Denon/Marantz Current Feedback amp patent

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tvi

tvi

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Joined 2001
#1
JP2010035117 2010-02-12
SARASHINA YASUHIRO; MIKAMI SATOSHI
D & M HOLDINGS INC

PROBLEM TO BE SOLVED:
To improve the quality of an audio signal to be output in a current feedback amplifier that amplifies the audio signal.
SOLUTION:
The current feedback amplifier that amplifies an audio signal is configured so as to compose an amplifier circuit that amplifies an audio signal, and a feedback circuit for an audio signal and a feedback circuit for a direct current component independently of each other in order to improve the quality of the audio signal output from the amplifier circuit, and to have a signal path simplified by eliminating a complicated signal path.
Click to expand...

Images from patent below, the rest of the patent is in Japanese.

Just found this and thought some might find it of interest?

rgds
jms
 

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#3
Quote from
espacenet - Bibliographic data

Abstract of JP 2010035117 (A)
PROBLEM TO BE SOLVED: To improve the quality of an audio signal to be output in a current feedback amplifier that amplifies the audio signal. ; SOLUTION: The current feedback amplifier that amplifies an audio signal is configured so as to compose an amplifier circuit that amplifies an audio signal, and a feedback circuit for an audio signal and a feedback circuit for a direct current component independently of each other in order to improve the quality of the audio signal output from the amplifier circuit, and to have a signal path simplified by eliminating a complicated signal path. ; COPYRIGHT: (C)2010,JPO&INPIT

.........................................................................

I think, Jan Didden had a similar idea - go to post #3182 about
http://www.diyaudio.com/forums/soli...terview-error-correction-319.html#post1472359
and
http://www.diyaudio.com/forums/soli...ack-called-pax-what-about-vitus-ss-101-a.html
 
#5
tiefbassuebertr said:
Quote from
espacenet - Bibliographic data

Abstract of JP 2010035117 (A)
PROBLEM TO BE SOLVED: To improve the quality of an audio signal to be output in a current feedback amplifier that amplifies the audio signal. ; SOLUTION: The current feedback amplifier that amplifies an audio signal is configured so as to compose an amplifier circuit that amplifies an audio signal, and a feedback circuit for an audio signal and a feedback circuit for a direct current component independently of each other in order to improve the quality of the audio signal output from the amplifier circuit, and to have a signal path simplified by eliminating a complicated signal path. ; COPYRIGHT: (C)2010,JPO&INPIT

.........................................................................

I think, Jan Didden had a similar idea - go to post #3182 about
http://www.diyaudio.com/forums/soli...terview-error-correction-319.html#post1472359
and
http://www.diyaudio.com/forums/soli...ack-called-pax-what-about-vitus-ss-101-a.html
Click to expand...

I think this patent is pretty non-sensical. I fail to see how having dual feedback loops (DC and AC separate) improve anything in the 'audio quality' whatever THAT means. It just adds MORE complexity, and it isn't even new.

Hawksford's error correction concept which is the basis of Bob Cordell's and my paX amp is different, although, in the final analysis, it IS a form of NFB.

jan didden
 
#7
The amplifiers are absolutely different, than the Alexander amp. There is separated voltage amplifier, and power stage, to reduce the back EMF. And that amplifiers (PM11 os SM11) are sounds really good.

Sajti
 
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