Abstract In a circuit for regenerating the clock pulses of a PCM signal and including a phase control loop composed of a phase detector, a first lowpass filter and a controlled oscillator producing a control voltage which is applied as a control voltage to the phase detector, the regeneration of clock pulses is improved by also providing a quotient former having a first input connected to the output of the low pass filter and an output connected to the oscillator, and a second low pass filter having the same transmission characteristic as the first low pass filter and connected between the signal input of the phase detector and a second input of the quotient former. These added components cooperate with the other components of the circuit to produce a regenerated clock pulse which is free of phase fluctuations due to frequency and amplitude fluctuations in the received signal.
In a circuit for regenerating the clock pulses of a PCM signal with the aid of a phase control loop including a phase detector receiving a signal to be regenerated at a first input thereof, a first lowpass filter connected in series with the detector, and a cotrolled oscillator whose output is connected to a second input of the phase detector so that the output voltage from the oscillator serves as the control voltage for the phase detector, the improvement comprising: a quotient former having a first input connected to said first lowpass filter and an output connected to said controlled oscillator; and a second lowpass filter having the same transmission characteristic as said first filter and having an input connected to the input of said phase detector and an output connected to a second input of said quotient former, whereby said quotient former receives the voltage at the first input of said detector and the output of said oscillator presents a regenerated signal which is free of phase fluctuations due to frequency and amplitude fluctuations in the signal applied to the input of said detector.
Claim 2
Dependent Claim
186 words
In a circuit for regenerating the clock pulses of a PCM signal with the aid of a phase control loop including a phase detector receiving a signal to be regenerated at a first input thereof, a first lowpass filter connected in series with the detector, and a cotrolled oscillator whose output is connected to a second input of the phase detector so that the output voltage from the oscillator serves as the control voltage for the phase detector, the improvement comprising: a quotient former having a first input connected to said first lowpass filter and an output connected to said controlled oscillator; and a second lowpass filter having the same transmission characteristic as said first filter and having an input connected to the input of said phase detector and an output connected to a second input of said quotient former, whereby said quotient former receives the voltage at the first input of said detector and the output of said oscillator presents a regenerated signal which is free of phase fluctuations due to frequency and amplitude fluctuations in the signal applied to the input of said detector.