SE7600157L - CIRCUIT FOR FREQUENCY SIGNAL SYSTEM - Google Patents
CIRCUIT FOR FREQUENCY SIGNAL SYSTEMInfo
- Publication number
- SE7600157L SE7600157L SE7600157A SE7600157A SE7600157L SE 7600157 L SE7600157 L SE 7600157L SE 7600157 A SE7600157 A SE 7600157A SE 7600157 A SE7600157 A SE 7600157A SE 7600157 L SE7600157 L SE 7600157L
- Authority
- SE
- Sweden
- Prior art keywords
- frequencies
- division
- dividers
- interleaved
- pulse trains
- Prior art date
Links
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000004377 microelectronic Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
- H04M1/505—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies signals generated in digital form
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
- H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Manipulation Of Pulses (AREA)
Abstract
1529851 Waveform generators GENERAL INSTRUMENT MICROELECTRONICS Ltd 8 Jan 1976 [10 Jan 1975] 1203/75 Heading H3H [Also in Division G4] In a 2 out of 8 tone generator, clock pulses are frequency divided in dividers 3A, 3B whose division ratios are set in accordance with respective ones of the 2 frequencies to be generated, the divided clock pulses are fed to stochastic conversion means which produces respective pulse trains whose repetition frequencies vary at the respective frequencies and these are then interleaved in time and filtered to produce the desired 2 out of 8 tone signal. In Figs. 1A, 1B, a keyboard (not shown) marks one of leads 13A and one of leads 13B to set the division ratios of dividers 3A, 3B. For some frequencies, non-integral division is used, this being achieved by varying an integral division factor by unity for alternate cycles, Fig. 3 (not shown). The outputs of the dividers are fed to respective sine-wave value generators 4A, 4B which produce sequences of 3-bit binary numbers: 6, 3, 1, 0, 1, 3, 6 and positive and negative half cycle signals to respective comparators 6A, 6B, receiving 4-bit pseudo-random signals from a noise generator 8, and outputting respective stochastic pulse trains whose instantaneous frequencies vary in an approximately sinusoidal manner at the desired 2 of 8 frequencies. These pulse trains are interleaved in circuit 9, Fig. 12 (not shown) which includes means for varying the proportions in which the trains are interleaved to provide adjustable preemphasis for the higher frequency. Details of all the circuit blocks and frequencies are given.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762658678 DE2658678C2 (en) | 1976-01-09 | 1976-12-23 | Process for the powder metallurgical production of stabilized ferritic stainless chromium steels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB120375A GB1529851A (en) | 1975-01-10 | 1975-01-10 | Frequency-signalling circuit for a telephone |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7600157L true SE7600157L (en) | 1976-07-12 |
SE416100B SE416100B (en) | 1980-11-24 |
Family
ID=9717956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7600157A SE416100B (en) | 1975-01-10 | 1976-01-09 | CIRCUIT FOR DIGITAL SYNTHETIZATION OF A SIGNAL CONSISTING OF M OVERLAYED WAVE FORMS WITH DIFFERENT FREQUENCIES |
Country Status (5)
Country | Link |
---|---|
CA (1) | CA1031462A (en) |
DE (1) | DE2600606C2 (en) |
FR (1) | FR2297526A1 (en) |
GB (1) | GB1529851A (en) |
SE (1) | SE416100B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2452823A1 (en) * | 1979-03-30 | 1980-10-24 | Texas Instruments France | LF signal generator - is esp. for telephone systems and maintains HF stability by using ceramic oscillator |
GB2121627B (en) * | 1982-06-02 | 1986-01-15 | Plessey Co Plc | Direct digital synthesiser |
DE69610576T2 (en) * | 1995-05-19 | 2001-05-31 | Matsushita Electric Works Ltd | Electric shaver cutting unit |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7008014A (en) * | 1969-06-02 | 1970-12-04 | ||
US3820028A (en) * | 1971-08-27 | 1974-06-25 | J Thomas | Digital tone signal generator |
NL160687C (en) * | 1972-06-10 | 1979-11-15 | Philips Nv | TONE GENERATOR FOR GENERATING SELECTED FREQUENCIES. |
US3787836A (en) * | 1972-06-15 | 1974-01-22 | Bell Telephone Labor Inc | Multitone telephone dialing circuit employing digital-to-analog tone synthesis |
-
1975
- 1975-01-10 GB GB120375A patent/GB1529851A/en not_active Expired
-
1976
- 1976-01-09 CA CA243,288A patent/CA1031462A/en not_active Expired
- 1976-01-09 DE DE19762600606 patent/DE2600606C2/en not_active Expired
- 1976-01-09 SE SE7600157A patent/SE416100B/en not_active IP Right Cessation
- 1976-01-12 FR FR7600633A patent/FR2297526A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
SE416100B (en) | 1980-11-24 |
CA1031462A (en) | 1978-05-16 |
GB1529851A (en) | 1978-10-25 |
FR2297526B1 (en) | 1978-05-12 |
DE2600606A1 (en) | 1976-07-15 |
DE2600606C2 (en) | 1985-06-20 |
FR2297526A1 (en) | 1976-08-06 |
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