Nhóm 7: Nguyễn Bá Duy Dương Văn Hùng Đỗ Văn Sang Trần Minh Đức Nguyễn Khắc Ngân Vũ Văn Chinh Task 1: the drum machine has been recorded digitally The drum machine has been pre-recorded from the oiginal instruments Kick : the drum create sound by the kick of foot Snare : a ubiquitous percussion instrument known for its cylindrical shape and powerful, staccato sound Closed hat : Open hat : Task 2: c when the drum is hit, it produces sound waves e the sound waves reach the microphone and are converted into an electrical signal b the signal is sliced into many ‘samples’ each one a snapshot of the strength of the signal at one particular moment This information is converted into binary code and then stored in the machine’s memory a when the drum pad is pressed, the stored information is decode and produces an electronic signal d the signal is turned into sound waves through an amplifier, and the drum sound is heard Task 3: 1–e 2–a 3–b 4–c 5–d 6–f Task 4: You can create your own songs and rhythrms without ever touching a drum kit The machine's read-only memory stores sounds which have been prerecorded from the original instruments Instead of recording the sound waves continuously, a drum machine is programmed with sounds that have been sampled from the electrical signals produced by the microphne The signal is sliced into many ‘samples’ each one a snapshot of the strength of the signal at one particular moment The advantage of digital sound is that it has only two electrical conditions: on and off Sound recorded in this way remain accurate How hard you press and for how long tells the microprocessor how loud and at which tempo the sound The machine can also quantize, or shift the sounds being played, so that each is rhythmically perfect If you hit a note a little ahead or behind the beat, the machine will automatically place the drum hit rifht on the beat Task 5: With a drum machine, you can play any drum sound by pressing the right button You can create drum music withuot playing a drum What we hear as sound are changing in air pressure These are converted to electrical signal by using a microphone The information contained in the drum machine memory consists of sampling of these electrical signals A drum machine contains recording of sound taken at measured intervals This process is called sampling The funcions of a drum machine include panning and tunning Panning means the positioning of the drum sound in stereo Task 6 A burglar alarm = an alarm which warns of burglar A clock timer = the clock which make an appointment A mercury switch = a switch which contains mercury A car phone = a phone for use in car A germanium diode = a diode which contains germanium A ground wave = this travels along the groud, following the curvature of the earth’s surface A block diagram = A diagram which the principal parts or functions are represented by blocks connected by lines that show the relationships of the blocks A assembly line = a series of workers and machines in a factory A fuseholder = a fuse in a holder 10 A wavemeter = an instrument for measuring frequency 11.Headphones = a pair of small loudspeakers that are designed to be held in place close to a user's ears 12 A cellphones= mobilephones 13.An ammeter = an instrument for measuring current 14.A handset = On an old-fashioned wired telephone Task analogue waves a digital signal have two voltage levels, and An analog-to-digital converter (ADC) is a device that can be changed analogue signals into digital signals The samples of the original signals must be taken at successive interval of time the magnitudes of the samples are changed into digital values by the ADC Each binary digit used to show a binary value is know as a bit Th accuracy of conversion is limited by the number of binary bits esed by the ADC