Circuit and methods to use an audio interface to program a device within an audio stream

摘要

Method and apparatus for controlling a digitized analog audio device from a control circuit communicating with the digitized analog audio device with a serial digital analog audio protocol on a serial communication medium multiplexes command data words within digitized analog audio data frames. The digitized analog audio device extracts the command data words from the digitized analog audio data frames. The command data word includes a keyword packet, a command packet, an optional address packet, and an optional data packet. The keyword packet, a command packet, an optional address packet, and an optional data packet are each inserted into a separate number of truncated digitized analog audio data frames for iterative and successive transmission. The iterative transmission of the packets of the command word decreases the likelihood that digitized analog audio frames would contain packets of the command word.

主权项

1. A method for controlling at least one digitized analog communication device from a control circuit communicating with the at least one digitized analog communication device with a serial digitized analog protocol over a network of a plurality of digitized analog communication devices, the method comprising the steps of:
periodically sampling and digitizing an analog signal by one digitized analog communication device; placing the digitized analog signal into periodic frames by the one digitized analog communication device; serializing each frame of the digitized analog signal by the one digitized analog communication device; truncating at least one of each frame of the digitized analog signal at a least significant bit location of the at least one frame of the digitized analog signal to create a sub-channel within the at least one frame of the digitized analog signal by the one digitized analog communication device; multiplexing a command word received from the control circuit within the sub-channel of at least one of the periodic frames, wherein the command word comprises at least one keyword packet of a plurality of keyword packets followed by at least one command packet of a plurality of command packets; transmitting the truncated serial digitized signal with the command word multiplexed within the sub-channels of the frames over the network; and executing a command designated by the command word by at least one other digitized analog device iteratively receiving, extracting, and counting the command word based upon two or more receptions of the sub-channels of the frames.