# US 2021/0241608 A1 · Method carried out in system including active stylus and sensor controller, sensor controller, and active stylus

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- Number: US 2021/0241608 A1
- Document ID: US20210241608A1
- Status: Published application
- Kind: A1
- Application number: 17/234,604
- Filed: 2021-04-19
- Published: 2021-08-05
- Earliest claimed: 2017-02-22
- Assignees: Wacom Co., Ltd.
- Applicants: Wacom Co., Ltd.
- Inventors: Sadao Yamamoto; Hideyuki Hara
- Web page: https://patentgrep.com/patent/US20210241608A1

## CPC

- G08C 17/02: using a radio link
- G06F 3/03545: {Pens or stylus}
- G06F 3/04162: {for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware}
- G06F 3/0441: {using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals}
- G06F 3/0442: {using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser}
- H04B 1/7073: Synchronisation aspects
- G08C 2201/32: Remote control based on movements, attitude of remote control device
- H04B 2001/6912: {using chirp}
- G08C: TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmitting systems F15B; mechanical means for transferring the output of a sensing member into a different variable G01D5/00; mechanical control systems G05G)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04B: TRANSMISSION

## Abstract

A sensor controller includes a transmitter configured to transmit an uplink signal including a first partial signal and a second partial signal. The transmitter is configured to transmit the first partial signal by direct spreading using a first spread code and transmit the second partial signal by direct spreading using a second spread code which is different from the first spread code and which has an identical chip time length to the first spread code. An active stylus includes a receiver configured to receive an uplink signal including a first partial signal and a second partial signal. The receiver is configured to synchronize with the uplink signal by detecting the first partial signal using a first spread code and thereafter detect the second partial signal using a second spread code, which is different from the first spread code and has an identical chip time length to the first spread code.

## Claims

### Claim 1

A sensor controller comprising:
a transmitter configured to transmit an uplink signal including a first partial signal and a second partial signal;
wherein the transmitter is configured to transmit the first partial signal by direct spreading using a first spread code and transmit the second partial signal by direct spreading using a second spread code which is different from the first spread code and which has an identical chip time length to the first spread code.

### Claim 2 (depends on 1)

The sensor controller according to claim 1, wherein:
the second spread code has a code length that is shorter than a code length of the first spread code.

### Claim 3 (depends on 2)

The sensor controller according to claim 2, wherein:
the first spread code includes a plurality of the second spread codes.

### Claim 4 (depends on 1)

The system according claim 1, wherein:
the first partial signal includes information designating the second spread code; and
the uplink signal is received by acquiring a value of the information from the first partial signal detected using the first spread code, and based on the acquired value switching to use the second spread code to detect the second partial signal.

### Claim 5 (depends on 1)

The sensor controller according to claim 1, wherein:
the second spread code used to detect the second partial signal is switched depending on a present operation mode of an active stylus configured to receive the uplink signal.

### Claim 6

An active stylus comprising:
a receiver configured to receive an uplink signal including a first partial signal and a second partial signal;
wherein the receiver is configured to synchronize with the uplink signal by detecting the first partial signal using a first spread code and thereafter detect the second partial signal using a second spread code, which is different from the first spread code and which has an identical chip time length to the first spread code.

### Claim 7 (depends on 6)

The active stylus according to claim 6, wherein:
the second spread code has a code length that is shorter than a code length of the first spread code.

### Claim 8 (depends on 7)

The active stylus according to claim 7, wherein:
the first spread code includes a plurality of the second spread codes.

### Claim 9 (depends on 6)

The active stylus according claim 6, wherein:
the first partial signal includes information designating the second spread code; and
the receiver receives the uplink signal by acquiring a value of the information from the first partial signal detected using the first spread code, and based on the acquired value switching to use the second spread code to detect the second partial signal.

### Claim 10 (depends on 6)

The active stylus according to claim 6, wherein:
the receiver switches the second spread code used to detect the second partial signal depending on a present operation mode of the active stylus.