Multichannel-type radio frequency modulation circuit

• US 20010021997A1
• Filed: 12/05/2000
• Published: 09/13/2001
• Est. Priority Date: 03/07/2000
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lee, Jong Jin
• Application Number:
  US09/729,252
• Publication Number:
  US 20010021997A1
• Time in Patent Office: Days
• US Class Current: 725/74
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 5/40 Modulation circuits
• CPC Class Codes: H04N 7/102 Circuits therefor, e.g. noise reducers, equalisers, amplifiers H04N7/108 takes precedence
• CPC Class Codes: H04N 7/106 for domestic distribution

Abstract

A multichannel-type radio frequency modulation circuit for a set-top box, comprising a switch turned on/off in response to a switching voltage for passing/blocking a radio frequency signal from a radio frequency input terminal to a radio frequency output terminal, a modulation part enabled in response to operating voltages for modulating input audio signals and video signals into television signals at a plurality of channels, respectively, and a mixer for mixing the television signals modulated by the modulation part respectively with the radio frequency signal passed by the switch and outputting the resulting signals respectively to connected televisions via the radio frequency output terminal. The multichannel-type radio frequency modulation circuit is configured in a multichannel modulation manner in the set-top box such that a plurality of televisions receive broadcasting signals at different channels via the radio frequency modulation circuit.

Claims

1. A multichannel-type radio frequency modulation circuit for a set-top box, comprising:

a switch turned on/off in response to a switching voltage for passing/blocking a radio frequency signal from a radio frequency input terminal to a radio frequency output terminal;

modulation means enabled in response to operating voltages for modulating input audio signals and video signals into television signals at a plurality of channels, respectively; and

a mixer for mixing the television signals modulated by said modulation means respectively with the radio frequency signal passed by said switch and outputting the resulting signals respectively to connected televisions via said radio frequency output terminal.

2. The multichannel-type radio frequency modulation circuit as set forth in

claim 1

, wherein said modulation means includes a plurality of modulators, each of said modulators being enabled in response to a corresponding one of said operating voltages to modulate a corresponding one of said input audio signals and a corresponding one of said input video signals into a corresponding one of said television signals at said plurality of channels, said plurality of channels being set to be independent of one another.