Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1982-03-23
1984-06-05
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307492, 307542, 328145, 328162, H03K 5153, G06G 724
Patent
active
044530919
ABSTRACT:
A level detecting circuit for use in a noise reduction circuit and which produces a level detected output signal in response to an input signal, includes an operational amplifier with at least one feedback diode for logarithmically converting the input signal to produce a logarithmically converted signal; a first PN junction element comprised of a first diode supplied with the logarithmically converted signal; a second PN junction element comprised of a second diode connected in series with the first diode at a connection point, the series-circuit of the first and second diodes having a first saturation current; a first integrating capacitor having a first capacitance and connected to the connection point for producing an integrated signal; a third PN junction element comprised of series-connected third and fourth diodes connected in parallel with the series connection of the first and second diodes and having a second saturation current greater than the first saturation current; a second integrating capacitor having a second capacitance less than the first capacitance and connected to the second and fourth diodes; a reference current source for providing a reference current to the series-connected first and second diodes and series-connected third and fourth diodes, and an output circuit for producing the level detected output signal in response to the integrated signal, such that, upon an abrupt attenuation of the input signal, the level of the level detected output signal is maintained for a predetermined time to substantially eliminate low frequency band harmonic distortion.
REFERENCES:
patent: 3704425 (1972-11-01), Haigh
patent: 4375038 (1983-02-01), Crosby
Akagiri Kenzo
Katakura Masayuki
Ookouchi Motomi
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
Zazworsky John
LandOfFree
Level detecting circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Level detecting circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Level detecting circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1499766