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    • 9. 发明授权
    • Method and apparatus for combining a wireless receiver and a non-wireless receiver
    • 用于组合无线接收机和非无线接收机的方法和装置
    • US06717533B2
    • 2004-04-06
    • US09872270
    • 2001-05-31
    • Charles Eric SeabergGregory J. BuchwaldAzfar Inayatullah
    • Charles Eric SeabergGregory J. BuchwaldAzfar Inayatullah
    • H03M700
    • H04B1/006H04B1/0003H04B1/005H04B1/28H04R5/02
    • A vehicular audio system receives audio inputs from audio sources and a radio receiver. Analog audio is converted to digital, and digital audio remains natural digital. The receiver front end converts a radio signal to an intermediate frequency then an ADC converts that to a digital signal. The inputs that are converted to digital are selectively mixed with each other and with the natural digital signals. This allows for sounds from multiple sources to be heard simultaneously so that a telephone ring may be provided without requiring background music to be interrupted and for uses such as voice by microphone over a music tape. A reference frequency to the receiver front end of 7.2 MHz is particularly beneficial for noise reduction and consequent mixing of digital audio at 48 KHz, the standard frequency for typical digital audio inputs.
    • 车载音频系统从音频源和无线电接收器接收音频输入。 模拟音频转换为数字音频,数字音频保持自然数字。 接收器前端将无线电信号转换为中频,然后ADC将其转换为数字信号。 转换为数字的输入选择性地与自然数字信号相互混合。 这允许同时听到来自多个源的声音,使得可以提供电话环而不需要中断背景音乐,并且可以通过音乐磁带来使用诸如麦克风的语音。 7.2 MHz的接收机前端的参考频率对于降噪和随后混合48 KHz的数字音频(典型数字音频输入的标准频率)特别有利。