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The tone frequencies, are selected such that harmonics and intermodulation products will not cause an unreliable signal. No frequency is a multiple of another, the difference between any two frequencies does not equal any of the frequencies, and the sum of any two frequencies does not equal any of the frequencies.
What else can I help you with?
What types of diodes are used in high frequencies?
Two types used at microwave frequencies are gunn and PIN diodes.
What is the use of AT89S52 in DTMF based industrial aplliances control system?
AT89S52 is a microcontroller based on the Intel 8051 architecture and features. Concerning your question, AT89S52 is the heart of most project involving Dual Tone Multi Frequency (DTMF), that is to say it is the controller IC used in such project.
Why Two 33pF capacitors are used with crystal oscillator?
c1 and c2 capacitors with crystal eliminates the Harmonics(Unwanted frequencies) .
What are the disadvantages of using dtmf in home automation systems?
it does not have any feed back system
How IC MT8807 works as a dtmf decoder?
I assumed thats what its designed to be. See the datasheet on usage.
What is the difference in Normal and Long DTMF Tones?
DTMF (Dual-Tone Multi-Frequency) tones are used in telecommunication signaling. Normal DTMF tones consist of a combination of two specific frequencies for each key pressed, which are typically 697 Hz, 770 Hz, 852 Hz, or 941 Hz for the low frequencies, and 1209 Hz, 1336 Hz, 1477 Hz, or 1633 Hz for the high frequencies. Long DTMF tones, on the other hand, are extended versions of these tones, lasting longer than standard tones, which can enhance detection accuracy in noisy environments or during certain applications. The primary difference lies in their duration and potential application scenarios.
What types of diodes are used in high frequencies?
Two types used at microwave frequencies are gunn and PIN diodes.
What is basic principle of mobile controlled robot?
basic operation of mobile controlled lies with the functioning of DTMF and L293D driver ic. one mobile phone is used to send DTMF tones to Rx mobile phone and DTMF decoder ic is used to decode the dtmf tones and it sends information to to micro controller which produces response according to program and gives control to l293d driver ic.
What is DTMF How DTMF is used What are the advantages of DTMF?
Advantages:1. Effective control of home appliances.2. Home automation using mobile phone.3. Increases power efficiency.4. Increases appliances lifetime.5. Power wastage is reduced.
What is DTMF?
DTMF means Dual Tone Multi Frequency this is every key on your phone key pad, each key generates two tones over top of each other hence the Dual Tone of DTMF. This also applied to touch tone telephones that are hardwired in homes and businesses, they also use DTMF keying.
What is the duty of DTMF board in Radio Transceivers?
DTMF board is used to enable or disable options on a repeater or a radio system. They are also used for phone patch (telephonic relay) if the repeater has an interconnect capability. DTMF also serves as an Automatic Number Identification system, or ANI. In handheld and vehicle mounted units the DTMF board can transmit the unit's identifier before or after the unit transmits, or both. This can come in handy for identifying who is talking in larger county 911 systems, or for any system with a large number of units, but can be used regardless of the size of a given system.
Is Nokia 1680 a dtmf mobile?
yes,any mobile 2day operates on dtmf tech. and sometimes call it as touchtone tech.,.
What is the meaning of DTMF decoder?
mutifrequence signal r given to input it select 2 i.e two frequence signal
Frequency and cumulative frequency are two types of what?
Frequency and cumulative frequency are two types of frequency distributions. These are frequency tables that show statistical data for different types of frequencies that include absolute, relative, and cumulative frequencies. There are mathematical formulas used to calculate these frequencies.
What are two types of cell phones used world wide and at what frequencies do they operate?
Nokia and samsung
How do you deactivate dtmf in nokia 5800 phones?
not possible !
When should relative frequencies be used when comparing two data sets?
When comparing large data sets.
