Signal correction method and receiver

• US 20030027536A1
• Filed: 07/29/2002
• Published: 02/06/2003
• Est. Priority Date: 07/31/2001
• Status: Active Grant

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: Hanaoka, Hiromichi
• Granted Patent: US 7,079,821 B2
• Time in Patent Office: Days
• US Class Current: 455/230
• CPC Class Codes: B60R 25/04 operating on the propulsion system, e.g. engine or drive motor
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user

Abstract

A signal correction method and receiver receives an asynchronous wireless signal including a code signal, and determines whether the code signal is discriminated as a regular code. When the determined code signal is not discriminated as the regular code, the signal correction method and receiver changes a sampling time for the asynchronous wireless signal within a predetermined range on sampling. When the code signal is still not discriminated as the regular code after changing the sampling time, the signal correction method and receiver changes a tuning frequency of a local oscillation signal.

Claims

1. A signal correction method, comprising the steps of:

(a) receiving an asynchronous wireless signal including a code signal;

(b) determining whether the code signal is discriminated as a regular code; and

(c) changing a sampling time for the asynchronous wireless signal within a predetermined range on sampling when the code signal is not discriminated as the regular code in the step (b).

2. The correction method as set forth in claim 1, further comprising the steps of:

(d) determining whether the code signal is discriminated as the regular code after the step (c) is performed; and

(e) changing a tuning frequency of a local oscillation signal when the code signal is still not discriminated as the regular code in the step (d).

3. A signal correction method, comprising the steps of:

(a) receiving an asynchronous wireless signal including a code signal;

(b) determining whether the code signal is discriminated as a regular code; and

(c) changing a tuning frequency of a local oscillation signal when the code signal is not discriminated as the regular code in the step (b).

4. The signal correction method as set forth in claim 3, further comprising the steps of:

(d) determining whether the code signal is discriminated as the regular code after the step (c) is performed; and

(e) changing a sampling time for the asynchronous wireless signal within a predetermined range on sampling when the code signal is still not discriminated as the regular code in the step (d).

5. An receiver, comprising:

a front-end circuit, which received an asynchronous wireless signal, and converts the asynchronous wireless signal into an intermediate frequency signal by multiplying the asynchronous wireless signal with a local oscillation signal;

a code signal reader, which reads a code signal from the intermediate frequency signal output from the front-end circuit; and

a controller, determining whether the code signal is discriminated as a regular code, and changing a sampling time for the asynchronous wireless signal within a predetermined range on the front-end circuit when the code signal is not discriminated as the regular code.

6. The receiver as set forth in claim 5, wherein the controller changes a tuning frequency of the local oscillation signal on the front-end circuit when the code signal corrected by changing of the sampling time is still not discriminated as the regular code.

7. An receiver, comprising:

a front-end circuit, which receives an asynchronous wireless signal, and converts the asynchronous wireless signal into an intermediate frequency signal by multiplying the asynchronous wireless signal with a local oscillation signal;

a code signal reader, which reads a code signal from the intermediate frequency signal output from the front-end circuit; and

a controller, determining whether the code signal is discriminated as a regular code, and changing a tuning frequency of the local oscillation signal on the front-end circuit when the code signal is not discriminated as the regular code.

8. The receiver as set forth in claim 7, wherein the controller changes a sampling time for the asynchronous wireless signal within a predetermined range on the front-end circuit when the code signal corrected by changing of the tuning frequency of the local oscillation signal is still not discriminated as the regular code.