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TDA9614H Datenblatt(PDF) 11 Page - NXP Semiconductors |
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TDA9614H Datenblatt(HTML) 11 Page - NXP Semiconductors |
11 / 60 page 1995 Mar 21 11 Philips Semiconductors Preliminary specification Audio processor for VHS hi-fi and linear audio TDA9614H 6.1.8 DECODER SELECT (DECODESEL) The line 2 output is normally connected to a decoder box or e.g. a second VCR (SCART2). Normally the audio signal from the output select will be available at this output, but three extra selections are shown in Table 3. Table 3 Extra decoder select possibilities Notes 1. Enables the use of a decoder box (connected to line 2 [EXT2]) by the VCR. 2. Decoder box connection to television set (See Section 6.1.7). 6.1.9 HEADPHONE SELECT (HPSEL) The headphone output will normally carry the output select signal, however three more selections are possible and shown in Table 4. Table 4 Extra headphone select possibilities Note 1. The selections LEFT and RIGHT make it possible to select a different language for the headphone as for the line outputs. A possible implementation is to invert always a language selection made at the output select. 6.1.10 HEADPHONE VOLUME The headphone volume control has a control range of +16 dB to −47 dB in 1 dB steps and a full mute. 6.1.11 DC SELECT (DCSEL) The VU meter output is normally connected to the headphone select, but can also be switched to STEREO (hi-fi stereo, before the output select). When using the VU meter output signal to implement a ‘digital AGC’ (read the level at the DC output, and adjust the VOLUME L/R controls accordingly) it is necessary to have information of SELECTION DESCRIPTION TUNER(1) audio from input TUNER EXT1(2) audio from input EXT1 EXT3 audio from input EXT3 SELECTION DESCRIPTION LEFT(1) left hi-fi channel RIGHT(1) right hi-fi channel NORMAL linear audio, useful for monitoring the recording by ‘audio dubbing’ both hi-fi audio channels, independent from the setting of output or headphone select. For this mode the selection STEREO can be made. 6.2 Linear audio circuits 6.2.1 RECORD/LOOP-THROUGH The signal selected with the normal select can be level controlled in the AGC block. If wanted this AGC can be switched off using bit AGCN. The audio signal is thereafter DC decoupled using a capacitor between pin 29 (LINOUT) and pin 28 (LININ). From here on the signal goes to the output select and (in the event of record mode) to the record equalizer. The record equalizer is a non-inverting amplifier with a gain of +12 dB, consisting of an opamp with feedback resistors, and acts as a pre-correction filter for the tape and head characteristics. The inverting input of the opamp is connected to pin 31 (RECEQ), its output to pin 33 (RECOUT). The circuit externally connected between pin 31 and ground defines the transfer of the record equalizer with equation: Where: Z is the complex impedance of the external circuit. Two equalizings can be used, switching additional circuitry to ground with pin 30 (EQSW) in long play or extended play (I2C-bus: LP = 1). Instead of the hi-fi circuit, linear audio has two loop-through modes: • Loop-through playback • Loop-through record. The only difference between Loop-through record and record is the RECOUT output, which is muted. The LINREC output (pin 32) is used to drive the external high-voltage switch and possibly the bias oscillator. The LINREC voltage has a small internal delay to be non-overlapping with the internal switching to playback mode. This ensures that no bias voltage will appear at the PBIN input while the IC is in playback mode. 6.2.2 PLAYBACK The signal coming from the head is amplified and can be level controlled in 16 steps of 1 dB. This setting can be used to adjust for spread or nominal difference in head output level. Afterwards, the signal is frequency corrected in the playback equalizer. This equalizer includes the two standard VHS equalizing settings of 3180 and 120 µs A 3.98 1200 Z + ( ) Z ------------------------------ × = |
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Ähnliche Beschreibung - TDA9614H |
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