# US 2017/0285774 A1 · Characterization and simulation of writing instruments > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0285774 A1 - Document ID: US20170285774A1 - Status: Published application - Kind: A1 - Application number: 15/089,290 - Filed: 2016-04-01 - Published: 2017-10-05 - Earliest claimed: 2016-04-01 - Inventors: Kunjal Parikh; Thomas Agung Nugraha; Arvind Kumar; Akihiro Takagi; John F. Jacobs - Web page: https://patentgrep.com/patent/US20170285774A1 ## CPC - G06F 3/03545: {Pens or stylus} - G06F 3/167: {Audio in a user interface, e.g. using voice commands for navigating, audio feedback} - G06F 3/016: {Input arrangements with force or tactile feedback as computer generated output to the user} - G06F 3/0383: {Signal control means within the pointing device} - G06F 3/16: Sound input; Sound output (speech processing G10L) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract An active stylus enables an electronic device to provide a user-friendly user input. The active stylus uses various sensors and feedback mechanisms to characterize or simulate the audible and haptic feedback associated with various writing instruments. The sensors capture pressure, speed, vibration, sound, and other characteristics of using a specific writing instrument on a given surface. This enables the active stylus to simulate the writing instrument accurately while avoiding increased haze and optical distortions due to etching or engineered film. ## Claims ### Claim 1 A writing instrument characterization apparatus comprising: an audio input device to receive an audio input associated with a writing instrument while in use; a haptic input device to receive a haptic input associated with the writing instrument while in use; and a processor configured to generate an adaptive feedback model based on the audio input and haptic input. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the adaptive feedback model includes an audio waveform associated with the writing instrument. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the audio waveform is generated by applying an audio frequency analysis to the audio input to identify the audio waveform within a selected audio frequency range. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the adaptive feedback model includes a haptic waveform associated with the writing instrument. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the haptic waveform is generated by applying a haptic frequency analysis to the haptic input to identify the haptic waveform within a selected haptic frequency range. ### Claim 6 (depends on 1) The apparatus of claim 1, further including a communication device to receive an adaptive feedback model update from a host, wherein the processor is further configured to update the adaptive feedback model based on the adaptive feedback model update. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the communication device includes a network communication device to connect to the host and receive the adaptive feedback model update. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the audio input device includes a stylus microphone. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein receiving the haptic input device includes a stylus haptic sensor. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the stylus haptic sensor includes at least one of an accelerometer, a gyroscope, a pressure sensor, a variable reluctance sensor, and an inductive coil sensor. ### Claim 11 (depends on 1) The apparatus of claim 1, further including a stylus motion input device to receive a stylus motion input. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the processor is further configured to update the adaptive feedback model based on the stylus motion input. ### Claim 13 A writing instrument characterization method comprising: receiving an audio input associated with a writing instrument while in use; receiving a haptic input associated with the writing instrument while in use; and generating an adaptive feedback model based on the audio input and haptic input. ### Claim 14 (depends on 13) The method of claim 13, wherein the adaptive feedback model includes an audio waveform associated with the writing instrument. ### Claim 15 (depends on 14) The method of claim 14, wherein generating the adaptive feedback model includes applying an audio frequency analysis to the audio input to identify the audio waveform within a selected audio frequency range. ### Claim 16 (depends on 13) The method of claim 13, wherein the adaptive feedback model includes a haptic waveform associated with the writing instrument. ### Claim 17 (depends on 16) The method of claim 16, wherein generating the adaptive feedback model includes applying a haptic frequency analysis to the haptic input to identify the haptic waveform within a selected haptic frequency range. ### Claim 18 (depends on 13) The method of claim 13, further including: receiving an adaptive feedback model update from a host; and updating the adaptive feedback model based on the adaptive feedback model update. ### Claim 19 At least one machine-readable storage medium, comprising a plurality of instructions that, responsive to being executed with processor circuitry of a computer-controlled device, cause the computer-controlled device to: receive an audio input associated with a writing instrument while in use; receive a haptic input associated with the writing instrument while in use; and generate an adaptive feedback model based on the audio input and haptic input. ### Claim 20 (depends on 19) The machine-readable storage medium of claim 19, wherein the adaptive feedback model includes an audio waveform associated with the writing instrument. ### Claim 21 (depends on 20) The machine-readable storage medium of claim 20, the instructions further causing the computer-controlled device to apply an audio frequency analysis to the audio input to identify the audio waveform within a selected audio frequency range. ### Claim 22 (depends on 19) The machine-readable storage medium of claim 19, wherein the adaptive feedback model includes a haptic waveform associated with the writing instrument. ### Claim 23 (depends on 22) The machine-readable storage medium of claim 22, the instructions further causing the computer-controlled device to apply a haptic frequency analysis to the haptic input to identify the haptic waveform within a selected haptic frequency range.