Methods and systems for transmission of arbitrary data via Bluetooth HFP audio connections with low latency

A wireless-communication device comprising:

• a user interface that is configured to receive outbound audio signals;
• a cryptographic module that is configured to encrypt the outbound audio signals into an outbound binary data sequence;
• a generator module that is configured to:
• receive an outbound-data bit pattern that is representative of the outbound binary data sequence;
• and
• generate an outbound byte sequence that is representative of the outbound-data bit pattern at least in part by, for each outbound data bit in the outbound-data bit pattern, generating an outbound byte:
• that is greater in value than the preceding outbound byte when the current outbound data bit is of a first value;
• and
• that is lesser in value than the preceding outbound byte when the current outbound data bit is of a second value;
• an audio codec that is configured to generate outbound transmission bits at least in part by, for each outbound byte received from the generator module, generating an outbound transmission bit:
• having the first value when the current outbound byte is greater in value than the preceding outbound byte;
• and
• having the second value when the current outbound byte is lesser in value than the preceding outbound byte;
• and
• a wireless-communication transceiver that is configured to convey the generated outbound transmission bits over a wireless link to a receiver.