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Class Information
Number: 327/46
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific signal discriminating (e.g., comparing, selecting, etc.) without subsequent control > By frequency > With predetermined frequency selection > Including plural frequency detection
Description: Subject matter wherein more than one signal frequency is detected by a single circuit or system.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7528632 |
Half bin linear frequency discriminator |
May. 5, 2009 |
| 7471116 |
Dynamic constant folding of a circuit |
Dec. 30, 2008 |
| 7274185 |
Methods of generating internal clock signals from external clock signals and of measuring the frequency of external clock signals and related frequency measuring circuits and semiconductor mem |
Sep. 25, 2007 |
| 7180345 |
Apparatus and a method to provide time-based edge-rate compensation |
Feb. 20, 2007 |
| 6949960 |
Semiconductor integrated circuit comprising functional modes |
Sep. 27, 2005 |
| 6940355 |
Circular geometry oscillators |
Sep. 6, 2005 |
| 6535023 |
Linearized digital phase-locked loop method |
Mar. 18, 2003 |
| 6278134 |
Bi-directional unipolar semiconductor light source |
Aug. 21, 2001 |
| 6081143 |
Frequency comparison and generation in an integrated processor |
Jun. 27, 2000 |
| 6005829 |
Method for characterizing interconnect timing characteristics |
Dec. 21, 1999 |
| 5790479 |
Method for characterizing interconnect timing characteristics using reference ring oscillator circuit |
Aug. 4, 1998 |
| 5699421 |
Telephone answering device with low cost dual tone multi-frequency detector |
Dec. 16, 1997 |
| 5661427 |
Series terminated clock deskewing apparatus |
Aug. 26, 1997 |
| 5469087 |
Control system using harmonic filters |
Nov. 21, 1995 |
| 5446771 |
Adaptive coherent signal detection method and apparatus |
Aug. 29, 1995 |
| 5408529 |
Dual tone detector operable in the presence of speech or background noise and method therefor |
Apr. 18, 1995 |
| 5349254 |
Call progress detection circuit |
Sep. 20, 1994 |
| 5317278 |
Switched active fault locate filter |
May. 31, 1994 |
| 4993052 |
Digitally-operating electrical equipment with counter for automatically adapting output to 50 Hz or 60 Hz input |
Feb. 12, 1991 |
| RE33381 |
Multiple system AM stereo receiver and pilot signal detector |
Oct. 9, 1990 |
| 4769610 |
Tone decoder |
Sep. 6, 1988 |
| 4651104 |
Frequency converter with automatic frequency control |
Mar. 17, 1987 |
| 4626629 |
Digital multifrequency signal receiver |
Dec. 2, 1986 |
| 4618981 |
Tone detector with pseudo phase locked loop |
Oct. 21, 1986 |
| 4614909 |
Apparatus for identifying digital multi-frequency signals |
Sep. 30, 1986 |
| 4541070 |
Pulse characteristic meter |
Sep. 10, 1985 |
| 4502049 |
Universal signalling tone receiver |
Feb. 26, 1985 |
| 4489280 |
Signal harmonic processor |
Dec. 18, 1984 |
| 4426728 |
Multiple system AM stereo receiver and pilot signal detector |
Jan. 17, 1984 |
| 4420658 |
Multiple tone signal system |
Dec. 13, 1983 |
| 4339715 |
Carrier-domain magnetometers with compensation responsive to variations in operating conditions |
Jul. 13, 1982 |
| 4322642 |
Frequency discriminating circuit |
Mar. 30, 1982 |
| 4286221 |
Multi-frequency signal receiving apparatus |
Aug. 25, 1981 |
| 4227255 |
Signal classifier |
Oct. 7, 1980 |
| 4215280 |
Phase responsive frequency detector |
Jul. 29, 1980 |
| 4211938 |
Tone detector |
Jul. 8, 1980 |
| 4119926 |
Apparatus and method for stabilized phase detection for binary signal tracking loops |
Oct. 10, 1978 |
| 4109239 |
Radio frequency alarm system including transmitting, coding and decoding circuitry |
Aug. 22, 1978 |
| 4109197 |
PRF Detection system and method |
Aug. 22, 1978 |
| 4072931 |
Radio frequency alarm system including transmitting, coding and decoding circuitry |
Feb. 7, 1978 |
| 3971998 |
Recursive detector-oscillator circuit |
Jul. 27, 1976 |
| 3965428 |
Spectrum-shape discriminating on/off target indicator |
Jun. 22, 1976 |
| 3949312 |
Frequency scanning means and method |
Apr. 6, 1976 |
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