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"Audio Tone Generator Plus" is a new integrated sound signal generator app that produces various audio reference tones. It can be used in a wide range of fields as a reference sound source for audio system testing, sound tuning, hearing testing, and more. This app features four types of signal generators for producing sine wave signals, frequency sweep signals, chirp signals, and colored noise with octave band filters. - Sine Wave Generator: Generates a pure tone with high DVD-quality precision and 0.1 Hz frequency accuracy. Frequency can be set by four presets or keyboard input. - Frequency Sweep Generator: It has linear sine wave frequency sweep/warble signal, and can set start and stop frequencies using three presets and keyboard input. Upward and downward sweeps are possible. - Frequency Chirp Generator: It is a short-time sweep signal with linear or exponential frequency change. Start and stop frequencies can be adjusted using three presets or keyboard input. The chirp signal generation time and start delay time can be adjusted. - Colored Noise Generator with Octave Band Filter: Generates white, pink, red, blue, purple, and gray noise. It can also generate 1/1 and 1/3 octave band colored noise with a user-configurable octave band filter. Multiple selections of arbitrary bands are possible and are used for the detailed analysis of specific frequency bands. A burst signal can be output with four different duty ratios. Features: - Sine wave generator (Sine): Sine wave signal (Preset frequencies: 200Hz, 1kHz, 2kHz, 8kHz) - Frequency Sweep generator (Sweep): Sine wave frequency sweep/warble signal (Preset frequencies: 20Hz - 20kHz, 200Hz - 2kHz, 2kHz - 8kHz, transition time: 30, 60, 120, 180sec), upward/downward sweep playback - Colored Noise generator with octave-band filter (Noise): White noise, Pink noise, Red noise (Brown noise), Blue noise, Purple noise and Gray noise. Octave-band noise generation by 1/1 or 1/3 octave-band filer (center frequency: 63Hz - 8kHz / 50Hz - 10kHz), burst playback with duty ratio of 10/25/50/75%. - Chirp signal generator (Chirp): Short-time sweep signal (transition time: 0.1 - 1.0sec, start delay time: 1 - 10sec, frequency variation curve: Linear/Exponential.) - Configurable frequency range: 20Hz - 21kHz - Frequency input by keyboard in units of 0.1Hz. - Preset frequency customization function. - Playback time control: 30sec/60sec/2min/3min/15min/60min - Output gain control. - Output channel selection: LR/L/R - Output phase control: 0/180 degree - In-phase/Out-of-phase. Applications: - Sound testing for loudspeakers and headphones. - Testing and tuning for Audio amplifiers, equalizers and many other Audio equipment. - Acoustics testing. - Frequency response measurement. - Sound insulation level measurement. - Indoor sound field distribution measurement. - Reverberation time measurement. - Sound masking. - Relaxation and meditation. - Hearing test. Note: - Please be careful that the high-frequency signals of high volume in continuous may damage the loudspeakers, even if your ears do not perceive it as being too loud. - The chirp signal is a sweep signal of extremely short duration, so it does not guarantee a playback frequency in the specified range. - If no frequency is selected in the octave-band noise generation, the signal output will be silent. - When using this application with wireless communication such as Bluetooth or AirPlay, there may be cases that limitation of the playback frequency, lowering the output level and irregular noise, etc., may occur under the influence of wireless environment, communication equipment and communication state. Please note that this is not to guarantee that this application operates as configured specifications under the wireless communication. Please visit our iOS app support page for more information on this app.