US3715726A
Expired / Lapsed
US
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Selective tone signalling apparatus
Assignee: Wang Laboratories Inc
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Filing: 1971-09-16
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Granted: 1973-02-06
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Expires: 1991-09-16
Abstract
Abstract Sequential tone generator useful in paging applications. Three digit call numbers are entered into a register for temporary storage from an input device. Values indicative of the tones in the tone repertoire are stored in a first memory. Encoder values indicative of a desired tone encoding scheme are stored in a second memory. The stored call number is employed to address the encoder values of the second memory and to modify them so as to form the first memory addresses of the tone values specified by the call number. The addressed tone values are employed as divisor values in a frequency divider network to generate the tones.
Inventors
- 👤 G Wallin
- 👤 G Stapleford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:08
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/18; H04W88/185; H04W88/188; G; G08; G08B; G08B3/00; G08B3/10; G08B3/1008; G08B3/1016; G08B3/1025; G08B3/1066
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
Signalling apparatus for generating signal sequences, the signals of each sequence being chosen from a set of signal tones, said apparatus comprising: input means for providing call numbers, each comprised of a plurality of digit codes and each corresponding to a different tone sequence; a register responsive to said input means for temporarily storing each said provided call number; a memory for storing values indicative of the tones in said set at different addressable locations therein; memory readout means responsive to a call number stored in said register to address in sequence the tone values corresponding to the stored call number; and means responsive to said addressed values to generate in sequence the tone signals indicative of said addressed tone values.
Claim 2
Dependent Claim
121 words
Signalling apparatus for generating signal sequences, the signals of each sequence being chosen from a set of signal tones, said apparatus comprising: input means for providing call numbers, each comprised of a plurality of digit codes and each corresponding to a different tone sequence; a register responsive to said input means for temporarily storing each said provided call number; a memory for storing values indicative of the tones in said set at different addressable locations therein; memory readout means responsive to a call number stored in said register to address in sequence the tone values corresponding to the stored call number; and means responsive to said addressed values to generate in sequence the tone signals indicative of said addressed tone values.
Claim 3
Dependent Claim
121 words
Signalling apparatus for generating signal sequences, the signals of each sequence being chosen from a set of signal tones, said apparatus comprising: input means for providing call numbers, each comprised of a plurality of digit codes and each corresponding to a different tone sequence; a register responsive to said input means for temporarily storing each said provided call number; a memory for storing values indicative of the tones in said set at different addressable locations therein; memory readout means responsive to a call number stored in said register to address in sequence the tone values corresponding to the stored call number; and means responsive to said addressed values to generate in sequence the tone signals indicative of said addressed tone values.
Claim 4
Dependent Claim
121 words
Signalling apparatus for generating signal sequences, the signals of each sequence being chosen from a set of signal tones, said apparatus comprising: input means for providing call numbers, each comprised of a plurality of digit codes and each corresponding to a different tone sequence; a register responsive to said input means for temporarily storing each said provided call number; a memory for storing values indicative of the tones in said set at different addressable locations therein; memory readout means responsive to a call number stored in said register to address in sequence the tone values corresponding to the stored call number; and means responsive to said addressed values to generate in sequence the tone signals indicative of said addressed tone values.
Claim 5
Dependent Claim
116 words
The invention as set forth in claim 1 wherein said sequential tone generating means includes: means for providing a clock pulse train; a counter for counting the pulses of said train so as to emit an output pulse each time a predetermined count value is attained: means responsive to said output pulse for loading a currently addressed tone value into said counter sUch that the counter repetitively counts from said loaded tone value to said predetermined value to emit a train of output pulses for each addressed tone value; and means for shaping the output pulse train of said counter to produce a nearly sinusoidal signal, the frequency of which corresponds to said loaded tone value.
Claim 6
Dependent Claim
38 words
The invention as set forth in claim 2 wherein said tone values are directly proportional to the periods of the tones in said set; and wherein said predetermined count value is the highest state attainable by said counter.
Claim 7
Dependent Claim
76 words
The invention as set forth in claim 1 wherein said memory readout means includes: a second memory for storing values indicative of a tone encoding scheme; means including a first digit code of a stored call number for addressing said encoder values; and means responsive to said addressed encoder values and to the other digit codes in the stored call number to sequentially generate the addresses of the tone values specified by the stored call number.
Claim 8
Dependent Claim
126 words
The invention as set forth in claim 4 and further including: a tone timer for generating first and second timing signals corresponding to first and second sequential tone generating intervals, respectively, said tone timer further including control means for producing a control signal having first and second values during the first and second intervals, respectively; and wherein said encoder value address means further includes said control means to cause said first digit code to address a first group of encoder values during the first tone interval and a second group of encoder values during the second tone interval; and wherein said tone value addresses include first and second tone value addresses generated during said first and second tone intervals, respectively, by said tone value generating means.
Claim 9
Dependent Claim
75 words
The invention as set forth in claim 5 wherein said tone value address generating means includes; a multiplexing network responsive to said control signal to select second and third digit codes of said stored call number during the first and second tone intervals, respectively; and means for logically combining the addressed first and second group encoder values with the selected second and third digit codes to produce said first and second tone value addresses, respectively.
Claim 10
Dependent Claim
36 words
The invention as set forth in claim 6 wherein said logical combining means is an adder which algebraically sums the addressed encoder values with the multiplexer selected digit code values to produce said tone value addresses.
Claim 11
Dependent Claim
86 words
The invention as set forth in claim 7 wherein said tone value memory has a diagonal tone value stored therein; wherein at least one of the first group values is identical to one of the second group values stored in the second memory; wherein diagonal tone means responds to the addressing of said one first group value and to the identity of the second and third digit codes to cause said second memory, said multiplexer and said adder to generate the address of said diagonal tone.
Claim 12
Dependent Claim
116 words
The invention as set forth in claim 8 wherein said sequential tone generating means includes: means for providing a clock pulse train; a counter for counting the pulses of said train so as to emit an output pulse each time a predetermined count value is attained; means responsive to said output pulse for loading a currently addressed tone value into said counter such that the counter repetitively counts from said loaded tone value to said predetermined value to emit a train of output pulses for each addressed tone value; and means for shaping the output pulse train of said counter to produce a nearly sinusoidal signal, the frequency of which corresponds to said loaded tone value.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |