{"title":"Pulse-Interval Modulation Applicable to Narrowband Transmission","authors":"Akio Okazaki","doi":"10.1109/TCATV.1978.285756","DOIUrl":null,"url":null,"abstract":"Pulse-interval modulation (PIM) is reviewed considering its application to the voice band transmission of still picture signals in industrial TV systems. Although PIM seems to have scarcely been utilized in practice, some advantages as an analog pulse modulation can be expected in the case of narrowband transmission. As to the signal-to-noise ratio and the analog message bandwidth, comparisions with PPM and FM are made, which proves that PIM is suited for the TV signal transmission. The dominant defect of PIM is the matter concerning the errors introduced into the pulse spacing by the mutual interferences of bandlimited pulses. Assuming an ideal filter, the effects of bandlimiting are discussed. The differential gain characteristics, and the interference outputs owing to the unwanted lower sidebands of a pulse train are examined, which indicates the effectiveness of lowpass filtering of post-detection signals.","PeriodicalId":100638,"journal":{"name":"IEEE Transactions on Cable Television","volume":"CATV-3 4","pages":"155-164"},"PeriodicalIF":0.0000,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TCATV.1978.285756","citationCount":"17","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Cable Television","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/4065119/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 17
Abstract
Pulse-interval modulation (PIM) is reviewed considering its application to the voice band transmission of still picture signals in industrial TV systems. Although PIM seems to have scarcely been utilized in practice, some advantages as an analog pulse modulation can be expected in the case of narrowband transmission. As to the signal-to-noise ratio and the analog message bandwidth, comparisions with PPM and FM are made, which proves that PIM is suited for the TV signal transmission. The dominant defect of PIM is the matter concerning the errors introduced into the pulse spacing by the mutual interferences of bandlimited pulses. Assuming an ideal filter, the effects of bandlimiting are discussed. The differential gain characteristics, and the interference outputs owing to the unwanted lower sidebands of a pulse train are examined, which indicates the effectiveness of lowpass filtering of post-detection signals.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
