Steerable antenna and receiver interface for terrestrial broadcast

• US 20060145918A1
• Filed: 02/03/2006
• Published: 07/06/2006
• Est. Priority Date: 12/21/2000
• Status: Active Grant

• Current Assignee: Hitachi America Limited (Hitachi, Ltd.), Hitachi Home Electronics (America) Incorporated (Hitachi, Ltd.), Hitachi, Ltd.
• Original Assignee: Hitachi America Limited (Hitachi, Ltd.)
• Inventors: Henderson, John G.N., Scarpa, Carl
• Granted Patent: US 7,425,920 B2
• Time in Patent Office: Days
• US Class Current: 342/359
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 1/24 with receiving set
• CPC Class Codes: H01Q 3/2611 Means for null steering; Adaptive interference nulling
• CPC Class Codes: H01Q 7/005 with variable reactance for tuning the antenna

Abstract

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.

Claims

1. An apparatus for use with an antenna device having an electronically steerable antenna pattern, said antenna device supporting a plurality of antenna pattern positions, the apparatus comprising:

an antenna control module for generating a plurality of multi-bit digital control signals to steer said antenna pattern as a function of at least one signal measurement value corresponding to a signal received by said antenna device, each multi-bit digital control signal including at least a first antenna device control value and a second antenna device control value, said first and second antenna device control values providing different antenna control information.

2. The apparatus of claim 1, wherein the first antenna control value is a position indicator value indicating one of said plurality of antenna pattern positions to which said antenna device is to be steered.

3. The apparatus of claim 1, wherein said second antenna control value is a value used to provide additional antenna device control information.

4. The apparatus of claim 3, wherein said second value is a polarization control value.

5. The apparatus of claim 3, wherein said second value is a channel number value.

6. The apparatus of claim 3, wherein said second value is a gain value.

7. The apparatus of claim 1, further comprising:

a received signal processing module for generating said at least one signal measurement value.

8. The apparatus of claim 7, wherein said received signal processing module includes a demodulator module.

9. The apparatus of claim 7, further comprising:

a digital bus for coupling said antenna control circuitry to said antenna apparatus.

10. The apparatus of claim 9, wherein said digital bus is a serial bus.

11. The apparatus of claim 8, further comprising a communications link coupling said antenna device to said demodulator, said signal received by said antenna device and at least one of said multi-bit digital control signals being communicated over said communications link.

12. The apparatus of claim 1, wherein said antenna control circuitry includes means for determining when said antenna pattern position is in a position which produces less signal interference than at least one other antenna pattern position.

14. The apparatus of claim 2, wherein the apparatus further includes:

a multi-terminal adapter for connecting said apparatus to an antenna device, the multi-terminal adapter including a first terminal for receiving said broadcast signal from the antenna device, a second terminal for supplying power to said antenna device; and

a third terminal for coupling a control output of said antenna control module to the antenna device.

15. The apparatus of claim 2, wherein said apparatus is a television receiver module, said apparatus further comprising:

a tuner for filtering signals received from said antenna device; and

a demodulator for performing a demodulation operation on signals received by said antenna device and processed by said tuner.

13. The apparatus 2, wherein the antenna control module includes:

means for including channel information in at least some of said digital antenna control signals.

16. A method of controlling an antenna device, the method comprising:

receiving a signal from the antenna device; and

generating multi-bit antenna control signal used for controlling characteristics of an antenna, the control signal comprising;

a first signal component including one of;

a direction field including antenna pattern direction control information, a gain field including antenna gain information, a channel number field including a channel number, and a polarization field including antenna polarization information; and

a second signal component, said second signal component including a field which is different from the field included in said first signal component, said second signal component including one of;

a direction field including antenna pattern direction control information, a gain field including antenna gain information, a channel number field including a channel number, and a polarization field including antenna polarization information.

17. The method of claim 16, wherein said first signal component includes a direction field.

18. The method of claim 17, wherein said second signal component includes a gain signal field, said direction signal field including more bits than said gain signal field.

19. The method of claim 18, wherein generating the multi-bit antenna control signal further includes:

including a channel number field in said multi-bit antenna control signal, said channel number field being in addition to said direction signal field and said gain signal field.

20. The method of claim 19, wherein said channel number field includes fewer bits than said direction signal field but more bits than said gain signal field.

21. A method of controlling an antenna, the method comprising the steps of:

generating at least one digital control signal including a direction information field and at least one of a gain information field, channel number field, and polarization information field; and

transmitting said digital control signal to an antenna.

22. The method of claim 21, wherein the step of generating a digital control signal includes:

measuring a signal characteristic of a broadcast signal received by said antenna.

23. The method of claim 21, wherein said direction information field includes multiple bits and wherein generating said at least one digital control signal includes incorporating a multi-bit channel number field and a gain field into said digital control signal, said gain field including at least one bit.