Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1998-10-21
2000-10-10
Faile, Andrew I.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
709217, 348 12, 348 13, 348731, 455 51, 4551891, 4551911, 4551923, 375216, H04B 110, H04H 100, H04N 710, H04N 714, H04N 550
Patent
active
061310239
ABSTRACT:
A cable modem tuner includes, in the same casing, an up-stream circuit to transmit an up-stream data signal to a CATV station, and a reception circuit for receiving a down-stream signal via a HPF that removes the up-stream data signal. The reception circuit includes a select circuit that selects a signal of a desired frequency band out of one of three frequency bands, a signal processing block including three local oscillation circuits to convert a signal of a desired frequency band into an intermediate frequency signal of a desired channel using an oscillation signal of a corresponding oscillation circuit, and a down converter with a local oscillation circuit converting an applied signal into a signal for demodulating a received signal. The down converter provides a baseband signal used to demodulate a received signal by the QAM when a digital signal modulated by the QAM is received. Therefore, the cable modem tuner includes an analog received signal processing circuit and a digital received signal processing circuit in the same casing, and has a structure particularly suitable to a set top box.
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H. Hohmann et al.: "ICS For Television and Video-Recorder Tuners: TUA 2017 and SDA 3302" Siemens Components, vol. 25, No. 2, May 1990, pp. 65-69.
S.M. Liew et al.: "Single Wide Band VCO for Rx and TX"--Motorola Technical Developments, vol. 10, Mar. 1990, p. 122.
Nico Baars: "ICs and Discrete Semiconductors for TV and VCR Tuners" Electronic Components and Applications., vol. 9, No. 4, 1989, Eindhoven NL, pp. 240-252.
Faile Andrew I.
Huang Sam
Sharp Kabushiki Kaisha
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