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Old 4th January 2011, 09:12 PM   #1
tvi is offline tvi  Australia
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Default Denon/Marantz Current Feedback amp patent
JP2010035117 2010-02-12
SARASHINA YASUHIRO; MIKAMI SATOSHI
D & M HOLDINGS INC

Quote:
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.
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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Last edited by tvi; 4th January 2011 at 09:14 PM. Reason: furgot link
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Old 5th October 2011, 04:27 AM   #2
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interesting:
to have a signal path simplified by eliminating a complicated signal path.

captain obvious lol
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Old 6th October 2011, 09:34 AM   #3
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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
Bob Cordell Interview: Error Correction
and
An Amplifier without feedback called Pax, What about Vitus SS-101?
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Old 6th October 2011, 12:11 PM   #4
Bonsai is online now Bonsai  Taiwan
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Looks interesting.
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http://www.hifisonix.com/
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Old 6th October 2011, 03:30 PM   #5
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Quote:
Originally Posted by tiefbassuebertr View Post
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
Bob Cordell Interview: Error Correction
and
An Amplifier without feedback called Pax, What about Vitus SS-101?
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
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Old 6th October 2011, 06:30 PM   #6
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Quote:
Originally Posted by tvi View Post
JP2010035117 2010-02-12
SARASHINA YASUHIRO; MIKAMI SATOSHI
D & M HOLDINGS INC



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
That patent shouldnt have been issued as it is vitually a rip off of the Alexander amp.
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Old 6th October 2011, 07:27 PM   #7
sajti is offline sajti  Hungary
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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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Old 7th October 2011, 04:48 PM   #8
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Originally Posted by sajti View Post
The amplifiers are absolutely different, than the Alexander amp.
The principals used are the same....
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Old 7th October 2011, 06:06 PM   #9
sajti is offline sajti  Hungary
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Quote:
Originally Posted by michaelkiwanuka View Post
The principals used are the same....
Maybe yes. Only the sound is much better.

Sajti
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