Sound mixer with band separation

• US 5,237,619 A
• Filed: 07/11/1991
• Issued: 08/17/1993
• Est. Priority Date: 07/13/1990
• Status: Expired due to Fees

• Current Assignee: Flaminio Frassinetti
• Original Assignee: Flaminio Frassinetti
• Inventors: Frassinetti, Flaminio
• Primary Examiner(s): Ng, Jin F.
• Assistant Examiner(s): TONG, NINA C
• Application Number:
  US07/728,648
• Time in Patent Office: 768 Days
• Field of Search: 381/119, 381/118, 381/120, 381/100, 381/28, 381/81, 381/82, 381/85
• US Class Current: 381/119
• CPC Class Codes: H04H 60/04 Studio equipment; Interconnection of studios

Abstract

In a mixer there is a plurality of preamplifiers followed by a plurality of tone control groups connected to a plurality of voltage followers to which a series of active filters is connected, for selecting frequency bands of signals. Then a plurality of adders is connected to the seried of filters for mixing the signals in each frequency band selected by the filters and for sending the mixed signal to a plurality of line amplifiers and final amplifiers, with which loudspeakers are connected. The preamplifiers, the tone control groups, the voltage followers, the series of filters, the adders, the line and power amplifiers and the loudspeakers are connected so as to form a plurality of circuits, all of them equal to each other.

Claims

1. Sound mixer with band separation, having at least two input channels, each input channel including its own transducer for supplying electric signals corresponding to sounds coming from a separate sound source associated with a said transducer,

said mixer comprising:

a group of the same number n (where n is a whole number equal to or greater than

     2) of filters connected to the transducer of each input channel covering the audio spectrum range of the signals received by the transducer of the channel, each filter of each group having a selected and different bandpass characteristic;

n adders, each adder connected to and receiving only the output of the filter of each filter group having the same bandpass characteristic; and

means for amplifying and reproducing the output signal of each adder.

2. A sound mixer as in claim 1 wherein said amplifying and reproducing means comprise amplifying means connected to said adder means and a loudspeaker connected to said amplifying means.

3. A sound mixer as in claim 1 further comprising a preamplifier and tone control means connected between each transducer and its connected filter group.

4. A sound mixer as in claim 3 further comprising a voltage follower connected between a said tone control means and its connected filter group.

6. A sound mixer as in claim 2 further comprising a preamplifier and tone control means connected between each transducer and its connected filter group.

7. A sound mixer as in claim 6 further comprising a voltage follower connected between a said tone control means and its connected filter group.

8. A sound mixer as in claim 2 when said amplifying and reproducing means comprise amplifying means connected to said adder means and a loudspeaker connected to said amplifying means.

5. Sound mixer with bank separation for stereo applications, having at least two input channels both concerned with the same sound source, each input channel including a transducer for supplying electric signals corresponding to sounds coming from said same sound source,

said mixer comprising:

a group of the same number n (where n is a whole number equal to or greater than

     2) of filters connected to the transducer of each input channel, each group covering the audio spectrum range of the signals supplied by its connected transducer and each filter of a respective group having a selected bandpass characteristic;

n adders, each adder connected to and receiving only the output of the filter of each group of filters having the same bandpass characteristic; and

means for amplifying and reproducing the output signal of each adder.