GB1072776A - Arrangement for the generation and reception of voice-frequency keysender-coded signals in telephone systems - Google Patents
Arrangement for the generation and reception of voice-frequency keysender-coded signals in telephone systemsInfo
- Publication number
- GB1072776A GB1072776A GB3322464A GB3322464A GB1072776A GB 1072776 A GB1072776 A GB 1072776A GB 3322464 A GB3322464 A GB 3322464A GB 3322464 A GB3322464 A GB 3322464A GB 1072776 A GB1072776 A GB 1072776A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tones
- receivers
- discriminates
- aug
- transmit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
1,072,776. Automatic exchange equipment. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. Aug. 14, 1964 [Aug. 16, 1963], No. 33224/64. Heading H4K. Subscribers' keysenders transmit in two-outof-six audio frequency code by means of three generators each of which can send one or other of two 'possible tones, one generator being suppressed while the other two transmit, the receiving equipment comprising three receivers each of which discriminates between two tones of adjacent frequency. One of the receivers shown in Fig. 1 selects the tone pair by way of a band-pass filter L1, L2, C1 to C3 and discriminates between them in a resonant circuit L3, C4, tuned to the mean of the two tones. The output of a rectifier G1 or G2 switches transistor Ts2 or Ts3 to control bipolar outputs m and n which indicate which of the two tones is being received and which is not. The six tones are chosen to lie within an octave to reduce harmonic interference. An amplitude limiter is placed in the common input to the three receivers to compensate for the attenuation differences of subscriber's lines. To guard against the mixed frequencies introduced by the limiter the switching transistors Ts2 and Ts3 are provided with integrating capacitors C11 and C12. To avoid spurious responses the bipolar outputs of the receivers may be sampled only after they are fully switched.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET24501A DE1175287B (en) | 1963-08-16 | 1963-08-16 | Circuit arrangement for the reception of tone-frequency code touch dial signals in telecommunications, in particular telephone switching systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1072776A true GB1072776A (en) | 1967-06-21 |
Family
ID=7551490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3322464A Expired GB1072776A (en) | 1963-08-16 | 1964-08-14 | Arrangement for the generation and reception of voice-frequency keysender-coded signals in telephone systems |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH437436A (en) |
| DE (1) | DE1175287B (en) |
| GB (1) | GB1072776A (en) |
-
1963
- 1963-08-16 DE DET24501A patent/DE1175287B/en active Pending
-
1964
- 1964-05-27 CH CH689064A patent/CH437436A/en unknown
- 1964-08-14 GB GB3322464A patent/GB1072776A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH437436A (en) | 1967-06-15 |
| DE1175287B (en) | 1964-08-06 |
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