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TEF6894H Datasheet(PDF) 10 Page - NXP Semiconductors |
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TEF6894H Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 55 page  2003 Oct 21 10 Philips Semiconductors Product specification Car radio integrated signal processor TEF6894H 7.6 Tone/volume control The tone/volume control part consists of the following stages: • Input selector • Loudness control • Volume/balance control with muting • Treble control • Bass control • Fader and output mute • Beep generator • NAV input • Output mixer. The settings of all stages are controlled via the I2C-bus. The stages input selector, loudness, volume/balance, bass, and fader/output mute include the Audio Step Interpolation (ASI) function. This minimizes pops by smoothing the transitions in the audio signal during the switching of the controls. The transition time of the ASI function is programmable by I2C-bus in four steps. 7.6.1 INPUT SELECTOR The input selector selects one of four input sources: • Two external stereo inputs (CD and TAPE) • One external mono input (PHONE) • One internal stereo input (AM/FM). 7.6.2 LOUDNESS The output of the input selector is fed into the loudness circuit. Four different loudness curves can be selected via the I2C-bus. The control range is between 0 and −20 dB with a step size of 1 dB; see Figs 16 to 19. 7.6.3 VOLUME/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 and −59 dB in steps of 1 dB. The combination of loudness and volume/balance realizes an overall control range of +20 to −79 dB. 7.6.4 TREBLE The signal is then fed to the treble control stage. The control range is between +14 and −14 dB in steps of 2 dB. Figure 20 shows the control characteristic. Four different filter frequencies can be selected. 7.6.5 BASS The characteristic of the bass attenuation curves can be set to shelve or band-pass. Four different frequencies can be selected as centre frequency of the band-pass curve. Figures 21 and 22 show the bass curves with a band-pass filter frequency of 60 Hz. The control range is between +14 and −14 dB in steps of 2 dB. 7.6.6 FADER/MUTE The four fader/mute blocks are located at the end of the tone/volume chain. The control range of these attenuators is 0 to −59 dB. The step size is: • 1 dB between 0 and −15 dB • 2.5 dB between −15 and −45 dB • 3 dB between −45 and −51 dB • 4 dB between −51 and −59 dB. 7.6.7 BEEP GENERATOR AND NAV INPUT WITH OUTPUT MIXER The output mixer circuit can add an additional audio signal to any of the four outputs together with the main signal or instead of the main signal. The additional signal can be generated internally by the beep generator with four different audio frequencies or applied to the NAV input, for instance a navigation voice signal. |
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