M65845AFP 查看數據表（PDF） - Renesas Electronics

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M65845AFP

Digital Echo with Microphone Mixing Circuit

Renesas Electronics 

M65845AFP

4. Vocal cut

It is a method turned down Lch and Rch input having the same phase and sound.

Low pass cut off frequency fc is determined by a capacitance which connect to pin 36 (vocal cut filter).

It is also having a function which through frequency under vocal level for supplying a lack of low level sound.

RVC = 20 kΩ (Typ)

36

C34

fc =

1

2π • RVC • C34

at fc = 50 Hz, C34 = 0.15 μF is determined.

Caution: Inside resistance is changeable one by one which rate is ±30%.

Digital Echo

1. Clock oscillator circuit

This IC incorporates a current control type clock oscillator circuit in it, thus providing circuit configuration just by

connecting an RC for current control pin 32 (CLOCK CONT).

Fully internal clock supply prevents occurrence of undesired radiation without affecting any external circuit.

The oscillator frequency fck is following.

fck = 2 MHz (RC = 51 kΩ)

DC current

RC

32

Clock

oscillator

circuit

Clock frequency: fck

Note: The delay time (Td) for echo is determined by the clock frequency (fck).

Delay time = 1/fck × 24 × N

(N = the number of memory bits = 16384)

fck = 2 MHz (Rc = 51 kΩ): Delay time = 197 ms

fck = 2.6 MHz (Rc = 39 kΩ): Delay time = 150 ms

fck = 3.9 MHz (Rc = 24 kΩ): Delay time = 100 ms

REJ03F0170-0201 Rev.2.01 Jan 25, 2008

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