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pro vyhledávání: '"D. B. Penick"'
Autor:
D. B. Penick, K. E. Fultz
Publikováno v:
Bell System Technical Journal. 44:1405-1451
T1 carrier provides 24 voice channels by time division multiplexing and pulse code modulation (PCM). Each voice channel is sampled 8000 times a second and each sample is coded into a 7-digit binary word. Provision for signaling and synchronization ra
Publikováno v:
Bell System Technical Journal. 28:165-180
With the rapid expansion of broad-band carrier telephone systems throughout the country, the use of these facilities for program transmission has become desirable. This paper describes a carrier program system capable of transmitting a band up to abo
Autor:
D. B. Penick
Publikováno v:
Review of Scientific Instruments. 6:115-120
A number of balanced, single‐tube, direct‐current amplifier circuits are compared, which are applicable to the four‐element, low grid‐current vacuum tube. The balance equations are stated for the most generally useful circuit, and magnitudes
Autor:
D. B. Penick
Publikováno v:
Bell System Technical Journal. 13:614-633
The microphonic response of different types of vacuum tubes to the same mechanical agitation covers a 70 db range of levels. Tubes of the same type, on the average, cover a range of about 30 db. These response levels are too sensitive to minute varia