US3829783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generator for generating a number of selected frequencies
Assignee: ZUUREN E VAN
•
Filing: 1973-02-26
•
Granted: 1974-08-13
•
Expires: 1993-02-26
Abstract
Abstract A generator for generating a number of selected frequencies, comprising a pulse oscillator and a number of dividers which are connected thereto, a second number of dividers which also coupled to the former dividers via a switching network in order to adjust, under the control of the switching network, dividends which produce desired combinations of frequencies derived from the oscillator frequencies, in particular tone frequencies for tone pushbutton selection signalling, the dividers of the second group also being binary-to-digital signal converters to which first-order RC-networks are connected in order to suppress higher harmonics.
Inventors
- 👤 G Groenendaal
- 👤 H Cool
- 👤 Vos J De
- 👤 Zuuren E Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:58
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/50; H04M1/505
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A generator for simultaneously generating two frequencies, comprising a fixed frequency oscillator, a plurality of first dividers connected in parallel each having an input connected to said oscillator, two second dividers each composed of a modified switch ring counter and a digital to analog converter one of said second dividers having a division ratio equal to 0.5765 times the other of the second dividers, and switching means for selectively connecting one of the second dividers to one of the first dividers and for selectively connecting the other of the second dividers to one of the first dividers.
Claim 2
Dependent Claim
97 words
A generator for simultaneously generating two frequencies, comprising a fixed frequency oscillator, a plurality of first dividers connected in parallel each having an input connected to said oscillator, two second dividers each composed of a modified switch ring counter and a digital to analog converter one of said second dividers having a division ratio equal to 0.5765 times the other of the second dividers, and switching means for selectively connecting one of the second dividers to one of the first dividers and for selectively connecting the other of the second dividers to one of the first dividers.
Claim 3
Dependent Claim
183 words
A generator as claimed in claim 1, wherein each divider of the second group comprises an input terminal, an output terminal and a number of cascade connected bistable elements, each of said bistable elements being provided with a set input, a signal input, a reset input, an inverted signal output, and a shift pulse input, the set input and the reset input of the second through the last bistable element inclusive of the cascade connection being connected to the signal output and the inverted signal output of the first through the last bistable element being connected to the signal input of the first bistable element, the signal output of the next to last bistable element being connected to the reset input of the first bistable element for a divider having a dividend 2N-1 (N 1, 2 . . . ), the shift pulse inputs of all bistable elements of a divider being connected to the input terminal thereof, and a separate weighting resistor connecting each of the signal outputs of the bistable elements of the divider to the output terminals of the divider.
Claim 4
Dependent Claim
190 words
A generator as claimed in claim 1, wherein each divider of the second group comprises an input terminal, an output terminal and a number of cascade-connected bistable elements, each of said bistable elements being provided with a set input, a signal output, a reset input, an inverted signal output, and a shift pulse input, the set input and the reset input of the second through the last bistable element inclusive of the cascade connection being connected to the signal output and the inverted signal output of the first through the last bistable element but one, the inverter signal output of the last bistableelement being connected to the signal input of the first bistable element, the signal output of the last bistable element being connected to the reset input of the first bistable element for a divider having the dividend 2N (N 1, 2, . . . ), the shift pulse inputs of all bistable elements of a divider being connected to the input terminal thereof, and a separate weighting resistor connecting each of the signal outputs of the bistable elements of the divider to the output terminal of the divider.
Claim 5
Dependent Claim
25 words
A generator as claimed in claim 3, wherein the outputs of the dividers of the second group are interconnected, one first-order RC-network being connected thereto.
Claim 6
Dependent Claim
36 words
A generator for generating the frequencies recommended by C.C.I.T.T. Com XI in Document No. 101 for tone push-button selection signalling as claimed in claim 1, wherein the first group of dividers is formed by four dividers.
Claim 7
Dependent Claim
32 words
A generator as claimed in claim 1, wherein the dividends of the first group of dividers are 101, 94, 85 and 77, the dividends of the second grouP being 26 and 11.
Claim 8
Dependent Claim
32 words
A generator as claimed in claim 1, wherein the dividends of the first group of dividers are 23, 21, 19 and 17, the dividends of the second group being 7 and 4.
Claim 9
Dependent Claim
34 words
A generator as claimed in claim 1, wherein the dividends of the first group of dividers are 35, 32, 29 and 26, the dividends of the second group of dividers being 19 and 11.
References Cited (Backward Citations)
US3500213A
Cited
US3538256A
Cited
US3590131A
Cited
US3610801A
Cited
US3657657A
Cited
US3671871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |