http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1058784-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5cb7fcecd190e704fa84460463321203 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04Q1-457 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04Q1-457 |
| filingDate | 1976-11-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1979-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f2eb85b7d1fb4e739a661fdf908e3160 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c6e465264961446f5c6e3f6daff27e54 |
| publicationDate | 1979-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1058784-A |
| titleOfInvention | Digital decoder for multiple frequency telephone signalling |
| abstract | Abstract of the Disclosure A multiple-frequency decoder which measures the two-tone output from a multiple-frequency dial type telephone and identifies what number was dialed. A unique binary code is produced as a timed output for each number dialed. In addition, the decoder has provision for detecting and providing as a separate output a unique binary output word whenever a preselected transfer digit, e.g. a "1", "2" or "3" is dialed. With this additional output data, transfer relays can be operated. The decoder inputs are derived from high and low pass filters. The decoder differentiates between valid multiple-frequency tones and extraneous noise, such as voice signals, completely digitally, as follows: once the digital measurement of one cycle of each of the multiple incoming frequencies is made, the combination of all frequency measurements is stored as a k-bit binary word. In order for an incoming signal to be considered valid, the same k-bit binary word must occur n consecutive times, where n is preselected based on the degree of noise immunity required. |
| priorityDate | 1975-11-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 21.