- 您现在的位置：买卖IC网 > PDF目录98158 > TAS3004PFBRG4 (TEXAS INSTRUMENTS INC) SPECIALTY CONSUMER CIRCUIT, PQFP48 PDF资料下载
参数资料
| 型号： | TAS3004PFBRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封装： | GREEN, PLASTIC, TQFP-48 |
| 文件页数： | 28/84页 |
| 文件大小： | 671K |
| 代理商： | TAS3004PFBRG4 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页当前第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页
4–5
4.9
Dynamic Loudness Contour
The necessity for applying loudness compensation to playback systems to compensate for the fact that the ear
perceives bass and treble less audibly at low levels than at high ones has been established with the first data
published by Fletcher and Munson in 1933.
There are many equal-loudness contours in publication, like Steven’s contours, Robinson and Dadson contours even
reached the acceptance level of ISO recommendation.
The TAS3004 device has a simplified loudness contour algorithm that diminishes the effect of weak bass at low
listening levels. Since contour has volume level dependency, the user must define the relation between the gain of
the contour circuit and the volume level.
Figure 4–3 is a block diagram of this circuit.
Volume
Biquad
Gain
Figure 4–3. Block Diagram
The loudness contour is activated by sending an activation command via I2C from an external device. Optionally, a
contour gain command can be sent by an external device to provide tracking with the system’s volume control.
4.9.1
Loudness Biquads
Loudness biquad filters for the left and right channels are independently programmable via I2C. Their subaddresses
are 0x21 and 0x22, respectively. The digital filters are written as five 24-bit (4.20) hex coefficients for each channel.
4.9.2
Loudness Gain
Loudness gain values for the left and right channels are independently programmable via I2C. Their subaddresses
are 0x23 and 0x24, respectively. The gain values are written as one 4.20 hex coefficient for each channel.
4.9.3
Loudness Contour Operation
When the frequency of the loudness contour is determined, a digital filter must be developed. Then, the gain of the
filter is determined. These values are placed in the storage area of the system controller (microcontroller) and sent
to the TAS3004 device when it is desired to activate the loudness contour.
If it is necessary to change the frequency or gain of the contour, new gain and filter coefficients are sent by the system
controller. This function is performed normally when the volume control is changed (that is, more volume, less
contour). The gain of the loudness contour filter then tracks the volume control.
The loudness contour biquad filters are provided in addition to the seven equalization biquad filters.
See Section A.6 for programming instructions.
相关PDF资料 |
PDF描述 |
|---|---|
| TAS3103DBT | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103IDBT | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103DBTRG4 | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103DBTR | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103IDBTRG4 | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS3103 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Digital Audio Processor With 3D Effects |
| TAS3103A | 制造商:TI 制造商全称:Texas Instruments 功能描述:Digital Audio Processor With 3D Effects |
| TAS3103ADBT | 功能描述:音频 DSP Digital Audio Processor w/ 3D Eff RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS3103ADBTG4 | 功能描述:音频 DSP Digital Audio Processor w/ 3D Eff RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS3103ADBTR | 功能描述:音频 DSP Digital Audio Processor w/ 3D Eff RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。