Wireless transmitter and related multimedia system

• US 8,442,438 B2
• Filed: 06/30/2010
• Issued: 05/14/2013
• Est. Priority Date: 08/03/2009
• Status: Active Grant

• Current Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Original Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Inventors: Hsu, Cheng-Hsiung, Hsu, Chung-Wei, Wen, Cheng-Yen, Kuo, Chun-Chia
• Primary Examiner(s): Milord, Marceau
• Application Number:
  US12/828,233
• Publication Number:
  US 20110026634A1
• Time in Patent Office: 1,049 Days
• Field of Search: 455/42, 455/3.02, 455/3.06, 455/414.4, 455/114.2, 455/114.3, 455/118, 455/127.1, 455/131, 455/142, 455/205, 381/311, 244/158.5, 342/352, 342/357.2
• US Class Current: 455/42
• CPC Class Codes: H04B 1/3822 specially adapted for use in vehicles H04B1/3827 takes precedence
• CPC Class Codes: H04L 27/10 Frequency-modulated carrier systems, i.e. using frequency-shift keying H04L27/32 takes precedence

Abstract

A wireless transmitter includes a first filtering unit coupled to a first cable for outputting a first DC source transmitted on the first cable, a first power converting unit for converting the first DC source into a second DC source, a second filtering unit for eliminating noise in the second DC source, a first DC blocking unit for blocking the second DC source and outputting a second frequency modulation (FM) signal, an amplifier for amplifying the second FM signal to generate a first FM signal, and a second DC blocking unit coupled to the amplifier and the first cable, for outputting the first FM signal to the first cable, such that the first FM signal is transmitted to the air through the first cable as a transmitting antenna.

Claims

1. A wireless transmitter comprising:

a first filtering unit coupled to a first cable, for filtering out a first frequency modulation (FM) signal transmitted on the first cable, and outputting a first direct current (DC) source transmitted on the first cable;

a first power converting unit coupled to the first filtering unit, for converting the first DC source into a second DC source;

a second filtering unit coupled to the first power converting unit, for eliminating noise in the second DC source;

a first DC blocking unit for blocking the second DC source and outputting a second FM signal;

an amplifier coupled to the first DC blocking unit, for amplifying the second FM signal to generate the first FM signal; and

a second DC blocking unit coupled to the amplifier and the first cable, for blocking the first DC source transmitted on the first cable from the amplifier, and outputting the first FM signal to the first cable, to transmit the first FM signal to the air.

2. The wireless transmitter of claim 1, wherein the first cable is further coupled to a power supply, for transmitting the first DC source generated by the power supply to the first filtering unit.

3. The wireless transmitter of claim 1, wherein the second filtering unit is further coupled to a second cable for transmitting the second DC source.

4. The wireless transmitter of claim 1, wherein the second FM signal is generated by a satellite radio signal converted by a satellite radio receiver.

5. The wireless transmitter of claim 1, wherein the first DC blocking unit is further coupled to a second cable for transmitting the second FM signal to the first DC blocking unit.

6. The wireless transmitter of claim 1 further comprising a second power converting unit coupled between the first power converting unit and the amplifier, for generating power required by the amplifier.

7. The wireless transmitter of claim 1 further comprising an FM transmission circuit coupled to the first DC blocking unit, for generating a third FM signal.

8. The wireless transmitter of claim 1 further comprising an FM transmission circuit coupled to the first cable, for generating a third FM signal transmitted to the air through the first cable.

9. The wireless transmitter of claim 1, wherein the first FM signal and the second FM signal are satellites radio signals in an FM form.

10. A multimedia system comprising:

a frequency modulation (FM) receiving antenna for receiving a first FM signal;

an FM demodulator coupled to the FM receiving antenna, for demodulating the first FM signal to generate a baseband audio signal;

a speaker coupled to the FM demodulator, for playing the baseband audio signal;

a first cable coupled to a power supply, for transmitting the first FM signal and a first DC source generated by the power supply;

a second cable for transmitting a second FM signal and a second DC source;

a satellite radio receiver coupled to the second cable, for converting a satellite radio signal into the second FM signal; and

a wireless transmitter coupled to the first cable and the second cable, for converting the first DC source into the second DC source, and amplifying the second FM signal to generate the first FM signal, wherein the first FM signal is transmitted to the FM receiving antenna through the first cable.

11. The multimedia system of claim 10, wherein the wireless transmitter comprising:

a first filtering unit coupled to the first cable, for filtering out the first FM signal, and outputting the first DC source;

a first power converting unit coupled to the first filtering unit, for converting the first DC source into the second DC source;

a second filtering unit coupled to the first power converting unit and the second cable, for eliminating noise in the second DC source;

a first DC blocking unit coupled to the second cable, for blocking the second DC source and outputting the second FM signal;

an amplifier coupled to the first DC blocking unit, for amplifying the second FM signal to generate the first FM signal; and

a second DC blocking unit coupled to the amplifier and the first cable, for blocking the first DC source transmitted on the first cable from the amplifier, and outputting the first FM signal to the first cable.

12. The multimedia system of claim 11 further comprising a second power converting unit coupled between the first power converting unit and the amplifier, for generating power required by the amplifier.

13. The multimedia system of claim 11 further comprising an FM transmission circuit coupled to the first DC blocking unit, for generating a third FM signal.

14. The multimedia system of claim 11 further comprising an FM transmission circuit coupled to the first cable, for generating a third FM signal transmitted to the air through the first cable.

15. The multimedia system of claim 11, wherein the first FM signal and the second FM signal are satellites radio signals in an FM form.

16. The multimedia system of claim 10, wherein the first cable is a DC cable, and the second cable is a coaxial cable.

17. The multimedia system of claim 10, wherein the second DC source is power required by the satellite radio receiver.