Analog and digital signal apparatus
First Claim
Patent Images
1. An analog to digital conversion system comprising:
- analog to digital converter means having characteristics that adapt to an applied signal, said converter means including means for generating a control signal derived from said applied signal for controlling said characteristics, andfrequency dependent variable response means for processing a signal prior to its application to said converter means, said variable response means having the shape of its response characteristic varying in response to said control signal.
1 Assignment
0 Petitions
Accused Products
Abstract
In order to reduce the effect of modulation of the quantizing error (noise) by the signal in an adaptive digital audio system and to increase the dynamic range of the system, the adaptive analog to digital converter is preceded by a frequency dependent network that changes the shape of its characteristic in response to a control signal. The control signal is derived from the variable scaling factor in the adaptive converter. After transmission via a transmission channel or record/playback process, complementary operations are performed by a digital to analog converter followed by a further frequency dependent variable response network.
86 Citations
26 Claims
-
1. An analog to digital conversion system comprising:
-
analog to digital converter means having characteristics that adapt to an applied signal, said converter means including means for generating a control signal derived from said applied signal for controlling said characteristics, and frequency dependent variable response means for processing a signal prior to its application to said converter means, said variable response means having the shape of its response characteristic varying in response to said control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. A digital to analog conversion system receiving signals digitized by an adaptive analog to digital converter in which a control signal was generated to control the adaption, comprising:
-
digital to analog converter means receiving said digitized signals for converting said signals to analog form, said converter means including means for regenerating said control signal, and frequency dependent variable response means for processing said analog signals, said variable response means having characteristics varying in response to said control signal.
-
Specification