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Pulse-code modulation (PCM) is a method used to digitally represent analog signals. It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled at uniform intervals, and each sample is quantized to the nearest value ...
- Low Pass Filter
- Sampler
- Quantizer
- Encoder
- Regenerative Repeater
- Decoder
- Reconstruction Filter
This filter eliminates the high frequency components present in the input analog signal which is greater than the highest frequency of the message signal, to avoid aliasing of the message signal.
This is the technique which helps to collect the sample data at instantaneous values of message signal, so as to reconstruct the original signal. The sampling rate must be greater than twice the highest frequency component Wof the message signal, in accordance with the sampling theorem.
Quantizing is a process of reducing the excessive bits and confining the data. The sampled output when given to Quantizer, reduces the redundant bits and compresses the value.
The digitization of analog signal is done by the encoder. It designates each quantized level by a binary code. The sampling done here is the sample-and-hold process. These three sections LPF,Sampler,andQuantizerLPF,Sampler,andQuantizerwill act as an analog to digital converter. Encoding minimizes the bandwidth used.
This section increases the signal strength. The output of the channel also has one regenerative repeater circuit, to compensate the signal loss and reconstruct the signal, and also to increase its strength.
The decoder circuit decodes the pulse coded waveform to reproduce the original signal. This circuit acts as the demodulator.
After the digital-to-analog conversion is done by the regenerative circuit and the decoder, a low-pass filter is employed, called as the reconstruction filter to get back the original signal. Hence, the Pulse Code Modulator circuit digitizes the given analog signal, codes it and samples it, and then transmits it in an analog form. This whole proces...
Pulse code modulation increases the transmission bandwidth. A PCM system is somewhat more complex than another system. Thus from the above discussion, we can conclude that a PCM system, transmits data in a coded format, that ensures secured transmission.
Pulse Code Modulation techniques are used to produce a series of numbers or digits in binary form. Hence this process is called digital modulation. The amplitude at that particular time of the signal sample is indicated by the binary codes. In the PCM process, a sequence of coded pulses indicates the message signal.
- The decoder helps to decode the pulse coded waveform to reproduce the original signal.
- Differential pulse code modulation (DPCM) Adaptive differential pulse code modulation (ADPCM)
- Regenerative Repeater.
- Pulse Amplitude modulation (PAM) Pulse width modulation (PWM) Pulse code modulation (PCM)
- Message signal.
Jun 7, 2024 · June 7, 2024. By JOSNA. Pulse-code Modulation (PCM) is a fundamental concept in audio technology, revolutionizing how we encode, transmit, and store audio signals. It involves converting continuous analog audio into a digital format by taking discrete samples of the signal’s amplitude at regular intervals.
Nov 29, 2023 · Pulse Code Modulation is a method used to digitally represent sampled analog signals. It is the standard form for digital audio in computers, CDs, digital telephony, and other digital audio applications. In PCM, an analog signal is sampled at regular intervals and quantized to the nearest value within a range.
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Aug 24, 2023 · Pulse Code Modulation (PCM) is defined as the conversion of sampled analog signals into digital signals which are in the form of a series of ‘on’ or ‘off’ amplitudes represented as Binary 0 and 1. The. Pulse Code Modulation consists of three steps, which are sampling, quantization and coding. As seen in the above image, an input analog ...
