at 15:42 | News

2021/10/26

Awata-matsuri festival

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The Awata-matsuri festival was held last weekend at Awata shrine in Kyoto, a festival with a history of over 1,000 years.

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Last year, this festival had been cancelled due to COVID-19. Knowing that this festival would be resumed this year on a smaller scale, I went to see it. Since it is not a famous festival, there were not many spectators outside the neighborhood, so I felt very safe.

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Last Saturday evening, "Yowatari" ritual procession was held to purify the route of the portable shrine for the next day, and the floats were paraded through the town with large lanterns lit.

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These large lanterns were revived in 2008 for the first time in 180 years.

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The students of Kyoto University of the Arts created the lanterns of Isotakeru no Mikoto and next year's zodiac sign, the tiger, in 1/2 scale. There were three of them, including the one made last year.
It was impressive to see the students involved in the making of the lanterns earnestly pulling the large lanterns.

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Hopefully next year we can overcome COVID-19 and the festival can be held on its original scale.
.t
posted by toons at 22:53 | diary

2021/10/20

New updated - "Sound Level Analyzer PRO" ver 4.0

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"Sound Level Analyzer PRO" has been updated to ver 4.0 today.

"Sound Level Analyzer PRO" is an integrated sound measurement app that includes sound level meter and a variety of noise analysis tools.

This app is a more advanced version of the standard noise measurement app "Sound Level Analyzer" and the free app "Sound Level Analyzer Lite".

It can measure the sound level of environmental noise, specific sound sources, music sounds, etc. in real time, and examine their maximum level, minimum level, time average level, etc.

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It has powerful sound analysis capabilities, including real-time frequency spectrum analysis, time-varying level display over time, and sound level statistical analysis (histogram and time-rate sound level). It can also be used for multifaceted analysis of the sound characteristics and frequency trends of a sound source.

# Frequency spectrum analysis(1/3 octave-band analysis, FFT)
slapro_ps_all_octval_2_v410.jpg  slapro_ps_max_v410.jpg

# Time-varying level display
slapro_tc_v410.jpg

# Sound level statistical analysis (histogram and time-rate sound level)
slapro_sa_hist_v410.jpg  slapro_sa_ln_v410.jpg

#Examples of general environmental noise and noise level:
  130dB : Engine sound of Airplane
  110dB : Horn of Car
  100dB : Noise of passing train
   90dB : In loud factory
   80dB : In the train, Vacuum cleaner
   70dB : Noisy office, Noisy street
   60dB : Quiet Car, Normal conversation
   50dB : Quiet office
   40dB : In the library, Quiet residential area
   30dB : Outskirts of midnight, Whisper
   20dB : Sounds of rubbing leaves

*Note: The standard noise measurement range is 30 to 130 dBA, and the measured value (Leq) is about 30 dBA in a quiet room. Noise levels are never measured at 0dBA even in very quiet environments.

If you are interested in this app, please click the following link to display on the product information of App StoreTM.

Available_on_the_App_Store_Badge_US-UK_135x40.png

P.S. (October 28, 2021)
New updated to Ver 4.1. Minor bugs have been fixed and internal processing has been improved. In addition, we have confirmed that this app works properly on the latest OS "iOS 15.1".
posted by toons at 10:57 | News

2021/10/18

Fujibakama and butterfly

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I was walking along Teramachi street in Kyoto when I came across an exhibition of Fujibakama (Eupatorium japonicum) at Kodo Gyoganji Temple.

This Fujibakama is an ancient species that originated in Kyoto over 1200 years ago.

Among the many Fujibakama flowers on display, I found a beautiful butterfly in a large pot!

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This butterfly appeared to be a female Indian Fritillary. The leopard print wings were very eye-catching.

She was engrossed in sucking the nectar from the flowers, even though I was watching her very closely.

It is said that this type of butterfly ingests pyrrolizidine alkaloids, a chemical found in the nectar of Fujibakama flowers, and stores it in its body to protect itself from enemies and as a source of sex pheromones. She may have been intoxicated by this ingredient.

I was very healed by this beautiful butterfly.
.t
posted by toons at 13:09 | diary

2021/10/11

Thanks for the 9th anniversary of TOON establishment.

