| US 7,592,941 B2 | ||
| Signal processing apparatus and signal processing method | ||
| Kazunobu Ohkuri, Kanagawa (Japan); Kohei Asada, Kanagawa (Japan); and Ayataka Nishio, Kanagawa (Japan) | ||
| Assigned to Sony Corporation, Tokyo (Japan) | ||
| Filed on Dec. 28, 2007, as Appl. No. 11/966,168. | ||
| Claims priority of application No. 2007-025920 (JP), filed on Feb. 05, 2007. | ||
| Prior Publication US 2008/0186218 A1, Aug. 07, 2008 | ||
| Int. Cl. H03M 1/12 (2006.01) | ||
| U.S. Cl. 341—155 [341/143] | 19 Claims |
| 1. A signal processing apparatus comprising:
analog-to-digital conversion means for performing a first delta sigma modulation process of generating a digital signal having
a predetermined sampling frequency and a predetermined quantization bit rate of one or more bits based on an input analog
signal;
signal processing means including a digital filter to allow a delay time between input and output to be restricted within
a predetermined range and having a predetermined characteristic for outputting a digital signal having a sampling frequency
of n×Fs where n is a natural number and Fs is a predetermined reference sampling frequency and a predetermined quantization
bit rate of a bits where a is a natural number greater than one based on the digital signal generated by said analog-to-digital
conversion means; and
digital-to-analog conversion means including a part for performing a second delta sigma modulation process for outputting
a digital signal having a sampling frequency of n×Fs and a predetermined quantization bit rate of b bits where b is a natural
number greater than zero and less than a based on a digital signal outputted from said signal processing means.
|