Điện tử viễn thông DTVT2 nhom5 bai7 khotailieu

Drum machine Task 1) 2) I think a drum machine is an electronic musical instrument designed to imitate the sound of drums, cymbals or other percussion instruments Drum machines are most commonly associated with electronic music genres such as house music, but are also used in many other genres They are also used when session drummers are not available or if the production cannot afford the cost of a professional drummer I think Kick (bass) : It usually begins in the rhythm The drummer playing the bass drum using the pedal Pedals are attached to a hammer, or a stick to beat the drum And it is often called the kick drum (kick) for legs to beat drums Snare : This is a miniature version of the bass drum, but the drummer used drumstick to beat Snare drums mounted on the underside of the metal wire in the drum when hit The wire has the effect of making sonorous sound Closed hat and open hat : Open and closed hi-hat struck while the two cymbals are apart or together (open or closed), while pedal hi-hat refers to parts or notes played solely with the pedal used to strike the two cymbals Task a) b) c) d) When the drum is hit, it produces sound waves The sound waves reach the microphone and are converted into electrical signal The signal is sliced into many 'sample', 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 When the drum pad is pressed , the stored information is decoded and produces an electronic signal e) The signal is turned into sound waves though an amplifer, and the drum sound is heard TASK Text 1: The memory of a drum machine contains pre-recorded sounds from drum kits Digital sound stays true to the original Text 2: A microphone records sound by converting changes in air pressure to electrical signals The patterns of the sound waves are matched by the characteristics of the electrical signals Text 3: Signals are sampled regularly and often and stored in binary form Text 4: You don't need to play drums to make drum music you need only touch the switches which match the sounds you want Text 5: Pressing one of the buttons indicates to the processor the loudness and speed of the music to be played Text 6: You can't make a mistake with the beat because the drum machine corrects any errors by itself TASK With a drum machine, you can play any drum sound by pressing the right button You can create drum music without playing a drum What we hear as sound are changed in air pressure These are convertedto electrical signal by using a microphone The information contained in the drum machine memory consist of sample of these electrical signals 6 A drum machine contains recording of sound taken at measured intervals This process is called sampled The functions of a drum machine include the tune and pan Panning means the position of the drum in stereo Task 1) A burglar alarm is a system designed to detect intrusion – unauthorized entry – into a building or area Security alarms are used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders Systems range from small, self-contained noisemakers, to complicated, multi-area systems with computer monitoring and control 2) A clock timer is book a time to remind a certain job 3) A mercury switch (also known as a mercury tilt switch) is a switch which opens and closes an electrical circuit through a small amount of liquid mercury 4) A car phone is a mobile phone device specifically designed for and fitted into an automobile 5) A germanium diodes are a type that has been in use since the early days of radio and although they have been largely superceded by silicon signal diodes and integrated circuits, they may still be found as signal diodes in older radio circuits, where they are used It works in a similar way to a rectifier diode in a simple power supply; it passes one half of the incoming radio signal and blocks the other half The main differences being that the frequency of operation is much higher, also the voltages 6) 7) 8) used in a demodulator are tiny by comparison to a mains (line) power supply A ground wave is a surface wave that propagates close to the surface of the Earth A block diagram is a diagram of a system in which the principal parts or functions are represented by blocks connected by lines that show the relationships of the blocks.They are heavily used in engineering in hardware design, electronic design, software design, and process flow diagrams.Block diagrams are typically used for higher level, less detailed descriptions that are intended to clarify overall concepts without concern for the details of implementation Contrast this with the schematic diagrams and layout diagrams used in electrical engineering, which show the implementation details of electrical components and physical construction An assembly line is a manufacturing process (most of the time called a progressive assembly) in which parts (usually interchangeable parts) are added as the semi-finished assembly moves from workstation to work station where the parts are added in sequence until the final assembly is produced By mechanically moving the parts to the assembly work and moving the semi-finished assembly from work station to work station, a finished product can be assembled faster and with less labor than by having workers carry parts to a stationary piece for assembly 9) A fuseholders are devices for containing, protecting and mounting fuses Fuse holders come in two basic types, open or fully enclosed Open fuse holder types are fuse clips, fuse blocks, socket and plug-on cap varieties The fully enclosed variety may use a fuse carrier that is inserted into a holder or have other means to fully enclose the fuse 10) A wavemeter, device for determining the distance between successive wavefronts of equal phase along an electromagnetic wave A cellphone is a phone that can make and receive telephone calls over a radio link while moving around a wide geographic area It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network 12) Headphones (or "head-phones" in the early days of telephony and radio) are a pair of small loudspeakers that are designed to be held in place 11) close to a user's ears They are electroacoustic transducers, which convert an electrical signal to a corresponding sound in the user's ear 13) An ammeter is a measuring instrument used to measure the current in a circuit Electric currents are measured in amperes (A), hence the name Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters 14) A handset is a device that a user holds to the ear to hear the audio sound through the receiver Task 1) A sine wave an example of an analogue wave 2) A diagital signal have two levels 3) An ADC (analogue-to-digital converter) the analogue signals produced by transducers can be changed into digital signals 4) when an analogue signal is converted to a digital one, there is a process in which the analogue is always varying and the magnitudes of the samples are changed into digital values by an analogue-to-digital converter (ADC) )“binary digit” means a digit with two numbers DO TUẦN TRƯỚC BỌN EM GỬI MAIL NHƯNG DO LỖI NÊN BÀI RADIO TUẦN TRƯỚC CHƯA NỘP ĐƯỢC,NAY BỌN EM XIN GỘP CÙNG BÀI RADIO RADIO Vocabulary Appear …………………….xuất Actual ………………………thực tế Application ……………….