New updated - "Audio Tone Generator for iPad" ver4.1


「Audio Tone Generator for iPad」 was updated to ver 4.1.

"Audio Tone Generator for iPad" is a high quality Audio Signal Generator app for iPad.

It creates the Audio Reference Signals as Sine waves, Frequency Sweep, White Noise and Pink Noise, and has a high precision of DVD quality and a frequency accuracy of 0.1Hz.

It will help you to make the benchmark for your audio equipment and loudspeakers, your listening environment and room acoustics or your hearing.

The signals created by this app can be best used in conjunction with external devices, such as an audio spectrum analyzer or a sound level meter.




In addition, it can generate Octave band noise in 1/1 or 1/3 octave band. Octave band noise 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.


Please to click the following link to show "Audio Tone Generator for iPad" from App StoreTM. It will be open our product page on App StoreTM.

posted by toons at 11:49 | News

Self-made digital audio cable by pure silver material - FTVS-510 & SLSB


I made a new BNC digital cable for my digital audio system.

By replacing HDD-2TB of HDD audio player "NAC-HD1", I have more opportunities to play HDD audio recently. Since "NAC-HD1" has connected with a full digital amplifier via a digital connection, I decided to create a new digital audio cable.

The parts are those of pure silver material for digital cable originally made by Oyaide Electric in Akihabara.

I tried evaluating the new silver BNC digital cable. Compared to my conventional coaxial cable, it has a lot of information volume, very flat range and fine feeling of sound granulation.

The coaxial cable is "Oyaide FTVS-510", pure silver wire with purity of 5N. It is a 5C2V equivalent cable with a characteristic impedance of 75Ω, so it is quite thick. This cable has an arrow indicating the transmission direction.


The BNC plug is "Oyaide SLSB", the contact pin is pure silver with purity of 4N, the outer material is 24K gold plated brass. The contact pins were machined from 4N pure silver rod with 4 mm thickness with NC machine. The BNC plug is designed to completely match the characteristic impedance 75 Ω and to eliminate signal disturbance due to reflection of the connector part.


Because impedance matching is essential for digital transmission, it is best to connect with BNC for high frequency transmission. In the case of digital audio, it seems that many cases are connected by RCA cable, but the RCA connector is for analog audio connection, the majority of which are not protected by impedance. Naturally, return loss occurs due to impedance mismatch. On the other hand, the BNC standard is is properly specified in the voltage standing wave ratio (VSWR).

Coaxial cable FTVS-510 specification :
- Wire material : 1.05 mm 5 N (99.9995%) Sterling silver skin pass processing
- Structure : Coaxial structure
- Insulator : fluororesin skin layer & foamed polyethylene
- Shield : copper foil & silver plated copper (braid ratio: 95% or more)
- Exterior : UV cut PVC
- Characteristic impedance : 75 Ω
- Capacitance : 56.5 nF/Km
- Wavelength shortening ratio : 74.5%
- Attenuation amount : 23.1 dB/Km
- Conductor resistance : 21 Ω/Km
- Outside diameter : 8.0 mm

BNC plug - SLSB specification :
- Center pin material : 4N pure silver
- Outer Material : Brass 24K gold + Berichrome plating
- Internal insulator : PTFE
- Characteristic impedance : 75 Ω
- Adaptive wire diameter : 9.0 mm
posted by toons at 11:33 | Sound


Aoi matsuri - Kyoto


Aoi Matsuri festival was held, it is one of the three biggest festivals in Kyoto.
It is the solemn festival from the Heian period. I have seen departure of the ceremony at Kyoto Gosho Imperial Palace.


Aoi matsuri festival held on May 15 every year, it is the special festival of Shimogamo Shrine and Kamigamo Shrine which are world heritage sites. In 1400 years ago, this festival began with praying for a rich harvest.


The parade departs in Kyoto Gyosho in the morning and takes about half a day to visit Shimogamo Shrine and Kamigamo Shrine. I was able to see the heroine of Aoi matsuri, Saiodai just in front of my eyes.


A horse ramped right in front of me, a man of Heian clothing fell off horse. Fortunately he seems to have not been hurt.

posted by toons at 23:34 | diary


New updated "Listening Tuner" ver 2.0


"Listening Tuner" was updated to Ver 2.0.

"Listening Tuner" is a new sound amplifier app to assist you better hearing with equalizing many different frequency spectrum sound.

All sound consists of the combination of frequency, strength and tone spectrum. On whether the balance of the three elements is captured how changed the over time, it is determined your audibility.

This app can easily adjust sounds to obtain your optimal hearing experience by using your iPhone mic and headphones. Also you can be a simulated experience of hearing loss.


It helps you to listen comfortable by using our proprietary digital processing technology, Graphic Parametric Equalizer, Preset Equalizer, Noise Suppressor and more sound control functions. On "Replay" function, you can playback your missed listening sound.


Please to click the following link to show "Listening Tuner" from App StoreTM. It will be open our product page on App StoreTM.

posted by toons at 23:55 | News


HDD replacement of HDD Audio Player "NAC-HD1".


