Rather than representing the full waveform, or shape, of sound information in the way that most conventional, full-spectrum audio recordings in any application do, zero-crossing is a compact way of representing only the most prominent frequency in a recording by noting the points in time at which a sound wave has crossed a reference amplitude a certain number of times.

Because the zero-crossing format is only able to represent one frequency at a time, full-spectrum is particularly preferable for recording multiple sources of sound simultaneously, such as multiple bats vocalizing in the same area, or a single bat in a noisy environment.

• What is the lowest frequency the Song Meter Mini Bat's ultrasonic microphone can record?
• What is the lowest frequency the Song Meter SM4BAT FS can record?
• Why can't I use an adapter to connect a USB-C Echo Meter Touch to my Lightning iOS device?
• Can I use Echo Meter Touch modules with USB connectors with iOS devices?
• What iOS devices are compatible with my Echo Meter Touch module?
• What type of data port does my phone or tablet have?
• What type of plug does my Echo Meter Touch module have?
• What adapter do I need for my Echo Meter Touch module and Android or iOS device?
• How do I update the firmware on my Echo Meter Touch module with USB to add iOS compatibility?
• Are there acoustic differences between the first- and second-generation Mini Bat recorders?
• Will the Lithium-ion lids I used with first-generation Minis fit the new models?
• Will the security bracket accessory I use with first-generation Minis be compatible with the new models?
• View more questions