Timing recovery device in a receiver circuit for modems

A receiver circuit, in particular a receiver circuit for audio frequency modems, comprising:

• means for receiving and sampling an analog input signal representing digital data and for supplying a sampled analog signal in the form of complex samples, an adaptive equalizer having a transversal filter with a plurality of complex multiplier coefficients ordered relative to a usually central-position highest norm coefficient to generate symbols at a given symbol rate from the sampled analog signal, and a timing recovery device comprising first means responsive to displacement of at least one of said coefficients, said displacement being relative to said central position, to control an oscillator supplying a timing signal;
• characterized in that the timing recovery device comprises:
• the transversal filter of the adaptive equalizer, and an auxiliary transversal filter having a plurality of complex multiplier coefficients, at least some of these latter being equal to the coefficients of the adaptive equalizer at a given time during reception of the analog signal, said transversal and auxiliary transversal filters receiving complex samples to be equalized, in parallel, said coefficients of the auxiliary equalizer each having a norm which is kept constant;
• and
• a first calculator module connected to the outputs of the transversal filter of the adaptive equalizer and of the auxiliary transversal filter to supply a first value E which is representative of timing drift, and which controls said oscillator.