I tried to replace the hard disk of the HDD Audio Player "SONY NAC-HD1".

NAC-HD1 was the digital product that became the beginning of network audio equipment, and was released in 2007. The following year, I purchased this product and am using it as a digital audio player.


The original HDD is 250GB, it can be storage 380 hours with Linear PCM, but I already ripped 300 CDs and the remaining capacity was very low. Therefore, I replaced it to 2TB HDD, and it became possible to record up to 3092 hours with Linear PCM.



The original HDD was Seagate product (Seagate barracuda, 250GB, 7200rpm) of the old standard IDE interface. Since the new HDD-2TB (WD AV-GP, 2TB, 5400rpm) is a SATA interface and can not be directly connected, it is connected using a SATA-IDE conversion board.

NAC-HD1 is a Linux-based computer system and does not work with simple HDD replacement. So I cloned the HDD physical image in sector-by-sector at first and moved the final partition to the end of the disk area, then expanded the data partition.


The board in the center of the photo is the CPU board, CPU is Renesas Technology SH7090 (300MHz) and the memory is 64MB. I think that the sound grade is considerably higher than the general PC audio which was built with a personal computer.

Moreover, the custom tuning which raises the data precision of the digital output has been applied by Sound Design, Inc. Linear PCM data can be externally digital output (S/PDIF) with very low jitter.

I am playing sounds by digital connection with the full digital amplifier "FoB SD05" with BNC coaxial cable. The reproduction sound is very fresh and has the feeling of being, so I am always surprised that the detailed information was contained as digital data in the CD so far.


Although I carefully selected the ripping CD so far, so I can enjoy music by riping my favorite CD without any hesitation. I own more than 2000 CDs, so I can still enjoy a lot of music with great sound by the digital ripping of NAC-HD1 in future.
posted by toons at 00:04 | Sound


Information on season's holidays closure

We will be closed from 2018/5/2 PM to 2018/5/6 for the season's holiday.

Regarding inquiries received during the holidays, we will respond sequentially after the holidays.

Thank you for your understanding.

posted by toons at 07:39 | News


Green Leaf of Nanzenji - Kyoto


Last weekend, I took a walk around Nanzenji temple. The contrast between clear blue sky and fresh green leaf was beautiful.


Beautiful green maple was brilliant over the archway of Suirokaku.


Irohamo Mizuji were blooming with pale reddish color. Eventually it will become a propeller-like seed, and fly far in the wind like a helicopter in fall.

posted by toons at 16:31 | diary


Accuphase E-302B


Accuphase's Integrated Stereo Amplifier E-302B.

Accuphase products are generally champagne gold color, but this is a very rare black model. It was released in glossy black finish like a mutation in 1984. It is the fifth generation product as Accuphase's Integrated Stereo Amplifier, and was sold together with E-302 of champagne gold color.

My amplifier has been 33 years old, but there is never a failure like a breakdown. I am still using in my sub audio system as an active machine.

Accuphase's integrated amplifier before this model was sticking to the control amplifier function, but this model seems to be tuned in the direction to increase the freshness of the sound by making the pre part as simple as possible. I think that the sound is not too tight such as so-called Accuphase tone.

Although this amplifier heats up considerably, it seems that troubles are hard to occur owing in order to the simple circuit configuration. I'd like to continue using it for a long time.

The spec of E-302B is as follows. The product catalog is still existed on Accuphase's website now.

Accuphase E-302 : http://www.accuphase.com/cat/e-302en.pdf

posted by toons at 03:45 | Sound


New updated "Colored Noise Generator" ver 2.0


"Colored Noise Generator" was updated to ver 2.0 today.

"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.

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

cobng_white_v200.png cobng_purple_v200.png

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.

cobng_obn_pink_1_v200.png cobng_obn_pink_3_v200.png

Please to click the following link to show "Colored Noise Generator" from App StoreTM. It will be open our product page on App StoreTM.

posted by toons at 07:25 | News


New updated "Low Frequency Detector" ver 1.3.


"Low Frequency Detector" was updated to ver 1.3.

"Low Frequency Detector" is a new acoustic measurement tool for detecting low frequency sound/noise that is hard to hear in the normal situation. This app can display the frequency component of the low frequency sound by examining by 1/3 octave band analysis and FFT analysis.

Low frequency sound is lurking everywhere in everyday life.

Unlike general noise, low frequency sounds are often not noticed easily and there is a property that it is hard to predict the physical influence.

If it is general noise, you may get used to it. However, in many cases the low frequency sound deteriorates physical influences over time.

If there is insomnia or poor physical condition, low frequency sound may be the cause. Please check the presence and source of low frequency sound by using this app to solve your problems.

- Example of low frequency noise detection by 1/3 octave band analysis,


- Example of low frequency noise detection by FFT analysis,


Please to click the following link to show "Low Frequency Detector" from App StoreTM. It will be open our product page on App StoreTM.

posted by toons at 02:05 | News