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Our company celebrated the 9th anniversary of establishment on October 11 today.

With the current pandemic of COVID-19, people around the world are forced to shift to a new lifestyle. As the social environment changes, we will make every effort to provide services and tools that support the creation of a more comfortable living environment.

Thank you very much all for your support and gratefulness.

October 11, 2021

TOON, LLC.
posted by toons at 12:20 | News

2021/10/10

"Jugatsuzakura" in Kyoto Gyoen.

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The declaration of a state of emergency throughout Japan has been lifted on October 1, and I hope that the COVID-19 pandemic will gradually come under control.

I went for a walk in the Kyoto Gyoen Imperial Garden on a sunny day. It's been half a year since I came here to see the cherry blossoms in early spring.

On the east side of "Demizu no Ogawa" creek, pink flowers were blooming! Just like the scene I saw this spring.

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The flowers are called "Jugatsuzakura," a type of cherry blossom that blooms in two seasons, early April and October through winter.

I was able to see it bloom at just the right time. I think it is a new tree that was planted five or six years ago, but I didn't know that it also blooms in autumn.

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This pretty pink flower has healed my heart. It is still in its early stages of blooming, so we will be able to enjoy these pretty flowers for a while.
.t
posted by toons at 23:55 | diary

2021/10/08

New release app - "High-Frequency Noise Monitor"

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"High-Frequency Noise Monitor" has been newly released now!

"High-Frequency Noise Monitor" is a high-frequency noise analysis tool that specializes in high-frequency bands above 8 kHz.

You may be exposed to artificial high-frequency noise on a daily basis that is inaudible to the human ear. This app allows you to monitor such high frequency noises and examine their occurrence.

In general, noise may contain relatively high frequency components depending on its source, and this is classified as high frequency noise.

For example, harmonic noise is radiated from the main body of an electronic device or the power lines of a power conversion device such as an AC-DC power adapter, and depending on its power level, it may affect peripheral devices.

There are also devices that generate high-frequency noise to drive away vermin such as rats and weasels. The frequency of the sound varies depending on the type of vermin, and some devices incorporate sensors to change the volume and frequency over time. When such devices are installed in the vicinity, there are cases where they can lead to noise problems with adverse effects on human health.

High-frequency noise does not often occur at a constant volume or frequency, but often occurs in a certain cycle or randomly. It is not easy to detect such high-frequency noise.

This app records randomly fluctuating high-frequency noise from the iPhone built-in microphone and performs frequency analysis in real time.

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In addition, it retains the PCM data for 20 seconds just before the measurement is stopped, and displays a spectrogram by FFT or the octave band analysis.

The spectrogram is a graph showing the analysis results of the frequency spectrum of sound with time on the vertical axis, frequency on the horizontal axis, and signal strength in colors, allowing visual observation of the occurrence of high-frequency noise.

* Spectrogram by FFT
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* Spectrogram by Octave band analysis.
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We have also released iPhone app, "Mosquitone Detector" which detects high frequency noise and ultrasound. This app has the ability to detect the presence of high frequency noise and search for the direction of the sound source.
We hope our these apps will be useful for dealing with high-frequency noise problems.

If you are interested in this app, please click the following link to display on the product information of App StoreTM.

Available_on_the_App_Store_Badge_US-UK_135x40.png
posted by toons at 18:23 | News

2021/09/18

Hand crafted SP with ONKYO "OM-OF101" vol.6 - finale

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I put into action the addition of a tweeter to increase the high frequency energy of this loudspeaker.

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First, I checked the 30-degree characteristic of the OM-OF101 unit alone again, and found that it gently dropped from above 4KHz.

- Frequency response of OM-OF101 full range (30 degrees)
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If the OM-OF101 unit was to be connected to a tweeter, I felt that an 8k-12kHz crossover was appropriate.

The additional tweeter was an Olasonic super tweeter included in DigiFi No.20 magazine.
I got it about a year ago at a bargain price, and it had been forgotten in a corner of my bookcase, so let's have it sing this time.

First, I tested the frequency response of the super tweeter only, using different capacitors that I have.

There were four types of capacitor capacitance: 0.22μF, 1.0μF, 1.5μF, and 3.3μF. The manufacturers varied, and included some that had been used quite some time ago. I didn't take a picture of them because they looked bad with butyl rubber stains and such.

