The term directional microphone is identified in base64 scheme by the sequence ZGlyZWN0aW9uYWwgbWljcm9waG9uZQ==, while the MD5 signature is equal to f618f7f13c35b6a9c6ac1a51a2c3784a. The ASCII encoding of directional microphone in hexadecimal notation is 646972656374696f6e616c206d6963726f70686f6e65.