公开(公告)号：ZA9811353B

公开(公告)日：2000-10-11

申请号：ZA9811353

申请日：1998-12-10

Applicant: QUALCOMM INC

Inventor： HEIMBIGNER WADE L ,  OLIVEIRA LOUIS D ,  IV JAMES A HUTCHISON

IPC: G10L19/16 ,  H03M1/18 ,  H03M ,  H03G ,  G10L

Abstract: An audio band processor and a method and circuit for controlling its gain. The audio band processor comprises a first variable gain amplifier for receiving an analog audio signal; an analog to digital converter for converting the analog audio signal to a digital audio signal; and an interface circuit for encoding the digital audio signal. The interface circuit also arranges the digital audio signal into a sequence of encoded transmit frames, and receives a sequence of encoded receive frames, each receive frame comprising a predetermined number of encoded digital audio signal data bits and a predetermined number of digital gain control bits. The interface circuit also adjusts a gain level of the first variable gain amplifier in response to the digital gain control bits. In another embodiment, the audio band processor further comprises a second variable gain amplifier, and the interface circuit adjusts a gain level of the second variable gain amplifier in response to the digital gain control bits.

公开(公告)号：NO20002955D0

公开(公告)日：2000-06-09

申请号：NO20002955

申请日：2000-06-09

Applicant: QUALCOMM INC

Inventor： HEIMBIGNER WADE LYLE ,  HUTCHISON IV JAMES A ,  OLIVEIRA LOUIS D

IPC: G10L19/16 ,  H03M1/18 ,  H03M

Abstract: An audio band processor and a method and circuit for controlling its gain. The audio band processor comprises a first variable gain amplifier for receiving an analog audio signal; an analog to digital converter for converting the analog audio signal to a digital audio signal; and an interface circuit for encoding the digital audio signal. The interface circuit also arranges the digital audio signal into a sequence of encoded transmit frames, and receives a sequence of encoded receive frames, each receive frame comprising a predetermined number of encoded digital audio signal data bits and a predetermined number of digital gain control bits. The interface circuit also adjusts a gain level of the first variable gain amplifier in response to the digital gain control bits. In another embodiment, the audio band processor further comprises a second variable gain amplifier, and the interface circuit adjusts a gain level of the second variable gain amplifier in response to the digital gain control bits.

公开(公告)号：CA2313219A1

公开(公告)日：1999-06-17

申请号：CA2313219

申请日：1998-12-14

Applicant: QUALCOMM INC

Inventor： HUTCHISON JAMES A ,  OLIVEIRA LOUIS D ,  HEIMBIGNER WADE L

IPC: G10L19/16 ,  H03M1/18

Abstract: An audio band processor and a method and circuit for controlling its gain. The audio band processor comprises a first variable gain amplifier (202) for receiving an analog audio signal; an analog to digital converter (204) for converting said analog audio signal to a digital audio signal; and an interface circuit (206) for encoding said digital audio signal. The interface circuit (206) also arranges said digital audio signal into a sequence of encoded transmit frames, and receives a sequence of encoded receive frames, each receive frame comprising a predetermined number of encoded digital audio signal data bits and a predetermined number of digital gain control bits. The interface circuit (206) also adjusts a gain level of said first variable gain amplifier in response to said digital gain control bits. In another embodiment, the audio band processor further comprises a second variable gain amplifier (202), and the interface circuit adjusts a gain level of said second variable gain amplifier in response to said digital gain control bits.

公开(公告)号：WO02069613A3

公开(公告)日：2003-05-22

申请号：PCT/US0205328

申请日：2002-02-22

Applicant: QUALCOMM INC

Inventor： OLIVEIRA LOUIS D ,  GUPTA SAMIR KUMAR ,  BAZARJANI SEYFOLLAH ,  SU WENJUN

IPC: H03G7/00 ,  H03M1/70 ,  H04M1/73 ,  H04M1/60

CPC classification number: H03G7/007 ,  H03M1/70

Abstract: A wireless communication device (100) may include a receiver (110), a memory (104), a digital-to-analog converter (128) an audio playback system (124) and other features. A dynamic range controller (130) selectively generates control signals to adjust, at least in part, the operational dynamic range of the digital to analog converter (128) for digital signals received by the receiver (110) or stored in the memory (104). The selection of dynamic range is based on identifying a characteristic. In one embodiment, the control signals are used to selectively operate the digital-to analog converter (128) at a particular dynamic range based on a sampling rate of a received digital audio signal.

Abstract translation: 无线通信设备（100）可以包括接收机（110），存储器（104），数模转换器（128）音频回放系统（124）和其他特征。 动态范围控制器（130）选择性地产生控制信号，以至少部分地调整用于由接收器（110）接收或存储在存储器（104）中的数字信号的数模转换器（128）的操作动态范围， 。 动态范围的选择基于识别特征。 在一个实施例中，控制信号用于基于所接收的数字音频信号的采样率在特定动态范围内有选择地操作数模转换器（128）。