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Broadcast Transmission Systems, IRE Transactions on

Issue 1 • Date Feb. 1957

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Displaying Results 1 - 13 of 13
  • Table of contents

    Publication Year: 1957 , Page(s): c1
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  • IRE Professional Group on Broadcast Transmission Systems

    Publication Year: 1957
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  • Automatic Level Control for Fill Systems

    Publication Year: 1957 , Page(s): 1 - 5
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  • Reduction of Co-Channel Television Interference By Precise Frequency Control of Television Picture Carriers

    Publication Year: 1957 , Page(s): 6 - 14
    Cited by:  Papers (4)
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    It is a matter of record that the visibility of co-channel interference has maxima and minima at carrier offset frequencies which are a multiple of frame frequency. Subjective tests were made in the laboratory to determine the possible reduction in the visibility of co-channel interference by precise carrier frequency control and the stability requirements on the carrier frequency. The tests show an improvement of 12 db in the tolerable ratio of desired carrier to undesired carrier for an offset of 10,010 cycles and 18 db for an offset of 20,020 cycles; and that an offset frequency stability of plus or minus five cycles would be adequate. The above offset frequencies are the optimum offsets for a frame frequency of 29.97 cycles; they are even multiples (334 and 668) of frame frequency. For transmissions using a frame frequency of 30 cycles the optimum offsets are 10,020 cycles and 20,040 cycles. The stability requirements on the offset frequencies impose a relative stability on the picture carriers of plus or minus one part per hundred million for the VHF channels. View full abstract»

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  • A Method to Prevent Image Orthicon Burn-In

    Publication Year: 1957 , Page(s): 15 - 18
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    A device will be described which reduces ``burn-in'' on an image orthicon tube by as much as 90 per cent. The device is relatively simple and consists of a mechanism to oscillate slowly the lens board of a television camera at a very slow rate. Electrical cancellation of the resulting horizontal motion is accomplished by simple modification to the horizontal centering circuit of the camera. This device should allow a television station to get much longer life out of certain I. O. tubes and, just as important, to eliminate objectionable burn-in to the television viewer. View full abstract»

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  • The Use of A Mobile Television Monitoring Unit in an Enforcement Program

    Publication Year: 1957 , Page(s): 19 - 22
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    The Mobile Television Monitoring Unit operated by the Federal Communications Commission at the present time is being used as an instrument of co-operative enforcement. Discrepancies are called to the attention of the station's technical people, working with them in a positive effort to improve the situation with the mutual goal of providing better TV service for the general public. TV station inspection is combined with technical monitoring observations and cooperative corrective action has usually been taken when discrepancies have been noted. View full abstract»

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  • Measurement of Service Area for Television Broadcasting

    Publication Year: 1957 , Page(s): 23 - 30
    Cited by:  Papers (3)
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    It is proposed that the present definition of television service in terms of iso-probability contours be abandoned. A new definition of service area, first proposed by Norton and Gainen in 1950, is recommended in its place. This provides a much more useful measure of service and makes the estimating techniques more tractable. View full abstract»

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  • Sawtooth Testing of Audio Amplifiers

    Publication Year: 1957 , Page(s): 31 - 34
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    A sawtooth wave contains all harmonics, and a single oscilloscope picture shows three things about an audio amplifier; flatness of frequency response, transient stability, overload. View full abstract»

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  • A Magnetic Tape Recording System for Video Signals

    Publication Year: 1957 , Page(s): 35 - 39
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  • Emergency Standby Facilities for the Aural Television Transmitter

    Publication Year: 1957 , Page(s): 40 - 45
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    This paper presents a simple method for using the visual carrier of a television broadcast station for the purposes of transmitting both the aural and visual signals. The method is intended for use during emergency operation when the sound portion of the TV transmitter is ``off the air'' and the visual portion of the transmitter is in working order. This system is not recommended as a substitute for a standby transmitter. While various methods of transmitting the sound on the picture carrier are known, a simple and economical method of multiplexing is desirable for a TV broadcasting station. Consideration was given to a system which would require no adjustment of the main visual transmitter should the normal sound transmitter fail. The signal to noise ratio of the multiplexing system to be described is not as favorable as the conventional method of transmission. View full abstract»

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  • An Economical Guide to Station Planning

    Publication Year: 1957 , Page(s): 46 - 50
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  • History of the Directional Antenna in the Standard Broadcast Band for Purpose of Protecting Service Area of Distant Stations

    Publication Year: 1957 , Page(s): 51 - 55
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  • IRE Professional Group on Broadcast Transmission Systems Membership Directory (as of 20 November 1956)

    Publication Year: 1957 , Page(s): 56 - 62
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Aims & Scope

This Transactions ceased publication in 1958. The current retitled publication is IEEE Transactions on Broadcasting.

Full Aims & Scope