The people lived in the urban areas wants to make their life luxurious with the use of more power for their home appliances. The power conservation is more important to reach the demand of the electrical power; there are several methods available for the conservation of electrical power. Every system is automated in order to face new challenges in the present day situation. Automated systems have less manual operations, so that the flexibility, reliabilities are high and accurate.
Hence every field prefers automated control systems. Especially in the field of electronics automated systems are doing better performance increasingly. The use of modern technologies is to achieve the power conservation not only through the proper design of respective devices and other parameters in the power system. Which uses Mobile technology that keeps monitoring of the various appliances, and will control the operation of these appliances with respect to the signal sent by the mobile. For utilization of appliances the new concept has been thought to manage them remotely by using mobile, which enables the user to remotely control switching of domestic appliances.
The mobile communications has become one of the driving forces of the digital revolution. Every day, millions of people are making phone calls by pressing a few buttons. Little is known about how one person's voice reaches the other person's phone that is thousands of miles away. Even less is known about the security measures and protection behind the system.
The complexity of the cell phone is increasing as people begin sending text messages and digital pictures to their friends and family. The cell phone is slowly turning into handheld computer. All the features and advancements in cell phone technology require a backbone to support it. The system has to provide security and the capability for growth to accommodate future enhancements. The main aim of our project is to operate our home appliances like lights and water pump from office or any other remote places.
So if we forgot to switch off the lights or other appliances while going out, it helps us to turn off the appliances with our cell phone.
Cell Phone based Device Control with Voice Acknowledgement
Cell phone works as the remote control for our home appliances. We can control the desire appliance by pressing the corresponding key. The system also gives us voice acknowledgement of the appliance status. In this project we use several numbers of integrated circuits, network elements such as diodes, rectifiers, filters, resisters, capacitors, etc.
These are explained in the corresponding chapters. The process of the whole project depends upon the functions of the switches and mobile keys. The functions of switches and mobile keys also explained in the corresponding chapters. Detailed tutorials are given on the site. See the below tutorials: We are going through a period of micro-electric revolution. For a common person, the role of electronics is limited to audio-visual gadgets like radio and television, but the truth is, today the growth of any industry like communication, control, instrumentation or computer, is depend upon electronics to a great extent.
And integrated circuits are electronics. The term IC reflects the capabilities of semiconductor industry to fabricate complex electronic circuit consisting of a large number of components on a single substrate.
Description
The IC is a miniature, low cost electronic circuit consisting of active and passive components that irreparably joined together on a single chip of silicon. Most of the components used in ICs are not similar to conventional components in appearance although they perform similar electrical functions. These circuits naturally offer a number of advantages over those made by interconnecting discrete components.
The monolithic circuit is ideal for applications where identical circuits are required in very large quantities and hence provides lowest per unit cost and higher order of reliability. Miniaturization and hence increased equipment density. Cost reduction due to batch processin. Matched devices, Increased operating speed. The APR device offers true single-chip voice recording, non-volatile storage, and Playback capability for 40 to 60 seconds. The device supports both random and sequential access of multiple messages.
Sample rates are user-selectable, allowing designers to customize their design for unique quality and storage time needs. Integrated output amplifier, microphone amplifier, and AGC circuits greatly simplify system design. The device is ideal for use in portable voice recorders, toys, and many other consumer and industrial applications.
This technology enables the APR device to reproduce voice signals in their natural form. It eliminates the need for encoding and compression, which often introduce distortion APR block diagram is included in order to describe the device's internal architecture. At the left hand side of the diagram are the analog inputs.
A differential microphone amplifier, including integrated AGC, is included on-chip for applications requiring use. The next block encountered by the input signal is the internal anti-aliasing filter. After anti-aliasing filtering is accomplished the signal is ready to be clocked into the memory array. These circuits are clocked by either the Internal Oscillator or an external clock source.
When playback is desired the previously stored recording is retrieved from memory, Low pass filtered, and amplified as shown on the right hand side of the diagram. Chip-wide management is accomplished through the device control block shown in the upper right hand corner. Message management is provided through the message control block represented in the lower center of the block diagram. More detail on actual device application can be found in the Sample application section.
More detail on sampling control can be found in the Sample Rate and Voice quality section. More detail on Message management and device control can be found in the Message Management section. Playback and record operations are managed by on-chip circuitry.
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There are several available messaging modes depending upon desired operation. These message modes determine message management style, message length, and external parts count. Therefore, the designer must select the appropriate operating mode before beginning the design. The device supports five message management modes. Random access mode with 2, 4, or 8 fixed-duration messages Tape mode, with multiple variable-duration messages, provides two options: Modes cannot be mixed. Switching of modes after the device has recorded an initial message is not recommended. If modes are switched after an initial recording has been made some unpredictable message fragments from the previous mode may remain present, and be audible on playback, in the new mode.
These fragments will disappear after a Record operation in the newly selected mode. Table 1 defines the decoding necessary to choose the desired mode. An important feature of the APR Message management capabilities is the ability to audibly prompt the user to change in the device's status through the use of "beeps" superimposed on the device's output. This feature is enabled by asserting a logic high level on the BE pin. Random access mode supports 2, 4, or 8 Message segments of fixed duration. As suggested recording or playback can be made randomly in any of the selected messages.
The length of each message segment is the total recording length available as defined by the selected sampling rate divided by the total number of segments enabled as decoded in Table3. Random access mode provides easy indexing to message segments. On power up, the device is ready to record or playback in any of the enabled message segments.
Cell Phone based Device Control with Voice Acknowledgement | EngineersGarage
You initiate recording by applying a low level on the message trigger pin that represents the message segment you intend to use. For a more thorough explanation of the functionality of device pins in different. When actual recording begins the device responds with a single beep if the BE pin is high to enable the beep tone at the speaker outputs to indicate that it has started recording.
Recording continues as long as the message pin stays low. The rising edge of the same message trigger pin during record stops the recording operation indicated with a single beep. If the message trigger pin is held low beyond the end of the maximum allocated duration, recording stops automatically indicated with two beeps , regardless of the state of the message trigger pin. The chip then enters low-power mode until the message trigger pin returns high. After the message trigger pin returns to high, the chip enters standby mode. Any subsequent high to low transition on the same message trigger pin will initiate recording from the beginning of the same message segment.
The entire previous message is then overwritten by the new message, regardless of the duration of the new message. Each memory cell can support voltage Ranges from 0 to levels. During playback the stored signals are retrieved from memory, smoothed to form a continuous signal, and then amplified before being fed to an external speaker. According to Shannon's sampling theorem, the highest possible frequency component Introduced to the input of a sampling system must be equal to or less than half the sampling frequency if aliasing errors are to be eliminated.
The APR automatically filters its input, based on the selected sampling frequency, to meet this requirement. Higher sampling rates increase the bandwidth and hence the voice quality, but they also use more memory cells for the same length of recording time.