СПИСОК патентов США - подгруппа МПК16 H04Q1/448
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| № п/п | Номер патента | Название патента | |||
1992 | |||||
| 1 | 5099498 | Method for suppressing quantization noises superimposed on a sinusoidal audible tone transmitted in a digital telecommunications exchange system | |||
1990 | |||||
| 2 | 4972466 | Digital composite tone alerting | |||
1989 | |||||
| 3 | 4849688 | Detection of single-frequency signals | |||
| 4 | 4797931 | Audio frequency signal identification apparatus | |||
1987 | |||||
| 5 | 4696031 | Signal detection and discrimination using waveform peak factor | |||
| 6 | 4680758 | Switching system having tone trunk | |||
1986 | |||||
| 7 | 4590595 | Apparatus for detecting in-band single frequency signaling tones from FDM channels | |||
| 8 | 4563681 | Tone receiver for digital data communication systems | |||
1985 | |||||
| 9 | 4550225 | AC Signal-activated switching apparatus | |||
| 10 | 4539692 | Digital automatic gain control circuit for PCM signals | |||
| 11 | 4534041 | Digital circuit for determining the envelope frequency of PCM encoded call progress tones in a telephone system | |||
| 12 | 4528664 | Call progress signal monitor and method for telephone systems | |||
1984 | |||||
| 13 | 4439639 | Digital circuit and method for the detection of call progress tones in telephone systems | |||
1983 | |||||
| 14 | 4401860 | Frequency signaling method and apparatus with dynamic compensation for frequency errors | |||
1982 | |||||
| 15 | 4322686 | Frequency comparator circuit | |||
| 16 | 4313107 | Tone signal detectors | |||
1981 | |||||
| 17 | 4277650 | Single frequency tone receiver | |||
1980 | |||||
| 18 | 4231018 | Tone signal detector | |||
| 19 | 4218589 | Method and apparatus for testing tone generators | |||
| 20 | 4199729 | Variable peak detector | |||
| 21 | 4197502 | Digital signal detector | |||
| 22 | 4194092 | Device for detecting a frequency in a PCM coded signal | |||
1978 | |||||
| 23 | 4097812 | Frequency selective detector circuit | |||
1977 | |||||
| 24 | 4064488 | Sampled signal detector | |||
| 25 | 4047114 | Digital detector | |||
| 26 | 4034300 | Circuit arrangement for evaluating received oscillations of a predetermined frequency | |||
1976 | |||||
| 27 | 3993875 | Tone receiver | |||
| 28 | 3990006 | Digital tone detector using concatenated detection intervals | |||
| 29 | 3979562 | Decoder | |||
| © 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017 | |||||