Support / SLM

Sound Lissajous Meter

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"Sound Lissajous Meter" is a new sound analysis app that displays audio signals in Lissajous curves.

Lissajous is a planar figure obtained by combining two single vibrations vibrating in directions perpendicular to each other.

This app can be displayed in a two-dimensional curve by Lissajous in the vertical axis as a microphone input signal and the horizontal axis as a reference sine wave.

For example, when a sine wave with the same frequency as the reference sine wave is reproduced from an audio system, you can observe changes of the frequency or phase in a Lissajous curve pattern.

In the case of an unknown sound source, you can analyze the source using the correlation between amplitude, frequency and phase and the reference sine wave.

In addition, It can display Lissajous demo according to changes in frequency and phase. Please use for Lissajous pattern understanding and learning.


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Please to click the following link to download "Sound Lissajous Meter" from App StoreTM. It will be open the download page on App StoreTM.


It will move to another site, download from Apple Store


Communications charges when connecting to the App Store will be borne by the customer.
iPhone, AirPlay is a trademark of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc.

Products Information

Version : 1.0
Release date : March 20, 2019. UTC
Size : 0.5 MB

Category : Utilities, Education
Recommendation : Requires iOS 12.1.4 or later.

Features

Lissajous sound visualizations (X: internal reference signal, Y: microphone input signal)
Internal reference signal / sine wave (reference sine frequency): 100, 125, 160, 200, 150, 250, 315, 400, 500, 630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.15k, 4k, 5k (Hz) (18 types)
Input level adjustment (input signal gain)
Jitter adjustment (jitter): ± 2.0 (0.01 step)
Noise filter (filter)
Demo display (Let's draw Lissajous!): Lissajous curve sample display
Optimized for iPhone, Compact code size.

Applications

Checking phase of room acoustics or monitoring changes in amplitude, phase and frequency from place to place.
Analysis of unknown sound signal.
Monitoring and analysis of environmental sounds.
Sound Visualizer

Operation procedure

"Sound Lissajous Meter" displays audio signals in Lissajous curves in real-time.


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The basic operation procedure is as follows:


(1) Adjustment of input signal gain : By adjusting the gain of the input signal, you can resize the Lissajous curve of the measurement display to an appropriate size.

(2) Selection of reference frequency: Select the frequency of reference signal (sine wave).

(3) Filter: Turn on the noise filter if the input signal contains a lot of noise and the measurement display is unstable. The default is filter off.

(4) Jitter correction: Jitter correction is performed when the phase of the measurement display is unstable, such as rotation. The frequency of the reference signal can be adjusted in the range of ± 2 Hz.

(5) Snapshot: Save the measured image to “Photos” library.


Operation demo

Lissajous measurement

It can be displayed in a two-dimensional curve by Lissajous in the vertical axis as a microphone input signal and the horizontal axis as a reference sine wave.

you can analyze the source using the correlation between amplitude, frequency and phase and the reference sine wave.

In addition, the waveform display of the input and reference signals and the phase θ between both signals are also displayed simultaneously. The phase θ is valid only when the reference frequency and the measurement frequency are the same.


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Input signal gain

Adjust the Lissajous curve of the measurement display to the appropriate size by adjusting the gain of the input signal.

Enabling the noise filter may reduce the level of the input signal extremely. Adjust the input level to make it easy to see the amplitude of Lissajous.

Reference frequency

It generates a sine wave as a reference signal. You can select one frequency from the frequency range of 100Hz to 5kHz (18 points).

Filter

If the input signal contains a lot of noise and the measurement display is unstable, you may enable the noise filter. The default is filter OFF. The filter takes out the exact maximum frequency of the frequency components contained in the input signal.

Jitter

It can slightly adjust the jitter between the reference frequency and the input signal. The range is ± 2 Hz per 0.01 Hz unit. The default is 0 Hz.

The jitter adjustment can reduce the rotation of the phase angle when Lissajous curve's phase changes sequentially at the same observation position. But, the correction may not be possible if the phase change is severe.

Snap

If you tap "Snap" button, you can capture the measured image to Photos. At the first time, the confirmation of access to Photos is required once from iOS system when you press "Snap" button.


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Lissajous demo

Tap "info" button to switch to the information screen. If you tap the "Let's draw Lissajous !" button, it move to Lissajous demo.

By changing both the frequency ratio and the phase, you can see Lissajous curve.

It will draw a Lissajous curve of the signal to be generated by the following equation.

# x-axis: cos(w1*t)

# y-axis: cos(w2*t+δ)

(frequency ratio: w1:w2 = 0.25 to 4.0) (phase: δ = ±180 degree)

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Info

By tapping "info" button, it is displayed the product description and Lissajous demo. If you tap "support" button, Safari starts and you can see our support page. By tapping "close" button, it will move to the top view.


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Release Information

Sound Lissajous Meter 1.0 was released on March 20, 2019. UTC

Note

The internal reference signal and the measured signal are asynchronous. Since the signals from the microphone and other external inputs are not synchronized, the synchronization relationship is not guaranteed by stop/start, change of various parameters, etc.
The phase θ is valid only when the reference frequency and the measurement frequency are the same.
At the time of the first access to Microphone and Photos after installing the app, you will be asked authorization to access them by the iOS system. If you have not enabled this setting, the app can not access them by privacy restrictions of the iOS system. Please enable the access permission on the iOS setting, "Settings > Privacy > Photos or Microphone".

Request for review

Please send a review of your comments and requests for this app. We will use your review to improve our products. Thank you for your cooperation.


It will move to another site, download from Aplle Store Please send a review message for "Sound Lissajous Meter".


Please fill in your review by accessing from iOS device.

Contact us

Inquire about this app please from below!

Support contact : support_ap@toon-llc.com

Please contact us with the following details if you have any requests or problems.

1. Application name
2. Device model
3. iOS version
4. Country you live
5. Details about your requests or problems.

(note: Please enter the at sign of the mail address in lowercase letters.)

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