Self-tuning transmitter

• US 8,218,608 B2
• Filed: 08/14/2002
• Issued: 07/10/2012
• Est. Priority Date: 09/05/2001
• Status: Active Grant

• Current Assignee: Lear Corporation
• Original Assignee: Lear Corporation
• Inventors: Nantz, John S., Tang, Qingfeng, Ghabra, Riad, King, Ronald O., Conner, Bruce, Turovsky, Art, Walker, Keith, Bejster, Thomas
• Primary Examiner(s): Ahn, Sam K
• Assistant Examiner(s): Malek, Leila
• Application Number:
  US10/218,975
• Publication Number:
  US 20030053529A1
• Time in Patent Office: 3,618 Days
• Field of Search: 375/219, 375/326, 375/327, 375/344, 375/319, 375/295, 375/316, 340/825.69, 340/5.71, 455/164.2, 455/182.2, 455/182.3, 455/192.2, 455/92
• US Class Current: 375/219
• CPC Class Codes: H03J 1/0008 using a central processing unit, e.g. a microprocessor digital tuning in general H03J5/0245
• CPC Class Codes: H03J 1/0025 in a remote control unit remote control tuning in general H03J9/00
• CPC Class Codes: H04L 25/20 Repeater circuits; Relay circuits
• CPC Class Codes: H04L 27/1563 using transition or level detection
• CPC Class Codes: H04N 5/38 Transmitter circuitry for the transmission of television signals according to analogue transmission standards H04N5/14 takes precedence

Abstract

A self-tuning duplicating transceiver is provided. The transceiver includes a microprocessor, a transmitter and a receiver. The transmitter includes an electrically tunable radio frequency oscillator, and the receiver includes a counter for determining an edge count associated with a received signal. The microprocessor is programmed to receive an unknown signal with the receiver and use the counter to determine the edge count thereof, and electrically tune the transmitter oscillator to a carrier frequency corresponding to the edge count for the unknown signal.

Claims

1. A self-tuning duplicating transceiver comprising:

a microprocessor;

a transmitter directly connected to the microprocessor and including a radio frequency oscillator capable of being electrically tuned to a carrier frequency within a range of frequencies, the transmitter further including a transmitter antenna; and

a receiver directly connected to the microprocessor and including a counter for determining an edge count associated with a received signal and indicative of a received signal carrier frequency, the receiver further including a receiver antenna separate from the transmitter antenna, wherein the receiver is not directly connected to the transmitter;

a prescaler that divides the received signal prior to introduction of the received signal to the counter,

wherein the microprocessor is programmed to, on demand by a user, receive an unknown signal with the receiver and use the counter to determine the edge count thereof, store the edge count for the unknown signal, and electrically tune the transmitter oscillator to a carrier frequency corresponding to the edge count for the unknown signal; and

wherein the microprocessor is further programmed to further electrically tune the transmitter oscillator by periodically repeating the following;

transmitting a new signal at the carrier frequency corresponding to the edge count for the unknown signal, receiving the new signal and using the counter to determine the edge count thereof, further electrically tuning the transmitter oscillator to match the new signal edge count to the unknown signal edge count, and storing a tuning setting for the transmitter.

2. The transceiver of claim 1 further comprising:

a demodulator at the receiver that demodulates the received signal and provides data to the microprocessor; and

a modulator at the oscillator that modulates data from the microprocessor onto the transmitted signal.

3. The transceiver of claim 2 wherein the microprocessor is further programmed to use the demodulator to learn the data in the unknown signal, and use the modulator to modulate the learned data onto transmitted signals.