Multiplex communications – Wide area network – Packet switching
Patent
1981-06-18
1983-08-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
179 84VF, H04J 312
Patent
active
043995357
ABSTRACT:
A digital tone generator for use with a digital telecommunication system for simultaneous generation of continuous and cyclically repeated discontinuous tone signals each composed of at least one frequency component incorporates sequencing control means, amplitude control means, amplitude value generating means and output means. The sequencing control means generates consecutively incremented reference address signals directing the course of an operating cycle, thus allowing for some amount of parallel processing of the sub-units. The amplitude control means produce amplitude control signals which determine varying mean amplitude values of a discontinuous digital tone signal at the commencement of the rising and trailing ends of each pulse. Any stepwise adjustment of the mean amplitude value takes place coincidentally with an instantaneous amplitude of zero value and in accordance with a predetermined attenuation curve. The amplitude value generating means connected to receive the reference address signals and the amplitude control signals furnish a digital encoded signal representing an instantaneous amplitude value of a respective digital signal to output means for transmitting the same onto a time multiplexed transmission line.
REFERENCES:
patent: 3870826 (1975-03-01), Carbrey et al.
patent: 3985965 (1976-10-01), Field et al.
patent: 4110562 (1978-08-01), Moed
patent: 4205203 (1980-05-01), Mehta et al.
Milde Jr. Karl F.
Olms Douglas W.
Siemens Corporation
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