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Steerable antenna and receiver interface for terrestrial broadcast
| Details |
Inventors: Henderson, John G. N.; Scarpa, Carl;
Assignee: Hitachi America, LTD. (Tarrytown, NY); Hitachi Home Electronics (America), Inc. (San Diego, CA)
Primary Examiner: Phan; Dao
Assistant Examiner:
Attorney, Agent or Firm: Straub & Pokotylo, Straub; Michael P.
Antennas with steerable antenna patterns and techniques for using such antennas are described. In accordance with the invention, antenna patterns with one or more NULLs are used. Through the use of digital control signals the antenna pattern is steered so that a source of signal interference, e.g., a multipath signal, will be located in a NULL. In this manner the received signal's S/N ratio can be maximized thereby facilitating demodulation. The techniques of the invention can be applied to television, computer devices, mobile devices and a wide range of other systems. Digital commands to control an antenna may include multiple information fields, e.g., a direction field, a channel field, a gain field and a polarity field. Antennas incapable of supporting the specified fields disregard information in fields which are not supported. Information in each supported field is decoded and used to adjust the corresponding antenna characteristic. |
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DETAILED DESCRIPTION The present invention is directed to methods and apparatus for implementing and controlling steerable antennas.
Various embodiments of the invention are directed to antennas suitable for indoor use.
Such antennas may be, e.
g.
, incorporated into television receivers, e.
g.
, to facilitate the reception of DTV signals.
To reduce the effects of multipath interference, in various embodiments antenna patterns with one or more nulls are used.
Aligning a null with a source of signal interference, e.
g.
, a strong multi-path signal, the signal to noise ratio is improved resulting in an increased ability to demodulate and decode a received signal.
While the antenna control techniques of the present invention can be used with mechanically steerable antennas, to reduce the number of mechanical parts and to facilitate rapid redirection of the antenna pattern through the use of digital control signals, many embodiments of the invention are directed to antennas with electrically steerable reception patterns.
In accordance with various embodiments of the invention, the antenna pattern, e.
g.
, it orientation, is directed by control circuits within a receiving device such as, for example, a demodulator and associated circuits, or by a similar device located in or coupled to the antenna.
In accordance with the invention, the circuitry used to control the steerable antenna communicates with the antenna via digital signals transmitted over a digital bus.
The digital bus may be separate from the line(s), e.
g.
, coaxial cable, used to couple the antenna elements to the receiver circuitry.
Alternatively, the coaxial cable may be used as the bus in addition to the communications path by which signals received by the antenna are provided to the receiver circuitry.
From the users' standpoint, the steering can be automatic.
Control can be effected, in accordance with the invention, by a one or two-way digital link.
Use of a two-way link between the steerable antenna and antenna control circuitry provides for more advanced control functions, as compared to a one-way link
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