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| HD64F2215TE16资料 | |
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HD64F2215TE16 PDF Download |
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File Size : 116 KB
Manufacturer:RENESAS Description: A PCM CodecCFilter is used for digitizing and reconstruct- ing the human voice. These devices are used primarily for the telephone network to facilitate voice switching and trans- mission. Once the voice is digitized, it may be switched by digital switching methods or transmitted long distance (T1, microwave, satellites, etc.) without degradation. The name codec is an acronym from COder for the analogCtoCdigital converter (ADC) used to digitize voice, and DECoder for the digitalCtoCanalog converter (DAC) used for reconstruct- ing voice. A codec is a single device that does both the ADC and DAC conversions. To digitize intelligible voice requires a signalCtoCdistortion ratio of about 30 dB over a dynamic range of about 40 dB. This may be accomplished with a linear 13Cbit ADC and DAC, but will far exceed the required signalCtoCdistortion ratio at larger amplitudes than 40 dB below the peak ampli- tude. This excess performance is at the expense of data per sample. Two methods of data reduction are implemented by compressing the 13Cbit linear scheme to companded pseudoClogarithmic 8Cbit schemes. The two companding schemes are: MuC255 Law, primarily in North America and Japan; and ACLaw, primarily used in Europe. These com- panding schemes are accepted world wide. These compand- ing schemes follow a segmented or piecewiseClinear curve formatted as sign bit, three chord bits, and four step bits. For a given chord, all sixteen of the steps have the same voltage weighting. As the voltage of the analog input increases, the four step bits increment and carry to the three chord bits |
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| 1PCS | 100PCS | 1K | 10K | ||
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型 号：HD64F2215TE16 厂 家：RENESAS 封 装：QFP 批 号：07+ 数 量：1200 说 明：绝对原装深圳现货/底价 |
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运 费： 所在地： 新旧程度： |
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| 联系人：龙先生,胡小姐 |
| 电 话：0755-83226907,83229025,83226903 |
| 手 机：13927436669 |
| QQ：1109170345,514620629 |
| MSN：hlh1999@msn.com |
| 传 真：0755-83226930 |
| EMail：sale@cdf-ic.com |
| 公司地址： 深圳市福田区中航路新亚洲电子商城国利大厦710室. |
