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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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STA680 Datasheet(PDF) 8 Page - STMicroelectronics |
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STA680 Datasheet(HTML) 8 Page - STMicroelectronics |
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8 / 43 page  System overview STA680 8/43 2.1 HD Radio processing The STA680 HD Radio Decoder does the processing of the IBOC signal. It receives a complex digital signal from an AM/FM IF channel signal processor. The native sample rate is 744.1875 kS/s for FM and 46.51171875 kS/s for AM. However, other input sample rates are acceptable because of the sample rate converter in the base-band Interface (BBI). These include: 650 kS/s, 675 kS/s, 882 kS/s and 912 kS/s. If a base-band signal is provided that is not at the native sample frequency of 744.1875 kHz it must be sample rate converted to this rate. Sample rate conversion hardware is provided on-chip to support this. This feature allows the STA680 to operate with various AM/FM front-ends. The STA680is then responsible for detection, acquisition, and demodulation of the IBOC signal. Such function is primarily implemented by the Vectra DSP core. The demodulated signal is then passes to the Hi-Fi processor, for decoding, audio blending and handling of data services. A digital 44.1 kHz decompressed audio is output via the Digital Audio Interface. The STA680 uses sophisticated algorithms to recover IBOC data even in the presence of signal impairments including fading and a variety of other interferences. To process the HD Radio stream STA680 requires a 4Mx16 external SDRAM (with up to 32Mx16 supported) for data storage. 2.2 Dual stream HD Radio processing STA680 is capable to simultaneously demodulate two different HD Radio streams. This unique feature enables the device to decode an HD Radio audio stream, in parallel with any data service broadcasted by a different radio channel. The implementation of the dual stream HD Radio processing requires that two AM/FM RF tuners are connected to the STA680. In a single channel implementation a single RF tuner is used. In such configuration STA680 is able to demodulate at the same time both the audio and the data associated with the radio channel (i.e. 92.5 MHz or 102.5 MHz). This means that if the user sets the tuner 102.5 MHz, he or she can listed to FM2 audio and receive traffic information broadcasted on that channel. At the same time if the user tunes to another frequency (FM1), current traffic information will be lost. Figure 3. Single channel application FM1 Audio FM1 News FM 1 FM1 Audio FM1 News FM 1 FM2 Audio FM2 Traffic FM 2 FM2 Audio FM2 Traffic FM 2 92.5 102.5 MHz FM1 News FM1 Audio FM1 News FM1 Audio FM2 Traffic FM2 Audio FM2 Traffic FM2 Audio OR Data received are bound to the selected Audio channel |
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