The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 2013
Filed:
Sep. 25, 2007
Boyd Mcgregor Murray, North Epping, AU;
David Andrew Abbott, Abbotsford, AU;
Joseph Abraham Pathikulangara, Epping, AU;
John Bunton, St. Clair, AU;
Valeriy Dyadyuk, Cremorne, AU;
Boyd McGregor Murray, North Epping, AU;
David Andrew Abbott, Abbotsford, AU;
Joseph Abraham Pathikulangara, Epping, AU;
John Bunton, St. Clair, AU;
Valeriy Dyadyuk, Cremorne, AU;
Commonwealth Scientific and Industrial Research Organisation, Campbell, AU;
Abstract
A circuit for transmission and reception of multi-channel communications is disclosed. The transmitter path includes a digital modulation circuit receiving multiple channel binary data, and for each channel generating a digital representation of the data. A digital-to-analogue (D/A) conversion circuit (-) is provided for each data channel. Each D/A conversion circuit receives and converts respective channel digital representations to produce a resultant band limited analogue signal (-). The band limitation arises due to a characteristic of said channel digital representations. A bandpass filter (-) receives and filters each analogue channel signal. The band width to the start of the stop band of each bandpass filter is wider than a respective band limited analogue channel signal and wider than the Nyquist bandwidth arising from the sampling rate of said D/A conversion circuit. In this way, signal power in unwanted Nyquist zones is effectively removed. A frequency translation circuit (-) abuts the multiple channel bandpass filtered analogue signals in the frequency domain without any guard bands between adjacent channel signals.