Unlock instant, AI-driven research and patent intelligence for your innovation.

Sound intermediate frequency demodulator and sound intermediate frequency detection method thereof

A detection method and demodulator technology, which can be applied to TV, color TV parts, electrical components, etc., and can solve problems such as wrong setting of sound intermediate frequency demodulator

Inactive Publication Date: 2013-07-31
HIMAX MEDIA SOLUTIONS
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The environment of the source may change after the setting of the audio IF demodulator. Corresponding to the environment of the current source, the audio IF demodulator may provide wrong settings

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sound intermediate frequency demodulator and sound intermediate frequency detection method thereof
  • Sound intermediate frequency demodulator and sound intermediate frequency detection method thereof
  • Sound intermediate frequency demodulator and sound intermediate frequency detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The following description will describe the embodiments of the present invention in detail along with the illustrations of the embodiments. The same or similar reference numerals used in the drawings are used to describe the same or similar parts.

[0016] figure 1 It is a system block diagram of an analog TV sound intermediate frequency (sound-IF) demodulator according to an embodiment of the present invention. Please refer to figure 1 , in this embodiment, the audio IF demodulator 100 includes analog demodulators 110 and 120 and a NICAM system (near instantaneouscompanded audio complex, NICAM) digital demodulator 130 . In this embodiment, for the sake of cost, the analog demodulators 110 and 120 of the audio IF demodulator can use the simplest analog demodulator.

[0017] Specifically, the audio IF demodulator 100 is adapted to receive the audio signal SIF. Generally speaking, the sound signal SIF has a main carrier signal and a sub-carrier signal, wherein the mai...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a sound intermediate frequency demodulator with a first demodulation unit and a second demodulation unit and a sound intermediate frequency demodulation method thereof. A sound inverse matrix operation unit is suitable for performing inverse matrix operation on the output of the sound intermediate frequency demodulator to generate a driving signal. The first demodulation unit demodulates a first carrier signal to generate a first demodulation signal in the sound inverse matrix operation unit; a second demodulation unit detects quality of a sound signal and demodulatesa second carrier signal to generate a second carrier signal to generate a second demodulation signal in the sound inverse matrix operation unit and / or a first demodulation unit; and when being idle, the second demodulation unit is programmed to select the corresponding standards in a plurality of preset standards relevant to the sound signal according to the quality of the sound signal, so that the sound intermediate frequency demodulator is programmed to demodulate the sound signal according to the corresponding standards.

Description

technical field [0001] The invention relates to a demodulator and a signal detection method thereof, in particular to a sound intermediate frequency (sound-IF) demodulator and a sound-IF detection method thereof. Background technique [0002] Generally speaking, television systems in various countries specify the number of channels in the ultra high frequency (UHF) or very high frequency (VHF) frequency band, and one channel actually consists of two signals. One is an image signal, which transmits image information by performing amplitude modulation (AM) on a frequency. The other is an audio signal, which transmits audio information by frequency modulation (FM) on a frequency, where the frequency of the audio signal differs from the frequency of the image signal by a fixed displacement, and the fixed displacement is generally 4.5 , 5.5, 6 or 6.5MHz. [0003] In an analog TV application, a modulator selects a channel and shifts the signal frequency of the channel by a fixed...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/60
Inventor 卢世权蔡典儒林延铭
Owner HIMAX MEDIA SOLUTIONS