Title:
NOISE SHAPING CIRCUIT
Document Type and Number:
Japanese Patent JP3225644
Kind Code:
B2
Abstract:
PURPOSE: To prevent the occurrence of hunting phenomenon based upon a limit cycle by detecting that an input signal becomes a DC value (including '0') and setting up a value fed back to a quantizer to '0'.
CONSTITUTION: An input signal from an input terminal 11 is sent to a DC detector 17 and whether the input signal is a DC value including '0' or not is detected. When the input signal is a DC value including '0', all coefficeint values outputted from a noise filter 16 are controlled by a control signal outputted from a DC detector 17 so as to be switched to '0', so that a feedback value from the filter 16 to an adder (subtractor) 12 becomes '0'. When noise feedback value to a requantizer 13 becomes '0', an n-bit input signal from an input terminal 11 is extracted from an output terminal 14 after executing only cut-back to m bits. Consequently the occurrence of a hunting phenomenon can be prevented.
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Inventors:
Toru Sugihara
Application Number:
JP31652092A
Publication Date:
November 05, 2001
Filing Date:
October 31, 1992
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H03M7/36; G11B20/10; H03H17/02; H03H17/04; H03H21/00; H03M3/02; H03M7/00; H04B14/04; (IPC1-7): H03M3/02; H03H17/02
Domestic Patent References:
| JP5970308A | ||||
| JP250508A | ||||
| JP2228117A |
Attorney, Agent or Firm:
Akira Koike (2 outside)
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