The Office de Radiodiffusion-Télévision Française (ORTF) was the national agency charged, between 1964 and 1974, with providing public radio and television in France. 1964 was a leap year starting on Wednesday (link will take you to calendar). ... 1974 is a common year starting on Tuesday (click on link for calendar). ... Radio transmission diagram and electromagnetic waves Radio is a technology that allows the transmission of signals by modulation of electromagnetic waves with frequencies below those of light. ... An American family watching television in the 1950s. ... The French Republic or France (French: République française or France) is a country whose metropolitan territory is located in western Europe, and which is further made up of a collection of overseas islands and territories located in other continents. ...

In France, the public monopoly on broadcasting was established in 1945 when the Radiodiffusion française (RDF) was formed.

From the beginning, the public broadcaster experienced fierce competition from the "peripheral stations": French-speaking stations aimed at the French public but transmitting on long wave from neighbouring countries, such as Radio Monte Carlo (RMC) from Monaco, Radio Luxembourg / RTL from Luxembourg, and Europe 1 from Germany (exceptionally, in 1974, RMC was allowed to set up a transmitter on French territory). Longwave radio frequencies are those below 500 kHz, which correspond to wavelengths longer than 600 meters. ... The Principality of Monaco or Monaco (French: Principauté de Monaco or Monaco; Monegasque: Munegu or Principatu de Munegu) is a city state and the second-smallest country in the world, wedged in between the Mediterranean Sea and France along the French Riviera or Côte dAzur (The Blue Coast). ... RTL Group is Europes largest TV, radio and production company. ... The Grand Duchy of Luxembourg is a small landlocked state in the north-west of the continental European Union, bordered by France, Germany and Belgium. ... 1974 is a common year starting on Tuesday (click on link for calendar). ...

RDF was renamed Radiodiffusion Télévision Française (RTF) in 1949 and ORTF in 1964.

On August 8 1974, the ORTF was split into 7 institutions: August 8 is the 220th day of the year in the Gregorian Calendar (221st in leap years), with 145 days remaining. ...

• TF1 (later to be privatized - in 1987)
• Antenne 2
• FR3
• SFP - Société Française de Production (programme production)
• INA - Institut National de l'Audiovisuel (archives)
• TDF - Télédiffusion de France (transmission)
• Radio France - French national and international radio

TF1 is a private French TV network, controlled by the Bouygues group. ... France 2 is the largest French public TV network. ... France 3 is the second largest French public TV network, part of the France Télévisions group also comprizing France 2, France 5 and RFO. It is made up of regional television stations and the program is slightly different depending on the broadcasting region, with only the national news...

ORTF stereo microphone system

Around the year 1960 sound engineers of the French broadcast (ORTF) found by a number of practical attempts a stereo main microphone system, which results in a quite even distribution of the phantom sources (hearing event direction) on the stereo loudspeaker base, with two small cardiod characteristic microphones, recording angle of the microphone system of ± 48° = 96°.
This system got empirical an axle angle of α = ± 55° = 110° and a microphone distance (microphone basis) of a = 17 cm.
Here are frequency-independent level differences effective and time of arrival differences working together in the same direction as interchannel signals (loudspeaker signals). The engineers did not want to think of a human ear distance, because a useful microphone system for a set of stereo loudspeakers should be developed. This recording technology is called mixed stereo or equivalence stereo. Usually this special microphone system must be built up from two single small diaphragm microphones. One should not use double diaphragm microphones because of the produced unbalanced directional characteristics and the larger phase responses. Even if it appears advisable to experiment with the two parameters axle angle and microphone basis to which there are practical microphone mounting devices, a firmly installed ORTF microphone set is available. A microphone with a cord A microphone, sometimes called a mic (pronounced mike), is a device that converts sound into an electrical signal. ...