To match the 30 degree response of the OM-OF101, I measured the frequency response at a 30 degree angle from the front axis of the Olasonic tweeter.

- Frequency response of Olasonic tweeter alone (30 degrees, 0.22μF)
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- Frequency response of Olasonic tweeter alone (30 degrees, 1.0μF)
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- Frequency response of Olasonic tweeter alone (30 degrees, 1.5μF)
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- Frequency response of Olasonic tweeter alone (30 degrees, 3.3μF)
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The 0.22μF capacitance had a low high frequency level. The 1.0μF capacitance extended to 16kHz. The 1.5μF capacitance had a lower level above 10kHz due to the phase. I thought that the 1.0μF capacitance was the safest choice.

Next, I measured the frequency response on the axis. I retreated from the baffle surface by 0 mm / 15 mm / 20 mm.

- Frequency response of OM-OF101+Olasonic tweeter (on axis, 00mm)
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- Frequency response of OM-OF101+Olasonic tweeter (on axis, -15mm)
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- Frequency response of OM-OF101+Olasonic tweeter (on axis, -20mm)
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The offset of 20mm was quite low from 10kHz onwards. In the case of the 00mm offset, which is the same as the baffle surface, it seemed to go down gradually from 4kHz.

The offset of 15mm showed an increase in the high frequency range. This was because the voice coil position of the OM-OF101 unit was around 12-15mm, so I guessed it was standard practice to match the voice coil position. After that, I decided to fine-tune the position while listening.

I could also try changing the polarity, but I decided to play a few songs in this state (C=1.0μF, 15mm from the baffle surface, normal phase) to check the sound.

At first listen, the reproduced sound was clear and crisp in the high frequency range and the center position was clear. Because of the super tweeter, the connection between the mid and high frequencies was natural.

The female vocalist sang without any sense of clutter. The bass line in the low range also seemed to have changed to a tighter direction. This might have been an effect of aging the unit.

Finally, I compared the characteristics with those of the ScanSpeak 10F/8422-03 10cm full-range unit, which was included in the August 2012 issue of Stereo magazine.

ScanSpeak.JPG

I designed this box with a 3.7L capacity and bass reflex rear duct fd=108Hz. The box is designed to be installed horizontally, so I felt it would be a bit uncomfortable if it was installed vertically.

- Frequency response of ScanSpeak 10F/8422-03
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- Frequency response of ONKYO OM-OF101
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Their sound pressure levels seemed to be comparable, but this box had a significant drop below 100Hz. There was a 9 year difference between the two boxes, so it was hard to compare them under the same conditions.
.s
posted by toons at 03:03 | Audio

2021/09/17

Apple "HomePod mini" - Review and frequency response measurement.

I just got the Apple "HomePod mini" as an AirPlay evaluation device. The box was smaller than I had imagined.

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I immediately took it out of the box and tried to set it up, but it took quite a bit of time because I had deleted the Home app or turned off Bluetooth.
After I managed to finish the setup, I can play music from Apple Music app without any problem.

So I decided to measure the frequency response of this device by playing sound from iTunes.

It was measured on a table at a distance of 1 meter with "Audio Frequency Analyzer" (AFA) app.

I played a sine wave at 1kHz to roughly adjust the playback level.
Then I played back pink noise and measured the frequency response by AFA app, holding the peak for about 15 seconds and doing a 1/3 octave band analysis.

- FFT measurement (playback level adjustment: 1m, Sine wave 1kHz)
1kHz.PNG

- Frequency response measurement (1m, Pink noise, 1/3 octave band analysis, HOLD on)
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In this measurement, the levels at 160Hz and 200Hz were a little low, probably due to standing waves, as they also appeared in other speaker measurements.

For the size of the enclosure, the bass extended well down to 63Hz. The high frequency range above 2kHz was about 2 to 4dB lower than the mid range, and the characteristic sound point seemed to be around 12kHz.

The auditory response was close to this frequency response, and the bass feeling was more than I expected, so it was easy to listen to music even at low volume. I felt that the drivers and passive radiator were well designed for this small size.

The HomePod mini does a very good job of playing music for background music!
.s
posted by toons at 01:17 | Audio