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Alternate timing signal for a vestigial sideband modulator

A vestigial sideband, modulated signal technology, used in the field of timing and synchronization functions, which can solve the problems of oscillator cost and complexity of the total cost of the device.

Inactive Publication Date: 2005-03-09
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost and complexity of such an oscillator has a large impact on the total cost of the entire device

Method used

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  • Alternate timing signal for a vestigial sideband modulator
  • Alternate timing signal for a vestigial sideband modulator
  • Alternate timing signal for a vestigial sideband modulator

Examples

Experimental program
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Embodiment Construction

[0012] FIG. 1 is a block diagram of a reference signal generating device 10 that can provide a timing signal thereby eliminating the need for a highly stable reference oscillator that will build similar signals. The device 10 includes an RF signal input path 15 which is suitable for receiving a broadcast VSB signal 5 via an antenna 12. The device 10 is configurable, and in the specific embodiment described herein, the device 10 is used as a consumer electronic device 20 such as a VCR, a satellite broadcast receiver, a computer, a DVD player, or an on-screen display (OSD) unit. Subsystem, which is usually located on top of or near the digital television receiver 25.

[0013] The broadcast VSB signal 5 is coupled to a VSB receiver 30, which includes a variable frequency oscillator (VFO) 32 and a demodulator 31. Specifically, the VSB signal 5 includes a clock signal 15 of 10.76 MHz (or its second harmonic of 21.52 MHz), which is accurate to within 1 / 100,000 (for a 10.76 MHz signal) a...

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PUM

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Abstract

A remodulator timing signal (35) is generated by a phase locked loop (33) which is coupled to a broadcast vestigial sideband signal (5). Within the signal (5) is highly accurate timing data which is coupled to a demodulator (31). Timing signals to the demodulator are provided by a variable frequency oscillator (32) which receives a correction signal from a phase locked loop (33) housed within the demodulator. The phase locked loop generates the correction signal by comparing the VFO output frequency (36) with the timing data embedded within the broadcast signal (5). A value register (203,303,403) maintains the recent average VFO frequency. A multiplexer (204,304,404) selects the value register data to control the VFO (32,220,320) in the absence of the broadcast timing data.

Description

Technical field [0001] The present invention relates to a timing and synchronization function of a remodulator. Background technique [0002] The Advanced Television Systems Committee (ATSC) of the "Digital HDTV Alliance" formed by American television suppliers defines the high-definition television (HDTV) broadcasting standard. The ATSC A / 53 digital television standard states that equipment used to transmit HDTV signals requires a timing accuracy of 10 ppm. Therefore, consumer electronic devices such as digital video disc (DVD) players that will be used in conjunction with digital television receivers require similar precision clocks or time base signals, which are usually provided by an internal independent reference oscillator. The cost and complexity of such an oscillator has a great impact on the total cost of the entire device. [0003] The multi-valued symbol vestigial sideband (VSB) according to the ATSC standard is a well-known modulation method for digitally transmittin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03C1/60H04B1/68H04L7/00H04L7/033H04L27/06H04N5/44H04N21/426
CPCH04N21/426H04N5/4401H04B1/68H03C1/52H04L7/00H04L7/033H04L27/00
Inventor 保罗·G·克努森
Owner THOMSON LICENSING SA