Broadband Codecs for an Experimental 224 Mb/s PCM Terminal
- 1 November 1965
- journal article
- website
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Bell System Technical Journal
- Vol. 44 (9) , 1887-1940
- https://doi.org/10.1002/j.1538-7305.1965.tb03153.x
Abstract
High-speed PCM codecs (coders and decoders) have been constructed to handle broadband signals such as a mastergroup of telephone channels or an NTSC color TV signal. Two widely different approaches to the realization of the coding function are described. The first and earliest version utilizes a beam coding tube to convert the analog signal to digital form. The second approach employs a tandem array of solid-state stages to perform the required conversion. Associated circuits to implement the filtering, sampling, holding, timing, translation, framing, and decoding functions in a PCM codec are also described. Analysis results, experience gained in design, and measured performance of the coders and the associated circuits that make up a PCM codec demonstrate that they can be produced to meet stringent performance objectives.Keywords
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