Nijo-jo castle - free admission


Yesterday, I went to Nijo-jo castle in Kyoto.

Commemorating the 30th anniversary of the Enthronement of His Majesty the Emperor, it was free admission to Nijo-jo castle on 24 February.

Despite the cold winter season, it was crowded with many tourists and visitors.


Otemon gate and Karamon gate were restored in recent repair projects. But Honmaru-goten palace was under restoration and I could not see at all.


Ninomaru Goten palace was open, so I could enter its inside. It is regrettable that I can not show them because photography is prohibited.


In plum forest, plums began to bloom cleanly. The contrast with the moat was very nice.
posted by toons at 23:56 | diary


FAQ-A013 : What is "Octave Band Noise"?

FAQ-A013 : What is "Octave Band Noise"?

[Answer] "Octave Band Noise" is a noise signal that extracts only energy of a bandwidth of a certain one octave frequency with respect to white noise and pink noise.

The noise signal can be used for various purposes as a reference sound source for environmental sound measurement, sound tuning, auditory effects like tinnitus relief and sound masking.

Our app "Colored Noise Generator" provides an octave band noise can be output programmably.

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I will explain "Octave Band Noise" in more detail. An octave is a pitch that doubles the ratio of frequencies to a certain frequency. And the octave band is the bandwidth of the frequency where the ratio of the upper and lower frequencies centered on a certain frequency is exactly one octave. The center frequency of this octave band is called the center frequency, and the frequency band for the center frequency fo ranges from the lower limit frequency fo/√ 2 to the upper limit frequency fo*√2. For example, the center frequency of an octave band is 1 kHz, 2 kHz, 4 kHz ,,,, and one octave is divided into three in the 1/3 octave band.

"Octave Band Noise" is a noise signal that extracts only a specific frequency band with the band-pass filter with the octave band characteristics. Using the noise, it is possible to evaluate only the target frequency band. By measuring the pink noise of a specific frequency band with a real-time analyzer, it is possible to make sound adjustments and measure noise source characteristics that are not affected by other frequency bands.

The figure below shows an example of generating 1/1 octave band noise at the center frequency (1000 Hz and 4000 Hz) with white noise as the source signal. It is FFT analysis result by our audio analyzer app "Audio Frequency Analyzer". Since this measurement result is an instant observation value, it can obtain a flat frequency characteristic within the octave band in time averaging.

posted by toons at 23:57 | FAQ


Plum blossoms blooming ! - Kyoto Gyoen National Garden


At Kyoto Gyoen National Garden, Plum blossoms around "Demizu no Ogawa" are blooming now. It is evidence that the winter's cold peak has passed and it is getting gradually warmer now.


Red plum blossoms are a little blooming ahead.


Wintersweet was also beautifully blooming!
posted by toons at 23:53 | diary


Kyoto marathon


I went to cheer for the Kyoto marathon.


This year 16,000 runners took part. About 5 hours after starting from 9 o'clock in the morning, a lot of people were finished running safely at the goal line in front of Heian Jingu in Okazaki.


The time limit on the race was a rest of 40 minutes, a lot of runners came back to the goal. It was hard work for a long time in the cold!


Since the extraordinary issue of the Kyoto newspaper was dealt, I got it in this memorial.
posted by toons at 23:29 | diary


New updated - "Colored Noise Generator" ver 3.0 - Free of charge!


"Colored Noise Generator" was updated to Ver 3.0.

”Colored Noise Generator" is a new noise generator that can be used to as the sound source for a variety of acoustic measurement and auditory effects.

In the latest version, newly supported Bluetooth communication and continuous playback.

This app can generate standard noise signals such as white noise, pink noise, brown noise, blue noise, purple noise and gray noise.

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In addition, it can generate a specific octave band noise signal by using the band-pass filtering of 1/1 octave band with ideal steep attenuation characteristics.

Octave band noise can be used for various purposes as a reference sound source for environmental sound measurement, sound tuning, tinnitus relief and sound masking.

Octave band noise can be created as a multi-band coupling signal by 1/1 octave band filter with a center frequency from 63Hz to 8kHz.

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Octave band noise is also useful to adjust the characteristics of the audibility of earphones or headphones. For example, by selecting the pink noise and playing the 1/1 octave band noise in the order of 125Hz, 1KHz, 8kHz of the center frequency, you can determine the intensity of each frequency band on the audibility. If you know the characteristic of frequency band, you will be able to adjust the earphone in the equalizer to your favorite sound easily.

Please to click the following link to see the app information. It will be open the product page on AppStore.

posted by toons at 18:56 | News