Microprocessor data modem

TL;DR: In this article, a dual speed, full duplex modem for transmitting and receiving data on a dial-access telephone line includes a signal processor for storing samples corresponding to a mu-law compressed sinusoidal waveform, for selecting samples at intervals determined by the modem operating mode to synthesize a signal for modulating by data for transmission, and for autocorrelating a received signal at a frequency determined by operation mode to recover data from the received signal.

TL;DR: In this article, a modulator and a demodulator are used for converting a bit stream into a phase modulated intermediate frequency (IF) signal, with the symbols in the modulator section being phase-modulated and then digitally filtered to provide a filtered signal that, when converted into an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviates therefrom in accordance with the value of the phase modulating symbol, the analog signal then being filtered and passed to a mixer for up conversion to an IF signal.

TL;DR: In this paper, a full duplex, synchronous data set is presented, which includes a primary signal processing circuitry which generates a modulated transmit data signal in response to serial data from a terminal interface.

TL;DR: In this paper, a low cost, multipurpose digital IC is used as the basic building block in establishing a network communication system over a desired communication link, which can function as an addressable microcomputer interface between the network line and a remotely located microcomputer which may, for example, comprise any microprocessor based controlled product.

TL;DR: This paper describes the application of a commercially available microprocessor to a flexible data transmitter and data receiver for high-speed data modems.

TL;DR: In this article, a means and method for correcting for the effects of amplitude and phase jitter, in the presence of noise on quadrature signals transmitted over a channel at regular intervals as quadratures pairs, as received are measured.

TL;DR: In this article, a receiver for amplitude-modulated quadrature carrier signals which contain data is presented, and the operation of a local oscillator, which connects to the demodulators, or decoder which retains the data, is controlled.

TL;DR: In this article, a transversal filter receives and filters the baseband data signal and the thus filtered data signal is compensated for its dynamic distortion by a compensation network, where the error signal is separated into a steady state component and a dynamic component.