Patent
RF converter employing an SAW filter
Reads0
Chats0
TLDR
In this paper, a high frequency side of the amplitude characteristic in the pass band of the surface acoustic wave filter is enhanced in comparison with a low frequency side thereof, which is the case in our case.Abstract:
An RF converter includes a video modulator and a sound modulator. A modulated video signal from the video modulator and a modulated sound signal from the video modulator are mixed and conducted to a surface acoustic wave (SAW) filter constituted as a band pass filter, an RF television signal being the output of this surface acoustic wave filter. A high frequency side of the amplitude characteristic in the pass band of the surface acoustic wave filter is enhanced in comparison with a low frequency side thereof.read more
Citations
More filters
Patent
Data transmission method and apparatus
TL;DR: In this paper, the authors proposed a method and apparatus for modulating a plurality of information signals onto respective unique intermediate frequency (IF) carrier signals, summing the respective IF carrier signals to provide a stacked IF carrier signal and upconverting the stacked IC carrier signal to a radio frequency (RF).
Patent
Low cost VBS encoder and RF modulator for supplying VSB baseband signal to RF input of digital television receiver
TL;DR: An encoder-modulator for coupling a digital baseband television signal to a VSB digital television receiver that includes filters, equalization circuitry, and forward error correction circuitry for correcting signal impairments that are below a given threshold was proposed in this paper.
Patent
RF converter having multiple AV/S terminals
TL;DR: In this article, the authors present an ANT input with an electronic switch and a detecting unit having a driver, which decides whether the electronic switch turns on or off if the detecting unit detects no AV-Signal or S-signal input from the AV/S terminals.
Patent
Rf modulator requiring no test pattern generator
Hiroyoshi C,Sawa C +1 more
TL;DR: In this paper, an A/D converter (25) and an oscillator control circuit (24) are used to control both the audio carrier and the RF carrier oscillation on the basis of the channel setting data.
Patent
Radio frequency (RF) modulator with narrow bandpass filter
Jong Gi Yongin Ryu,Duck Whan Suwon Kim,Dong Taek Suwon Moon,Dae Yoo Suwon Lee,Kyu-O Suwon Jeon +4 more
TL;DR: In this paper, an RF modulator with a narrow bandpass filter was proposed to remove or block unnecessary components such as lower side band and harmonic frequency signals generated after video and audio signals have been RF-modulated, such that it can prevent interference between channels from being generated.
References
More filters
Patent
Intercarrier signal detection circuit for a television receiver
TL;DR: In this article, an intercarrier signal detection circuit for a television receiver sound system comprises a SAW (Surface Acoustic Wave) filter coupled to the output of a tuner, the SAW filter having a response characteristic including two symmetrical lobes centered about 41.25 MHz and 45.75 MHz respectively.
Patent
Circuit for providing accurately spaced video and sound carriers
TL;DR: In this article, a phase detector is used to compare a different predetermined fraction of the outputs of the voltage-controlled oscillators in each of the phase-locked loops with the output frequency of the reference oscillator.
Patent
Crosstalk attenuator system
TL;DR: In this paper, a crosstalk attenuator is proposed to reduce the amount of the CRS at the time of separating and reproducing the original signals from the video disc recording medium on which a video signal and a voice signal have been recorded as a compound signal on the same track.
Patent
Apparatus for producing audio and visual signals for modulating a television system carrier signal
TL;DR: In this paper, a television signal generator for producing a composite RF signal without high level intermodulation products is presented, where a signal network is provided to linearly combine a first video modulated carrier signal and a second carrier frequency of the same frequency modulated with an audio modulated subcarrier.
Journal ArticleDOI
New Color TV Receiver With Composite SAW IF Filter Separating the Sound and Picture Signals
J. Yamada,M. Uematsu +1 more
TL;DR: In this article, a composite SAW-based TV IF filter for sound multiplexing broadcasting has been proposed, where the signal detections are individually performed by the interearrier signal in IF without any external signal.