Notting Hill Carnival rubbish results in Jamaican music

Notting Hill Carnival has taken place every year in August since 1964, having been pioneering by immigrants from Trinidad and Tobago. It has its origins in efforts to improve race relations in 1960s London, following racial attacks and riots in the late 1950s. It is now estimated to be the second largest street carnival in the world, after the Rio Carnival in Brazil.

Caribbean culture is still central to the carnival’s ethos, which is why Red Stripe has chosen this event to begin its fantastic ‘Make with a Red Stripe’ cultural series. The first project, ‘Make Something from Nothing’ involved the collection of thousands of Red Stripe beer cans at the carnival in August 2011, a great recycling initiative in itself.

However, the cans were then put to good, if unusual use, by sound artist Yuri Suzuki and designer Matthew Kneebone. They used the recycled cans to create a towering sound sculpture in celebration of the DIY culture and Reggae music of Jamaica. The cans were arranged together in sections and taped up by a team of people, then arranged around a wooden structure to create a giant speaker.

The Make Something from Nothing sculpture was officially revealed at a launch party at Village Underground in November, with big names including Ben UFO, MC Chunky and the latest DJ talent in dubstep using this fantastic sculpture to entertain the crowd. Party-goers enjoyed Jamaican jerk chicken, rice and peas and, of course, a can or two of Red Stripe, while they listen to performers make great use the of the towering speaker system with Jamaican, dub and reggae influenced music.

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Basic Differences Between AM and FM

We need to mention a couple of other things before we leave the discussion of how radio works.  We’ve talked about AM and FM radio, but we haven’t explained the real difference.

In fact, there is a lot of difference — and not just a difference in the station numbers on your radio dial.

The first type of radio service — the one we’ve been talking about in the last couple of modules — was AM radio.

The term modulation refers to how sound is encoded on a radio wave called a carrier wave; or, more accurately, how the sound affects the carrier wave so that the original sound can later be detected by a radio receiver.

In the top-left of this drawing the RF energy (carrier wave) is not modulated by any sound.  There would be silence on your radio receiver.

Sound transmitted by an AM radio station affects the carrier wave by changing the amplitude (height) of the carrier wave, as shown on the left.

Unfortunately, this type of modulation is subject to static interference from such things as household appliances — and especially from lightening storms.

AM also limits the loud-to-soft range of sounds that can be reproduced (called dynamic range) and the high-to-low sound frequency range (called frequency response, to be explained below).

FM radio, which came along in the 1930s, uses a different approach than AM. It’s virtually immune to any type of external interference, it has a greater dynamic range, and it can handle sounds of higher and lower frequencies. This is why music, with its much greater frequency range than the human voice, sounds better on FM radio.

Note on the left that when the carrier wave of FM radio is modulated with sound that the distance between the waves, or the frequency of the carrier wave, changes.

Thus, AM radio works by changing the amplitude of the carrier wave and FM radio works by changing the frequency of the carrier wave.

Frequency Response

Frequency relates to the basic pitch of a sound — how high or low it is. A frequency of 20 Hz would sound like an extremely low-pitched note on a pipe organ — almost a rumble.

At the other end of the scale, 20,000 Hz would be the highest pitched sound that can be imagined, even higher than the highest note on a violin or piccolo.

As we’ve noted, frequency is measured in Hertz (Hz) or cycles per second (CPS). A person with exceptionally good hearing will be able to hear sounds from 20-20,000 Hz.

Since both ends of the 20-20,000Hz range represent rather extreme limits, the more common range used for FM radio and TV is from 50 to 15,000 Hz. (A typical AM radio signal does not cover this entire range.)

Although the 50-15,000 Hz doesn’t quite cover the full range that can be heard by people with good hearing, it covers almost all naturally occurring sounds.  Note in the drawing above that the ear does not hear all frequencies of sound at the same loudness, but a good microphone does.

The sound level or amplitude of sound in radio and TV stations is monitored and adjusted with the help of a volume units meter (VU meter) meter. One model is shown on the left.  Audio levels must be carefully controlled in broadcasting to keep noise and distortion from reducing the quality of sound.