公开(公告)号：US20070115953A1

公开(公告)日：2007-05-24

申请号：US11306895

申请日：2006-01-16

Applicant: Hsuan-Fan Chen ,  Chung Tsai

Inventor： Hsuan-Fan Chen ,  Chung Tsai

IPC: H04L12/50

CPC classification number: H03M1/1225 ,  H03M1/46 ,  H03M3/50

Abstract: A voice-recording apparatus and a voice-band audio CODEC apparatus derived therefrom are disclosed. The voice-recording apparatus includes a multiplexer, a successive approximation analog-to-digital converter (SAR-ADC); and a pulse code modulation code digital circuit (PCM code digital circuit). The multiplexer alternately outputs a left channel input signal and a right channel input signal in response to a first clock signal. The SAR-ADC is coupled to the multiplexer, takes a second clock signal as the operating frequency thereof and converts the left channel input signal and the right channel input signal from analog signal format into digital signal format. The PCM code digital circuit converts the output signal of the SAR-ADC from serial digital code into parallel digital code.

Abstract translation: 公开了一种语音记录设备和从其导出的语音带音频CODEC设备。 语音记录装置包括多路复用器，逐次逼近模数转换器（SAR-ADC）; 和脉冲码调制码数字电路（PCM码数字电路）。 复用器响应于第一时钟信号交替地输出左声道输入信号和右声道输入信号。 SAR-ADC耦合到多路复用器，取第二个时钟信号作为其工作频率，并将左声道输入信号和右声道输入信号从模拟信号格式转换为数字信号格式。 PCM代码数字电路将SAR-ADC的输出信号从串行数字代码转换为并行数字代码。

公开(公告)号：US07170439B1

公开(公告)日：2007-01-30

申请号：US11307007

申请日：2006-01-19

Applicant: Hsuan-Fan Chen

Inventor： Hsuan-Fan Chen

IPC: H03M1/12

CPC classification number: H03M1/1009 ,  H03M1/0678 ,  H03M1/468 ,  H03M1/804

Abstract: A self-calibration circuit for capacitance mismatch is provided. The circuit comprises a sample-and-hold (S/H) circuit, a comparator, and a switch control circuit. The S/H circuit comprises a compensation capacitor array, a target capacitor, and a reference capacitor. The S/H circuit provides an output voltage, wherein the output voltage is an operation result based on the capacitance of the target capacitor and the reference capacitor, and the equivalent capacitance of the compensation capacitor array. The comparator provides a comparison signal according to whether the output voltage of the S/H circuit is positive or negative. The switch control circuit controls the equivalent capacitance of the array according to the comparison signal such that the result of the target capacitance added to the equivalent capacitance of the array gradually approximates the reference capacitance with each cycle of a clock signal.

Abstract translation: 提供了一种用于电容失配的自校准电路。 电路包括采样保持（S / H）电路，比较器和开关控制电路。 S / H电路包括补偿电容器阵列，目标电容器和参考电容器。 S / H电路提供输出电压，其中输出电压是基于目标电容器和参考电容器的电容的运算结果以及补偿电容器阵列的等效电容。 比较器根据S / H电路的输出电压是正还是负，提供比较信号。 开关控制电路根据比较信号控制阵列的等效电容，使得添加到阵列的等效电容的目标电容的结果在时钟信号的每个周期逐渐接近参考电容。