The term sound pressure level is identified in base64 scheme by the sequence c291bmQgcHJlc3N1cmUgbGV2ZWw=, while the MD5 signature is equal to ac86f1971e62ea008f44145b2f99698c. The ASCII encoding of sound pressure level in hexadecimal notation is 736f756e64207072657373757265206c6576656c.