James H. Morris 57 ABSTRACT The invention relates to a device for identifying a predeter
mined sequence of signals arriving on a modem, the sequence having a frequency …

In a modem apparatus including a modem circuit, opera tively connected to a computer and
a communication line, a ringing signal detector detects a ringing signal received through the …

US4674103A - Method and arrangement for detecting the presence of a training signal in a
modem receiver - Google Patents US4674103A - Method and arrangement for detecting the …

In modem apparatus having receiver circuitry which demodulates a received carrier into a
sequence of received signals and decodes each signal into a signal point drawn from a …

A method of determining the data rate of signals received on a communication line is
disclosed. The method analyzes the training signals which normally precede each data …

The present invention relates to method and apparatus for judging a timing phase of a
modem which is used in data communication for judging a timing phase from a reception …

57 ABSTRACT A method and apparatus for detecting an escape sequence to cause a
modem to switch from a data transmission mode to a command mode. The escape …

Apparatus, and a related method, for fast carrier acqui sition in a modem. The apparatus
includes circuitry to speed carrier acquisition by the determination of which of two alternate …

[57] ABSTRACT A modem for receiving data sent from a remote device over a
communication channel by using a single carrier modulated signal, the modem including a …

A detector of the presence of a transmission in a modem, including a circuit for determining
the absolute value of a receive signal, a first averaging block of the absolute value and two …