US4093820A
Expired / Lapsed
US
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Electronic echo generation equipment
Assignee: NIHON HAMMOND KK
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Filing: 1977-07-11
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Granted: 1978-06-06
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Expires: 1997-07-11
Abstract
Abstract An electronic sound generation system wherein an input signal is frequency modulated, and the modulated signal passes through a series of cascaded shift registers. Amplifiers are provided for compensation of insertion loss in each shift register stage, and a frequency modulation detector is utilized to produce the time-delayed output echo signal.
Inventors
- 👤 Shigeru Yamashita
- 👤 Kazuo Masaki
- 👤 Masashi Shibahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/08; G10K15/12; Y; Y10; Y10S; Y10S84/00; Y10S84/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
An electronic echo sound generation system having a direct path and a delay path, the delay path comprising: frequency modulation means for frequency modulating an input audio signal on a carrier and having an output; a plurality of analog shift registers operable to time delay the modulated signal, coupled in series at a first end from the output of the frequency modulation means; amplifier means coupled in series with the analog shift registers for compensating for the insertion losses of the analog shift registers; and frequency modulation detector means coupled from the second end of the series coupled analog shift registers for producing at an output an echo audio signal derived from the input audio signal.
Claim 2
Dependent Claim
116 words
An electronic echo sound generation system having a direct path and a delay path, the delay path comprising: frequency modulation means for frequency modulating an input audio signal on a carrier and having an output; a plurality of analog shift registers operable to time delay the modulated signal, coupled in series at a first end from the output of the frequency modulation means; amplifier means coupled in series with the analog shift registers for compensating for the insertion losses of the analog shift registers; and frequency modulation detector means coupled from the second end of the series coupled analog shift registers for producing at an output an echo audio signal derived from the input audio signal.
Claim 3
Dependent Claim
32 words
The system of claim 1 in which said amplifier means comprises an insertion loss compensation amplifier coupled between each pair of intercoupled analog shift registers of the plurality of analog shift registers.
Claim 4
Dependent Claim
15 words
The system of claim 1 in which the frequency modulation means comprises a serrasoid modulator.
Claim 5
Dependent Claim
16 words
The system of claim 3 in which the amplifier means comprises a limiter and a filter.
Claim 6
Dependent Claim
30 words
The system of claim 2 in which the frequency modulation means comprises a serrasoid modulator and in which each said insertion loss compensation amplifier includes a limiter and a filter.
References Cited (Backward Citations)
US3920905A
Cited
US3980828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |