Telephony and telegraphy, Telephone schematics, Telephone circuits, Telephone sounds

Electromagnetic telegraph a technical history of the 19th-century electromagnetic telegraph, with special reference to the origin and variey of the alphabets, or codes, that were used

Fax technology facsimile (fax) technology, the transmission of images over a telephone line

Morse code

Morse code designed to help you learn and practice Morse Code

Morse code and phonetic alphabets Morse code translators and listings of the Morse code and of various phonetic alphabets

Morse code practice page

Telegrafische codes in Dutch

Telegrafische codes van Belgische spoorwegstations in Dutch

Telegraphy dedicated to the study of all aspects of Morse telegraphy

Telegraphy a tip

Telephone schematics - vintage telephone

Antique phones from the 1920's to 1970's

Bell telephone schematic this is part of Bob's telephone file many telephone circuit diagrams

Old telephones and how to repair them

Sound recording research at Bell Labs

Telephone, Telephone technical info

Telephone schematics and more

Telephone audio signal processing

A-law algorithm an a-law algorithm is a standard companding algorithm, used in European digital communications systems

A-Law and mu-Law companding implementations pdf file

Audio processing pdf file

Audio signal processing in advanced cellular phones

Cellular & PCS technology ppt file

Code division multiple access CDMA

Digital Transmission of Analog Signals Digital Transmission of Analog Signals, Analog Pulse Modulation, pulse amplitude modulation (PAM), pulse width modulation (PWM) and pulse position modulation (PPM), sampling process, Digital Pulse Modulation, Pulse code modulation (PCM) and delta modulation (DM), Pulse Code Modulation, PCM Channel Banks, CCITT µ-Law, CCITT A-Law, PCM Transmission, pdf file

FDMA Frequency Division Multiple Access

Modulation and demodulation pdf file

Mu-law algorithm a mu-law algorithm (μ-law) is a standard analog signal compression or companding algorithm, used in digital communications systems of the North American and Japanese digital hierarchies

Mu-Law companding a companding operation compresses dynamic range on encode and expands dynamic range on decode

PCM Pulse Code Modulation, click left on tutorials, scroll down, voice coding algorithms, Educypedia

Pulse code modulation PCM is a Time-Domain Waveform coding method, an analog signal is sampled at a rate of 8000 times per second, Pulse Code Modulation

Pulse code modulation Pulse Code Modulation. PCM is a Time-Domain Waveform coding method and is defined within CCITT G.711

Quantization Quantization

Signal quantization and compression click on laboratory for an interactive experiment

TDMA Time Division Multiple Access (TDMA) is a multiple access technique used by several cellular communication systems

TDMA Time Division Multiple Access (TDMA)

TDMA Time Division Multiple Access (TDMA), pdf file

VOICE DIGITIZATION AND VOICE/DATA INTEGRATION pdf file

Waveform Coding Techniques

µ-Law and A-Law Companding µ-Law and A-Law Companding, pdf file

µ-Law and A-Law Companding

Horizontaal

Telephone sounds and tones