SHF receiver

• US 4,710,972 A
• Filed: 10/02/1986
• Issued: 12/01/1987
• Est. Priority Date: 10/21/1985
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hayashi, Toshihide, Yamakami, Osamu, Kanayama, Ikuo
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): KUNTZ, CURTIS A
• Application Number:
  US06/914,305
• Time in Patent Office: 425 Days
• Field of Search: 455/161, 455/166, 455/168, 455/180, 455/179, 455/3, 455/277, 455/4, 455/7
• US Class Current: 455/179.1
• CPC Class Codes: H01Q 21/245 provided with means for varying the polarisation polarising devices H01Q15/24; tracking by comparing linear polarisation compounds G01S3/146; reducing depolarisation effects H04B7/00; polarisation diversity H04B7/10
• CPC Class Codes: H04B 1/1009 Placing the antenna at a place where the noise level is low and using a noise-free transmission line between the antenna and the receivers screened aerials H01Q7/04; feeders for aerials H01Q9/00
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H

Abstract

A superhigh frequency (SHF) receiver for receiving satellite broadcast signals having different planes of polarization for adjacent or odd- and even-numbered channels, respectively, is operative, upon sequential channel selection, to sequentially select alternate or every other channel, for example, the odd-numbered channels, having a first plane of polarization, and then to automatically switch the receiving plane of polarization of a polarizer and sequentially select the other alternate channels, for example, the even-numbered channels, having a second plane of polarization. Thus, the user does not have to switch the plane of polarization of the polarizer for receiving the satellite broadcast signal and the plane of polarization of the polarizer needs to be changed only once when scanning the full array of channels so that channel selection can be carried out at higher speed.

Claims

1. An apparatus for receiving satellite broadcast signals broadcast in a number of channels occupying successively overlapping frequency bands with a first plane of polarization for first alternate channels and a second plane of polarization for second channels arranged between said first channels, said apparatus comprising:

antenna means for receiving said satellite broadcast signals;

polarizer means for receiving a satellite broadcast signal derived from said antenna means and providing a plane of polarization adapted to be switched for correspondence with the plane of polarization of the received satellite broadcast signal;

channel selecting means for sequentially selecting the channels of said satellite broadcast signals;

means for tuning to each channel selected by said channel selecting means; and

controlling means for automatically controlling the sequential selecting of the channels, the tuning of said tuning means and the switching of the plane of polarization of said polarizer means in accordance with a channel selected by said channel selecting means, said controlling means causing said channel selecting means to first select sequentially from among said first alternate channels having said first plane of polarization, and thereafter automatically switching the plane of polarization of said polarizer means and then causing channel selecting in sequence from among said second channels having said second plane of polarization.

2. An apparatus according to claim 1;

in which said first channels are odd-numbered channels and said second channels are even-numbered channels.

3. An apparatus according to claim 2;

in which said channel selecting means includes means for sequentially selecting said odd- and even-numbered channels in ascending order, and means for sequentially selecting said odd- and even-numbered channels in descending order.

4. An apparatus according to claim 1;

in which said satellite broadcast signals are in a plurality of bands; and

further comprising means for switching from one to another of said bands.

5. An apparatus according to claim 1;

in which the satellite broadcast signals include audio information selectively provided in a plurality of different modes employing a single carrier wave and two carrier waves, respectively, which are modulated with different deviations; and

further comprising means for selectively deriving audio information provided in a received satellite broadcast signal in any one of said modes.