Circuit for obtaining an output signal having distributed freque

Details Circuit for obtaining an output signal having distributed freque Circuit for obtaining an output signal having distributed freque

1997-11-12

2000-09-12

Williams, Howard L.

Coded data generation or conversion

Analog to digital conversion followed by digital to analog...

341123, 84602, 381 63, H03M 100

Patent

active

061183946

ABSTRACT:
In a surround circuit, an audio signal or another analog signal is converted to a digital signal by an A/D conversion circuit (11) and stored in a memory (12). Subsequently, the digital signal read from the memory (12) is converted to an analog signal by a D/A conversion circuit (13). The memory (12) then functions as a delay circuit, and a delayed audio signal is obtained. By superimposing the obtained delay signal to the transmitted audio signal, a surround sound is obtained. Here, a sampling frequency of either one of the A/D conversion circuit (11) and the D/A conversion circuit (13) is changed with an elapse of time, which leads the sampling frequency of the A/D conversion circuit (11) to differ from that of the D/A conversion circuit (13), and the frequency of an output signal of the D/A conversion circuit (13) differs from that of the audio signal transmitted to the A/D conversion circuit (11). Consequently, a delay signal in which the frequency of the input audio signal is dispersed can be obtained.

REFERENCES:
patent: 3023277 (1962-02-01), Mathews
patent: 4035783 (1977-07-01), Mathewson
patent: 4370643 (1983-01-01), Kitamura
patent: 5308916 (1994-05-01), Murata et al.
patent: 5444784 (1995-08-01), Toyama
patent: 5469508 (1995-11-01), Vallier
patent: 5576709 (1996-11-01), Onaya

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