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TEF6901A Datasheet(PDF) 11 Page - NXP Semiconductors |
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TEF6901A Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 107 page  TEF6901A_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 20 March 2008 11 of 107 NXP Semiconductors TEF6901A Integrated car radio In the weak signal processing block these signals are combined in specific ways and used for the generation of control signals for soft mute, stereo blend (SNC = stereo noise control) and HCC. Detector time constants of soft mute, HCC and SNC can be selected independently. In AM mode, soft mute and HCC are controlled by the average value of the level voltage. 7.26 Audio step interpolation The tone/volume blocks of source selector, volume/balance, bass/loudness, fader and output mute include the Audio Step Interpolation (ASI) function. This minimizes audible pops by smoothing the transitions in the audio signal during the switching of the controls. 7.27 Source selector The source selector selects one out of several input sources: • One internal stereo signal (AM/FM tuner) • Seven input pins allow many combinations of external sources by means of flexible input selection Three of the seven input pins can connect to: – 1 stereo signal with ground input for common mode rejection (CD) – 1 stereo signal and 1 mono signal Four more input pins can connect to: – 1 stereo signal (AUX) and 1 mono signal with common mode rejection or differential input (PHONE) – 1 stereo signal (AUX) and 2 mono signals (e.g. NAV and BEEP) – 2 stereo signals (AUX and AUX-2) – 1 stereo signal with common mode rejection (CD-2) and 1 mono signal (e.g. BEEP) – 1 stereo signal with differential input (CD-symmetrical) 7.28 VU-meter read The input audio level of external sources can read out via the I2C-bus. Audio level information is available on a logarithmic scale. In radio mode the AM or FM modulation index is available in the same way. 7.29 Volume and balance The volume/balance control is used for volume setting and also for balance adjustment. The control range of the volume/balance control is between +20 dB and −75 dB in steps of 1 dB. 7.30 CD compression Dynamic volume compression is available for external input sources. This option is generally used for audio from CD or other digital formats to reduce the very high dynamic range of these signals into a range suitable for the car environment. |
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