US3757096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide band digital sine wave synthesizer
Assignee: Singer Co
•
Filing: 1972-04-24
•
Granted: 1973-09-04
•
Expires: 1992-04-24
Abstract
Abstract A solid state tone generator is provided which is capable of digitally synthesizing sine wave tones, and which has particular utility for producing tones for testing selective call paging receivers. The tone generator may be set to generate a plurality of tones, either continuously or in bursts, and either simultaneously or in sequence, so that it may be easily adapted for testing a wide variety of paging receivers used in a wide variety of different paging systems. Each of the tones may be set to any selected frequency in a range extending from 0.1 Hz to 9999.9 Hz. As will be described, decade rate scalers (DRS) are used in conjunction with a crystal oscillator to provide a digital output corresponding to a selected tone, and the digital output is then ultimately converted into a sine wave of the selected tone frequency.
Inventors
- 👤 B Moonier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:49
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/02; H03K4/026
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
519 words
A digital tone generator for producing at least one tone signal comprising: an oscillator for generating a reference signal having a predetermined reference frequency; a first decade rate scaler unit connected to said oscillator and responsive to said reference signal; a first manually adjustable binary coded decimal unit connected to said first decade rate scaler and adjustable to a predetermined decimal setting to produce a corresponding first binary coded decimal output and to apply said first binary coded decimal output to said first decade rate scaler to cause said first decade rate scaler to produce a first pulse output signal of a frequency corresponding to a predetermined sub-multiple of said reference signal as determined by said first binary coded output; a second manually adjustable binary coded decimal unit adjustable to a predetermined decimal setting to produce a corresponding second binary coded decimal output; logic circuitry selectively connecting said first binary coded decimal unit and said second binary coded decimal unit to said first decade rate scaler; manually adjustable timing circuitry connected to said logic circuitry for determining the time intervals in which said first binary coded decimal unit and said second binary coded decimal unit are connected to said first decade rate scaler; a second decade rate scaler connected to said oscillator and responsive to said reference signal; a third manually adjustable binary coded decimal unit connected to said second decade rate scaler and adjustable to a predetermined decimal setting to produce a corresponding third binary coded decimal output and to apply said third binary coded decimal output to said second decade rate scaler to cause said second decade rate scaler to produce a second pulse output signal of a frequency corresponding to a predetermined sub-multiple of said reference signal; a first up-down counter coupled to said first decade rate scaler and responsive to said first pulse output signal therefrom; a control circuit coupled to said first up-down counter for reversing the count thereof at a predetermined maximum and minimum count; a first digital/analog converter connected to said first updown counter for producing a first triangular wave having a selected frequency corresponding to the setting of said first or second binary coded decimal unit; a first triangular wave-sine wave converter connected to said first digital/analog converter and responsive to said first triangular wave for producing a corresponding first sine wave; a second updown counter coupled to said second decade rate scaler and responsive to said second pulse output signal; a control circuit connected to said second up-down counter for reversing the count thereof at a predetermined maximum and minimum count; a second digital/analog converter connected to said second up-down counter for producing a second triangular wave having a selected frequency corresponding to the setting of said third binary coded decimal unit; a second triangular wave-sine wave converter coupled to said second digital/analog converter and responsive to said second triangular wave for producing a corresponding second sine wave; and means including a summing amplifier connected to said first sine wave converter and to said second sine wave converter for producing first and second tone frequencies at the tone generator output.
Claim 2
Dependent Claim
519 words
A digital tone generator for producing at least one tone signal comprising: an oscillator for generating a reference signal having a predetermined reference frequency; a first decade rate scaler unit connected to said oscillator and responsive to said reference signal; a first manually adjustable binary coded decimal unit connected to said first decade rate scaler and adjustable to a predetermined decimal setting to produce a corresponding first binary coded decimal output and to apply said first binary coded decimal output to said first decade rate scaler to cause said first decade rate scaler to produce a first pulse output signal of a frequency corresponding to a predetermined sub-multiple of said reference signal as determined by said first binary coded output; a second manually adjustable binary coded decimal unit adjustable to a predetermined decimal setting to produce a corresponding second binary coded decimal output; logic circuitry selectively connecting said first binary coded decimal unit and said second binary coded decimal unit to said first decade rate scaler; manually adjustable timing circuitry connected to said logic circuitry for determining the time intervals in which said first binary coded decimal unit and said second binary coded decimal unit are connected to said first decade rate scaler; a second decade rate scaler connected to said oscillator and responsive to said reference signal; a third manually adjustable binary coded decimal unit connected to said second decade rate scaler and adjustable to a predetermined decimal setting to produce a corresponding third binary coded decimal output and to apply said third binary coded decimal output to said second decade rate scaler to cause said second decade rate scaler to produce a second pulse output signal of a frequency corresponding to a predetermined sub-multiple of said reference signal; a first up-down counter coupled to said first decade rate scaler and responsive to said first pulse output signal therefrom; a control circuit coupled to said first up-down counter for reversing the count thereof at a predetermined maximum and minimum count; a first digital/analog converter connected to said first updown counter for producing a first triangular wave having a selected frequency corresponding to the setting of said first or second binary coded decimal unit; a first triangular wave-sine wave converter connected to said first digital/analog converter and responsive to said first triangular wave for producing a corresponding first sine wave; a second updown counter coupled to said second decade rate scaler and responsive to said second pulse output signal; a control circuit connected to said second up-down counter for reversing the count thereof at a predetermined maximum and minimum count; a second digital/analog converter connected to said second up-down counter for producing a second triangular wave having a selected frequency corresponding to the setting of said third binary coded decimal unit; a second triangular wave-sine wave converter coupled to said second digital/analog converter and responsive to said second triangular wave for producing a corresponding second sine wave; and means including a summing amplifier connected to said first sine wave converter and to said second sine wave converter for producing first and second tone frequencies at the tone generator output.
Claim 3
Dependent Claim
76 words
The digital tone generator defined in claim 1, and which includes a fourth manually adjustable binary coded decimal unit; and a second logic circuit for selectively connecting said third binary coded decimal unit and said fourth binary coded decimal unit to said second decade rate scaler for causing said second digital/analog converter to produce a pair of triangular waves having selected frequencies corresponding respectively to the setting of said third and fourth binary coded decimal units.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |