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Simultaneous substitution

Simultaneous substitution is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Simultaneous substitution rather than just read about it. In short: Simultaneous substitution (also known as simsubbing or signal substitution) is a practice mandated by the Canadian Radio-television and Telecommunications Commission (CRTC) requiring broadcast distribution undertakings (BDUs) in Canada to distribute the signal of a local or regional over-the-air station in place of the signal of a foreign or non-local television station (typically one that is affiliated with a U.S…

Simultaneous substitution — main illustration
Simultaneous substitution — illustration

Key takeaways

  • Simultaneous substitution belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Simultaneous substitution to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Simultaneous substitution from memory before moving on to harder problems.

Reference excerpt

Simultaneous substitution (also known as simsubbing or signal substitution) is a practice mandated by the Canadian Radio-television and Telecommunications Commission (CRTC) requiring broadcast distribution undertakings (BDUs) in Canada to distribute the signal of a local or regional over-the-air station in place of the signal of a foreign or non-local television station (typically one that is affiliated with a U.S. commercial television network such as ABC, CBS, NBC, and Fox), when the two stations are broadcasting identical programming simultaneously. The CRTC first introduced the policy in 1972, and it is sometimes erroneously called "simulcasting", the name of a practice different from simultaneous substitution in that there is no signal replacement. According to the CRTC, the practice of simultaneous substitution is necessary "to protect the rights of broadcasters, to enable television stations to draw enough advertising revenue and to keep advertising money in the Canadian market". Canadian broadcast networks, which must request each and every substitution on an individual basis, have been criticized for exploiting the regulation and not investing enough money into Canadian content. The most prominent public criticism of simsubs has been centred around the Super Bowl—the championship game of the National Football League—which is well known for featuring high-profile commercials on its U.S. broadcast. In 2015, citing the ads as having become an "integral part" of the broadcast, the CRTC announced that it would implement a policy to prevent broadcasters from requesting simsubs for the game; it was officially implemented prior to Super Bowl LI in 2017. This has faced criticism over the change in policy from the game's Canadian rightsholder, CTV owner Bell Media; the company argued that it singled out a specific program for policy in violation of the Broadcasting Act, and devalued its rights to the league. Bell Media subsequently fought this policy in court, and it was overturned by the Supreme Court of Canada on December 19, 2019.

History During the 1950s, the Canadian Broadcasting Corporation (CBC) had a monopoly on television broadcasting in Canada (its first television station, CBFT, began operating in Montreal in 1952). In 1960, the Board of Broadcast Governors, the predecessor of the CRTC, began granting licences for commercial stations in order to provide an alternative to the CBC. These broadcasters began operating in 1961, and through international distributors, acquired the domestic broadcast rights to many American television programs. Since about 30% of the Canadian population – those who resided close enough to the Canada–US border – had access to over-the-air broadcast signals from networks based in both Canada and the United States, they could choose to watch American programs on either a Canadian or an American network. Many of these Canadians chose to watch the American network (either CBS, ABC or NBC) rather than the Canadian networks' broadcasts. Consequently, many Canadian broadcasters began broadcasting programs purchased from American-based broadcast networks before they aired on the American networks to attract more viewers and to earn money from domestic advertising, and some Canadian businesses that advertised on the domestic stations also purchased broadcast time on the American stations that were receivable in the same areas, although federal legislation was eventually passed that limited the tax-deductibility of these purchases. Several of the stations in smaller border markets in the United States openly targeted the larger cities in Canada by getting as close to the border as possible as border blasters. Examples include most of the stations in the Buffalo, New York television market, which targeted Toronto and the Golden Horseshoe region, and in the most extreme case, Pembina, North Dakota, station KCND-TV (channel 12), which was based in a town with fewer than 1,000 residents but made its money by targeting the much larger city of Winnipeg across the border to its north. When cable television began to proliferate across Canada, viewers far from the Canada–US border obtained clear access to American television services. By the early 1970s Canadians, who watched four hours a day of television on average, chose American channels up to two thirds of the time; only National Hockey League on television reliably drew Canadians to domestic channels. The domestic channels also heavily purchased American productions. When Canadian content regulations required them to broadcast a certain amount of domestic production, the channels scheduled American programs earlier in the evening, hoping that audiences would stay for the less popular Canadian programs. In 1972, in response to pressure from Canadian broadcasters, the CRTC introduced the simultaneous substitution regulation as a method to circumvent diminution of the value of Canadian networks' exclusive broadcast rights to American programs; within three years, KCND was effectively moved to Winnipeg and relicensed as CKND-TV. Through the 1990s, as direct-broadcast satellite television services gained popularity and then were granted licences in Canada, simultaneous substitution became a requirement on these as well. By the late 1990s and early 2000s, the simultaneous substitution regulation had reached its full potential, with Canadian broadcast networks telecasting nearly all of their American programming at the same time as the U.S. network's broadcasts to ensure maximum eligibility to request substitution.

Effects The high incidence of simultaneous substitution requests by privately owned Canadian television networks to draw advertising revenue has had profound effects on various spectrums, ranging from Canadian network schedules to portions of programming being lost due to mistimed substitutions.

… excerpt ends here. Continue reading the full article.

Illustrations

Simultaneous substitution: A partially transparent NBC logo is seen on the left. An opaque, grey CTV Two bug partially covering the NBC logo is seen on the right.
A partially transparent NBC logo is seen on the left. An opaque, grey CTV Two bug partially covering the NBC logo is seen on the right.

Worked examples

Example 1 — a first encounter with Simultaneous substitution

Start with the simplest possible case. Write down what Simultaneous substitution claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Simultaneous substitution before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Simultaneous substitution ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Simultaneous substitution

In research
Simultaneous substitution appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Simultaneous substitution in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Simultaneous substitution is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1972 establishments in Canada, Advertising in Canada, Broadcast law, so understanding it makes those chapters shorter.
In everyday life
Look for Simultaneous substitution outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Simultaneous substitution in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Simultaneous substitution means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Simultaneous substitution out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Simultaneous substitution in simple terms?

Simultaneous substitution (also known as simsubbing or signal substitution) is a practice mandated by the Canadian Radio-television and Telecommunications Commission (CRTC) requiring broadcast distribution undertakings (BDUs) in Canada to distribute the signal of a local or regional over-the-air st…

Why does Simultaneous substitution matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Simultaneous substitution?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Simultaneous substitution.

Tags

  • 1972 establishments in Canada
  • Advertising in Canada
  • Broadcast law
  • Cable television in Canada
  • Canada–United States relations
  • Canadian Radio-television and Telecommunications Commission
  • Telecommunications-related introductions in 1972
  • Television terminology

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