Analyzing And Testing Low Pass Filters For Anti Aliasing

An onboard TLV320AIC23 (coder/decoder) codec is high-performance stereo audio codec with highly integrated analog functionality which provides analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). Multibit sigma-delta technology with integrated oversampling digital interpolation filters is used in this onboard codec. It connects directly to a 12-MHz master clock. On the other hand, various data-transfer word length from 16 bits to 32 bits along with various sampling rates from 8 kHz to 96 kHz could be supported by this AIC23 codec. Besides, this TI AIC23 codec has stereo-line inputs and stereo-line output which makes this codec an ideal analog input/output (I/O) option for audio

Digital and Analog recording which both were foreign to me, I now have a better understanding of them both now. To help me understand them I use this saying “digital data" which means that a digital recording deals with data and "analog acoustic" and analog deals with recording acoustic recording into an electric sound. The more data on a digital recording the more data you have about the actual sound that was recorded. The digital recordings you can change whatever you want about them because they are dealing with data. Then the acoustic recording seems as if you are transferring the acoustic sound to an electric sound. The understanding that I have of an analog recording is it is the exact replica of what was previously recorded. There is not much you can do to change it.

All audio is recorded is analogue and needs to be converted to digital. In order to do this a technique known as sampling is used. Here is a picture of how sampling works. The red line is the original analogue audio. The gray blocks are each sample of the audio. The more samples there are the higher quality or more true to the original it will be.

To facilitate knowledge of this project, this summary contains a description of what all is entailed for the Voice Recorder Project. The purpose of this project is to replace the current antiquated recording system that is beyond its end of life. Included is a project charter which is an overview of what is entailed in the project. Next is the project scope and work breakdown structure (WBS), which breaks down the larger tasks into smaller tasks which are easier to comprehend and manage effectively (Markgraf, 2012). In addition, a

So, as you can see there are nine steps carried out in here. The first one is about taking our own voice signal and storing that in the database. So, this step is basically the most vital of all because we as human beings can distinguish and recognize each other’s voice. For ex. If four of us speak in a group we can easily distinguish who spoke first and who finished at the last. Now, for a computer to distinguish individual voice signals are not an easy task as everyone has their own frequency of speech. Therefore this analyzing of the voice signals is only possible by computing

CP3208 devices are successive approximation 12-bit ADC with on-board sample and hold circuitry. The MCP3204/3208 devices operate over a broad voltage range (2.7 V - 5.5 V). Low current design permits operation with typical standby and active currents of only 500 nA and 320 μA, respectively. Fig.3 shows the functional block diagram of MCP3208 ADC. Fig.3 Functional Block Diagram of MCP3208 ADC

Tone generator=A tone generator, also known as a signal generator, can be described in at least two contexts: electronic audio acoustics and equipment testing and setup, or informational signals, commonly associated with a telephone system. In each case, electrically generated audio pulses are sent to specific components. In the case of audio equipment testing, frequency response and sound evaluation are noted, and the acoustic properties of a studio or hall may be determined. With a telephone system, the dial tone, busy signal, and ring tone are the result of this pulsed tone generation.

As a result of The Beatles being the number one band in the world, they had access to the industries latest recording tools. Perhaps one of the most important recording tools used by the band in recording was automatic double tracking or ADT. This device allowed the band to flawlessly double any given sound. ADT was used mostly on vocals to enhance the sound of the singer. The Beatles also used an innovative tool known as the Dolby noise reduction system (Dolby NRS). This device reduced the build up of noise during the over dubbing process. Dolby NRS is still widely used in the field of music recording. In an effort to find a new sound, The Beatles cracked open an amplifier and put a fan inside. Just as talking into a fan distorts a voice, the band found that it has the same effect on an instrument. Many of the sounds were added onto the tracks randomly which makes the album virtually impossible to rerecord or perform live.

Advancements in Information Technology have now made it possible to restore hearing to the profoundly deaf by inserting a prosthetic device called the Bionic Ear (also known as the Cochlear Implant) in an individual’s inner ear. The Bionic Ear technology is an example of design and innovation combined with information processing, software design and development. Since it was first invented, technology advancements proceeded on a parallel track in terms of miniaturisation and increasing sophistication of this Bionic Ear technology. This particular technology operates by delivering electrical stimuli to the auditory nerve which then triggers auditory

Analog recording does have benefits over digital recording. One was mentioned in the previous paragraph. Analog recordings have a more natural sound. Nothing is taken out of the original recording; it is all there on the record in one natural flow. Another positive of the analog recording is that it is played on a turntable. With the turntable a person can choose among various components that will affect the overall sound. On a CD player a person can not switch the laser to get better sound, but on a turntable a person can upgrade the cartridge. The cartridge holds the needle which tracks the grooves in the record (Day 92). The better the cartridge the better the sound quality. Also, for

Many audio measurements are made using weighting curves that attempt to skew the results in favor of the way we actually hear. For example, the signal-to-noise ratio of a microphone preamp might be listed as 108 dB A-weighted, or sometimes just 108 dB(A). This means that the noise was filtered before measurement to exclude the extreme lows and highs to approximately the same degree our ears do at 40 phons. The rationale is that if we listen to the device at that level, then we will perceive the noise floor to be

Ultrasonic sensors are devices deployed to convert electrical energy into mechanical energy. Ultrasonic waves are longitudinal waves which move as a series of compressions and rarefactions across the direction of wave propagation through the medium [37]. In addition to distance measurement, they are also utilised in ultrasonic material testing to detect; air bubbles, cracks, and other defects in products, detection of object and position, ultrasonic mouse, etc [37].

A stream of data is written along the length of the tape until the end is reached, then the tape reverses and the next track is written beneath the first one (see Figure 7.18). This process continues until the track capacity of the tape has been reached. Digital linear tape (DLT) and Quarter Inch Cartridge (QIC) systems use serpentine recording with 50 or more tracks per tape.

Examples of implementation options with different ADC types are shown in Fig. 5. In these examples, a 5-bit conversion is applied with the same input signal and the same scenario: (1) In Row 1, since there are no previous rows, the prediction is not available, the conversion starts with the second step, which is a complete A/D conversion, (2) In Row 2, the first step prediction is successful, so in the second step, only a partial A/D conversion need to be performed. (3) In Row 3, the first step prediction is failed and thus a complete A/D conversion is performed.

Spy ear is the devices which converts low power audio signal to high power signal and gain. It can be used in Theaters , Concert halls, Lecture rooms, Trains, Court houses, Conference rooms, Embassies, Gaming facilities, Recording studios, Aircraft , railways ,bus station etc.With this sound amplifier, you can now hear things crystal clear that you could never hear before. Spy ear is very easy to use, just put the ear buds in your ears - aim the Spy Ear towards what you want to hear and things are heard crystal clear. Spy Ear has adjustable volume control, which amplifies sound up to 50 decibels. Spy ear is also great for watching TV late at night, while