ứng dụng Alphanumeric ……………ký tự Cost …………………………chi phí Circuit …………………… mạch điện Classify ……………………phân loại Digit ……………………… số Denote …………………… ký hiệu Electrolytic capacitor ….tụ hóa Ease ……………………….làm giảm bớt Electromagnetic wave … sóng điện từ Enable …………………… cho phép Electrolytic ……………… điện phân Exist ……………………… tồn Extreme ……………………cực Employ …………………….dùng Fact …………………………thực tế, thật Figure ………………………hình dung Finally ………………………cuối, sau Grey ……………………… xám General purpose ……….thường dùng Limited…………………… giới hạn Light emitting diode …… phát quang Letter ……………………… chữ Range …………………… dãy, loạt Resistor ……………………điện trở Impedance ……………… trở kháng Reflect …………………… phản ánh Range …………………… dãy, loạt Reach …………………… tới Relaxing the tolerance du vi sai số Preamp…………………… tiền khuếch đại Poor manufactory …… sản xuất tồi Power amp ……………… KĐ công suất Production ……………… công việc sx Position ………………… vị trí Produce ………………… sản xuất Positive terminal ……… cực dương Product …………………… sản phẩm Prefer …………………… thích Power rectifier diode … diode chỉnh lưu Particular ………………… riêng biệt Satisfactory …………… thỏa đáng Semiconductor ………… chất bán dẫn Seem ……………………… Tuning-in Study this diagram Name five things, other than radio which make use of electromagnetic waves Rays ……………………… tia Gamma rays …………… tia Gamma Ultraviolet rays………… tia cực tím Infra-red rays …………….tia hồng ngoại Radio waves …………… sóng phát Wavelength ………………bước sóng Short wavelength……….bước sóng ngắn Long wavelength ……….bước sóng dài Low frequency ………… tần số thấp High frequency ………….tần số cao Visible light ……………….ánh sáng nhìn thấy TASK2 Table Surface wave Frequencies (tần số) low frequency Travels (đường truyền) along the ground Range (khoảng cách) 1500km Difficulties (khó khăn) absorption by the ground TASK3 Table Sky wave Space wave Frequencies (tần số) below 300MHz VHF, UHF Travels (đường truyền) Task : TASK a transmitting aerial e surface wave d space wave c sky wave b receiving aerial Skywards and returned to earth by the ionosphere line of sight transmission a The switch is closed b Current flows through the primary of the transformer When the switch is closed, current flows through the primary of the Transformer a The radar signal strikes a plane b The radar signal is reflected On striking, The radar signal is reflected a A cell discharges quickly b A cell may become hot When discharging quickly, A cell may become hot a The TV receives signals from the remote control b The TV follows your instructions On receiving signals from the remote control, the TV follows your instructions a The radar receiver receives the reflected signal b The signal is compared with the transmitted signal On receiving the reflected signal, the signal is compared with the transmitted signal a You choose a course in electronics b You think carefully about your future When choosing a course in electronics, you think carefully about your future 7 a Microwave signals strike a high building b Microwave signals are deflected On striking a high building, microwave signals are deflected a You make a recording b You should ensure the recording levels are satisfactory When making a recording, you should ensure the recording levels are satisfactory a The alarm detects an intruder b The alarm triggers an audible warning On detecting an intruder, the alarm triggers an audible warning 10 a The remote control button is pressed b The television set changes channel On pressing remote control button, the television set changes channel Task : Verb Noun (component) Noun (property) Absorb Absorber Absorption Attenuate Attenuator Attenuation Communicate Communicator Communication Conduct Conductor Conductivity Induct Inductor Induction Modulate Modulator Modulation Reflect Reflector Reflection Resist Resistor Resistance TASK9 : AF audio frequency : RF Radio frequency : AM Amplitude modulated 4: FM Frequency modulated Task 10: Identify the wave Use these terms a : RF carier b: AF signal c: AM carrier d: FM carrier FM - Frequency modulated - High frequency ( 76 MHz – 130 Mhz) - Signals near AM - Amplitude modulated - Low frequency ( 30KHz – 16MHz) - Signals travel farther Task 11: Component Aerial Function Receiver weak RF signals RF tuner Modulater Rf carrier RF amplifier Amplifier RF wave Detector Detect RF signal AF amplifier Amplifier AF signal Loudspeaker Convert the audio signal into sound TASK 12 Radio waves are very popular in today's life It was used extensively in the field of communication today Here are all described block diagram of a simple radio receiver Diagram includes seven components Aerial is receiving antenna, receiver RF carrier is modulated and put into an amplifier Audio signal is separated from the carrier and into the audio signal amplifier and power amplifier signal audio signal after amplification was converted and emitted speakers 12 ... …………………… mạch điện Classify ……………………phân loại Digit ……………………… số Denote …………………… ký hiệu Electrolytic capacitor ….tụ hóa Ease ……………………….làm giảm bớt Electromagnetic wave … sóng điện từ Enable... ……………………….làm giảm bớt Electromagnetic wave … sóng điện từ Enable …………………… cho phép Electrolytic ……………… điện phân Exist ……………………… tồn Extreme ……………………cực Employ …………………….dùng Fact …………………………thực tế, thật... Light emitting diode …… phát quang Letter ……………………… chữ Range …………………… dãy, loạt Resistor ………………… điện trở Impedance ……………… trở kháng Reflect …………………… phản ánh Range …………………… dãy, loạt Reach ……………………