Abstract: A method is disclosed for generating a voice-activated responsive action, such as a pulse or a measurement, with improved speed and time resolution. First, an operator calls an arming command to prepare the application, and then calls a trigger command to initiate the responsive action. The responsive action is generated immediately upon detecting the leading edge of the trigger command, resulting in an extremely fast response with precise timing. The particular responsive action may be determined by the type of sound detected, or by other information contained in the trigger command, or by the arming command, or by another prior command. Other types of preparatory events are disclosed. Efficient methods for identifying commands are disclosed. For all applications requiring an extremely prompt, precisely timed, hands-free response to a voice command, this invention is enabling.

Abstract: A method is disclosed for discriminating voiced and unvoiced sounds in speech. The method detects characteristic waveform features of voiced and unvoiced sounds, by applying integral and differential functions to the digitized sound signal in the time domain. Laboratory tests demonstrate extremely high reliability in separating voiced and unvoiced sounds. The method is very fast and computationally efficient. The method enables voice activation in resource-limited and battery-limited devices, including mobile devices, wearable devices, and embedded controllers. The method also enables reliable command identification in applications that recognize only predetermined commands. The method is suitable as a pre-processor for natural language speech interpretation, improving recognition and responsiveness. The method enables realtime coding or compression of speech according to the sound type, improving transmission efficiency.

Abstract: When a voice-activated device or application is first started, the signal levels corresponding to spoken commands are initially unknown, making it difficult to set detection thresholds. The inventive method provides an initial command-detection threshold based on the noise level alone. The first command is detected using this initial threshold. Then the threshold is revised according to the first command sound, and a second command is detected using the revised threshold. After detecting each command, the detection threshold is further refined according to the current noise and command sounds. Methods are also disclosed for optimizing the thresholds, adjusting parameters according to sound, and detecting voiced and unvoiced sounds separately. These capabilities enable many emerging voice-activated products and applications.

Abstract: A voice-activated pulser can trigger an oscilloscope or a meter, upon a simple voice command, thereby enabling hands-free signal measurements. The pulser can also be used to control the circuit under test, activating it or changing parameters, all under voice control. The pulser includes numerous switch-selectable output modes that allow users to generate complex, tightly-controlled diagnostic sequences, all activated upon a voice command and hands-free. The invention includes a fast, robust command-interpretation protocol that completely eliminates the expense and complexity of word recognition. Visual indicators display the device status and various operating modes, and also confirm each output pulse. The device receives voice commands directly through an internal microphone, or through a detachable headset, and confirms each command with an acoustical signal in the headset.

Abstract: A method is disclosed for identifying a spoken command by detecting intervals of voiced and unvoiced sound, and then comparing the order of voiced and unvoiced sounds to a set of templates. Each template represents one of the predetermined acceptable commands of the application, and is associated with a predetermined action. When the order of voiced and unvoiced intervals in the spoken command matches the order in one of the templates, the associated action is thus selected. Silent intervals in the command may also be included for enhanced recognition. Efficient protocols are disclosed for discriminating voiced and unvoiced sounds, and for detecting the beginning and ending of each sound interval in the command, and for comparing the command sequence to the templates. In a sparse-command application, this method provides fast and robust recognition, and can be implemented with low-cost hardware and extremely minimal software.

Abstract: A voice-activated signal generator is a device to produce output signals responsive to spoken commands. The device accepts only predetermined commands and responsively generates specific output signals such as a pulse, a series of pulses, a voltage level, or a periodic waveform. The device is suitable for triggering an oscilloscope, or controlling a circuit under test, or activating another instrument. The invention also enables safely controlling a hazardous system such as a high voltage system, hands-free and with precise timing determined by the user. Also disclosed are fast, compact, robust algorithms for analyzing spoken commands, and particularly for detecting voiced and unvoiced sound, and for identifying commands by comparing the order of sound intervals in the spoken command to templates that represent the predetermined commands. The device may have one output or multiple outputs in parallel, all controlled by voice commands with precision output timing.

Abstract: A method is disclosed for controlling a voice-activated device by interpreting a spoken command as a series of voiced and non-voiced intervals. A responsive action is then performed according to the number of voiced intervals in the command. The method is well-suited to applications having a small number of specific voice-activated response functions. Applications using the inventive method offer numerous advantages over traditional speech recognition systems including speaker universality, language independence, no training or calibration needed, implementation with simple microcontrollers, and extremely low cost. For time-critical applications such as pulsers and measurement devices, where fast reaction is crucial to catch a transient event, the method provides near-instantaneous command response, yet versatile voice control.

Abstract: A voice-activated instrument performs a measurement and displays the measured value when commanded by voice. The system also resets under voice control. The measurement trigger is any single-syllable command such as “Count” or “Go”. The reset trigger is any two-syllable command such as “Reset”. Any type of momentary measurement device may be controlled in this way, including time interval measurements, event counting, length measuring, weighing, and electronic metering measurements, and many others.