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Audio Signal Processing

Carrier-recovery-method-and-apparatus-having-an-adjustable-response-time-determined-by-carrier-signal-parameters

Work-clamping unit for use in machine tools

OF THE INVENTION Referring to FIGS. 1 and 2, a drilling machine (M) includes a horizontal table 1 ...

Method of transfer function generation and active noise cancellation in a vibrating system

I claim: 1. A method for the active cancellation of an incident vibration field (N(i.omega.)) ...

Method and apparatus for monitoring a pulse-code modulated data transmission

OF THE DRAWINGS The invention will now be described, by way of example, with reference to FIGS. 1 ...

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Particular and preferred aspects of the invention are set out in the accompanying independent and ...

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In order to attain the object, an inventive pseudorandom noise code generator is characterized in ...

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Referring to the figures, the speak portion 1 and microphone portion 2 are connected by a handle 3 ...

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It has now been found, according to this invention, that an improved refractory calcium aluminate ...

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We claim: 1. Apparatus for producing uniform light pulses comprising: source means for providing ...

Higher power semiconductor radiating mirror laser

Referring now specifically to FIG. 1, there is shown an active element 10 of the type preferrably ...

Electrode holder for electric arc furnaces

OF THE DRAWINGS FIG. 1 is a schematic illustration of the basic structure of a combination ...

Carrier recovery method and apparatus having an adjustable response time determined by carrier signal parameters

Details

Inventors: Cahill, Stephen V.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Safourek; Benedict V.
Assistant Examiner:
Attorney, Agent or Firm: Kaschke; Kevin D., Hackbart; Rolland R., Fisher; John A.

A communications receiver (103) comprising a carrier recovery apparatus having an adjustable response time loop filter (123) responsive to carrier signal parameters determined by a signal processor (141) is disclosed. Signal reception under fading conditions is improved by detecting the received signal parameters in an energy level determinator (207), a rate of change of energy level determinator (209) and a look-up table value (221) corresponding to a position of TDMA time clock (219).

DETAILED DESCRIPTION A demodulator circuit demodulates an input signal having a varying amplitude and phase.
The demodulator circuit includes phase tracking means having a predetermined response time for tracking the phase of the input signal.
The demodulator circuit detects a rate of change of the amplitude of the input signal; and varies the predetermined response time of the phase tracking means responsive to the detected rate of change of the amplitude of the input signal.
When the input signal includes a contiguous series of data bursts, the demodulator circuit determines the position of the data bursts with respect to time; and varies the predetermined response time of the phase tracking means responsive to the determined position of the data bursts with respect to time.

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