Keep Black vs Audio Tone Generator Plus

Turns your TV display output to complete black so you can keep playing music or podcasts while your display shows nothing. FEATURES - Black screen to save your eyes and the environment from unnecessary visual clutter when you are listening to music or podcasts. - Prevents the screen saver from kicking in while the screen is turned to black. This is similar to a screen saver, but also prevents the default screen savers from kicking in. - Continue to listen to audio in the background with Apple Music, Spotify or Tidal. Works with any other that supports music or audio playback. - A blinking visual indicator that can be turned on as needed with a timer feature. - Move the application to the top shelf for an elegant black background for your Apple TV home screen. - Minimalistic user interface and settings HOW TO - You can also show a green blinking indication to identify that the application is still active. It can set to a time duration as well. Settings related to this feature can be changed by changing the settings at Settings > Apps > Keep Black. - To exit the app, simply press the menu or the home button on your Siri remote. - This app also prevents the Apple TV from sleeping while active, so please make sure you are turning it off when you are done watching. - Notification overlays will continue to show while in the application. To disable them, please goto Settings > Apps > TV, find the notifications section and disable notifications. WORKS GREAT - On OLED, LCD and QLED displays made by Samsung, LG, Sony, Philips, Vizio, Panasonic and also displays that support true blacks with HDR. - On Projectors made by Xiaomi, Epson and BenQ and others. - Other displays such as external monitors being used as the output device on Apple TV with HDMI.

"Audio Tone Generator Plus" is an 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. The frequency can be set using four presets or keyboard input. - Frequency Sweep Generator: It produces a linear sine wave frequency sweep/warble signal. The start and stop frequencies can be adjusted using three presets or keyboard input. Upward and downward sweeps are possible. - Frequency Chirp Generator: It produces a very short sweep signal with linear or exponential frequency change. The start and stop frequencies can be adjusted using three presets or keyboard input. The generation time of the chirp signal and the 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.