Auto Recorder starts and stops the record function when sound is detected.

Auto Recorder, starts and stops the record function when sound of a sufficient level is picked up by the microphone. This feature saves valuable recording time by not recording periods when there is little or no sound.

PRO:

- Smart Voice-activated Spy recording.

- Mic calibration recorder.

- Stopping recording automatically.

- Live audio spectrum analyzer.

- Unlimited recording time.

- Date-based naming.

- Background recording (You can open other app while recording, even when display is off).

- Built-in share memo (Bluetooth, Drive, Dropbox, Email, Gmail, WhatsApp, etc.).

- Audio files .wav (3GP, AMR, MP4) export over the USB.

- Supports any OS (Linux, Mac OS, Windows, etc.) to playback using VLC.

- Landscape and portrait display modes support for Tablet.

- Show free space.

- Can set WAVE format (3GP, AMR, MP4).

- Can use the rear microphone.

- Can increase microphone volume.

- Can delete older records if you are running out of storage space.

- Can set the sampling frequency (kHz).

In telecommunications, a voice operated switch, also known as VOX or Voice Operated eXchange, is a switch that operates when sound over a certain threshold is detected. It is usually used to turn on a transmitter or recorder when someone speaks and turn it off when they stop speaking. It is used instead of a push-to-talk button on transmitters or to save storage space on recording devices. On cell phones, it is used to save battery life. Intercom systems that use a speaker in a room as both a speaker and a microphone will often use VOX on the main console to switch the audio direction during a conversation. The circuit usually includes a delay between the sound stopping and switching direction, to avoid the circuit turning off during short pauses in speech (From Wikipedia).